<!-- Title: 08:38:27  Fri Aug 20 2004 -->
<!-- Crewchief: Phil Schlabach -->
<!-- Op1: Dale Stentz -->
<!-- Op2: Ingyin Zaw -->
<!-- Op3: Muge Karagoz Unel -->
<!-- Op4: Sal Rappoccio -->
<!-- Op5: <i>NWU student</i> -->
<!-- Op6: <i>Harvard student</i> -->
<!-- Notes: -->
<h3>2004 August shutdown begins August 23, ends ~December 3.</h3>


<!-- Date: Fri Aug 20 08:45:11 2004 -->
Soon to be out of date 2004 August shutdown webpage for CMX can be found <a href= 'http://www-cdf.fnal.gov/internal/people/links/DaleStentz/shutdown/shutdown04.html' target=_blank>here</a>. 
<br> 
<br> 
Final preperation are under way.  T-minus ~3 days.
<!-- Author: Dale -->
<!-- Comment: Mon Aug 23 08;47;13 comment by...Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=629&frame=2&anchor=07:35:46.164'>
The day of reckoning has come.</a>


<!-- Date: Mon Aug 23 12:24:45 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-317&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-318  width='300' align='top'></a></td><td>CMX wedge 6 - 7 (keystone to SW arch) overlap patch pannel</td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Mon Aug 23 13;00;00 comment by...Dale, Ingyin -->
Time is still on our side by were off to a rocky start:
<p>
First the good news: signal board W-7-00 [lower right highlighted preamp board] already has anode HV and its two physical arch 7 chambers have cathode.  In principle just need to test out the other two chambers (on the keystone) and put the signal cable in.  Haven't test yet but are confidence is still high on this part.  However, there is something that we forgot to plan for (it shouldn't hurt us though) - there are no open cathode connection points (the only one would be be at the other end of the wedge).  Thus we need to get fancy: take the "supply" cathode HV and extend it via a ~ 5 ft SHV (then to jumper) to the bottom two chambers above; on the return we convert back to another SHV cable of the same length and go into the normal cathode HV spicket.  Therefore, this plan requires one additional SHV cable but otherwise is as simple as before.
</p>
<p>
Now wedge 7 only has 3 chambers that we can pick up as one chamber physically doesn't exist.  Shortly after testing the cathode we discovered that black plastic guide for the HV jumpers had come off ("unglued"?).  As this is the last chamber this doesn't hurt us.  This piece will likely not be put back on as we can live without it.  The cathode seems to work fine under short testing but the anode is cause for concern.  The board pictured top left above sparks (trips) on the anode.  It consistently sparks (according to Dale's eyes) at the brown 5.1 MOhm - more precisely underneath the board at this point.  The problem is believed to be due to grounding to steel support that holds the board up (i.e. near the two open circles on the bottom left of the top board which represent the two white screws that hold the board in place).  The the problem is as reported and the screws are long enough it may be possible to simply insert an "insulator" in between and see if this solves the problem.
</p>
In other news, the keystone is not off by much in "z".  Compared to the SW arch the chambers are pratically flush.  It is noted that if one looks at the far end (higher in y, smaller in z) there does appear to be a slight tilt between chambers.  But nothing on the on the order of 10 cm.

<!-- Comment: Mon Aug 23 17;45;08 comment by...Dale and Ingyin -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=631&frame=2&anchor=17:44:04.019'>
We're making progress.</a>  More details to follow.

<!-- Comment: Tue Aug 24 12;37;12 comment by...Dale and Ingyin -->
Update:
<p>
We were able to setup the cathode HV jumpers as desired.  Thus, wedge 6 has a jumper to SHV to jumper to connect the two separate chambers.  For wedge 7 we extended the SHV cable to go into its two  separate chambers first then back to the rest of the wedge via the socket.
</p><p>
The sparking/tripping anode on wedge 6 was fixed (or it went away) after we applied 2 coats of red corona dope plus an additional layer of kapton tape on the Al (or is it steel?) support which holds up the preamp.  The anode holds HV fine - no current spikes etc.  We had the HV hooked up to the wedge as normal and it held from 17:30 - to about <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=632&frame=2&anchor=08:51:01.098'>
9:00</a> today.  We tested it at (5.6, 3.0) kV and it held with currents (.6 uA, .4 mA) or (.3 uA, .405 mA) under normal voltages via iFIX.</p>
<p>
Note that the NW miniskirt has been on since 9:30 Monday.  We continue to test it.
</p>
More details on wedge 6-7 overlap to come...


<!-- Date: Tue Aug 24 12:54:35 2004 -->
<pre>Other random but important stuff: 
 
We put the blue steel protection covers on the bottom of the arches.  We will inquire about the miniskirt self-protection before the plug is pulled.  It may be that ops wants to do this after the plug it pulled. 
 
We also fixed the eye-sore that was all the cables (mainly LV) that were hanging down from wedge 5 of the keystone.  Jamie was kind enought to point this out and it was simple enough to do.  The major consern was ofcourse when the BMU steel closed if anything would get caught / pinched, etc.</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Wed Aug 25 09;10;36 comment by...Dale and Ingyin -->
<p>The other major piece of work was installing long SHV cables to allow the (SW) arch to be pulled.  We are confident that the arch can be moved, however <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=632&frame=2&anchor=08:51:01.098'>
it be best if we were there when it would be moved</a>.  The major thing is that we want the SHV cables to loosely hang from the other cables the bridge the gap.  Bottom line is that we have the HV in the configuration that we want which includes 7 new chambers (4 from wedge 7, 3 from wedge 6).  So far this area has not triped since we insulated board 6-11.  Techically, we didn't even directly test the new addition to wedge 7 since two chambers were already powered (didn't have its LV cable pluged in) - it was easy enough to the whole of wedge 7 on the fly.</p>
<p>
After cleaning up wedge 5 we turned to look at the outer 4 chambers of the 2nd stack of wedge 4 [or west board 4-03].  The horror of what we saw can barely be described.  Recall that the HV normally feeds into the wedge at the second stack (i.e. stack 1 [of 0-5]).  As is the case here, the HV sometime "starts" here so that the first stack of wedge 4 is actually powered/connected to wedge 4.  This [chambers that make up board 4-03] HV appears to be hooked up normally but both anode HV and cathode are evidently by-pass.  Indeed, two SHV to jumper had been use to take the drift (anode) to stack 1-wire 3 (board 4-02) and beyond.     This system makes sense as it's the only way to get HV to the inner part of the wedge.   However, the drift would normally go on the to the wires like this skeem: [7, 5], 3, 1, 0, 2, [4, 6] where the [X] represent chambers that are by-passed.  Rather then use a long jumper, a old face plate was used to extened the jumpers.  The green plate (its broken in two - using the half with the jumper connection) naturally alowing the next stack to jump to the last un-by-passed chamber is a very CMX like solution.  In particular, the board is wraped in kapton tape and clearly has been covered with red corna dope in certain areas.  Since this area works it is hard to critizise it.  However, we thought it best to disclose this information for any one else who may look at the 4 dead channels in wedge 4 stack 1 in the future.
</p><p>
We took a look at the area several times.  Because of the blue steel and the position of the board we decided aginst trying to test / recover any of the chambers.  If it was the miniskirt, we would just take the preamp board out first, re-configure, and test the 4 chambers on the cathode first.  As it will very hard to get the board out (for example hard to get at the grounding leg and anode signal wire for the chamber under the steel also hard to unscrew the board - one has to do so blindly) this makes any other access hard to get at.  And of course, we don't know what the problem is - only that at least one of the chambers must have started to trip and required a quick solution that had not been re-investigated until now.  
</p>
<p>
With wedge 4's 4 chambers not showing any hope we decided to work on wedge 5 and see what we could get to work.  Surprizely, we were able to get the first 5 degrees to work (techical note: the first stack is half missing - the 4 wires farthest north).  We also note that, as we saw when working on the new chambers for wedge 6 that trips will occur with out the dirft chambers being powered up 1 to 1 with the anode wire.  By this we mean if you hooked up 8 chambers to the cathode but only 4 to the anode, the system would trip (on the cathode no less).  Long story short, this area is working and we even went ahead and hooked up the HV with wedge 4.  We did this using the pre-existing cathode resistor box and an SHV "T" for the anode.  Of course, we found that the SHV cable that would travel to wedge 5 only had labels on the keystone edge.  A quick continuity check later, we had use our special "brand" of lables.  Thus, we put Black electical tape on both ends of the drift/cathode and tan/transpartent kapton tape on the anode.
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=633&frame=2&anchor=17:32:19.767'>
Turned on combined wedge 4+first 5 degrees of wedge 5</a> and its has been holding.  The anode draws about 1.2 uA while the cathode draws a nice .400 mA.
</p>

<!-- Comment: Wed Aug 25 09;13;39 comment by...Dale -->
<pre>sorry for the typo's, etc. I pasted the "bad" version - very odd...

</pre>


<!-- Date: Wed Aug 25 12:28:28 2004 -->
Update: 
<p> 
Nothing has tripped since we hooked things up to run with iFIX + the CAEN.  Current values are where they should be, etc.  We <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=634&frame=2&anchor=09:21:07.553'> 
turned everything off</a> before starting work.  This includes the NW miniskirt.</p> 
<p> 
Current work focuses on wedge 5 (keystone).  We are working on stack 2 - the stack labeled "BAD" on the face plate attachment edge.   We think we have found 1 chamber which is bad (trips repetitively ~1 to 2 kV - depending on the number of hooked up chambers.  We will likely by-pass this chamber and continue on.  We'll document this later but "to be by-pass" chamber is in stack 2, wire 0 [the bottom (inner) chamber]. 
</p> 
<p> 
We talked with Dervin and Rob and explained that we thought the SW arch could be pulled safely but that we wanted to be around when it was pulled and watch as its done.  For sure, this will be done on Monday in preparation for pulling the west side plug - although Dervin may have had another reason to pull it sooner.  In any case, we plan to be there and make sure we got things as we want them.  The major thing is of course hanging the SHV cables so that the arch can close without issue. 
</p> 
We forgot to note that the new set of chambers do not have there ground connected to the [7-00] preamp's ground (the reason is that if the arch is pulled these won't reach more than a few cm).  The new chambers and its preamp board for wedge 6 [6-11] seem to only have one ground.  It seems that one can see how this could cause a problem but then again the boards are grounded as are the chambers.  For now this is not a problem although we should make sure the grounding legs to go anywhere where their not suppose to.
<!-- Author: Dale and Ingyin -->
<!-- Comment: Wed Aug 25 12;53;10 comment by...Dale -->
<pre>Slight change in plans - Rob needs us tell him we are done (for tonight) so that they can close the west toroid for the survey crew tommarow (8/26).  Likely that it will remain closed up for all of Thursday.  If we can we may go have a look at the SE miniskirt and then work hard Friday morning (when the west opens up again).  We will likely ask to have permission to keep our keys through the weekend.</pre>

<!-- Comment: Wed Aug 25 17;01;37 comment by...Dale and Ingyin -->
<pre>Here are the current values for wedges that we're testing; detail to follow...

 West    I_drift   I_anode
Wedge#    (mA)     (microA)
4-5       .533       .5
6         .405       .5
7-8       .877       1.0</pre>

<!-- Comment: Wed Aug 25 21;40;27 comment by...Dale and Ingyin -->
<p>
Wedges 6 and 7 are unchanged; however, we added another 2 stacks to wedge 5.  This brings the total up to 4 stacks or 27 chambers [recall that stack 0 (5) is missing its lower (higher) phi chambers, thus 4 + 8 + 7 + 8].  We did in fact by-pass the stack 2 - wire 0 chamber - it trips easily on the cathode.  Note that the 2 newest stacks (2 and 3) is a bit spiky in the anode but the current draw is ok and seems to 'relax' over time.  The cathode for 2 of the stacks does spike (note that when in series with the whole wedge this is a small effect 20 microA vs. ~ 400.  As seen many times before, once the anode HV is applied the drift/cathode stabilizes right away and is solid.
</p><p>
We are working on stack 4 (of wedge 5) and had to end there today.  We have another tripping wedge on the outer (4-7) wires of this stack (board 5-09).  The area trips around or just after reaching nominal voltage.  The inner wires hold voltage on both cathode and anode but the current does spike.  In this regard we need to be "careful" and make sure to remove trouble making chambers, etc.  Not and chance in hell that we could find and fix a bad chamber during a 1-2 hour control access if something would go bad.  The searches take too long; we have to divide a stack by the board first which takes extra time to arrange jumpers, etc.
</p>
Things have been holding voltage since we brought things up [<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=635&frame=2&anchor=16:55:39.796'>link</a>].


<!-- Date: Thu Aug 26 08:57:37 2004 -->
<p> 
I saw this before but now its official, wedge 7 must have a blown LV fuse.  Check run <a href='http://www-cdfonline.fnal.gov/java/cdfdb/servlet/RunSummary?RUN_NUMBER=186667'>186667</a> where we had all of the HV on in all of the SW (<a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=635&frame=2&anchor=21:59:18.810'>as requested in the elog</a>). 
</p> 
On the subject of LV, we know that wedge 5 has none.  Ingyin checked this out and Dale thinks he sees that there are not any fuses (i.e. no srews that hold the fuses in) in the box attached to the most NW keystone (brown steel) support.  As for wedge 7, we worry about the floating grounding tabs - although I think the actual proablity for this being the case is low.  I like to get wedge 7 figured out quickly as this is the only thing holding us back.  For wedge 5 this can wait, 5 of the 12 signal cables don't have working ground tabs, there is no ASD board, and we haven't changed out the radekas yet.
<!-- Author: Dale -->


<!-- Date: Thu Aug 26 09:20:33 2004 -->
<p>I decided to bring up HV on the SW miniskirt while I checked the location of the exotics meeting via the Muon3 PC.  When I clicked away IE, I saw that wedge "16" had triped.  <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=636&frame=2&anchor=09:11:36.736'> 
I ramped it up a couple of times</a> but it would trip on the drift, ~2kV.  <b>Note:</b> west toroid is in for survey work (we cannot get to it).  I'll wait a bit and check it out later. 
</p>
<!-- Author: Dale -->
<!-- Comment: Thu Aug 26 11;13;00 comment by...Dale -->
Compare with <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=6&frame=2&anchor=13:54:19'>
before</a>.
<!-- Comment: Thu Aug 26 11;24;09 comment by...Ingyin -->
<pre>I turned both SW miniskirts back on. They are holding HV for now.</pre>
<!-- Comment: Thu Aug 26 22;23;44 comment by...Dale -->
Triped again, <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=637&frame=2&anchor=18:08:56.939'>
see shift elog</a>.  
<br><br>
Hopefully we get it to bite tommarow.

<!-- Date: Thu Aug 26 10:15:40 2004 -->
Foolish me for trying to get to a meeting...<br> 
<br> 
I bumped into T.J. LeCompte and we talked about the high CMX trigger 
rate at high luminosity (the growth term is too large - eats up too 
much bandwidth relative to what it uses at low luminosity).&nbsp; He 
discussed that of course tracks/XFT would be driven up but the scaling 
doesn't match with the equivalent CMU trigger (a priori both would grow 
if this was the only factor).<br> 
<br> 
Things to look at:<br> 
<ul> 
<li>raw CMX occupancy: what is the luminosity dependence and, for 
example, does one see higher occupancy in wedge around the "x-axis" 
relative to the miniskirt or keystone (higher currents and beam related 
trips in the "outer" CMX while keystone and miniskirt are perhaps much 
cleaner)</li> 
</ul> 
<ul> 
<li>CSX occupancy:&nbsp; better yet look at the counter rates 
themselves (via acnet - <a 
href="/cgi/elog/det-system-elog.pl?nb=cmx&amp;action=view&amp;page=6&amp;frame=2&amp;anchor=15:43:47">see 
here</a>)<br> 
</li> 
</ul> 
<ul> 
<li>stub occupancy: TJL wondered if there was some TDC primitive 
information that we could look at.&nbsp; <br> 
</li> 
</ul> 
<ul> 
<li>objectMon muons type + other "muon monitors": is there an obvious 
change in this distribution at high luminosity (lots of type 4 muons, 
etc.?)&nbsp; Note that this is a long shot as what passes the trigger 
is good and the rate at L3 is fine, etc.</li> 
</ul> 
We'll take a look and pass our findings on.&nbsp; Tom was also going to 
inquire to the L1/L2 guys - perhaps there are scalers to look at which 
can help explain what going on.&nbsp; This will give us something to do 
when there is not A/E gas next week.
<!-- Author: Dale -->




<!-- Date: Thu Aug 26 14:34:28 2004 -->
<p> 
We switched the signal cables for the SE miniskirt (wedge "16").  Board #s are off by 2, e.g. 16-00 to 16-02, 16-01 to 16-03, 16-06 to 16-04, etc.  Basically, the middle 5 degrees of the physical wedge is inside out.  We will look at the signals via scope and see what signals we see or don't see.  This test will telll us if the signal cables are ok and if the problem still exist for the SE miniskirt (I'll put a link in later).  Saw a friendly mouse.  I asked him if we been eating our signal cables but we wasn't in a talkative mood. 
</p>
<!-- Author: Dale, Ingyin, Mr. Mouse -->
<!-- Comment: Thu Aug 26 14;52;30 comment by...Dale and Ingyin -->
<br><br>By the way, we checked the signal cables and the LV for wedge "16".  Everything checked out, LV was getting to the boards and nothing looked "bad" - no grease or obvious damange.  Now we are checking signals via the TDC crate.

<!-- Comment: Thu Aug 26 15;23;36 comment by...Dale and Ingyin -->
<br><br><a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=6&frame=2&anchor=20:32:47'>
Here is the link.</a>   The problem follows the signal cables.  We reconstruct the exact situation in the preceeding link, where TDC# 12-23 are "weak" - occasional signal but about an order of magnitude slower in frequency.


<!-- Comment: Thu Aug 26 22;19;43 comment by...Dale and Ingyin -->
Upate / Summary:
<p>We looked at the preamp boards directly with the scope.  Board SE 16-00, 16-01, and 16-06 all have "healthy" signals with a relatively fast frequency.  However, we see the exact correspondence with what looking at the TDC told us.  Namely that there are 12 consecutive cambers that have no signals (dead) or "very weak" (an occasional signal).  In addition, we found that 4 chambers were just weak (the frequency was clearly diminished but consistent signals are present).  The 4 chambers are the left side of stack 1 (wires 0, 2, 4, 6), and the next 12 chambers are the rest of stack 1 and all of stack 2.  If one looks at the above link, the YMON clearly shows the alternating behavior of weak vs dead in the first stack and the next stack as all dead.
</p>
<p>
The next thing we did was change a good radeka (from board 16-00) in placed it in 3 easy access spots (the "bottom" board channel) which all had channels that were dead.  The result: those channels are still dead (the radekas didn't go bad).
</p>
<p>
At this point one begins to worry...   One observation which is important to note is that at least part of board 16-03 has signs of corrosion.  We have some bad boards outside; when George Ott saw them he thought of water corroding the board.  However, the other boards look fine (from what we can see).  In addition, a possible concern on one board doesn't explain why others at higher phi are bad.  There is a water tube that goes to those white drums that hang above the miniskirt.   There doesn't appear to be any signs of leakage but we can necessarily rule it out.  More to the point, the boards look relatively clean and there is no sign of grease, etc.  For example, the covers still have a bit of a shine to them and are not greasy to the touch.  We also checked the continuity of part of the path the signals take on the preamp board.  The 22+22 Ohm resistors work fine.  We also note that there is ok clearance between the cover and the preamp boards - its also still sturdy and shows no signs of being stepped on.
</p>
<p>
Clearly, one likely possibility is the gas is not flowing.  As each 5 degree section has its own gas flow this is certainly a logical possibility.  We don't know the mapping for the gas (well we know "1/2" of it) but the gas often starts at a corner (upper far left for example) and then follows a path similar to how the cathode jumpers are laid out (wires 0, 2, 4, 6, 7, ...).  The worse case scenario is that there might be a leak.  We looked and saw that 3 of the 6 flow meters were showing no noticeable flow.  We don't know the order (not to hard to figure out) but this possibility is not ruled out by one of the two most obvious configurations of the gas.  Note that the clear tube part of the gas lines (the weakest structurally) looks fine and has no signs of leakage, etc.  We will inquire to Del about what can be done to test these gas lines (we wanted to check the real flow rates anyway).  As we have N2 next week it might be a good time to check the flows or better yet have the gas techs help us out in this department.
</p>
There is one other possibility that we didnt check.  Clearly the cathode/drift HV is fine (its in series, would cause the anode to trip, etc.) but as the anode is in parallel its possible that the filter box might be broken in such a way that the HV doesnt make it to the chambers.  The one difficulty is that one might expect it to trip (it wants to trip against the box which is grounded to the side of the miniskirt.  However, it could have broken in such a way to avoid this and us be none the wiser when looking at the current draw (less parallel paths so we expect higher currents?).  We seen these filter boxes hit all the time; the box protects the interior stuff well and we need only to square up the box better.  Note that the 4 channels being very weak seems to discount this theory, but we should look at this as well as it should be easy to look for.  



<!-- Date: Fri Aug 27 08:29:46 2004 -->
<br><br>The <a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=09:20:33'> 
problems with the SW miniskirt wedge "16"</a> continue.  It trip twice when I turned it on.  The last time it made it to full voltage (on the drift) but triped a second later.  We'll go in shortly to work on this and the keystone, etc..  
<!-- Author: Dale and Ingyin -->


<!-- Date: Fri Aug 27 12:40:46 2004 -->
A quick update: 
<p> 
After SW wedge "16" tripped in the morning the plan was to go after  this wedge and the keystone wedge 5 at the same time.  However, we wanted to replace the fuses for the LV for wedge 7 (<a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=08:57:37'>see entry above</a>).  We also wanted to do it for wedge 5 of the keystone but this was a lower priority and the NW arch being pulled  would have made it harder to do anyway.  As luck would have it Ingyin found Craig and was able to get harness training.    We looked an found that the +6 V was fine but that the -12 V was dead.  Of course, the LV box isn't labeled so realistically it makes sense to replace both.  Dale reported that after replacing the fuses the +6 V still worked but the -12 V as bad.  We went through a few more iterations and blew 2 more fuses.  Dale notice that the last board didn't have +6 V (but the others did).  A few moments later after we confirmed that we were blowing the fuses, Dale discovered that the LV and signal cable were switched on board 7-00.  Through some combination of bad luck and trickery Dale had before plugged in the LV just before powering up the new board (7-00) when we finished working on the overlap area.  How / when the signal cable was put in the LV is unclear.  The bottom line is that the LV checks out now and the signal/LV cables are in their correct spots. 
</p> 
<p> 
We spent just a little bit of time on the SW miniskirt.  We saw the same weird case as noted in the first comment 
<a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=6&frame=2&anchor=03:49:57'> 
of this CMX elog entry</a>.  Namely that the drift draws to much current and gets "stuck" at .6 mA (increasing the voltage doesn't make it go higher).  We also had some troubles a different drogie and the "BMU" HV pod.  We'll hopefully resolve this soon. 
</p> 
Note that Dervin wanted to pull the SW arch so Ingyin went up to make sure that the cables pulled apart cleanly.  Dale remembers (when checking the LV for wedge 7) connecting 2 grounding tabs together (with black tape) and it must have been that one of the HV cables snagged on this.  Everything else was fine.  For now we left the one grounding leg up on board 7-00 taped up but we might just decide to take it down as well (Ingyin removed the other as it came off).  
<!-- Author: Ingyin, Dale -->
<!-- Comment: Sat Aug 28 13;40;19 comment by...Ingyin, Dale -->
<pre>Summary of work done on Friday:

We finished up checking out the HV for wedge 5 of the keystone.  The potenial problem (on the cathode) with stack 3 went away.  Stacks 4 and 5 were "robust" upon testing.  The cathode hold voltage fine and the current is steady with an applied anode HV.  The anode is a bit shaky - the current steadly fluctuates at ~10% of its value.  We know that the problem is apparent only with stack 3 (0, 1, 2, and 5 are well tested have steady currents on both the cathode and anode).

So far no trips on wedge 5 everytime we hook it up to the CAENs and iFIX.  Currently 39 chambers hooked up and running (out of 40 - recall the by-passed chamber).  [summary of SE miniskirt to come soon...]</pre>
<!-- Comment: Sat Aug 28 22;43;54 comment by...Dale and Ingyin -->
In other news on Friday, we looked at SE miniskirt wedge "16".  The anode filter box looked to be in good shape: no structure damage, the resistors were as labeled, conductivity good everywhere we measured.  Upon removing the cover and adjusting things, an immediate problem became noticeable.  The supply side gas line was folded over preamp 16-02.  Thus, the gas line was "kinked" and in a rather unhappy state.  We inspected the gas line and both agreed that the clear tubing had been pressed hard for a long time and one could see where it had been folded very easily.  Luckily, there were no signs of a tear or a hole.  An evaporation test showed no obvious signs of leakage.  We pressed the tube to be in its normal shape and wrapped a piece of kapton tape around the hose to make it obvious where the problem was and to structurally help things out.  It goes without saying that if our flow-meters were up to par this problem would have been spotted much sooner.

<!-- Date: Sat Aug 28 09:17:31 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-319&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-319  width='300' align='top'></a></td><td>The good, the bad, the ugly 
<p> 
Via short cosmic run.  More details to follow 
</p></td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Sat Aug 28 23;01;31 comment by...Dale and Ingyin -->
When we came in today we saw that things were not looking as good as we left them on Friday.  Most of wedge 6 was dead except for the last board which is oscillating.  Wedge 7 is clearly oscillating and trails into a fair amount of the SW arch.  <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=640&frame=2&anchor=14:28:28.385'>
Link to event display.</a>  In addition, the SE miniskirt doesnt look any better for stacks 1 and 2 of wedge 16.

<!-- Date: Sat Aug 28 22:18:43 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-320&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-320' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-321&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-321' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-322&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-322' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-323&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-323' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-324&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-324' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-325&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-325' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-326&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-326' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-327&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-327' width='300'></a></center>
<!-- Author: Dale, Ingyin -->
<!-- Comment: Sat Aug 28 22;19;13 comment by...Dale -->
Details to come soon...




<!-- Comment: Mon Aug 30 14;36;32 comment by...Dale and Ingyin -->
<pre>Memory not so good...

[starting left to right, top to bottom]

1.  This is the TDC output for wedge 6 board 11 but physically of wedge 6.  It looks very sick - signal very narrow.  [No or little A/E, HV on]

2.  This is one of the channels of wedge 7 but physically of wedge 6.  [HV on, same gas conditions].

3.  This is 2. but with the HV off!

4.  This is a normally good channel (?) with a signal but with oscilations.  Note that a hardcore oscilator is all sine wave and no signal.

5.  This is the direct pre-amp signal from board 7-01.  Frequecy is 32.8 MHz.

6.  Purple is the same signal (at 32.7 MHz) while yellow [sorry hard to see, click on the image to invert] is using the osciliscope probe with its grounding clip on the signal cable ground while the probe makes contact with the ground of the SHV cable that goes to the 2 channels of wedge 7 that are of physical wedge 6.  Note that this has since been repeated looking board 7-00 and this does not seem to occur.

7.  We take out the ground of signal cable 7-01.

8.  Looking at board 7-00.  The effect of removing a radeka (one of the trouble makers - removing a good guy does nothing - removing both bad guys kills the oscilation.)</pre>
<!-- Date: Sun Aug 29 09:57:46 2004 -->
Summary of work done on Saturday: 
<p> 
The original plan was to replace the radekas in wedge 5 of the keystone while trying to get the SW miniskirt ("16") to trip.  Of course, things changed when we saw the 2D YMon plot, etc. that signaled that we had oscillations.  Normally, we might have "let this slide" but as the problem almost certainly came from the newly  in use overlap area of the keystone and wedge 7, we decided to investigate and find possible solutions. 
</p><p>  We did our usual game of pulling LV and determined that wedge 7 was the problem.  Pulling LV cables told us that having board 7-00 (newly in use) off didn't cause oscillations while having it in (and 7-01 out, etc) caused them.  Note that the oscillations were extremely hardcore.  The 4th image above is a case where you can make out a signal over the oscillations but in many channels its just the oscillations.  What made things easy for us (?!?) was that we could turn off the HV and then play with the scope looking at signals directly from the preamp board.  The result is several images shown above.   
</p> 
<p> 
One can imagine spending a whole day looking at different things and noting them in a log book but our first job is to make the CMX work.  What isn't the problem? - the signal doesn't come through the SHV cables for the anode nor the grounding leg of wedge 7's anode patch panel (it seems that wedge 6 is grounded by just the connection of the supports.  Certainly, it be good to know that the ground of wedge 6 <b>is</b> the ground of wedge 7.  Adding additional grounding legs to preamp boards, etc. is voodoo at this point; every board is grounded - nothing weird for it to pick up on.  The obvious thing was to replace board 7-00 radeka's with modified ones (note board 6-11 already has modified radekas as does the rest of wedge 6 of the keystone). 
</p> 
We replaced the radeka and plugging things back (and turning HV on, etc.) we see no oscillations.  It is still very possible that the problem could come back to haunt us so we are not out of the woods yet.  Details on the images above to come in the near future.
<!-- Author: Ingyin and Dale -->
<!-- Comment: Sun Aug 29 10;11;21 comment by...Ingyin and Dale -->
More notes on Saturday:
<br><br>
We'll explain the whole story later and relate to the above images but the bottom line is that we think the keystone is under N2.  We see no signals in all of the keystone except for at the very - board 6-11.  Although there appears to be 3 signals, two look "real" while the other (recall missing one chamber) is odd - see the 1st image <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=22:18:43'>
above</a>.  Conversely, chambers for board 7-00 also have two almost real signals (2nd and 3rd image but under different circumstances) while the rest of wedge 7 is ok (when not oscillating).  The common dominator in all of this is that the problem is explained but not having gas as 2 chambers on wedge 6 are really apart of wedge 7 and vise versa.  Once can clearly see the Blue and Red gas lines that come from a special gas pipe in the ceiling.  Clearly it goes to the NW side but then we cannot see where it attaches, etc.  If it is hooked up to COT gas or CMP gas lines, etc. then its had N2 since Friday at the latest.  As a result, we are not turning on wedges 5-7 unless its "really necessary" to check something out.  If this is true it really sucks.

<!-- Comment: Sun Aug 29 11;04;01 comment by...muge -->
<pre>thsi is too long an entry to read now,but this whole wedge 6-9 oscill. saga is not very different from what happened 2-3 years ago and that was our biggest problem at the time. a dig into old elogs, logbooks etc, hopefully may give you some idea of what went on then (i only recall the 7-00 being the most peculiar preamp and that also 7 oscillated like mad even HV off. what exactly we did to solve it? i remember nothing other than disabling 7-00. but maybe we did more (which could be as easy as disabling wedge 6! or just pulling the arches back in!)). it will likely get back at you if it is not by some means cured! </pre>

<!-- Comment: Sun Aug 29 11;08;52 comment by...muge -->
<pre>oh ok, so did you replace the radeka on wedge 7-0? and that solved the problem? as i told Ingyin yesterday, taking 7-00 out would be the easiest solution, but if you were able to replace radakas that's even a better experiment.
anyways, i will talk to you guys to learn what really is happening 
as of now, since this is curious.</pre>


<!-- Date: Sun Aug 29 21:49:07 2004 -->
Summary of work done Sunday: 
<p> 
We went about replacing all of wedge 5 radekas with modified ones.  This went relatively quickly and was significantly easier once we added more light up on the keystone.  We intentionally left out radekas were we didn't need them (the by-passed chamber and where there are no physical chambers). 
</p><p> 
We investigated and found to channels to be "hot" for wedge 7.  These are the 2 channels physically of wedge 6 but of board 7-00.  These are wires (= YMon #) 0 and 1 or conversely TDC 48+4 and 48+0, respectively.  Note that the other channels on the board were dead as they should be (no HV) and there were no signs of oscillations in any other wedge.  We decided to go ahead and replace all board 7-01 radekas so that all of stack 0 has modified guys.  We think that it is clear that this helps; the modified radekas have a high enough "tolerance" that they don't oscillate and send other things crazy.  However, to root of the evil has not been found or eliminated.  To be honest, we like to get things into normal conditions: all chambers with A/E gas, the SW arch pulled in, etc. and then start from there.  There are several things that can be/should be considered.  For example, why aren't the 2 chambers of wedge 6 but physically of wedge 7 oscillating (or how do they compare in general)? 
</p> 
Dale will post more images (and explain the ones above) soon.  The major thing is that the 2 "ground zero" chambers oscillate differently.  <a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=22:18:43'> 
Image 3 above</a>, shows one of these channels (no HV - just the electronics!).  We'll post a slightly better image soon but the point is that the signal almost looks normal except for the damped oscillations/reflections afterwards.  More gory details to come. 
<!-- Author: Dale and Ingyin -->


<!-- Date: Mon Aug 30 08:33:18 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-328&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-328  width='300' align='top'></a></td><td><pre>YMon 2D occupancy: 
 
SE miniskirt 16 is alive! 
 
We must have HV cables switched; 17 --> 19  (oh that's right I for got to switch these back) 
 
Still have oscillations in first 2 wires in wedge 7. 
</pre></td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Mon Aug 30 08;39;33 comment by...Dale -->
SHV cables to the CAEN are switched back to normal.


<!-- Date: Mon Aug 30 09:11:37 2004 -->
<pre>With some amount of certainy it appears the the gas for the keystone is attached to the "notch".  This area would be assocated with (correct me if I'm wrong) the CMP gas.  "Gas tech" Dean + Craig were helpful in getting this information. 
 
Other gas info: 
 
Gas will likely be switched to N2 around Wednesday (after both plugs will be pulled).  Unfortinately, there is not much we can do about the gas, if we switched now the chambers might be flushed by Wednesday - no time to do much if something is bad.</pre>
<!-- Author: Dale -->
<!-- Comment: Mon Aug 30 13;54;23 comment by...Dale -->
In other gas news, I requested to Del to either get new "more sensitive" flow-meters for the miniskirts or to help us out and get some type of official measurement of the flows to the miniskirts relative to the arches.  The advantage is that when we check the gas flow rate (for example if we see 
<a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=12:40:46'>
a problem like SE "16" experienced</a>) we can act quickly and fix things.  In addition, for the purpose of calibrations for the drift velocity and knowing for sure that the gas is not stale, the measurement could cement our knowledge on whether it should be "the same" or "different".



<!-- Date: Mon Aug 30 20:44:44 2004 -->
SW "16" teases us from behind the toroid.  Trip at <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=644&frame=2&anchor=12:09:16.375'> 
~12:09</a> and then later at <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=645&frame=2&anchor=18:49:51.769'>~18:49</a>.  Note that the toriod might have been moving in an out starting around noon although there is reason to believe that this started later (for sure by 13:00 they were doing this).  
<!-- Author: Dale and Ingyin -->


<!-- Date: Mon Aug 30 20:46:41 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-329&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-329' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-330&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-330' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-331&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-331' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-332&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-332' width='300'></a></center>
<!-- Author: Dale -->
<!-- Comment: Mon Aug 30 21;08;24 comment by...Ingyin and Dale -->
<pre>From left to right:

1.  This is a good signal from elsewhere in the SW CMX arch (HV on of course).  Its "averaged" over many samples to make a nice image and get the most important features.

2.  This is the signal from one of the oscillating channels of board 7-00 (wire 0 or 1 or TDC%48 4 and 0).  [Note: similar to image 3 above.]  In this one, the HV is off.  We need to quantify it but the actual "rate" of signals appears faster then an normal good channel.  The event display clearly shows both channels firing on each event.

3.  This is a preamp signal from one of the oscillating channels.  I for got to note (so many details...) that we are using the special signal cable splitter.  This plugs into the preamp board and allows the signal cable to be connected (to allow it to "feed back") while a user samples from a twin 10 pin port.  Several useful measurements are noted on the side.

4.  This is the same channel (both bad guys give the same response) but with the signal cable removed (keeping the ground attached has no effect on size or overall shape).  Seems that we should have removed the "2 for 1 signal cable splitter" and sample from the preamp directly.</pre>


<!-- Date: Tue Aug 31 11:16:27 2004 -->
<p> 
We're abit upset about the HV being set to stand-by again (for all of CMX).  We think that our communication with the shift crew is good and that we do document our "prefrence" for the HV settings but still these things happen.  We'll have to re-double our efforts and explicitely explain things <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=646&frame=2&anchor=08:34:55.513'> 
like this</a>.</p> 
We also asked that the muon calibrations not be done until we (the muon group) give the ok to start up again.  See elog entry <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=646&frame=2&anchor=10:57:27.684'> 
here</a>.
<!-- Author: Dale and Ingyin -->


<!-- Date: Tue Aug 31 12:07:43 2004 -->
<pre>Work "in progress" update: 
 
We are working on preamp grounding wires for the 4 (total) chambers for boards 6-11 and 7-00 that are physically on the other wedge.  To do this we are using insulated wire (as long as the SHV cables) and the normal setup of grounding tabs etc.  The actual way we do this is to have "normal" lenght grounding legs on the preamp board and use the new wires to extend and attach to the grounding plate on the other arch's wedge. 
 
This work is nearly done.  Note that the signal cable ground was moved to the side of the signal cable to avoid and possible confusion in the future.  Also one tab will have to be replaced (thoes grounding tabs don't want to come off!) and the wires will have to be positioned so as to not get in the way of the chambers, etc. 
 
As soon as we get this done we will go up to wedge 5 and properly put on the grounding tabs.  Recall that for wedge 5 there is a very CMX like solution where somebody has just used pliers to try to attach the grounding tabs for the preamp board to signal cable. 
 
We attempted to work on measureing the the delta(T0) but we need to move and allow others to work in that area once we had gotten setup.</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Tue Aug 31 20;10;46 comment by...Ingyin and Dale -->
Summary:
<br>The grounding leg extensions for the overlap of wedge 6 and 7 is finished and we went ahead and reorganized the existing SHV cables.  Now things look neat and the cables should close (and open) easily when the arched is moved.
<p>
We also were able to replace the grounding tabs for wedge 5.  This also looks better than it did and we went ahead and put the signal cables into the appropriate boards.  The wedge still has no LV (no fuses in its box) and no currently no ASD card.  More work on this to follow.
</p>
<p>We went ahead and configured the SW miniskirt wedge "16" to be split up into two parts.  The first 5 degrees of this wedge is hooked up to iFIX wedge 16-17 while the remaining 10 degrees is iFIX 15.  We hope to get it to go into a bad phase sometime soon, and rush in to search for the problem.  It may require us telling the shift crew to keep on resetting it as the problems seems to go away to quickly.  Note that to do the HV split we opened up the middle 5 degree section and so no obvious problems.
</p><p>
During the weekend, we had taken out the signal cable (and low voltage) for board 6-11.  We put these back in and debated what to do about our oscillating signals.  As will be explained below, we have 3 oscillation channels - although all things being equal we expect 4 - each place where a chamber/channel is physically on the other wedge from what its assigned to.  The bad guys are [in wedge-stack-wire]: 6-5-6, 7-0-0, and 7-0-1 (or via TDC# 47, 48+4, and 48+0) while 6-5-7 (or TDC# 43) shows nothing when off and normal signals when on (see entry below).
</p>
We decided to make sure that we had a fall back point.  In other words, a system where we could test the HV for everything and (hopefully) not have oscillations.  As a result, we removed the radekas for the 3 bad channels (no more hot channels) but kept the one "suspect" radeka in.  As soon as the A/E is back and we are well flush, we will turn on, look at signals, and let things run night and day.  Ingyin points out that if we decided we could not recover the bad channels (we don't find a solution) then we should try replacing the radekas in the first stack with the old style ones.  We will consider such options once we can actively get to the keystone and feel there is enough time to test things out.


<!-- Date: Tue Aug 31 20:15:46 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-333&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-333' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-334&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-334' width='300'></a></center>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Tue Aug 31 20;32;24 comment by...Ingyin and Dale -->
Comments:
<p>
1.  This is a raw (unaverage) view via the scope of a signal from one of the bad "overlap" channels.  The signal is there regardless of HV (in this case its off).  Sample "Averaged" version is <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=20:46:41'>
seen in image 2 above</a>.  Note that the signals shows up in each event in the event display and are rather obvious in YMon.
</p><p>
2.  This is the signal for TDC channel 43 on wedge 6.  This would be YMon# 47.  This is a real signal (it has A/E since physically of wedge 7), looks legimate and shows up at the right rate.  Of course, no signal seen when HV is off.  It appears to be <i>normal</i>.
</p>
So here is the question that we CMXers need to answer: What makes this channel different from the others such that we don't have a problem where as for the other 3 channels (listed above) do?  More to the point, how can we make the others "behave" like this channel? 


<!-- Date: Fri Sep 3 08:20:53 2004 -->
<pre>Via the trip log - I'll explain later 
 
Wed Sep 01 14:28:43 2004  CMX  H TRP  Crate # 6  Channel # 38 
Wed Sep 01 14:28:43 2004  CMX  H TRP  Crate # 6  Channel # 34 
Thu Sep 02 18:26:47 2004  CMX  H TRP  Crate # 5  Channel # 38 
Thu Sep 02 18:41:36 2004  CMX  H TRP  Crate # 5  Channel # 38</pre>
<!-- Author: Dale -->
<!-- Comment: Fri Sep  3 08;44;04 comment by...Dale -->
The 2 trips on the NW 18-19 ("18") are on the anode.<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=651&frame=2&anchor=19:04:54.218'>
Here's a link</a> to the shift elog.  The previous trip is on the NE 18-19.
<br><br>
Right now I have the anode set at 5.6 kV and the drift at 2.6 kV for NW miniskirt "18" - it draws .3 microA on the anode.  Doesn't want to trip for us right now... I think we'll wait until after A/E has been returned to do any serious check out.  We (Ingyin and Dale) might take a quick tour before turning in our keys to check the areas out (also note what potection exist for which miniskirts, etc.).

<!-- Comment: Fri Sep  3 09;16;32 comment by...Dale -->
I've turned off the CMX after seeing if the trip would come back - it didn't.  Made a shift elog entry <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=652&frame=2&anchor=08:19:15.598'>
here</a>.
<br><br>
By the way, we also talked to Rob and he will (likely) change the gas today (see our entry 
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=651&frame=2&anchor=17:13:44.424'>here</a>).  The plan is for the welding to be done next Tuesday (?).  We might be well flushed by Friday and start bringing up HV for the weekend.  Clearly, we will push hard on the trouble makers on the west side miniskirts.
<br><br>
Mental note: I forgot to change back the settings for the NW miniskirt - <b>remember to change these back</b>.


<!-- Comment: Mon Sep 13 13;26;27 comment by...Dale -->
I changed back the HV settings for the NW miniskirt (wedge 18).  5.4 / 2.8 kV - the normal settings.


<!-- Date: Fri Sep 3 16:46:31 2004 -->
<pre>We did a super quick survey of the detector.  All the Miniskirt shelves are up and the one on the east side is "nicely" (the middle support looks a bit odd on the right side).  The anode filter box on the NW miniskirt (lowest box in phi) looks like it was hit but not damanged.  Impossible to say if this is related to the trips but also just as impossible to say that they aren't.  A box the SE also looked like it needed to be taped up (the bottom of the box was bent down a bit).  We also noticed that one of the covers (metal box) to the "valves" above the miniskirt was nocked off on the NW miniskirt.  Not sure why somebody left it on top of the counters - Fidior was there so he's aware of it.</pre>
<!-- Author: Dale and Ingyin -->


<!-- Date: Tue Sep 7 15:25:03 2004 -->
<body vlink="#ff0000" alink="#ff0000" link="#ff0000" 
style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"> 
<div style="text-align: center;"><big style="font-weight: bold;"><big>CMX 
Status</big></big><br> 
</div> 
<div style="text-align: center;">[9/8/04]<br> 
</div> 
<table 
style="background-color: rgb(0, 0, 0); width: 100%; text-align: left; margin-left: auto; margin-right: auto;" 
border="2" cellspacing="2" cellpadding="2"> 
<tbody> 
<tr> 
<td 
style="vertical-align: top; width: 9%; text-align: center; font-weight: bold; background-color: rgb(102, 255, 153);">CMX 
area<br> 
</td> 
<td 
style="vertical-align: top; text-align: center; font-weight: bold; background-color: rgb(102, 255, 153); width: 22%;">Reason 
for work (Problem)<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; text-align: center; font-weight: bold; background-color: rgb(102, 255, 153);">Progress 
/ Status<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(102, 255, 153);">Bridge 
overlap 6-7<br> 
(keystone-SW arch)<br> 
</td> 
<td 
style="vertical-align: top; background-color: rgb(102, 255, 153); width: 22%;">7 
channels are not in use but are expected to hold HV.<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; background-color: rgb(102, 255, 153);">Area 
completely connected to HV as "designed".&nbsp;&nbsp; Holds HV 
reliably.&nbsp; See signals but 3 (out of 7) channels oscillate.&nbsp; 
First stack of wedge 7 has modified radekas.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(102, 255, 153);">Wedge 
5<br> 
(keystone)<br> 
</td> 
<td 
style="vertical-align: top; background-color: rgb(102, 255, 153); width: 22%;">Entire 
wedge not in use.&nbsp; Unknown if it will hold HV reliably.<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; background-color: rgb(102, 255, 153);">By-passed 
1 channel and were able to get the whole wedge to hold HV.&nbsp; No LV 
(no fuses) but all radekas have been replaced with modified ones.&nbsp; 
No ASD board (yet).<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(102, 255, 153);">SE 
Miniskirt <br> 
(wedge 16)<br> 
</td> 
<td 
style="vertical-align: top; background-color: rgb(102, 255, 153); width: 22%;">1.5 
to 2 stacks which were working are dead in this wedge.<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; background-color: rgb(102, 255, 153);">Solved.&nbsp; 
Gas line kinked on preamp board.&nbsp; Gas line is fine and 
unkinked.&nbsp; Signals returned once gas flow had returned to normal.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(102, 255, 153);">SW 
Miniskirt<br> 
(wedge 16)<br> 
</td> 
<td 
style="vertical-align: top; background-color: rgb(102, 255, 153); width: 22%;">Cathode 
trips in an irreproducible pattern.<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; background-color: rgb(102, 255, 153);">Has 
tripped on us but not regularly.&nbsp; Current spikes to 150% of normal 
and trips a short while afterward.&nbsp; Divided wedge into 2 parts.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(102, 255, 153);">NW 
Miniskirt<br> 
(wedge 18)<br> 
</td> 
<td 
style="vertical-align: top; background-color: rgb(102, 255, 153); width: 22%;">Anode 
trips.&nbsp; 5 degrees disabled during a controlled access.<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; background-color: rgb(102, 255, 153);">Reconnected 
the by-passed 5 degree section.&nbsp;&nbsp; Had one episode of tripping 
on the anode but might have been human "interference".<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(102, 255, 153);">West 
Wedge 4<br> 
</td> 
<td 
style="vertical-align: top; background-color: rgb(102, 255, 153); width: 22%;">4 
dead channels - reason unknown and undocumented.<br> 
</td> 
<td 
style="vertical-align: top; width: 33%; background-color: rgb(102, 255, 153);">Investigated 
and found it to be best to be left alone.&nbsp; Connected HV to go to 
wedge 5.<br> 
</td> 
</tr> 
</tbody> 
</table> 
<br> 
Other issues:<br> 
<ul> 
<li>"Notch" gas switched to N2 during 1st week so the (physical) 
keystone had no signals, etc.&nbsp; Results of saying that the HV holds 
might not be true with A/E.<br> 
</li> 
<li>Oscillations on 3 of the 4 channel which are physically on the 
opposite wedge to the board (<a 
href="http://www-cdf.fnal.gov/internal/people/links/DaleStentz/shutdown/HVpatch6-7.jpg">image</a>).&nbsp;&nbsp; 
Oscillations are "<a 
href="http://www-cdfonline.fnal.gov/cgi/elog/det-system-elog.pl?nb=cmx&amp;action=view&amp;page=-330">unique</a>".&nbsp; 
After the radeka switch, they are localized (don't spread to the rest 
of the SW arch).<br> 
</li> 
<li>Rob and Del are looking in to getting new flow meters for the 
miniskirts which go to .2 scfh (not .5).&nbsp; Should help to eliminate 
problems such as the SE miniskirt tube kink above.<br> 
</li> 
<li>Currently have N2 to all chambers will replace with A/E later 
this week(?).</li> 
</ul> 
The plan:<br> 
<ul> 
<li>Fix the fuse on an ASD board and then test it.<br> 
</li> 
<li>Replace the fuses for the LV on the (wedge 5) keystone (need NW 
arch in).</li> 
<li>HV test for new chambers and try to fix tripping ones (SW and NW 
miniskirt, etc).</li> 
<li>Find a solution to the oscillating channels for the overlap area 
of 6-7.</li> 
</ul> 
More details at the <a 
href="http://www-cdf.fnal.gov/internal/people/links/DaleStentz/shutdown/shutdown04.html">CMX 
2004 shutdown page.</a><br> 
</body>
<!-- Author: Ingyin and Dale -->
<!-- Comment: Wed Sep  8 09;46;32 comment by...Ingyin and Dale -->
To be given at the Muon Hardware meeting for 9-8-04.



<!-- Date: Wed Sep 8 17:02:56 2004 -->
<pre>Update on Needed ASD board: 
 
We are going to use board #563303 for the keystone wedge (west wedge 5).  We changed out the +5 V fuse; its now got a 5A rated fuse and is ready to go.  We lowered the threshold to -1.00 V (it was at a "normal" value of about -1.6 V).  Of course, this is a factor of 10 larger than the real physics threshold (i.e. its really set at -100 mV). 
 
--------------------------------------------------------------- 
 
In other news, Muge and others pointed out that the notch (and thus the keystone wedges) could easily have its own bubler.  As a result, the realtive temp. could be differnt from SEX (and NEX).  In fact this appears to be the case.  When we looked we the notch at 76.2 F and the arches at 74.7 (the arches differed by about .4  ).  In the near future we will find out the history of the temp. via the ICICLE slow control data base [http://cdf-fs2.fnal.gov:3000/plug/javachart/icicle.htm].  This could help to explain why the drift velocity is so far off for wedge 6 realtive to the rest of the west arches. 
 
</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Wed Sep  8 17;07;21 comment by...Dale and Ingyin -->
Why -1.0 V?  - Because that what the other keystone wedge (and miniskirt wedges) are set at (<a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=5&frame=2&anchor=18:53:50'>as noted here</a>).

<!-- Comment: Wed Sep  8 19;39;04 comment by...muge -->
<pre>great, thanks for checking this! 
it looks like about 2 degrees F, but we do not know if this is
its stable value. We are in shutdown and the coll.
hall temperatures cannot be trusted during shutdowns 
(so, it is a good idea to check history).
as i mentioned earlier, it is also curious to know if
this bubbler is being shared by CMP chambers or not.
 
</pre>



<!-- Date: Mon Sep 13 14:31:12 2004 -->
We have setup the SW miniskirt to be on to further test the Cathode HV.  More details to follow - <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=668&frame=2&anchor=13:59:49.679'> 
see shift elog entry</a> for basic plan.
<!-- Author: Ingyin and Dale -->
<!-- Comment: Mon Sep 13 15;33;49 comment by...Ingyin and Dale -->
We have the iFIX/CAEN hooked up to the last 5 degrees of "16" via iFIX wedge 16-17 while the 1st 10 degrees are hooked up to iFIX wedge 15.  We set the HV settings to be .4/2.8 kV and .2/1.0 kV for on and stand-by, repectively.  [We don't want the anode to be on but don't want iFIX to complain about overvoltage due to the natural voltage 'felt' by the drift voltage.]
<p>
The plan is to wait until the SW goes into one of its "bad spells" and starts to trip.  Assuming it does trip, (its possible that the N2 might make this less likely to happen - recall the orginal testing of the west miniskirts in the assembly hall) we will run to B0 while the ACE continues to reset the channel to keep it "bad".  We have things partially setup already to make a quick switch to using HV down there.  We'll likely try to get it continue to trip and look any obvious problems.  Of course, if we don't get it to trip there not too much we can do (open all the covers - test each 5 degrees - etc.).
</p>
In other news, it seems that we might get Ops to move up the A/E gas date by a week - the previous set date was "mid-October".  We won't do much better than "eairly October" - Steve said Rob was reluctant to move things up sooner.  The ASD is ready to go - the +5V fuse has been replaced but we are waiting until we have better access to the crate before putting it in.


<!-- Date: Tue Sep 14 11:11:53 2004 -->
<pre>Our SW wedge continues to hold [see above] the the cathode (drift) HV.  We saw that the anode for iFIX 16-17 channel was set at 300 V and when clearly 400V is the 'on' voltage.  The settings were correct - this is in fact another weird situation where one side (anode or cathode) descided not to go up - 300 V was the stand-by setting before.  In any case, its fine now. 
 
Currents: 
iFIX 15 = .262 mA 
iFIX 16-17 = .157 mA 
[sum = .419 mA]</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Fri Sep 24 08;14;32 comment by...Dale -->
<pre>Brought back up the SW wedges after the power outage.  Currents are the same as above.  The wedge has failed to trip on us.  Might be the configuration but the gas still being N2 doesn't help.  We should get back A/E in the "first week" of October.</pre>


<!-- Comment: Mon Oct 11 16;45;04 comment by...Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=725&frame=2&anchor=16:41:30.640'>
Turned off the SW miniskirt wedges.</a>   We should get A/E gas this week.

<!-- Comment: Mon Oct 11 17;00;18 comment by...Dale -->
Of course, I changed the HV settings back and saved them.
<!-- Date: Wed Oct 6 14:48:45 2004 -->
Update on A/E gas and our general plans once it returns: 
<p> 
As reported else where, Rob confirmed that we should have A/E gas returning by mid-next week (Oct 12 or 13th etc.).  This hopefully means that we will turn on our chambers (or the ones that need testing anyway) by the end of the week (Oct. 15 is a Friday).  This, of course, overlaps with the plug (and also the toroid) being pushed in.  We may not much or anytime to work on a section (miniskirt or keystone) but we can at least turn on and know where the bad guys are at.  In addition, Rob mentioned that the gas techs are installing new flowmeters for the miniskirt (cool!).  We'll take a look the next time we go in. 
</p> 
<p> 
In other news, following the plug being put back in Rob wants to independently move the NW arch in to allow heavy equipment through.  This give us the perfect opportunity to put in the LV fuses for the wedge 5 keystone.  We will also use this time to put in the ASD card for this wedge (it very hard to get the ASD crate on the NW plus we're always in peoples way). 
</p> 
<p> 
I might update my page with this info and spell our our schedule.  The bottom line is that if things go as scheduled from now on the toroid should open up by the 22 (of Oct.) which will give us +3 weeks to finish up and have time for a proper - don't touch anything - 1 week check out with lots of cosmic runs, etc. 
</p> 
I made another "check" of the SW miniskirts.  Currents are right were they should be (perhaps a few micro amps lower) - the thing just won't trip on N2.
<!-- Author: Dale -->
<!-- Comment: Fri Oct  8 09;42;52 comment by...Dale -->
Update for the 2004 August shutdown webpage for CMX can be found <a href= 'http://www-cdf.fnal.gov/internal/people/links/DaleStentz/shutdown/shutdown04.html' target=_blank>here</a>.




<!-- Comment: Mon Oct 18 17;06;23 comment by...Dale and Ingyin -->
We <b>should</b> get gas flowing today.  Hopefully we'll have CMX flushed by Wednesday afternoon.  
<br><br>The plug may close as soon as Wednesday.  Next week the toroid will be closed (on the west side) to allow work on the supports for the low-betas [this has been delayed a week from the scheduel in the link above].
<!-- Comment: Tue Oct 19 12;23;44 comment by...Dale -->
Well...  A/E gas should start flowing on a fast purge on Wednesday (10-20).    

<!-- Comment: Wed Oct 20 15;47;32 comment by...Dale and Ingyin -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=742&frame=2&anchor=12:53:09.136'>
Now</a> we are in business - we should gain access to HV on Friday.
<!-- Date: Wed Oct 13 11:25:27 2004 -->
The new flow meters for the miniskirts are in place and are very nice. 
<br><br> 
They are in cm^3/min instead of SCFH. Here is the conversion: 
<p> 
1cm^3/min = 1cm^3/min * in^3/(2.54cm)^3 * ft^3/(12in)^3 * 60min/hr 
          = 0.0021 SCFH 
</p> 
This means that 0.1 SCFH (usual flow) is roughly 50 cm^3/min.  
<!-- Author: Ingyin and Dale -->





<!-- Date: Fri Oct 22 09:16:36 2004 -->
<pre>East plug is closed - shift crew has removed the miniskirt "shelves".  We should watch out and double check that nothing was hit.  Hopefully the west plug is up next. 
 
Hopefully Phil will unlock the HV soon.</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Fri Oct 22 12;56;38 comment by...Ingyin and Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=746&frame=2&anchor=11:23:23.515'>Things are underway...</a>
<p>
They put back the shelves.  They (ops+techs) are worried about an oil leak on the east side (after the plug was closed).  We noticed this ourselves.  We'll double check on this later.
</p><p>
We have all the arches on except for SE wedges 8-9 + 10-11 these have been switched so that we can power the SW miniskirt.  SE 8-9 = SW 16 [HV channel 7] while SE 10-11 = SW 17 [HV channel 1].  Of course, the 2 pairs of SW HV cables for the miniskirt are infact powering 2/3 [HV channel 7] + 1/3 [HV channel 1].  
</p><p>
A few of the arches have triped - nothing that repeats.  We're taking it easy and turn the wedge off for a while before reseting it.  So far the new configuration for the SW miniskirt has not triped.
</p>
In other news, the west plug will likely be closed on Monday setting back our plans of putting in the ASD and LV fuses for the wedge 5 keystone.  The keystone cannot be powered anyway as it has not offically been flushed and given the go ahead.

<!-- Comment: Fri Oct 22 13;05;24 comment by...Dale and Ingyin -->
Now the NW miniskirt (wedge 18 - HV channel 1) is mapped to iFIX SE 12-13.

<!-- Comment: Fri Oct 22 15;53;06 comment by...Ingyin and Dale -->
Nothing has tripped in its current configuration.<br>
<br>
We have <br>
<br>
<table style="text-align: left; width: 50%;" border="1" cellspacing="2"
cellpadding="2">
<tbody>
<tr>
<td style="vertical-align: top; width: 25%; text-align: center;">iFix
wedge<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">real
wedge<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">HV
channel<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">HV
Settings (A, D)<br>
</td>
</tr>
<tr>
<td style="vertical-align: top; width: 25%; text-align: center;">SE
8-9<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">SW
16-2/3</td>
<td style="vertical-align: top; width: 25%; text-align: center;">SW
7<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">(5.4,
3.0) kV<br>
</td>
</tr>
<tr>
<td style="vertical-align: top; width: 25%; text-align: center;">SE
10-11</td>
<td style="vertical-align: top; width: 25%; text-align: center;">SW
16-1/3<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">SW
1<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">(5.4,
3.0) kV<br>
</td>
</tr>
<tr>
<td style="vertical-align: top; width: 25%; text-align: center;">SE
12-13</td>
<td style="vertical-align: top; width: 25%; text-align: center;">NW
18<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">NW
1<br>
</td>
<td style="vertical-align: top; width: 25%; text-align: center;">(5.5,
2.5) kV<br>
</td>
</tr>
</tbody>
</table>
<br>
Note that for the SW CMX wedge we have the drift set higher using the
drogie (the CAEN supplies the anode with the drift set at 25V).&nbsp;
Thus, a trip on the cathode or the anode will be recorded by a trip in
the anode.&nbsp; The NW miniskirt is setup to over voltage the anode
(it draws ~.6 microA on the anode with these settings).<br>
<br>
In other news, the NE miniskirt is greasy but there are no obvious
signs of trouble for the electronics.<br>
<br>
If the SW starts to trip it will not be easy to do anything about it as
lots of stuff (ladder, N2 bottle, etc.) are in the way.&nbsp; We should
have open access by next Tuesday.<br>
<br>
The plan is for us to wait until we get paged and then go after what we
can during the weekend.&nbsp; Not much we can do.&nbsp; Looking at
signals (via cosmics) is an option but a low priority at this point.


<!-- Comment: Thu Oct 28 08;39;10 comment by...Dale and Ingyin -->
Note that HV cables have been switched back and settings set back to normal (and saved).
<!-- Date: Sun Oct 24 13:41:09 2004 -->
<a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=750&frame=2&anchor=09:28:46.955'>SE (east side) CMX  problem</a>  - the Bubbler Temperature is at  
61.8 F (low limit 17.5, hi limit 37 - all others are around 32-33 F).  We went ahead and had the ace turn off all of CMX while the matter was looked at in detail.  I've gone ahead and turned on the 3 west side miniskirts (which appear to be on in iFIX on the SE arch - oh well...).  I'm off to look in the trip log and put an entry in the shift elog.
<!-- Author: Dale -->
<!-- Comment: Sun Oct 24 14;45;25 comment by...Dale -->
<pre>The NW miniskirt did trip on the anode.

Unfortinately, to find this out I had to reboot Muon3.  It froze when I went to look at CMX.  (When I raised the voltages orginally I was in the control room.)  It was in a very sorry state - had to manually power cycle the PC (could terminate via windows taskbar, etc.).  I blame the HVMon log although that's just a wild guess.  

In any case, we had the same trouble as before - couldn't get HVMon to work as the CAENs for CMU are not on [the miniskirt pods are located here].  I'm fairly sure of this as its current configuration we have all off (central)showermax on via "DO NOT USE" checkbox for all the muon systems.  This means that we (CMX) are in the dark until we get things fixed on Monday.  CES works fine.</pre>

<!-- Comment: Mon Oct 25 08;28;10 comment by...Dale via Del and Dean -->
The SEX bubbler issue appears to be resolved.  Dean reports that the voltage outlet (the 120V @ 60Hz) went bad.  Pluging it in to the next outlet worked (the voltage line is the same).  The temperature is at 38.5 - still above the limit but a lot better than before.

<!-- Comment: Mon Oct 25 08;50;33 comment by...Dale -->
Note that the trip on the NW miniskirt happened on 07:27:26 on Sunday (just before the start of the shift).  Needless to say we hate these long time-scale trips.  Currently, none of the west miniskirt have triped.  Note that the west plug is now in.


<!-- Date: Mon Oct 25 16:44:04 2004 -->
<pre>wedge 5 trips at 2.6kV 
held 2.4kV start at 12:26:56 to 16:43:00 
raised to 2.5kV</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Mon Oct 25 17;39;45 comment by...Dale and Ingyin -->
Triped at 2.5kV at 17:12:00.  Time constant is about 30 min.  We made several attemps to see if it would reach normal voltage settings - in all cases wedge 4-5 trips around 2.6 kV and never "settles" at 2.8 kV on the drift.
<p>
Right now we have west 4-5 at 2.4 kV on the drift (and 4.8 kV on the anode) all signs point to a cathode problem although anode problems might exist.
</p><p>
We started the rather tedious task of testing each anode chamber in the 1st 5 degrees of wedge 18 on the NW miniskirt.  So far no obvious trouble makers.  If the time constant is 1.5 days (a lower estimate for the entire wedge) applies to the chamber we'll have to do full day testing.
</p><p>
With the plug in + electronics crates in we can hopefully get one full day in of work on the keystone to fix the trips on wedge 5 - we're going to start on stack # 2 and go from there.
</p><p>
The SW "16" triped <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=752&frame=2&anchor=15:00:46.686'>
as noted by the ace</a>.  According to beam-division people they heard a loud snap while we were out looking for droggies to use.  Unfortinately it hasn't trip since.  
</p>
Fairly certain there is a bunch of other stuff but the entry is too long as is.  More to come...


<!-- Comment: Tue Oct 26 08;11;19 comment by...Ingyin and Dale -->
<pre>CMX made it through the night.  I raised the settings on 4-5 to 5.0kV and 2.5kV on the anode and drift, respectively.

Not noted before was the fact that we worked (and are planing) on improving the support for the frist 5 degrees cover on the NW miniskirt.  We we started testing we noticed that one of the LV fuses on the preamp board (it would be board 18-4) was "broken".  The good news is that one of the legs basically had come off the board but we were able to put in back.  Looks like the LV works fine.  Improvements include putting in more screw supports and lowering the last 2 preamp boards which were on high stilts (too close to the top of the board).  Almost certainly there was a lot of physical contact here.  For example, the anode filter box (made out of Al) was bent out of shape.  We will likely replace it with one from the 10 degree section.  Our guess is that it was damange resently durning the plug close or, perhaps more likely, it was hurt by somebody grabing it/ using it to standup when coming out of the detector.</pre>


<!-- Date: Tue Oct 26 08:30:05 2004 -->
<pre>Unexpected trip on NE 20 (&lt;a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=754&frame=2&anchor=08:21:57.856'&gt;noted in the elog&lt;/a&gt;).  Recovered (turned back on).  There was some work in the area when Dale looked a few minutes later. 
 
Got wedge 4-5 to trip with the new settings (5.0, 2.5).  Just brought it back.  Will (soon) turn this and NW wedge 18 off to go down and start work. 
</pre>
<!-- Author: Ingyin and Dale -->
<!-- Comment: Tue Oct 26 13;14;44 comment by...Dale and Ingyin -->
<pre>Ingyin went up and worked on the keystone (wedge 5 HV) while Dale worked on the NW miniskirt.  Ingyin got 4 of 6 stacks to hold HV (e.g. two boards at once).  The wedge held on rampup when we combinded as we were about to be viced out of the area (the west toroid needed to be moved in).  Acording to the trip log it triped (likely on the cathode) at 12:24 (it held for ~ 1 hour).  We turned in back on to see if and when it happens again.   (Turned on at ~13:00).  We're looking into working late evenings to work with the toroid out (this requires Rob and crew to open it up after the BD gets done - slightly unlikely by our view - we'll see).

Right now 2 chambers are being tested on the NW miniskirt (1st 5 degrees of wedge 18).  We decide to go to long term testing - test for a full day to see if we can "get lucky" and find the problem.  It's really a shot in the dark at this point.

We may go after the SW miniskirt - basically the same game until something trips.  </pre>
<!-- Date: Tue Oct 26 10:39:24 2004 -->
<pre>iFIX (from the control room) complains: 
 
"Error Number:-2147186981 
Value is not accessible from this plan area" 
 
but it works fine from Muon3.  Don't suspect HVMon - no idea what's wrong...</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Tue Oct 26 13;15;50 comment by...Dale and Ingyin with Phil&#39;s help -->
this was solved - somebody must have logged out the ACE acount.


<!-- Date: Tue Oct 26 17:23:19 2004 -->
<pre>SE wedge 8-9 is tripping repeatedly on the cathode (starting around 4pm). We looked in the area and there was no obvious damage.  
 
NW 21 tripped on the cathode as well but came back up normally. There was someone working in the area.</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Wed Oct 27 08;13;59 comment by...Dale and Ingyin -->
<pre>CMX held throughout the night - all wedges were on except for SE wedge 8-9 which was at stand-by.  Tried to ramp it up again - triped on the cathode around 2.2kV.

Going to play the "CMX game" of changing the settings to see what holds.  We do not have access to the east side (toroid is split) and its likely that we may not get to look at it until later next week (after BD work is done).</pre>

<!-- Comment: Wed Oct 27 08;49;09 comment by...Dale and Ingyin -->
<pre>The cathode trips (on ramp up) when we set it to 2.3 kV but is fine (for the 5 min we tested) at 2.1 kV.  The anode seems fine as we staggered its settings while testing.  We're going to change the "on" settings back to normal and leave the wedge at stand-by.

Our gameplan, while techically thought out, is all over the map.  We are "ready" for the SW miniskirt to trip but it doesn't see to want to corperate.  Ingyin made good progress on the keystone but we had to stop to let the toroid be moved in.  We are testing 2 anode chambers at a time and leaving them on for an entire day (HV at 5.6, 2.5 kV).  This means we can test all chambers and be done by next Tuesday.  It seems like its still a shot in the dark.

Started the t0 analysis to figure out t0_modified - t0_oldstyle. The trouble occurs as a consistant spot to measure the "start" point of the rise in the signal is hard.  We're looking into better ways to do this.  

Hopefully they can move the west toroid out today so that the arch can be moved in.  

Our "united front" will have to do until we gain the freedom to work </pre>

<!-- Comment: Wed Oct 27 13;04;57 comment by...Dale and Ingyin -->
<pre>Wane needed access to the area next to the NW miniskirt via the gap in between so we shutoff the wedge until he finshined.  We'll go in soon and change to another pair of chambers and let that go for a full day.  

There's a lot of variation in our "test" measurements for the t0.  Once Dale get access to a real computer he'll load some of the images from the scope and what (little) progress has been made.

We'll try to get an update on the NW CMX arch (when can it move, etc).</pre>


<!-- Date: Thu Oct 28 08:36:04 2004 -->
<pre>Nothing tripped overnight.  NW miniskirt HV tests will continue with a switch to two new chambers later today (around ~13:00). 
 
The west toroid remains out - if BD doesn't need it to be in we'll work on the keystone.  Recall that we have the 1st 4 stacks hooked up - we'll test the other 2 and hopefully find the bad guy that was causing the trips on ramp up. 
 
SE 8-9 remains at stand-by.  We can't get to it as the SE half of the toroid is partially in.   
 
We think all parties would benifit from the NW (CMX) arch being in but still no action on this.   
 
We tested the fall time for preamp signals in order to get a real measurement of t0_mod - t0_old.  We'll go into details another time but our first run was on the SW miniskirt wedge 17 (board 7 signal 2).  We hope to do the same number of trials on a wedge in the arch.  However, while important this is a much lower priority then our HV problems.</pre>
<!-- Author: Ingyin and Dale -->
<!-- Comment: Thu Oct 28 13;58;51 comment by...Dale and Ingyin -->
We switched to two new chambers for the HV (anode) testing on the NW miniskirt 18.  They are holding.
<!-- Comment: Fri Oct 29 08;21;35 comment by...Ingyin and Dale -->
Our work on calibrating the t0 for the modified preamps (realtive to the "old style") continues.  Now we are working on wedge 21 in the NW (it's close to the floor).  This work is naturally slower as we need to turn the HV off and on after we switch radekas.  We'll post the results / details later.
<br><br>
They moved in the west side CMX arches around 10:30 yesterday (10/27).  We promply put in the LV fuses and later in the afternoon put in the <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=17:02:56'>
ASD card (#563303)</a>.  Channel #24 [=TDC channel] is bad on the ASD board.  Dale thinks that last pin (counting down to up) is broken but the last pair of pins is the "25th" for the connector and thus may not usefull(?).  Needless to say we'll try to start looking at signals soon.  If the one channel is bad we can live with that otherwise we look at the other board (#563313) and see if we can use that.
<!-- Date: Thu Oct 28 12:20:37 2004 -->
Switching the SHV cables at the back of the CAEN such that SE 8-9 = SE 10-11 and vice versa.  This will test the CAEN pod.
<!-- Author: Dale -->
<!-- Comment: Thu Oct 28 12;24;29 comment by...Dale -->
The trip followed the switch - it's not the pod/CAEN.


<!-- Comment: Thu Oct 28 21;19;18 comment by...Dale and Ingyin -->
We switched the cables for the same wedges at the SE patch pannel.  The trip followed the switch again.  Its either the cable to wedge 8-9 or (more likely) one of the wedges themselves.  The toroid is out on the east side but the plug creates are still out.  We may go after this wedge on Friday if things open up like they should.


<!-- Date: Thu Oct 28 21:23:31 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-335&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-335' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-336&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-336' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-337&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-337' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-338&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-338' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-339&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-339' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-340&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-340' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-341&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-341' width='300'></a></center>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Thu Oct 28 22;24;55 comment by...Dale and Ingyin -->
Scope captures (moving left to right):
<p>
1.  512 signals averaged for a modified radeka<br>
2.  512 signals averaged for an old style radeka<br>
3.  an example of a signal we would not select; 2 signals together<br>
4.  single signal for a modified radeka<br>
5.  like 5 but shows how we measure delta_t<br>
6.  single signal for a old style radeka<br>
7.  like 6 but shows how we measure delta_t</p>
Many more details to come.


<!-- Date: Thu Oct 28 22:45:26 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-344&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-345  width='300' align='top'></a></td><td>A PR plot showing an [averaged] scope trace of preamp signals via modified radeka vs. old style radeka.  Note that the long rise time is an artifact of the averaging.  Also note that the peaks have been aligned to clearly show (what we already know) that the modified preamp signal is larger then the old style signal.  </td></tr></table>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Sun Oct 31 16;27;31 comment by...Ingyin and Dale -->
What's this all about?
<p>
As noted <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=6&frame=2&anchor=12:29:02'>
before</a>, we are interested in a real measurement of what t0 should be chosen for a modified preamp (keystone/miniskirt, etc) realtive to the t0 for the arches.
</p>
<p>
Our initial plan as outline in the link above was not the most effective way.  The problem is that while averaging over a signal (letting the scope add traces together) give a good description of the peak of the signal it is rather poor at giving a true representation of the actual turn on of the signal.
</p>
<p>
The problem comes about as we need to make a measurement for a signal with a "old style" radeka and then try to do the same with a "modified" one.  Bottom line is that the long base line gives us a bad error if we want to do a measurement of delta_t.  Here we define delta_t as the time it takes a signal to go from the baseline (~0 mV) to the threshold (-100 mV for the modified guys, 160 mV for the unmodified).  This is the "fall" time of the signal.  Clearly the solution is to measure delta_t for many single signals and go from there.
</p>
What's shown in 5 and 7
<a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=21:23:31'>
above</a> is how we measure delta_t.  There are many details on what signals we reject and the exact procedure.  This will be explained another day...
<!-- Comment: Tue Nov  2 16;22;05 comment by...Dale and Ingyin -->
Procedure:<br>
<br>
We take 8 modified radekas and 8 "old style" radekas.&nbsp; We choose a
convent location (in this case one spot was 17-07-02 the other was
21-00-02 [wedge-board-wire]).&nbsp; We then did a series of 8 single
signal measurements for each radeka.&nbsp; We adjusted the threshold
for the scope to be at the ASD card threshold.&nbsp; For the miniskirts
this is -100 mV while for the arches (the values that Dale remembers)
are consistently around -160 mV.&nbsp; We tried our best to pick a
standard sample of signals.&nbsp; For example, signals where there were
two signals the (2nd one turning on before the 1st passed the
threshold) were rejected.&nbsp; We generally required the voltage to be
"still falling" thus approximately linear past the
threshold.&nbsp;&nbsp; We also rejected&nbsp; signals where the voltage
was flat but not the ~0 mV baseline (it had multiple muon hits and was
slowly falling).<br>
<br>
We used the built in cursor function of the scope to measure the "fall
time" of the signal.&nbsp; This is explained and shown above.&nbsp; We
define t1 to be where the signal is at the "baseline" just as it starts
to fall and&nbsp; t2 as the time that the signal passes
threshold.&nbsp; Thus we are interested in delta_t = t2 - t1.&nbsp; The
relative error in measuring the voltage drop and time difference is
small relative to the signal by signal variance.&nbsp; We estimate
these at +/- 3 mV (at 50mV / division) and +/- 2 ns (at 20 ns /
division).&nbsp; Note that the voltage error would propagate to an
estimated +/- 4 ns for very narrow signals.&nbsp; The error is closer
to +/- 1 ns for modified (wider signals).<br>
<br>
After having two sets of trials of 8 we look and make sure that the 2
sets of data are consistent (e.g. modified radeka #3 should not change
from one location to another).&nbsp; Assuming that this hypothesis is
correct we then combine the data sets.&nbsp; After that all of the data
for the two types of radekas can be combined (thus 128 different
measurements for delta_t).&nbsp; One can then take the difference of
the average of the modified radekas with that of the old-style
radekas.&nbsp; Errors due to the natural variation of the sample will
be included.<br>
<!-- Comment: Fri Nov  5 14;02;40 comment by...Dale and Ingyin -->
<table border=0><td><tr><td bgcolor=#e0e030>Slight choke on our part - the more "typical" value for the threshold for the ASD's in the arch is -140 mV.</td></tr></td></table>
<!-- Date: Fri Oct 29 11:17:36 2004 -->
<pre>We think we found the trouble maker in the NW keystone.  It now holds HV (doesn't trip on ramp up).  The trip was traced to 5-4-4 (wedge-stack-wire) or board 9 - wire 2 (bottom from onlooker - "top" as defined by the board (the purple capacitors on the west side are on top such that they are closer to the center of the detector).  The anode draws .4 microA while the drift draws a respectable amount of current at .638 mA. 
 
We 'll put in the LV cables after it's been allowed to burn in some more. 
 
After lunch we'll test differnt chambers on the NW miniskirt again.  We'll look into working on SE 8-9 and hopefully finish up our t0 calibration work.</pre>
<!-- Author: Ingyin and Dale -->
<!-- Comment: Sun Oct 31 15;25;47 comment by...Dale and Ingyin -->
The low voltage cables are in - haven't looked at YMon yet to see if we got anything.

We worked on the SE and (finally) got things to work, see below.
<!-- Date: Sat Oct 30 13:18:38 2004 -->
We'll post more details after rechecking things out but it appears that we have a <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=761&frame=2&anchor=19:50:30.508'> 
working solution</a> for the trips on SE 8.  We by-passed 8-5-4 [wedge-stack-wire].  
<!-- Author: Dale and Ingyin -->
<!-- Comment: Sun Oct 31 15;23;04 comment by...Ingyin and Dale -->
We got the stack wrong.  It's actually stack # 4.  Thus 8-4-4 was by-passed.  Note that for this stack we removed the cover.  Also note that we by-passed the wedge because "it works without it".  Normally we require that we actually work our way down to figure out what the problem is.  In this case the only possibility is that one of the jumpers is bad or that the chamber is bad.  The chance that it's the jumpers is very small but as we were not even able to get the jumpers out to test them means that there's a little hope left for this wedge.  Hopefully the next generation CMXer will have narrow+long fingers.


<!-- Comment: Sun Oct 31 15;26;54 comment by...Dale -->
"little hope left for this *wedge*" , wedge -> chamber


<!-- Date: Sun Oct 31 15:33:52 2004 -->
On Saturday we also worked on our t0 calibration measurements.  This is mostly done although we still have yet to discribe what we were doing.  More info to come soon. 
<br><br> 
Work done yesterday is nicely summarized in the <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=763&frame=2&anchor=17:20:56.488'> 
shift e-log</a>.
<!-- Author: Dale and Ingyin -->



<!-- Date: Sun Oct 31 16:42:57 2004 -->
So NW iFIX 18/19 tripped twice(!!!) yesterday [we'll include the link later] on the anode(!) after we changed to a new chamber.  We are likely to test the remaining chambers but keep a special eye out for this one.  We'll likely come back to it - set it up to test the suspect chamber along side the rest of the wedge (e.g. minus the suspect).  We'll note which chamber it is when we come back up.
<!-- Author: Dale and Ingyin -->
<!-- Comment: Tue Nov  2 08;24;39 comment by...Dale and Ingyin -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=763&frame=2&anchor=16:20:52.507'>
Link.</a><br>
The chamber in question is 18-1-5 [wedge-stack-wire].  It looked fined but we went ahead and replaced the anode "antenne" (we replaced it with one from a 10 degree section out in the hall).  Since <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=767&frame=2&anchor=17:41:52.561'>
this entry</a> we have been testing the final chamber (that hasn't been tested for > day) and the suspect one mentioned above.  Its highly possible that we might go to a weird configuration mentioned above - test the suspect while testing the rest of the wedge.  We might also overvoltage it more but we'll pass that bridge when we get to it.
<!-- Date: Mon Nov 1 12:28:49 2004 -->
We went ahead and put back 3 modified radikas back in to the new bridge/overlap area (explained <a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=12:07:43'> 
above</a>).  Bottom line is there didn't appear to be any occislations without these in.  We looked at signals and saw no ossiclations with the HV off (in sections that were off and on).  Same thing when we turned wedges 6 and 7 back on. 
<p> 
We saw signals in the 3 new spots (no signs of noise).  In addition, we looked at wedge 5.  The good news is that most of it is good but there are some dead channels where there shouldn't be.  We'll post the details later.  We'll likely go after these guys and figure out where the problem lies (ASD, TDC, radeka, etc.).  This is a slow process and but its silly no to understand what's going on and to recover what we can.  In parituclar, 3 signals are "weird" - one of the legs is inverted and rather lame compared to what you would expect for a real signal.  We suspect the ASD but the jury is still out.  If its the ASD, the last real expert on this just left, we'll have to be quick on our feet if we need to really fix the card we have in. 
</p> 
At some point we might get kicked out for alignment/support work on the beta-quad.  We also need to test the last chamber and the one "suspect chamber on the NW miniskirt.
<!-- Author: Ingyin and Dale -->
<!-- Comment: Tue Nov  2 08;30;59 comment by...Dale and Ingyin -->
Forgot to mention that while we were up there we saw that the overlap with all of its new cables actually closed nicely.  The long cables look odd to say the least but it works and apears to be realtively robust of a setup.
<!-- Date: Tue Nov 2 08:04:16 2004 -->
An apparently random trip on NE "19" [iFIX 20].  It tripped on both channels (anode and drift).
<!-- Author: Dale -->
<!-- Comment: Tue Nov  2 08;32;10 comment by...Dale -->
forgot to say - around 4:30 today.


<!-- Date: Tue Nov 2 11:33:24 2004 -->
Here's an update on the new NW wedge 5 keystone:<br> 
<br> 
We are getting signal out but there are some problems.&nbsp; First the 
known issues:<br> 
<br> 
TDC# 48+20 and 48+38 are dead as the chambers are by-passed due to HV 
problems (both trip on the cathode).<br> 
<br> 
TDC# 48+24 is dead due to the ASD - we know this as the last time we 
used the board this channel was dead.<br> 
<br> 
The unresolved guys (we understand where the problem lies but not why 
it exists) are <br> 
<br> 
TDC# 48+10 and 48+23 are <span style="font-style: italic;">weird</span> 
as the signal looks screwy (one of the legs doesn't get inverted and is 
damped).&nbsp; Switching signal cables has no effect while switching 
back door ASD cables switches the problem.&nbsp; This indicates that 
the problem is with the ASD.&nbsp; (No problems are suggested by the 
TDC.)<br> 
<br> 
TDC# 48+9 is dead on the preamp board.&nbsp; Thus, looking at the 
preamp board directly shows that there is no signal even when a good 
radekas are rotated in.&nbsp; This is confirmed, of course, with the 
switching of the various cables.<br> 
<br> 
We note for completion that TDC# 48-[0-3] and 48+[44-47] are dead as 
the chambers do not physically exist.&nbsp; Note that at least one of 
these guys has "wrong (voltage) levels" which suggest another ASD 
problem.&nbsp;&nbsp; In case you haven't figured out the rest of the 
channel (36 w/ 2 channels weird but alive) are alive.<br> 
<br> 
We're looking into solutions for the ASD.&nbsp; In the case of TDC# 
48+9 we probably will let this board be and replace/fix it another time.
<!-- Author: Ingyin and Dale -->


<!-- Date: Tue Nov 2 13:22:41 2004 -->
In other news, YMon shows no occupancy for the muon systems. 
<p> 
While this is hardly a CMX problem it does hurt us from checking out the detector as a whole.  This is noted in the <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=766&frame=2&anchor=09:16:08.576'>shift elog</a> after Dale brought it up in the (still weekly) 8:00 meeting (11/1) and Kaori and the consumer-ers checked it out.  The problem is not at there end.  More to the point its hard for us to figure out how the consumers/CSL could recieve/send info to COT, shower-max, calorimeters, etc. and not to the CMU/P/X muon plot. 
</p> 
We (includes Phil) have looked at the TDC and trigger crates and things seem to be in working order.  (Lights blinking...)  We'll try to get other minds involved.  Phil suggests to look at the raw data itself.  Ingyin wonders about the CSL while Dale thinks trigger/trigger table.  It seems somebody should know.
<!-- Author: Dale and Ingyin -->
<!-- Comment: Sat Nov  6 12;28;02 comment by...Dale and Ingyin -->
Bill fixed it [<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=775&frame=2&anchor=16:42:06.944'>see shift e-log</a>].  
<p>
"(The) muon crates had not been rebooted  
since I (Bill) fixed a bug in the front end readout  
configuration code -- this explains why no  
muon banks were read out recently."
</p>
We checked run <a href='http://www-cdfonline.fnal.gov/java/cdfdb/servlet/RunSummary?RUN_NUMBER=189070'>
189070</a> and see that the occupancies have returned for the muon systems.  We'll post some plots soon.
<!-- Date: Tue Nov 2 16:27:19 2004 -->
For the Muon hardware meeting 11/03/04: 
<div style="text-align: center;"><big style="font-weight: bold;"><big>CMX 
Status</big></big><br> 
</div> 
<div style="text-align: center;">[11/3/04]<br> 
<br> 
</div> 
<table 
style="background-color: rgb(0, 0, 0); width: 100%; text-align: left; margin-left: auto; margin-right: auto;" 
border="2" cellspacing="2" cellpadding="2"> 
<tbody> 
<tr> 
<td 
style="vertical-align: top; width: 9%; text-align: center; font-weight: bold; background-color: rgb(204, 204, 255);">CMX 
area<br> 
</td> 
<td 
style="vertical-align: top; text-align: center; font-weight: bold; width: 15%; background-color: rgb(204, 204, 255);">Reason 
for work (Problem)<br> 
</td> 
<td 
style="vertical-align: top; text-align: center; font-weight: bold; width: 35%; background-color: rgb(204, 204, 255);">Progress 
/ Status / Plan<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(204, 204, 255);">Bridge 
overlap 6-7<br> 
(keystone-SW arch)<br> 
</td> 
<td 
style="vertical-align: top; width: 15%; background-color: rgb(204, 204, 255);">7 
channels are not in use but are expected to hold HV.<br> 
</td> 
<td 
style="vertical-align: top; width: 35%; background-color: rgb(204, 204, 255);">No 
HV problems.&nbsp; When the arch was out it oscillated like 
crazy.&nbsp; Now with the gas back to A/E and the arch closed up we see 
no oscillations when we put back the 3 modified radekas into the 
"suspect" preamp channels.&nbsp; <span style="font-weight: bold;">Plan</span>: 
try to get it to oscillate (how?).&nbsp; Fix if it does, otherwise 
leave as is.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(204, 204, 255);">Wedge 
5<br> 
(keystone)<br> 
</td> 
<td 
style="vertical-align: top; width: 15%; background-color: rgb(204, 204, 255);">Entire 
wedge not in use.&nbsp; Unknown if it will hold HV reliably.<br> 
</td> 
<td 
style="vertical-align: top; width: 35%; background-color: rgb(204, 204, 255);">By-passed 
2 chambers due to HV problems.&nbsp; Rest of the wedge holds 
fine.&nbsp; LV is on and ASD card is in.&nbsp; One bad channel due to 
ASD card while a couple of channels have bad levels (also due to 
ASD).&nbsp; Another channel is bad on the preamp board.&nbsp; <span 
style="font-weight: bold;">Plan</span>: replace ASD card with 
fixed/switched one.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(204, 204, 255);">SE 
wedge 8<br> 
</td> 
<td 
style="vertical-align: top; width: 15%; background-color: rgb(204, 204, 255);">Started 
to trip after A/E gas came back.<br> 
</td> 
<td 
style="vertical-align: top; width: 35%; background-color: rgb(204, 204, 255);">We 
by-passed a chamber (couldn't test it directly) and now the wedge 
holds.&nbsp; <span style="font-weight: bold;">Plan</span>: might 
document the wedge HV setup better; we could not figure it out.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(204, 204, 255);">SW 
Miniskirt<br> 
(wedge 16)<br> 
</td> 
<td 
style="vertical-align: top; width: 15%; background-color: rgb(204, 204, 255);">Cathode 
trips before shutdown.<br> 
</td> 
<td 
style="vertical-align: top; width: 35%; background-color: rgb(204, 204, 255);">Has 
not tripped since before getting N2 at the start of the shutdown.&nbsp; 
Have split in two, over voltage, etc. - we cannot get it to trip.&nbsp; 
<span style="font-weight: bold;">Plan</span>: continue testing.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(204, 204, 255);">NW 
Miniskirt<br> 
(wedge 18)<br> 
</td> 
<td 
style="vertical-align: top; width: 15%; background-color: rgb(204, 204, 255);">Anode 
trips.&nbsp; 5 degrees disabled during a controlled access.<br> 
</td> 
<td 
style="vertical-align: top; width: 35%; background-color: rgb(204, 204, 255);">Going 
through and testing each chamber one by one for &gt; 1 day.&nbsp; One 
suspect wedge which tripped twice during testing.&nbsp; We have 
replaced a possible weak link (anode antenna).&nbsp; <span 
style="font-weight: bold;">Plan</span>:&nbsp; continue long term 
testing.<br> 
</td> 
</tr> 
<tr> 
<td 
style="vertical-align: top; width: 9%; background-color: rgb(204, 204, 255);">Gas 
flow-meters for Miniskirts<br> 
</td> 
<td 
style="vertical-align: top; width: 15%; background-color: rgb(204, 204, 255);">Flow-meters 
are not very useful (flow is much lower).<br> 
</td> 
<td 
style="vertical-align: top; width: 35%; background-color: rgb(204, 204, 255);">We 
have new flow-meters (thanks to Del and Rob) they work great!&nbsp; <span 
style="font-weight: bold;">Plan</span>: use flow-meters during 
checkout (make sure no kinked gas lines, etc.).<br> 
</td> 
</tr> 
</tbody> 
</table> 
<br> 
<br> 
<br> 
CMX reconstruction related issues:<br> 
<ul> 
<li>keystone 'location' measurements: we like to do this right and 
make the right set of measurements.<br> 
</li> 
<li>t0 calibration for modified preamps:&nbsp; This work is largely 
done.&nbsp; Will hopefully present at an upcoming muon reconstruction 
meeting.</li> 
</ul> 
<br> 
Other unresolved errors:&nbsp; YMon does not fill up the muon occupancy 
plot.&nbsp; The exact problem is unknown.&nbsp; Who can look into this 
issue (all systems need this!)?<br> 
<a 
href="http://www-cdf.fnal.gov/internal/people/links/DaleStentz/shutdown/shutdown04.html"></a>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Thu Nov  4 08;49;41 comment by...Dale and Ingyin -->
Phil added that we should use a sniffer and check for gas leaks by the flow-meters


<!-- Date: Thu Nov 4 12:26:37 2004 -->
Update: 
<p> 
The SW arch opened up; for people to work on the "wet" COT cards etc. (also the west toroid is out and it appears that the BD people are done with the beta-quad support work).  We see no osscilations in this configuration.  The 3 signals that did osscilated show a much narrower signal (we have infact seen this before) - we'll document and show what's up later. 
</p> 
<p> 
With the toroid out we hooked up the NW miniskirts to their "normal" operational setup (nothing by-pass + test all of the wedge).  We still have the 1st 5 degrees cover off.  We'll continue down this path until next week. 
</p> 
We also getting ready to try our "spare" ASD boards.
<!-- Author: Dale and Ingyin -->
<!-- Comment: Fri Nov  5 08;45;19 comment by...Dale and Ingyin -->
ASD work summary:<br>
<br>
We tried 3 different boards.&nbsp; It turns out one of them is
"perfect" (all channels seem to be alive and well).<br>
<br>
<table style="text-align: left; width: 67%;" border="1" cellspacing="2"
cellpadding="2">
<tbody>
<tr>
<td
style="vertical-align: top; text-align: center; width: 20%; background-color: rgb(255, 255, 255);">ASD
Board #<br>
</td>
<td
style="vertical-align: top; text-align: center; width: 15%; background-color: rgb(255, 255, 255);">Attempt<br>
</td>
<td
style="vertical-align: top; text-align: center; background-color: rgb(255, 255, 255);">Problems<br>
</td>
</tr>
<tr>
<td
style="vertical-align: top; text-align: center; width: 20%; background-color: rgb(255, 255, 255);">563<span
style="font-weight: bold;">303</span><br>
</td>
<td
style="vertical-align: top; text-align: center; width: 15%; background-color: rgb(255, 255, 255);">1st<br>
</td>
<td
style="vertical-align: top; background-color: rgb(255, 255, 255);">dead
on 24, wrong/weird levels on 3, 5, 9, 10, 23 [last 8 channels are ok]<br>
</td>
</tr>
<tr>
<td
style="vertical-align: top; text-align: center; width: 20%; background-color: rgb(255, 255, 255);">563<span
style="font-weight: bold;">313</span><br>
</td>
<td
style="vertical-align: top; text-align: center; width: 15%; background-color: rgb(255, 255, 255);">2nd<br>
</td>
<td
style="vertical-align: top; background-color: rgb(255, 255, 255);">dead
(+ wrong levels for some) on 21, 23, 25, 29, 34, 35, 38, 39<br>
</td>
</tr>
<tr>
<td
style="vertical-align: top; text-align: center; width: 20%; background-color: rgb(255, 255, 255);">563<span
style="font-weight: bold;">342</span><br>
</td>
<td
style="vertical-align: top; text-align: center; width: 15%; background-color: rgb(255, 255, 255);">3rd<br>
</td>
<td
style="vertical-align: top; background-color: rgb(255, 255, 255);">good
on all active channels - correct levels where signal is dead<br>
</td>
</tr>
</tbody>
</table>
<br>
Time is winding down quickly.&nbsp; If our cables were neat and
organize we might try to "optimize" our ASD configuration.&nbsp; For
example there might be a board which would be better for the keystone
(it could have&nbsp; problems in 0-3 and 44-47)&nbsp; or we could try
563303 in one of the wedge 15s and try to get&nbsp; a deceit board out
of that switch.&nbsp; Alass there's a much greater chance that we'll
disturb things that are already working for a possible gain in 2-4
channels.<br>
<br>
Currently, board 563342 is in the NW keystone 5 slot (Dale remembers
slot 20 although it's clearly the 2nd card from the right).&nbsp; We'll
look at more signals via the TDC crate to look for (new) bad
channels.&nbsp; Obviously YMon would greatly help in this effort.<br>
<br>
Note that TDC # 48+9 (for wedge 5) is the only potenial channel we can
pick up.&nbsp; Recall that the signal is dead on the preamp board
[radeka switching doesn't help].&nbsp; Switching the preamp board
should fix the problem.

<!-- Comment: Fri Nov  5 08;54;52 comment by...Dale and Ingyin -->
<pre>Forgot to note that the HV configuration for the NW miniskirt (while setup to full test both wedges) is still overvoltage on the anode.  In other words we have 5.6, 2.5 kV settings.  We are debating whether or not we gain anything from increasing the voltage more.  Note that wedge "19" is basically a 'control' wedge - we never had the anode trip here.

We also state the obvious as the one suspect chamber did not trip for the +2 days we tested it with the replace anode antenna.</pre>




<!-- Date: Tue Nov 9 10:41:24 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-346&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-346  width='300' align='top'></a></td><td><pre>Here's the much needed occupancy plot for CMX.  A couple of things to note: 
 
1.  need to make sure we haven't picked up any new dead channels  (and that we understand the ones we have in the new sections. 
 
2.  Overlap area is semi-oscillating.  Clearly has about a factor of 20 in the wedge occupancy realtive to the other arch wedges.  YMon #46 for wedge 6 has a multiplicity of about 6.5 while YMon #0 and 1 have about 5 hits per event.  Note that wedge 6 YMon #47 is normal despite also being a "cross-over" chamber like the 3 mentioned above. 
</pre></td></tr></table>
<!-- Author: Dale and Ingyin -->


<!-- Date: Tue Nov 9 13:53:23 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-347&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-347' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-348&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-348' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-349&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-349' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-350&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-350' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-351&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-351' width='300'></a></center>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Tue Nov  9 13;58;10 comment by...Dale and Ingyin -->
Details to posted soon...  TDC scope traces from wedges 6 and 7
<p>
TDC channel # from left to right:
43, 47, 48+0, 48+1, 48+4
</p>

<!-- Comment: Wed Nov 10 14;29;13 comment by...Dale and Ingyin -->
In terms of a YMon # (= stack*8+wire) the same channels are:
[wedge 6] 47, 46, [wedge 7] 1, 3, 0.  Compare with YMon plot above.


<!-- Comment: Fri Nov 12 16;16;47 comment by...Dale and Ingyin -->
Details on plots and plan of action:
<p>
So in terms of YMon 'channels' # 47 is "suspect" [it, like 46, are on wedge 7] but looks fine interms of occupancy and hit multiplicity, etc.  Looking at it in detail it seems obvious that the width is much too large [see 1st plot above] while the signal in a previous working chamber in wedge 7 (the 4th plot - YMon = 3) looks ~ normal, 100-200 ns width.
</p>
YMon 47, 0, and 1 are the bad guys - the ones that we will almost certainly remove the radekas for.  Note that we will likely put the  old style radekas back in wedge 7 for uniformity sake if we remove the other 3 guys.  Notice that the 2nd, 3rd, and 5th plot above all have the "semi-osccilateing" signiture: vary narrow width with a small crossing.  There's also some type of ringing afterwards.  Note that this signal still exists when HV is removed. 
<!-- Date: Wed Nov 10 14:58:15 2004 -->
Update on movement of steel and such: west toroid is out (both halves) so we'll shimmy up to the keystone and remove radekas as need be.  Rob plans on moving the miniskirts back into position Thursday at 8:30 [11/11].  The SW arch should be moved in soon.
<!-- Author: Dale and Ingyin -->
<!-- Comment: Fri Nov 12 15;27;24 comment by...Dale and Ingyin -->
The arches remain out in the west and NE to allow access to crates, etc.
<p>
<a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=5&frame=2&anchor=18:05:34'>
Via our previous measurements which we were able to protect and maintain</a> we along with <a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=787&frame=2&anchor=16:58:07.151'>
the usual cast of characters</a> were able to move the miniskirts back to their nominal spots.  For sure the SE, NE, SW are within +/- 1 cm of the measure position while the NW (because of the Si cooling) is about a cm out from what we measured [but it was about this distance before so we expect everything to be back in place].
</p>
We'll push to have the SW and NW arches pulled back in as soon as possible.  We still have to do our keystone position measurements and also pull 3 radekas [<a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=13:53:23'>see above</a>] from the overlap region.  Both of these actions are passive but we would like to be done with CMX as soon as possible.
<!-- Date: Fri Nov 12 09:42:41 2004 -->
<pre>We tried to calibrate the radekas with the calibration test pulse. We tried to look at the signal with a scope but the modified radekas absorb the signal and we could not see anything.</pre>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Tue Nov 16 08;05;38 comment by...Dale -->
see entry below
<!-- Date: Sun Nov 14 18:17:56 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-352&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-352' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-353&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-353' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-354&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-354' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-355&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-355' width='300'></a></center>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Sun Nov 14 18;34;52 comment by...Dale and Ingyin -->
<pre>Here are some scope traces when we tried the CALIB_CMX_SCOPE.  Note that the Muon calibration is empty (or random noise) for the areas where the new radekas are at.  However, we (after Lucio's suggestion in the muon reconstruction meeting) thought to check to see if the signal was just attenuated but still useful for our calibration purposes.  

1.  This is the Test Pulse signal (at the preamp board), basic square wave.

2.  This is the Test Pulse but unzoomed to show the peroid of the square wave signal.

3.  This is the signal from the preamp board via an old-style radeka.  Notice the d/dx responce and the already greatly attenuated amplitude.

4.  This is the (non-) signal from a modified preamp.  Note that we zoomed in, etc.; we didn't find anything.  Bottom line is this just won't work.</pre>



<!-- Date: Thu Nov 18 15:43:46 2004 -->
Summary of work noted <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=802&frame=2&anchor=15:42:02.979'> 
in the shift e-log</a>.  More details to come.
<!-- Author: Dale and Ingyin -->
<!-- Comment: Thu Nov 18 16;39;41 comment by...Dale and Ingyin -->
The work on the overlap area was to 
<p>
1.) fix the (realtively minor) problem that the width on the one suspect channel [see <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=13:53:23'>TDC 43 or YMon 47 above</a>] while having normal occupancy and hit multiplicity, had too long of a width.
</p>
<p>and 2.) take out the radekas out of the 3 semi-oscilating channels and see if old style radekas could be swaped back in stack 0 of wedge 7.
</p>
Results:
<p>
as for 1.) we switched radekas (the one "normal" channel with the suspect one).  We found that the width being overtly large [~700 ns width compared to ~300 ns for a 'typical' modified radeka].  Perhaps more imporantly we observed that this channel was semi-occilating with the switched radeka.  We put two and two togther and figured that the radeka that was orginally in YMon # 47 was a <b>super</b> radeka.  When we took it out we saw that one of the brown thing-ees was off - almost for sure a resistor.    We removed this radeka from action and put it on our CMX table in the assembly hall and labled it as "super".  
</p><p>
2.)  We found that taking our the two bad radekas of preamp 7-00 that overlap to wedge 6 and replacing all the radekas in the 1st stack for wedge 7 cause the wedge to osccilate.  We tooked out the signal cable for 7-00 and the osccilation stoped.  Ingyin conviced Dale to place the modified radekas back (for the normal 6 channels in that stack).  As a result, we now have no occilations (semi or otherwise) and have gained 3 new channels [1 wedge 6, 2 wedge 7] with a faint hope of recovering the 4 in the cross-over in another shutdown.  For now we are going to keep what we have (note that the SW arch is not closed so we could always test what happens in this configuration).
</p>
We looked at all the signals via the TDC crates - we'll (hopefully) find time to make a dead (or funky signal) channel list. We took snap-shots via the scope and will post the weird signals as well.


<!-- Date: Fri Nov 19 15:27:05 2004 -->
Update:  
<p>Measured the position of the keystone for wedge 6.  May have to crunch the numbers to really make sure that we did all that we needed to.  Still need to make a measurement of wedge 5 (NW can be left out for this).  May also make a refrence measurement to wedge 4 or 7 if need be.</p> 
On a side note when the SW arch was moved back in Dale watch it close.  Ugly as all hell but everything closes without causing any problems (no strains, etc.).  
<!-- Author: Phil, Ingyin, and Dale -->


<!-- Date: Fri Nov 19 17:36:02 2004 -->
Darn. 
<p> 
SW 15 tripped (it was then reset and tripped again) <a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=804&frame=2&anchor=14:53:23.632'> 
as noted in the elog</a>.  Also note that it tripped eairlier in the day (when nobody was around in the control room).  I was able to recover it but I tripped it 3 more times [always on the cathode] before it stayied on.  The one time it was clearly drawing to much current, actually making it all the way up on the cathode and drawing over .8 mA on the current.  I told the aces to try to reset the trip up to once and to turn it off if it trips more than that. 
</p>   
Talked to Steve, he's very reluctant to give out keys over the weekend.  The bigger problem (?!?) is that waiting a few minutes was enough to make the problem go away.  We can try overvoltaging the wedge and by-pass the weak link.  In any event things are a bit too close to the end of the shutdown.
<!-- Author: Dale -->
<!-- Comment: Sun Nov 21 15;27;53 comment by...Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2004&action=view&page=808&frame=2&anchor=14:30:33.895'>
Missed it when it triped again in Friday.</a>  It came back when I reset it today.


<!-- Date: Mon Nov 22 08:50:12 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-356&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-356' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-357&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-357' width='300'></a></center>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Mon Nov 22 08;58;46 comment by...Dale and Ingyin -->
<pre>Captures of the SW HV.  Notice that SW 16-17 [30 degrees] is (in this case) undervoltage.  We've notice this before and blamed it on some weird sequence of turning CMX/the wedge off/on with the HV summary or the CMX detector bars.

In the first its normal - haven't touch anything.  The 2nd capture is after we switched the HV cables at the pod (notice the current values swapped).  The problem doesn't follow the switch so we blame iFIX / HVMon++ / CAEN.  

What we would really like is just for the HV value to go back to normal.  Might play around for a bit but may ask more knowledgeable sources.  Note: the cables are switched back to the normal configuration/mapping.</pre>


<!-- Comment: Mon Nov 22 11;54;57 comment by...phil -->
<pre>Note that the top line is the set value, the voltage at the bottom is the actual.</pre>
<!-- Comment: Mon Nov 22 11;58;45 comment by...phil -->
see <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=11:55:33'>
entry below</a> 
<!-- Comment: Mon Nov 22 17;49;11 comment by...Dale + Ingyin -->
<pre>Yep, should say that the "set point" voltage is undervoltage - the nominal (most of the time) is that the wedge is at the right voltage.

In other news, Ingyin notice that the Keystone (6) is drawing way too much current.  Way too much.  No idea how.</pre>
<!-- Comment: Sun Dec  5 21;10;53 comment by...Dale and Ingyin -->
A bit to late for us to think - <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=10:03:21'>
the problem and solution found below</a>.
<!-- Date: Mon Nov 22 11:09:00 2004 -->
<center><a href='/elog/notebooks/cmx/Mon_Nov_22_2004_110757.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-365' ></a><a href='/elog/notebooks/cmx/Mon_Nov_22_2004_110816.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-367' ></a><a href='/elog/notebooks/cmx/Mon_Nov_22_2004_110826.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-369' ></a></center>
<!-- Author: ps -->
<!-- Comment: Mon Nov 22 11;10;59 comment by...phil -->
<pre>the trigger in 7W is hot; it there are some high occupancy cyannels, but the don't seem to be oscillating (note the occupancy is high but not 1 and the widths don't look anomalous)</pre>



<!-- Date: Mon Nov 22 11:55:33 2004 -->
<pre>It gets wierder. I clicked the on button for this channel and the set point is now right, but the actual is coming back 38 V high. Before the set value was 38 V low, the actual was right on.</pre>
<!-- Author: phil -->
<!-- Comment: Mon Nov 22 11;56;58 comment by...phil -->
<pre>the was a comment on the &lt;a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=08:50:12'&gt;
entry above&lt;/a&gt;</pre>

<!-- Comment: Mon Nov 22 11;57;49 comment by...phil -->
try again:  this was a comment on the <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=08:50:12'>
entry above</a>


<!-- Comment: Mon Nov 22 13;57;06 comment by...phil -->
<pre>now it's more like before, 5363 on the set, 5400 on the actual</pre>

<!-- Comment: Mon Nov 22 14;52;40 comment by...Dale -->
Yes, I seen this as well.  It "corrects" the HV by setting to a lower point - or that's what one would say looking at it for the first time.  What options are avaible to check this out?

<!-- Comment: Mon Nov 22 15;20;19 comment by...phil -->
<pre>try reading it out from the front panel? let me know if you haven't done this before</pre>

<!-- Comment: Mon Nov 22 17;02;01 comment by...Dale and Ingyin -->
The CAEN gives the exact same information.  The value read is 5.4 kV while the set is at 5.36 kV.  As long as the real value is in the right spot everything is ok but we need to look out for how often/long it might go high as noted by Phil above.



<!-- Date: Tue Nov 23 08:24:17 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-370&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-370  width='300' align='top'></a></td><td>Vidim must have needed to run some special runs as the owl shift is choped up with runs.  Things to note: wedge 6 was at stand-by.  Seems to be an odd occurancy of noise in 6 and also channels where there are no physical chambers SW 15 and 20 for example.  The Hit multiplicity on the west in general looks bad.  The start times were all messed up and peaked at a value (we'll include later).  -  We're going down to start debuging.  We have until 15:00 today to have something "working/well understood".</td></tr></table>
<!-- Author: Dale and Ingyin -->
<!-- Comment: Wed Nov 24 08;59;34 comment by...Dale -->
What's happening?
<p>I see the same "effect" in run 190156 (the run started right after the nice plots below).  The occupancy where the ~8 multiplicity happens is small.  It's like a "sudden" effect.  In both cases the effect is on the west.  In particular both show hits in the non-physical region of SW wedge 15 and hits have low start times.
</p>Electrical noise?  Something happens to the TDC crate?  400Hz LV noise?
<!-- Date: Tue Nov 23 10:03:21 2004 -->
Update: 
<p> 
We think we found the problem (and fix it) for wedge 6 drawing to much current and having "bad" signals.  Long story short the cathode (drift) HV jumper between wires 5 and 3 in stack 5 HV voltage lead was out.  The obvious conclusion is that Dale must have snagged it when we took measurements for the keysote on Friday.  In retrospect, we did notice (but should have focused more on it) that the cathode was drawing around .35 mA not .4 mA.  We replace the jumper, and the anode now draws ~.5 microA (as it should) and around .40 mA on the drift.   
</p> 
Looking at the signals in wedge 6 everything is fine.  Signals look normal.  They just started a new cosmic run.  No show stoppers (no obvious hot channels or high multiplities in wedge 7).
<!-- Author: Dale and Ingyin -->


<!-- Date: Wed Nov 24 08:41:11 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-371&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-371' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-372&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-372' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-373&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-373' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-374&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-374' width='300'></a></center>
<!-- Author: Dale -->
<!-- Comment: Wed Nov 24 08;49;52 comment by...Dale and Ingyin -->
Overall things look good.  No obvious problems, etc, but requires a bit more study.  More stats would make me feel better - we'll ask for this over thanksgiving.  We'll do a channel by channel check with a long cosmic run from last year (after the 2003 shutdown) and the data collected here.



<!-- Date: Wed Nov 24 15:44:48 2004 -->
At some level the shutdown is offically over (<a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=814&frame=2&anchor=13:41:52.786'>Search and secure finished</a>) but beam / collisions will occur around or after Dec. 7.
<!-- Author: Dale and Ingyin -->


<!-- Date: Thu Dec 2 08:08:57 2004 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-375&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-375' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-376&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-376' width='300'></a></center>
<!-- Author: Dale -->
<!-- Comment: Thu Dec  2 08;17;53 comment by...Dale -->
Just about time for a new log-book page but first:
<p>From run # <a href= 'http://www-cdfonline.fnal.gov/java/cdfdb/servlet/RunSummary?RUN_NUMBER=190436190436'>190436  </a> (cosmic run).  The basic thing here is that I looked at the muon slide via the web and saw that CMX had ~ the right occupancy.  I susspected that the HV should be at stand-by (the other detectors looked as such).  Sure enough CMX was at stand-by and exibit a odd behavior. I suspect this is like <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=7&frame=2&anchor=08:24:17'>
above</a>.  Definately some sort of noise.  
</p>

<!-- Comment: Thu Dec  2 09;36;34 comment by...Dale -->
Messed up on the link to the run #.  This should work: <a href = 'http://www-cdfonline.fnal.gov/java/cdfdb/servlet/RunSummary?RUN_NUMBER=190436'> 190436</a>


<!-- Date: Fri Dec 3 15:35:28 2004 -->
<a href= 
'/cgi/elog/elog.pl?nb=2004&action=view&page=836&frame=2&anchor=15:13:17.952'> 
Eric added 52.5ns to the width of the trigger timing gate</a> 
for West CSX mini-skirt channels.
<!-- Author: Dale -->



<!-- Date: Sun Dec 12 11:24:47 2004 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-377&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-377  width='300' align='top'></a></td><td>Occupancy plot durning the end of a physics run. Note: hot channel in wedge 5 does not increase the (low pt) trig-mon plot.  Need to look at this in more detail.  Also need to double check miniskirt and look at the areas where there are 4 or more holes together</td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Sun Dec 12 12;13;48 comment by...Dale -->
via run <a href= 'http://www-cdfonline.fnal.gov/java/cdfdb/servlet/RunSummary?RUN_NUMBER=190936'> 190936</a> which was almost 9 hours long.