<!-- Title: 19:03:49  Mon Aug 28 2006 -->
<!-- Crewchief: Dale Stentz (NWU) -->
<!-- Op1: John Strologas (NM) -->
<!-- Op2: Andrew Kubik (NWU) -->
<!-- Op3: Phil Schlabach (FNAL) -->
<!-- Op4: the many gone -->
<!-- Op5: but not forgotten -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
<h3>Welcome to the CMX e-log</h3> 
<br> 
Time for a new page...


<!-- Date: Mon Aug 28 19:11:45 2006 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-471&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-472  width='300' align='top'></a></td><td>iFIX west anode channel 4 (this is actually iFIX wedge 6 <i>or, better yet,</i> physical wedge 6+10).<br><br> 
I think this is the new bread winner since the shutdown as far as current drawing.<br><br> 
All the settings are 100 microA (except for the miniskirts which are still 40) - entry on this action to follow (if I remember).  It looks like we can take 250 without adjusting anything.  Should likely up settings a bit more for channels like this.  Note that 400E30 gets us (using the quad fit) to ~165 microA - safe bet that we won't ever hit the hardware (true) limit of 200.</td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Mon Aug 28 19;22;10 comment by...Dale -->
Current limit changes: as stated before the software warning limit is at 100 for the non-miniskirt wedges.  Changes were made in iFIX via poping up the needed anode channels.  A more systmatic way to change is to modify the actual *.db files (good idea to make a backup copy).  The iFIX channel map to iFIX wedge map is given (via the muon channel map page) <a href= 'http://www-cdfonline.fnal.gov/ops/cdf_muon/maps/cmxtoifix.pdf'>here (pdf)</a>.
 


<!-- Date: Tue Aug 29 21:23:31 2006 -->
Before it get barried below, here's John's very useful miniskirt HV map:<br><br> 
<a href= 'http://www-cdf.fnal.gov/internal/people/links/JohnStrologas/cmx/miniskirt.eps'>miniskirt.eps</a>
<!-- Author: John and Dale -->


<!-- Date: Thu Aug 31 13:40:33 2006 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-473&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-473  width='300' align='top'></a></td><td>ACNET varibles (all west wedges): MUHVC1 13-14, MUHVC5 = 21, HUHVC6 = 7-8<br><br><br> 
Run # <a href = 'http://www-cdfonline.fnal.gov/java/cdfdb/servlet/RunSummary?RUN_NUMBER=222413'>222413</a> shows that the drop in [iFIX] 21 (which is saturated) reversed the current between CMX trips on [iFIX] 22-23. 
</td></tr></table>
<!-- Author: Dale -->


<!-- Date: Mon Sep 4 08:22:55 2006 -->
I got paged <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=642&frame=2&anchor=04:20:57.761'> 
near the end of a previous store</a> when CMX went bad.  More trips <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=643&frame=2&anchor=13:13:24.687'> 
here</a> and elsewhere.  The take away point is that there are trips on NW and NE 22-23.  <br><br> 
I've made a tally of the trips: 
<br><br>6 trips on the west iFIX 22-23 [via CAEN pod channel 6] which we know as physical wedges 3+21.  Trips are aways on the anode and (for this set) didn't take the cathode down. 
<br><br>11 trips on East 22-23 [via CAEN pods 24/28].  Trips generally take out both the drift and anode although previous trips have (fairly consistantly) take out just the anode. 
<br><br>I've changed the trip time on the NE to match Phil's setting on the NW 22-23.  Note that I plan to switch the HV cables at the back of the CAEN if for no other reason then to reduce confusion over which side/wedges are tripping.  The west is the obvious canidate given the cable switch at the patch pannel in B0 but I haven't done the switch for the east CAEN and thus haven't ruled out a CAEN problem there.
<!-- Author: Dale -->
<!-- Comment: Mon Sep  4 08;23;49 comment by...D -->
<pre>(Trip time is now = 1 second vs. 0 seconds by default.)</pre>


<!-- Date: Thu Sep 7 08:16:58 2006 -->
<h4>Long overdue access report on CMX SE miniskirt (east iFIX 16-17)</h4> 
The HV problem on the SE miniskirt wedge 17 is noted  
<a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=10&frame=2&anchor=07:34:51'>here</a>.  First sign of trouble was ~14:00 while an access was taken place.    As we later found out the issue was likely related to a dripping ISL water cooling pipe.<br><br> 
<a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=619&frame=2&anchor=08:30:15.986'>The summary in the e-log</a> when we made our first access (8-23).  We found no obvious sign of damage and eliminated the cable/connection as being a problem.  At the time the suspect was the SHV-to-jumper connection.  The tripping section was easy to track down; it was the 4th 5 degree section (counting in order with phi).  This is the one that "stradles" two wedges (it has the last stack of wedge 16 and the 1st of 17).  It was by-passed and an access planned later to open up the cover with the toroid removed.<br><br> 
The 2nd access on this section/problem happend on 8/31 with the <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=633&frame=2&anchor=07:00:00.085'> 
e-log summary posted here</a>.  By this time we had not only piece together this is where the silicon folk were doing their tests (we knew this on the previous access) but that the ISL cooling line were dripping water (and signs seem to be pointing to the SE section).  The leak was spotten and the silicon folk describe their work in <a href= 
'/cgi/elog/det-system-elog.pl?nb=silicon&action=view&page=316&frame=2&anchor=07:01:40'>their on e-log</a>.<br><br> 
While the leak was being fixed we focused on finding the HV problem.  The jumper was quickly confirmed not to be the proper and there was definately no signs of "crushing" or the alike to suggest that the section was damaged physically during the intinal trip mentioned in the intro.  We ended up finding two bad chambers.  The first was wedge 17, stack 0, wire 1.  This was the chamber where the SHV-to-jumper connector entered and attached to.  It had the exact same conditions as noted before the isolation: a crazy current draw ("linear") so that a small voltage mapped directly to a high current draw.  There was another problem after this chamber was by-passed.  Wedge 17, stack 0, wire 0 showed high (but steady) current draw.  Alone it was ~.31 mA [current on the drift] and together with the rest of the 5 degrees it was ~.40 - about what a full 15 degree wedge would draw.  It didn't seem to be very "tripy" but there was no way we could keep this chamber and not potentially expect major problems.  It also not clear if the high current might have been some stable short that would have the channel ineffective for data taking.  Note however this chamber (more than the 1st) might be recoverable.<br><br> 
With both chambers (17:0:1 and 17:0:0) were by-passed with everything re-connected and closed up.  The configuration in the SE miniskirt (iFIX 15 + 16-17) is the nominal 15/15.  Note that there have not been any HV problems in the area since.  
<!-- Author: Dale and John -->


<!-- Date: Thu Sep 7 08:38:05 2006 -->
Update on trips on the arches (often reported as East and West 22-23):<p> 
This is in continuation of the <a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=10&frame=2&anchor=13:35:46'> 
entries in the previous CMX e-log pages</a>.  NW iFIX 22-23 is still really wedge 21 (which is physical wedges 3+21).  The cable switch is at the patch pannel - namely the cables that run from the NW arche's panel to the wedges are switch.</p><p>We started to get trips on the NE at the same iFIX wedge/channel so Dale decided to test/check the CAEN pod (however unlikely) and also put the trip elsewhere to avoid confusion on the shift crew. 
</p> 
With the best of intentions I attempted to switch during a silicon d-mode calibration.  There isn't a whole lot of give in thoes SHV cables and the anode for the already suspect NE 22-23 had it connection stripped off by Dale.  The details are explained <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=646&frame=2&anchor=11:38:13.458'> 
here</a>.  Evendently brute force was the short term solution but luckly the techs were able to re-terminate the cable as noted <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=649&frame=2&anchor=12:06:30.453'> 
here</a>.<br><br> 
I left the cable switched and there have been a few trips on NE 0-1 rather than 22-23 [these are the iFIX wedges].  This passes the blame away from the CAEN and makes the cable connection (by-itself) an unlikely suspect.<br><br> 
Needless to say we may look to go in and switch things back to their default configuration.  Certainly we have not done the test of the cable swap at the wedge level to be certain that the problem is isolated to the wedge/detector and not the cable.
<!-- Author: Dale and Phil -->
<!-- Comment: Fri Sep 22 13;56;45 comment by...Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2006&action=view&page=700&frame=2&anchor=13:43:08.428'>The NE cables have been switched back.</a>  Now iFIX 0-1 is the low current drawer being hooked up to wedge 1.  iFIX 22-23 is back to physical 23-0.  Note the trip log shows no trips on either of these fellows for the last +2 weeks.


<!-- Date: Wed Sep 27 13:16:15 2006 -->
Yesterday we went in and worked on the HV configuration in the NE 
miniskirt and the NW arch.&nbsp; See the <a 
href="/cgi/elog/elog.pl?nb=2006&amp;action=view&amp;page=712&amp;frame=2&amp;anchor=11:03:10.935">e-log 
summary here</a>.<br> 
<ul> 
<li>NE miniskirt work: <br> 
iFIX wedge 18-19 has been tripping off and on for the last month or 
so.&nbsp; This is actually the last 5/6 of the NE miniskirt.&nbsp; It 
was left in a rather complex configuration as described <a 
href="/cgi/elog/det-system-elog.pl?nb=cmx&amp;action=view&amp;page=10&amp;frame=2&amp;anchor=10:42:06">here</a>.&nbsp; 
We reconfigured the wedge to be 15/15 and made the additional switch 
back 
so that the only remaining original cable was in the correct 
spot.&nbsp; 
Here is an update of the table via the previous link:</li> 
<pre> HV Channel:     NE iFIX 18-19        NE iFIX 20 
============================================================ 
physical area:  1st half ("18")     2nd half ("19") 
drift cable:    SPARE HV NE 1       NE CM-NE-DRIFT 1 
anode cable:    SPARE HV NE 3       NE ANODE 7 [original] 
============================================================</pre> 
There has been one trip on NE 20 <a 
href="/cgi/elog/elog.pl?nb=2006&amp;action=view&amp;page=715&amp;frame=2&amp;anchor=11:42:10.518">as 
noted here</a> which would point to the upper (2nd) phi section.<br> 
<br> 
<li>NW arch work:<br> 
We effectively switched the cables that connects from the patch panel 
in the arch to CMX wedges 21(+3) and 22-23.&nbsp; Previous work (e.g. <a 
href="/cgi/elog/det-system-elog.pl?nb=cmx&amp;action=view&amp;page=10&amp;frame=2&amp;anchor=13:35:46">here</a>) 
describes the previous test we have done here.&nbsp; Basically we have 
narrowed the problem down to the previous mentioned SHV cable (it would 
be the anode associated with wedge 21 or NW cable #2) or wedge 3.&nbsp; 
The previous set of test show that 21 with 22-23 is fine and we have 
already tried a replacement cable for the inter-cable connection 
between 21 and 3.<br> 
<br> 
The work required that we take the pair of cables that went to 21 (#2) 
and "snaked" it up to the start of wedge 22.&nbsp; We thus had to 
reverse the resistor box and SHV 'T' connection so that these would 
start at 22 and go up to 23 and not the other way around.&nbsp; We used 
a spare pair of SHV cables (we believe we took this one during the last 
shutdown from between wedges 2 and 3 of the same arch) to jump from the 
end of cable #3 (normally for 22-23) to 21.&nbsp; The extra pair of 
cables also required a pair of SHV "barrels" to connect both cables.<br> 
<br> 
The setup is relatively clean and easy to access but may take a good 
look to figure out what has been done.&nbsp; Note that we did not 
unswitch the cables at the patch panel (2 and 3 are switched there as 
well).&nbsp; This means trips should naturally associate with the 
physical wedge due to the "double switch".&nbsp; Trips on iFIX 21 would 
seem to uniquely point to a trip in wedge 3 while (however unlikely) 
trips on iFIX 22-23 suggest that the cable was at fault.<br> 
<br> 
</li> 
<li>In other news the SW arched was open and closed without much 
fan-fair.&nbsp; Opening should almost never be an issue and closing 
seems painless the last 4 or so times.</li> 
</ul>
<!-- Author: Phil, Andy, and Dale -->


<!-- Date: Mon Oct 2 09:29:48 2006 -->
There's been one <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=729&frame=2&anchor=04:29:11.987'>additional trip</a> on NE 20 (see the entry above).  That's only 2 trips in a span of 3.5 days - needless to say we will keep it in this configuration until it becomes more problematic.  The plan would be to go with a 20/10  configuration.
<!-- Author: Dale -->


<!-- Date: Fri Oct 6 11:29:39 2006 -->
Current Study and suggested current limits for Lum = 275:<br> 
<table 
style="text-align: left; width: 867px; height: 410px; margin-left: auto; margin-right: auto; font-family: monospace;" 
border="0" cellpadding="3" cellspacing="3"> 
<tbody> 
<tr> 
<td style="text-align: left; vertical-align: middle; width: 42%;"> 
<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8"> 
<title></title> 
<meta name="GENERATOR" content="OpenOffice.org 1.1.2 (Linux)"> 
<table border="1" cellspacing="0" cols="5" frame="box" 
rules="groups"> 
<colgroup><col width="49"></colgroup> <colgroup><col width="75"></colgroup> 
<colgroup><col width="86"></colgroup> <colgroup><col width="86"></colgroup> 
<colgroup><col width="86"></colgroup> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="19" width="49">Side</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="75">iFIX channel</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="86">Current (275)</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="86">iFIX wedge</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="86">Physical Wedge</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">East</td> 
<td sdval="3" sdnum="1033;" align="center" bgcolor="#ff3333">3</td> 
<td sdval="101.5" sdnum="1033;" align="center" 
bgcolor="#ff3333">101.5</td> 
<td sdval="4" sdnum="1033;" align="center" bgcolor="#ff3333">4</td> 
<td align="center" bgcolor="#ff3333">3-4</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">West</td> 
<td sdval="4" sdnum="1033;" align="center" bgcolor="#ff3333">4</td> 
<td sdval="95" sdnum="1033;" align="center" 
bgcolor="#ff3333">95</td> 
<td sdval="6" sdnum="1033;" align="center" bgcolor="#ff3333">6</td> 
<td align="center" bgcolor="#ff3333">6+10</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">East</td> 
<td sdval="10" sdnum="1033;" align="center" 
bgcolor="#ff3333">10</td> 
<td sdval="90" sdnum="1033;" align="center" 
bgcolor="#ff3333">90</td> 
<td align="center" bgcolor="#ff3333">22-23<br> 
</td> 
<td align="center" bgcolor="#ff3333">0-23</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">West</td> 
<td sdval="1" sdnum="1033;" align="center" bgcolor="#ff3333">1</td> 
<td sdval="86" sdnum="1033;" align="center" 
bgcolor="#ff3333">86</td> 
<td align="center" bgcolor="#ff3333">0-1</td> 
<td align="center" bgcolor="#ff3333">0-1</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">West</td> 
<td sdval="9" sdnum="1033;" align="center" bgcolor="#ff3333">9</td> 
<td sdval="84" sdnum="1033;" align="center" 
bgcolor="#ff3333">84</td> 
<td align="center" bgcolor="#ff3333">21<br> 
</td> 
<td align="center" bgcolor="#ff3333">21+3</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">West</td> 
<td sdval="7" sdnum="1033;" align="center" bgcolor="#ff3333">7</td> 
<td sdval="83.5" sdnum="1033;" align="center" 
bgcolor="#ff3333">83.5</td> 
<td sdnum="1033;0;MM/DD/YY" align="center" bgcolor="#ff3333">11-12</td> 
<td sdnum="1033;0;MM/DD/YY" align="center" bgcolor="#ff3333">11-12</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">East</td> 
<td sdval="4" sdnum="1033;" align="center" bgcolor="#ff3333">4</td> 
<td sdval="80" sdnum="1033;" align="center" 
bgcolor="#ff3333">80</td> 
<td sdval="7" sdnum="1033;" align="center" bgcolor="#ff3333">7</td> 
<td align="center" bgcolor="#ff3333">7-8</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">East</td> 
<td sdval="7" sdnum="1033;" align="center" bgcolor="#ff3333">7</td> 
<td sdval="77.5" sdnum="1033;" align="center" 
bgcolor="#ff3333">77.5</td> 
<td sdnum="1033;0;MM/DD/YY" align="center" bgcolor="#ff3333">12-13</td> 
<td align="center" bgcolor="#ff3333">11-12</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff8d00" height="18">East</td> 
<td sdval="8" sdnum="1033;" align="center" bgcolor="#ff8d00">8</td> 
<td sdval="70.5" sdnum="1033;" align="center" 
bgcolor="#ff8d00">70.5</td> 
<td sdval="14" sdnum="1033;" align="center" 
bgcolor="#ff8d00">14</td> 
<td align="center" bgcolor="#ff8d00">13-14</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff8d00" height="18">East</td> 
<td sdval="9" sdnum="1033;" align="center" bgcolor="#ff8d00">9</td> 
<td sdval="62.5" sdnum="1033;" align="center" 
bgcolor="#ff8d00">62.5</td> 
<td sdval="21" sdnum="1033;" align="center" 
bgcolor="#ff8d00">21</td> 
<td align="center" bgcolor="#ff8d00">21-22</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff8d00" height="18">West</td> 
<td sdval="3" sdnum="1033;" align="center" bgcolor="#ff8d00">3</td> 
<td sdval="58.5" sdnum="1033;" align="center" 
bgcolor="#ff8d00">58.5</td> 
<td align="center" bgcolor="#ff8d00">4-5</td> 
<td sdnum="1033;0;MM/DD/YY" align="center" bgcolor="#ff8d00">4-5</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#e6ff00" height="18">West</td> 
<td sdval="2" sdnum="1033;" align="center" bgcolor="#e6ff00">2</td> 
<td sdval="48.5" sdnum="1033;" align="center" 
bgcolor="#e6ff00">48.5</td> 
<td align="center" bgcolor="#e6ff00">2-3</td> 
<td sdval="2" sdnum="1033;" align="center" bgcolor="#e6ff00">2</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#e6ff00" height="18">East</td> 
<td sdval="2" sdnum="1033;" align="center" bgcolor="#e6ff00">2</td> 
<td sdval="48" sdnum="1033;" align="center" 
bgcolor="#e6ff00">48</td> 
<td align="center" bgcolor="#e6ff00">2-3</td> 
<td sdval="2" sdnum="1033;" align="center" bgcolor="#e6ff00">2</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#e6ff00" height="18">East</td> 
<td sdval="6" sdnum="1033;" align="center" bgcolor="#e6ff00">6</td> 
<td sdval="46" sdnum="1033;" align="center" 
bgcolor="#e6ff00">46</td> 
<td align="center" bgcolor="#e6ff00">10-11</td> 
<td sdval="10" sdnum="1033;" align="center" 
bgcolor="#e6ff00">10</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#e6ff00" height="18">East</td> 
<td sdval="5" sdnum="1033;" align="center" bgcolor="#e6ff00">5</td> 
<td sdval="45" sdnum="1033;" align="center" 
bgcolor="#e6ff00">45</td> 
<td align="center" bgcolor="#e6ff00">8-9</td> 
<td sdval="9" sdnum="1033;" align="center" bgcolor="#e6ff00">9</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#e6ff00" height="18">East</td> 
<td sdval="1" sdnum="1033;" align="center" bgcolor="#e6ff00">1</td> 
<td sdval="45" sdnum="1033;" align="center" 
bgcolor="#e6ff00">45</td> 
<td align="center" bgcolor="#e6ff00">0-1<br> 
</td> 
<td sdval="1" sdnum="1033;" align="center" bgcolor="#e6ff00">1</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#3deb3d" height="18">West</td> 
<td sdval="5" sdnum="1033;" align="center" bgcolor="#3deb3d">5</td> 
<td sdval="24" sdnum="1033;" align="center" 
bgcolor="#3deb3d">24</td> 
<td align="center" bgcolor="#3deb3d">7-8</td> 
<td align="center" bgcolor="#3deb3d">7-8</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#3deb3d" height="18">West</td> 
<td sdval="10" sdnum="1033;" align="center" 
bgcolor="#3deb3d">10</td> 
<td sdval="23" sdnum="1033;" align="center" 
bgcolor="#3deb3d">23</td> 
<td sdval="21" sdnum="1033;" align="center" 
bgcolor="#3deb3d">22-23</td> 
<td align="center" bgcolor="#3deb3d">22-23</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#3deb3d" height="18">West</td> 
<td sdval="8" sdnum="1033;" align="center" bgcolor="#3deb3d">8</td> 
<td sdval="18.5" sdnum="1033;" align="center" 
bgcolor="#3deb3d">18.5</td> 
<td align="center" bgcolor="#3deb3d">13-14</td> 
<td align="center" bgcolor="#3deb3d">13-14</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#3deb3d" height="18">West</td> 
<td sdval="6" sdnum="1033;" align="center" bgcolor="#3deb3d">6</td> 
<td sdval="4.5" sdnum="1033;" align="center" 
bgcolor="#3deb3d">4.5</td> 
<td align="center" bgcolor="#3deb3d">9-10</td> 
<td sdval="9" sdnum="1033;" align="center" bgcolor="#3deb3d">9</td> 
</tr> 
</tbody> 
</table> 
</td> 
<td style="text-align: center; vertical-align: middle;"> 
<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8"> 
<title></title> 
<meta name="GENERATOR" content="OpenOffice.org 1.1.2 (Linux)"> 
<table border="1" cellspacing="0" cols="2" frame="box" 
rules="groups"> 
<colgroup><col width="75"></colgroup> <colgroup><col width="86"></colgroup> 
<tbody> 
<tr> 
<td 
style="text-align: center; background-color: rgb(255, 255, 255);" 
height="18" width="75">Range</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="86">Limit (275)</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff3333" height="18">Hot</td> 
<td sdval="105" sdnum="1033;" align="center" 
bgcolor="#ff3333">105</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#ff8d00" height="18">Warm</td> 
<td sdval="75" sdnum="1033;" align="center" 
bgcolor="#ff8d00">75</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#e6ff00" height="18">Mild</td> 
<td sdval="55" sdnum="1033;" align="center" 
bgcolor="#e6ff00">55</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td align="center" bgcolor="#3deb3d" height="18">Cool</td> 
<td style="text-align: center;" sdval="30" sdnum="1033;" 
bgcolor="#3deb3d">30</td> 
</tr> 
</tbody> 
</table> 
<br> 
</td> 
<td 
style="text-align: center; vertical-align: middle; width: 36%;"> 
<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8"> 
<title></title> 
<meta name="GENERATOR" content="OpenOffice.org 1.1.2 (Linux)"> 
<table border="1" cellspacing="0" cols="4" frame="box" 
rules="groups"> 
<colgroup><col width="49"></colgroup> <colgroup><col width="75"></colgroup> 
<colgroup><col width="86"></colgroup> <colgroup><col width="86"></colgroup> 
<tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="19" width="49">Side</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="75">iFIX channel</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="86">Limit (275)</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" width="86">Range</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="1" 
sdnum="1033;" align="center">1</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="2" 
sdnum="1033;" align="center">2</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="55" 
sdnum="1033;" align="center">55</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Mild</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="3" 
sdnum="1033;" align="center">3</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="75" 
sdnum="1033;" align="center">75</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Warm</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="4" 
sdnum="1033;" align="center">4</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="5" 
sdnum="1033;" align="center">5</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="30" 
sdnum="1033;" align="center">30</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Cool</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="6" 
sdnum="1033;" align="center">6</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="30" 
sdnum="1033;" align="center">30</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Cool</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="7" 
sdnum="1033;" align="center">7</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="8" 
sdnum="1033;" align="center">8</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="30" 
sdnum="1033;" align="center">30</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Cool</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="9" 
sdnum="1033;" align="center">9</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">West</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="10" 
sdnum="1033;" align="center">10</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="30" 
sdnum="1033;" align="center">30</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Cool</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="1" 
sdnum="1033;" align="center">1</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="55" 
sdnum="1033;" align="center">55</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Mild</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="2" 
sdnum="1033;" align="center">2</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="55" 
sdnum="1033;" align="center">55</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Mild</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="3" 
sdnum="1033;" align="center">3</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="4" 
sdnum="1033;" align="center">4</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="5" 
sdnum="1033;" align="center">5</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="55" 
sdnum="1033;" align="center">55</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Mild</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="6" 
sdnum="1033;" align="center">6</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="55" 
sdnum="1033;" align="center">55</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Mild</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="7" 
sdnum="1033;" align="center">7</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="8" 
sdnum="1033;" align="center">8</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="75" 
sdnum="1033;" align="center">75</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Warm</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="9" 
sdnum="1033;" align="center">9</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="75" 
sdnum="1033;" align="center">75</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Warm</td> 
</tr> 
</tbody> <tbody> 
<tr> 
<td style="background-color: rgb(255, 255, 255);" 
align="center" height="18">East</td> 
<td style="background-color: rgb(255, 255, 255);" sdval="10" 
sdnum="1033;" align="center">10</td> 
<td style="background-color: rgb(255, 255, 255);" 
sdval="105" sdnum="1033;" align="center">105</td> 
<td style="background-color: rgb(255, 255, 255);" 
align="center">Hot</td> 
</tr> 
</tbody> 
</table> 
</td> 
</tr> 
</tbody> 
</table> 
<br> 
Note these settings have not been changed yet on the iFIX database (but hopefully will be soon).  The suggestion is to bump the currents up by an absolute amount as need by the increace in inst luminosity.
<!-- Author: Dale and Andy -->
<!-- Comment: Tue Oct 17 09;12;16 comment by...John and Dale -->
We finally changed the settings on the software current limits as <a href=
'/cgi/elog/elog.pl?nb=2006&action=view&page=775&frame=2&anchor=08:53:33.981'>
noted in the shift crew e-log</a>.  Using the 3rd table above we changed the software over-current (ON) values for each channel.  Note that we added 10 microA to each value to give a bit more breathing room before they need to be changed.  We did it by changing the db files themselves [CMXARWIREW.dat & CMXARWIREE.dat]  Things look good now but a high lum store will tell us if the settings are working out well and assigned correctly.

<!-- Comment: Tue Oct 24 19;43;33 comment by...Dale -->
West channel 10 (wedge 22-23) was double (triple?) switched with channel 9 (21+3).  Andy and Dale will short out the details but the 40 limit was switched with the 115 whiched caused 22-23 to show up as an over current.  Dale spotted it <a href=
'/cgi/elog/elog.pl?nb=2006&action=view&page=796&frame=2&anchor=15:05:39.385'>at the start of the store</a>.  The setting was changed and when the store fell out (quench) we had the monitoring ace <a href=
'/cgi/elog/elog.pl?nb=2006&action=view&page=797&frame=2&anchor=17:37:55.670'>
re-start</a> so the setting could take effect.

<!-- Comment: Tue Oct 31 09;21;16 comment by...Dale -->
I check the back of the CAEN and find that the cable/caen channel map is correct (no cable switches where).  [e.g. wedge 21+3 = caen 5 = cable #2]  Looking at the data I think that we just swapped the values.  Thus I will leave the settings as they are and keep the back of the CAEN as is.


<!-- Date: Tue Nov 14 15:08:04 2006 -->
The 10 degree miniskrt sections have been decomishioned.  The electronics that was on on the west side sections has been removed.  
<br><bR> 
Noteworthy were the 8 preamp boards.  Only one board had one of its signal wire damange.  All should be in working order although resodering a few joints and putting on some 'goup' on all might be in order if they are ever use in the hall.  Note that the preamps have been placed above the main locker for now. 
<br><br> 
Hopefully they will be going to a better place...
<!-- Author: Dale for Abraham -->


<!-- Date: Thu Dec 21 07:38:36 2006 -->
<pre>&lt;a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=954&frame=2&anchor=03:50:05.587'&gt;There was an over current on SW 9-10&lt;/a&gt; over the weekend.  I will up the limit from 40 to 65 microA. 
</pre>
<!-- Author: Dale -->
<!-- Comment: Thu Dec 21 07;42;39 comment by...D -->
<pre>actually I thought I caught this before it was entered...</pre>
<!-- Date: Thu Dec 21 07:41:55 2006 -->
<a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=954&frame=2&anchor=03:50:05.587'>There was an over current on SW 9-10 over the weekend.</a>  I will up the limit from 40 to 65 microA to the next "group".  
<!-- Author: Dale -->
<!-- Comment: Thu Dec 21 07;55;38 comment by...Dale and John -->
<a href=
'/cgi/elog/elog.pl?nb=2006&action=view&page=969&frame=2&anchor=07:46:08.954'>
HVMON++ restarted</a>; current settings updated.


<!-- Date: Thu Mar 8 08:09:22 2007 -->
Every few controled access there seems to be enough of a change in the HVAC conditions that warrents the miniskirts to trip off.  Having the HV fully on will help to meet the issue head on (having the HV on is our "standard procedure" when ever ISL/silicon folk work on the cooling lines around the miniskirt or work around there in general with the toroid pulled).<br><br> 
The most recent epsoide occured <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=191&frame=2&anchor=12:29:31.919'> 
March 5th</a>.  Trips were realtively frequent and bad enough that we couldn't get a wedge to stand-by.  In this case SW 15 and NE 20 were the trouble makers.  They did, with time, stablize.  The HVAC humdity values on average are very low but the access causes a rapid decrease followed but a correction upwards.<br><br> 
I think that there has also been a few periods where iFIX NW 21 [physical wedges 3+21] starts to trip off.  These trips are on the anode (sense) rather than the cathode (drift/field) as is the case for the miniskirts.  The trip rate is far below our threshold when it acts up.
<!-- Author: Dale -->


<!-- Date: Wed Mar 14 07:54:47 2007 -->
NE 20 has been going <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=217&frame=2&anchor=00:07:44.954'>crazy</a>. <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=217&frame=2&anchor=00:47:35.384'>John's plots</a> show an absolute 20% increase in the humidity and the same behavior in the dew point (the dew point temp was larger than the outside temp over-night).<br><br> 
From <a href= 
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=9&frame=2&anchor=15:01:58'>previous experances with this wedge</a>, one course of action would be to isolate the first full 5 degree section of wedge 19 (the 4th one in phi) from the rest of the miniskirt [the NE miniskirt should currently be in the normal 15/15 configuration].  This was sometime ago so a 20/10 option might be better for a first pass.  Access request will be in the works.  SW 15 and NW 20 also seem to have issues but are fine and haven't gone on a data killing spree like NE20.
<!-- Author: Dale -->
<!-- Comment: Wed Mar 21 13;00;15 comment by...Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=239&frame=2&anchor=12:34:32.920'>Another outbreak of trips</a>.  Put a nice plot of the humidity in.  Note that the effect seems to be more consistant with a radical change in the humidity, i.e. it wasn't just the high rel. humidty it was the high humidity on top of whatever HVAC change was taking place.<br><br>If time warrents I'll post a plot of the humidty a few hours from now.

<!-- Comment: Thu Mar 22 08;28;48 comment by...Dale -->
I posted an update plot <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=240&frame=2&anchor=16:12:10.043'>
here</a>.  The rising trend continued. I'm actually surprized (but happy) that other wedges didn't start to trip off as well.  There was a single trip on SE 15 but that wedge if far from being a troublemaker realtive to NE 20.  For the record NE 20 tripped 7-8 times over the last 16 hours.<br><br>
I've posted a new plot (below) which shows that the HVAC did not drop the level down.  2 years ago I think +45% humdity would cause some amount of dead time and turning off the effected section(s) of CMX.  The access (sometime around noon?) will likely drop the humdity when we enter the hall (and/or some other set of HVAC changes).  The change might (hopefully) cause a trip of the reconfigured miniskirt.  Still with only an hour we'll likely just have to make the best educated guess and at least get it down on the 10 degree section.
<br>
<a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-474&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-474' width='300'></a>

<!-- Comment: Fri Mar 23 07;26;26 comment by...Dale and John -->
March 22 Access Report - <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=243&frame=2&anchor=18:22:56.812'>
general info and instructions</a> via the shift elog.<br><br>
Details:  We went for the safer of the two options and combined the 4th and 5th 5-degree sections of the NE miniskirt on to iFIX NE 20.   This represents wedge 19, stacks 1-4. The last section was hooked up with the others on iFIX 18-19.  Eventually we will update <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=11&frame=2&anchor=21:23:31'>
the miniskirt HV configuration file</a>.<br><br>
While the detector was on and as the access was ending over at D0, NE 20 started to trip off confirming that we had guess correctly.  We put good money on the 4 being the bad guy but we'll cross that bridge when we get there.<br><br>As expected, there was a large drop in the humdidity along with the access (46% to 31% !).   We should put some serious thought into understanding what is going on with the HVAC.  The air exchange via the control access door doesn't seem like it would help that much.  The other obvious correlation is that the (HVAC colison hall) fans are turned to low.  There might be something to that but it isn't clear how that works.  Also note, we observed that the air seemed to be realtively well circulated around the NE when the fans (small industrial ones on the bottom of the BMU) were off.  With the fans on, it is possible that this creates an air pressure to come out of the Arch/IMU gaps.  This, in turn, means that fress air isn't so much reaching the bottom of the detector as the air is likely to come out off.  The "basement" theory seems to support the behavior with the outside weather.  One option would be to simply turn the fans around, but the overall benifit of having air on the face covers may be greater then then the potenial effect outlined above.


<!-- Date: Sat Mar 24 04:41:49 2007 -->
I was paged because the NE-20 miniskirt (wedges 4+6 of the NE miniskirt) was tripping too often.  Luminosity was high ~200, and data-taking was somewhat affected.  The wedge tripped two more times as I was investigating the situation.  I decided to disconnect it from the CAEN power supply.  CMX is still marked "good".  I connected the wedge to the droggy (drift cable->#1, anode cable->#7, I don't remember when they were switched).  The cathode tripped almost immediately at V=800V and I~0.1 muA.  I managed to stabilize it with V_anode=2000V and V_cathode=1000 V, but it is still too sensitive.  Half an hour later, V_cathode seems to hold at 1700V (turned anode off, it is OK). I_cathode=1.6 muA.  I will check it in ~30 minutes
<!-- Author: John -->
<!-- Comment: Sat Mar 24 06;04;35 comment by...John Strologas -->
I meant mA.


<!-- Date: Sat Mar 24 06:09:32 2007 -->
Now CMX NE-20 is holding HV on the droggy.  Not sure for how long.  I will call Dale in about half an hour and will ask him to come in and recheck it later, and if it really held, to include it with the rest of the CMX.  Right now CMX is marked good and the full CMX has HV on.
<!-- Author: John Strologas -->
<!-- Comment: Sat Mar 24 10;46;24 comment by...Dale -->
The cathode is responding as it did for John before.  I was on at 1kV and looked to be stable there but my intial ramp-ups caused trip after trip.<br><br>
Currently I've inched it up to 1.5 kV, the current is ~150 microA.    I've tested and it looks like it will ramp back up to this voltage after a trip on a higher setting.  The same cannot be said of ~2.0kV which I've safely reached but hasn't held and fails the previous test (it won't fast ramp up to 2kV).<br><br>
The plan is to try to inch it up and see how stable I can get it.  As of right now, it doesn't look like we are close to getting back on even with reduced gain (not the best option in this case anyway).<br><br>
Currently the rel. humidity is stable (good) but still a bit high (bad) at 47%.  I'll wonder by cyro after I try to up the voltage.  

<!-- Comment: Sat Mar 24 10;58;13 comment by...Dale -->
The cyro conversation went as normal.  There's not much they can due.  Turning on the AC would be a possible option.  I wouldn't mind try the CH fans at low between stores to see what that does.<br><br>
No improvement in the HV.  I got to a simular situation as John where the voltage was at 2.6 kV for minute or two and then very tempermental past or around 2.0kV on (slow) ramp-up.<br><br>
The plan will be to keep running as is and wait ~6 hours or so for a major change (improvement) in the HVAC.  If need be there's no reason why we cannot just keep the wedge out for the whole store if need be.

<!-- Comment: Sat Mar 24 11;13;26 comment by...Dale -->
<a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=248&frame=2&anchor=11:12:10.343'>My shift log entry</a> which also links to John's.


<!-- Date: Sat Mar 24 19:50:56 2007 -->
Update on NE 20:<br><br> 
I kept the wedge at 2.0kV when I left and it looks like it was stable at that voltage (or at least if it was tripping fast enough to see and was recovering).  Inched it up to 2.6kV, ramped it down quick and back up followed by a trip and difficulty getting pass 2.0kV again.  The currernt draw looks normal it just spikes (shorts) with a big enough change.<br><br> 
The humdity situation hasn't improved - best option is to go without the wedge for the rest of the store and perhaps well into the next until there is a definative change.
<!-- Author: Dale Stentz -->
<!-- Comment: Sat Mar 24 20;03;58 comment by...Dale -->
I left the power-supply with 1.5kV on both the cathode and anode.

<!-- Comment: Mon Mar 26 13;02;38 comment by...Dale and John -->
A store quenched eairly and we were able to further isolation the tripping channel.  Currently iFIX NE 20 represents the 4th 5-degree section of the NE miniskirt (stacks 1+2 of wedge 19).  <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=249&frame=2&anchor=22:34:49.874'>Shift entry here</a>.  <br><br>
We confirmed with the droggie that the other 5 sections held HV without issue and didn't go into "repeative trips" after being reset/reramped.  Given the condition of this section and the humdity not changing we have continued to leave this wedge out.  Dale was able to ramp-up the wedge to 3.0kV but ramping the voltage down and back up caused a trip and the channel then had trouble reaching above 1.0kV.  Generally we will keep the wedge off but should test it one or twice a day to check the behavior.


<!-- Date: Thu Mar 29 08:26:46 2007 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-475&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-475  width='300' align='top'></a></td><td>The relative humdity improves.  NE 20 seems much more friendly.  Will continue tests and report findings below.</td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Thu Mar 29 10;11;12 comment by...Dale -->
I ramped up the HV a few times and reached and held at 3.0k with out having to inch it up.  I hooked it up to the CAEN and ramped it up and down (with modified settings - see below) without a trip.  I still think the section is likely to fail at its weak link but the condition may be good enough to run.  This assumes it doesn't trip and we think the conditions (i.e. the weather) won't get worse.<br><br>
Here are the 
<a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=263&frame=2&anchor=08:19:26.565'>shift crew instructions</a> on testing it.  Currently it is on with the cathode at full voltage.  I changed the anode/sense value to be half (2.7kV) of normal so we could keep it up while MCR does beam tunes, etc.  Also, I changed the ramp time on the cathode: it is 300 V/s and not the default 100 V/s.  This was done in an effort to see if it would trip at this rate (it didn't/hasn't).  If it trips even once or if the humidity looks like it will start to climb my vote will be to keep it out.  If it is good then we may give it a shot on the next store.<br><br>
HV settings to change [just NE 20]:<pre>
field ramp up 300 --> 100 V/s
sense on voltage 2700 to 5400 V
</pre>


<!-- Date: Sat Mar 31 16:20:44 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=269&frame=2&anchor=13:59:38.835'>Lots of trips on NE 18-19.</a>  Looks like the 25 degee section has (as we suspected) a weak link in it.  So far NE 20 hasn't tripped but we attribute that to dumb luck - one or two trips will send this wedge packing into repeat-trip-land.  The link shows the humdity rise; as of right now, it is past 51%.<br><br> 
<b>HV Settings Changed</b> on both NE 18-19 + 20.  The anodes now have ramp up/down rates of 240 V/s [default 100/200].  The ramp up rate on the cathodes is unchanged but the ramp down is 240 (this may help when there are multiple trips and the anode gets too far ahead).  The CAEN trip time was also adjusted to 1 second for both pairs of channels; this is unlikely to help in this case but Dale is willing to try anything at this point.
<!-- Author: Dale and Andy -->
<!-- Comment: Tue Apr  3 08;21;27 comment by...Dale -->
Once the humidity settled down - so did these channels.  Despite the off and on rain the weather is mild and not as hot as a week ago.  This is actually bad from the prospective of the access today - we may have trouble finding the bad link.<br><br>
<u>Note: HV settings changed</u>.  First I put both HV pairs (NE 18-19 + 20) back to their orginal settings [100/200/.../0] and save them.  After that I then uped the ramp rate on the cathodes on NE 18-19 + 20 (anodes are uneffected).  I've ramped it at 200 V/s and have now made it 300 V/s.  No success in getting either wedge to trip.  Current draws are ~640 and 140 microA, respectively.<br><br>
Currently, prioir to our access later today, I have turned on all the miniskirt wedges (15-20).  The arches, etc. shouldn't be effected by any of the ISL work.  Note that Marry suggested that the miniskirt needs to be moved - should confirm its (correct) posistion when we go in.


<!-- Date: Wed Apr 4 02:00:32 2007 -->
This noon (April 3), during the long access, we managed to debug the CMX ifix NE 20 issue.  This was the 4th 5-degree section of the NE miniskirt, as you look from left (south) to right (north).  We found one chamber that was tripping easily, loudly with a spark, and we were able to reproduce this several times.  This is the stack#1-layer#1 chamber.  We decided to by-pass it and we did, since this caused many trips especially at high-humidity conditions. We then changed the configuration, so that ifix NE20 is now the two 5-degree sections 4+5 connected together, whereas ifix NE18-19 are 1+2+3+6.  The reason for this configuration is that the 1+2+3+5+6 configuration was weak lately, and there are chances that section 5 is the reason.  With the current HV configuration, NE20 can be turned off and CMX will be still good.  We tested the new configuration and it looked robust.
<!-- Author: John and Dale -->


<!-- Date: Wed Apr 4 09:43:54 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=281&frame=2&anchor=08:44:40.319'>NE 4 trips on ramp-up of 1st store after access</a>.  Suspects are water, water, and water.  <br><br> 
Currently I have the wedge on the droggie at 2.2 kV drawing just over 700 microA.  Note that I cannot take it higher - it trips but it looks just like the 80%.  In particular the current is steady.  Note that the trips occur on the cathode and that it was holding fine at stand-by between stores.  I haven't pieced together a time line yet to see if my story <i>holds water</i> but this is the only thing that comes to mind.  
<!-- Author: Dale -->
<!-- Comment: Wed Apr  4 09;55;34 comment by...Dale -->
Cable switch test:<p>
East 21 and 4 were switch to make sure the problem wasn't the pod.  I mannaged to get both wedges up.  The problematic wedge (now iFIX 21) draws 878 microA at full voltage on the cathode.  Note that it drew 0.9 to 1.0 mA when I ramped it up in the control room.  I also slowed down the ramp rate - this might have helped.  Regardless, I really don't want to trip this guy any more then I have to.
</p>Puting it back to normal.

<!-- Comment: Wed Apr  4 10;08;36 comment by...Dale -->
with everything back to normal: NE 4 ramped up fine.  I tried it a few times and also ramped up the hole detector as a final check.  My guess is that time, more than anything, did the job.<br><br>
We really need to think about a better draining system (or confirm that this was in fact the problem).

<!-- Comment: Wed Apr  4 14;05;42 comment by...Dale -->
<h4>Break Down of NE 4 Issues:</h4>
<ul>
<li>[11:30] <a
href="/cgi/elog/det-system-elog.pl?nb=cryo-gas&amp;action=view&amp;page=2251&amp;frame=2&amp;anchor=11:25:46">OK
given to power-down solenoid</a>. Quote Jim, "there is a huge ice
ball!!!!!" Various comments of the process systems being
self-aware.</li>
<li>[11:30] <a
href="/cgi/elog/elog.pl?nb=2007&amp;action=view&amp;page=281&amp;frame=2&amp;anchor=12:30:29.712">As
pointed out by Phil,</a>
the current on NE 4 [slow control channel 3] starts drifting around for
no
good reason. The nominal value (when tested ~10:00 today) is 0.4
at
full voltage w/o beam so values of +2 microA don't make much
sense.
Ignoring the spurious spike up to 30 microA, the rise occurs after
11:30
central daylight saving time.</li>
<li>[12:30] John+Dale both notice a drip of water.
Quickly attributed to cyro (Dale was in the control room when the
solenoid discussion was on going.) Rate of water leak assumed to
be small; you could see where the water would land (if it didn't hit
us) but no puddles formed, etc. We didn't think to check the platform
to see if it had the potential to overflow at some point.</li>
<li>[14:30] John and Dale leave the NE miniskirt and turn on all of
CMX.<br>
</li>
<li>[15:00] Solenoid in the process of being powered up.<a
href="/cgi/elog/det-system-elog.pl?nb=cryo-gas&amp;action=view&amp;page=2251&amp;frame=2&amp;anchor=15:13:12">Link.</a>
<br>
</li>
<li>[18:00] Solenoid back up - HVAC "normal" (assume the collision
hall fans) a few hours later. Temp drops from 77 to 74 degrees F.<br>
</li>
<li>[00:00] HV turned from on to stand-by as evident by the slow
control plots. Prior to this, the (anode) current draw is to large but
decreasing towards nominal.</li>
<li>[06:00] <a
href="/cgi/elog/elog.pl?nb=2007&amp;action=view&amp;page=280&amp;frame=2&amp;anchor=06:01:47.825">NE
4 trips at stand-by</a> 20 minutes before store is lost at
squeeze. Flogged by shift crew; eventually makes it up to
stand-by.</li>
<li>[10:00] <a
href="/cgi/elog/elog.pl?nb=2007&amp;action=view&amp;page=281&amp;frame=2&amp;anchor=08:44:40.319">Lazy-ass
pager carrier</a> makes his way in and gently nurses the wedge back up
to full voltage. Upon further inspection the current draw on the
cathode looks to be normal. Anode draws 0.4 as noted above.</li>
</ul>
<b>Analysis:</b><br>
<br>
I come to the same general conclusion that <a
href="/cgi/elog/elog.pl?nb=2007&amp;action=view&amp;page=281&amp;frame=2&amp;anchor=12:30:29.712">Phil
noted</a> but the exact timing of how much water melted where and when
is far
from obvious. The fact that the wedge on check out didn't trip
until a shift after the solenoid was back up and cold. Still,
this appears to be the logical explanation. The previous such
occurrence is noted <a
href="/cgi/elog/det-system-elog.pl?nb=cmx&amp;action=view&amp;page=9&amp;frame=2&amp;anchor=13:42:31">here,
back on Oct 10, 2005</a>. This was a fast dump and, more
importantly, it took over two shifts to get the solenoid back up to
speed.

<!-- Comment: Thu Apr  5 14;59;57 comment by...Dale -->
NE 4 has issues again after being well into a store. <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=283&frame=2&anchor=01:05:49.001'>
See entry in shift e-log for details.</a><br><br>
The trips forced us to take CMX out and to try to power back up every hour.  It eventually came up like I expected but the initial trips make little to no sense to me.  At this point, the wedge has been running strong without any trips for 12 hours.  <br><br>I got to think that source of the trips (e.g. water drop on chamber) has long since stopped.  The plan will be to let it be and see if any problems resurface.  Another such outbreak, we'll have to ask to take a look at it which will require 1-hour of steel movement and lift positioning to just take a look. I wish we had a camera mounted on the NE side looking into wedge 4 and the cryo area.


<!-- Date: Mon Apr 16 09:53:13 2007 -->
Spring is apparently back, <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=317&frame=2&anchor=09:29:02.197'>trips on SE 15</a> force us to run without.  Humidity is 31% and didn't look to be changing.  Normal takeout/recovery instructions for now. 
<!-- Author: Dale -->
<!-- Comment: Mon Apr 16 11;29;25 comment by...Dale -->
Note trips are on the cathode.  Looks like the wedge is stable at stand-by.

<!-- Comment: Tue Apr 17 12;13;03 comment by...Dale and Phil -->
Wedge was reincoperated into the store later on.  We put in an access request which we got <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=320&frame=2&anchor=12:03:17.107'>(shift e-log summary)</a> after a normal(no trips on SE 15) store.<br><Br>
The re-segmented the SE to be in a 10/20 configuration (previous was default 15/15).  Thus a trip on iFIX 15 is actually the last stack of 15 and the first 3 stacks of 16 [15:5 to 16:2].  iFIX 16-17 is the rest.  Many (simular to above) trips on 16-17 point to the "new" stack while iFIX 15 can be powered down if need be.
<br><br>
Note the current draws look normal with ~278 and ~515 on the cathodes.  Also, the segmentation of the 3rd 5 degree section (the defector) is a bit odd due to the anode "ends" at the 4th section inorder to better fit the anode connection there.


<!-- Date: Tue May 8 08:50:50 2007 -->
There was another outbreak of trips on NE 20 as noted <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=381&frame=2&anchor=18:04:52.008'> 
here</a>.  The latest instructions and a two-day plot of the humdity is <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=382&frame=2&anchor=07:32:22.592'> here</a>.<br><br> 
Currently, our plan is to hold off on action and monitor the condition of the wedge further.
<!-- Author: Dale -->


<!-- Date: Thu May 10 11:38:04 2007 -->
We are in access today working on the NE wedge 20.  We haven't been able to get the system to trip.  The current plan is to test things a bit longer and hope for a couple of trips to point to one of the 5-degree sections we have isolated on the 2 NE miniskirt HV channels.  Post access summary to follow below.
<!-- Author: Dale, John, Ingyin -->
<!-- Comment: Thu May 10 13;46;41 comment by...Dale, John, Ingyin -->
<a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=389&frame=2&anchor=10:27:30.864'>Shift e-log summary.</a>  Further details to be posted later.

<!-- Comment: Fri May 11 13;51;15 comment by...Dale, John, Ingyin -->
Yesterday's access was a very minor improvement in the configuration of the NE miniskirt.  The current configuration is a 5+1 configuration.  iFIX NE 20 channel is the 5th 5-degree section from low to high phi (left to right).  This matches up with wedge 19 stacks 3-4.  Obviously, iFIX NE 18-19 is everything else.<br><br>
We based the resegmenting off of two trips when we were testing each 5 degree section.  The trips were well spaced in time and were recovered without issue (although a bit slowly reported).  There was a single trip on SW CMX 13-14 which was almost certainly an artifact of the arch being pulled.  Note that the overlap region between the SW arch (wedge 7) and the keystone (wedge 6) opened in closed without issue.<br><br>
So far, no trips since the switch.  The outside weather is a tad bit nicer although the humidity in the hall is brouning around our trip threshold: 44-46%.


<!-- Date: Tue Jun 12 08:18:54 2007 -->
Numerious HV trips on NE CMX 20 from around June 1st.  The 5-degree section was powered down during several stores if not taken out completely for an entire set of stores.<br><br> 
Examples of trips: <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=454&frame=2&anchor=02:18:59.117'>here</a> and <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=466&frame=2&anchor=01:22:16.440'>here</a>, and when we decided to turn things off <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=467&frame=2&anchor=08:55:10.291'> 
here</a> and <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=473&frame=2&anchor=14:47:45.657'> 
here</a>.<br> 
  
<!-- Author: Dale, Phil, John -->


<!-- Date: Tue Jun 12 08:46:55 2007 -->
We went in on an access yesterday to try to address the trips on NE20.  Our report in the shift e-log is <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=485&frame=2&anchor=15:47:16.591'> 
here</a>.<br><Br> 
We were not able to get the wedge to trip.  Note the conditions in the hall felt realtively cool.  We tested the whole section and later split it into 2 (one drift HV channel for each stack).  Fast ramping up to 3.1 kV would budge anything to trip.  Note that the current make up of wedge 19 stacks 3-4 is such that all channels (16) are connected (there are no by-passes in the area).<br><BR> 
As we weren't having any luck, we deciced to split the section and to leave out one of the stacks.  We kept the "left" stack (19:3) which is the one the HV already was connected to.  We by-passed stack 4 on the drift by simply removing one end of jumper.  The anode was the issue that required some effort - we had to manually kapton tape the 8 channels at then end of the anode web/di-octopus.  Our organization on this section when we orginally insturmented it was good and thus finding/accounting for the right one was realtively easy and shouldn't be hard to back out of.<br><Br> 
The end result is that 19:4 is unpowered.  So far no trips on iFIX NE 20.  If the humdity cycles up and down and we get a few trips on  NW 21 without out any/much on NE 20 then we likely guessed "correctly".  Repeat trips signal that at least one-half of the area is bad.  In all cases, futher access (when it is in a tripping mode) is required.    
<!-- Author: Dale and John -->


<!-- Date: Sun Jun 24 21:48:31 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=525&frame=2&anchor=21:06:37.855'>Trips with SW 15</a> reported in the link to the shift e-log.  There were also trips with NW 20 yesterday (link and info to be entered later). 
<br><br> 
Looking at SW 15 I see that the cathode trips above 1.6 kV (it's stable now with 0.3 microA).  [Note that this section is a 20 degree section.]  I'll try to inch it up and see if it will hold for any amount of time.  I suspect that the problem might simply recover with enough time and a couple of well placed trips to "clear the cob-webs out".  
<!-- Author: Dale -->
<!-- Comment: Sun Jun 24 21;56;41 comment by...Dale -->
HV on drift now at 2.8 kV (0.5 mA - note above entry should have 0.3 mA - not micro).  I put the anode at 4k.  The anode seems to (as is sometimes the case) have a calming effect on the cathode.  The real thing that looked a bit funny is that at lower voltage on the anode the current seem to spike down as if the resistance was increased (wow my spelling is bad today...).  At 4kV, I see a 1.2 which seems a bit inflated.  Will take it up to 3.0 / 5.6 kV and try to tempt the system into a trip to see how it recovers, etc.

<!-- Comment: Sun Jun 24 22;04;42 comment by...Dale -->
The suggested test looks good.  It handles 3.0 fine although the current seems to "hang" for a few seconds at a higher value (~.6 mA) before droping down.  The anode is over 1 uA at 5.6 which seems a bit high but acts normal.  Note that I did look at the trip log and it appears all the trips were on the cathode; consistant with the std. humdity problems of recent and the past.

<!-- Comment: Mon Jun 25 09;54;19 comment by...Dale -->
Here's a <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=522&frame=2&anchor=23:37:58.019'>
link</a> to the joy on another channel on Saturday.  As incorrectly reported above, the problem was not the NW 20 but the NE 20 as correctly reported in the link to the shift e-log.  Somewhere this information was mis-reported between John and myself.  Note that the trips there were also on the cathode.  Currently we are
<a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=527&frame=2&anchor=09:46:00.045'>testing the HV</a> by leaving it on during the access.


<!-- Date: Fri Jul 6 23:21:23 2007 -->
More issues with SW 15.  <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=561&frame=2&anchor=22:57:39.052'>Link.</a><br><br> 
When I hooked it up to the droggie the HV current was very non-linear.  1000 V got up to a shakey .8 mA.  I've since tempered it (try to get it to stabilze at a voltage and ramp up with the expect current draw).  As like before (see above) applying the anode seemed to help the cause - It is at 2kV - enough to draw a bit of current on its own.  As of now, the cathode is at 3kV with just a bit over .5mA (for 20 degrees that's about right).  It is stable without any trips.  
<!-- Author: Dale -->
<!-- Comment: Fri Jul  6 23;26;59 comment by...Dale -->
Bruce is gun-ho to get it back in - fine by me ;) Holding fine with 3kV/5.6kV.


<!-- Date: Wed Jul 11 12:21:28 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=575&frame=2&anchor=10:53:30.363'>Some destructive behavior on iFIX SE 16-17</a>.<br><br> 
The problem and it's likely cause is known.  The last 5-degree section of SE 17 had it's filter box broken up but good.  This section at the end next to the 5-degree 270^o gap was likely snaged.
<!-- Author: Dale, Phil, John -->
<!-- Comment: Wed Jul 11 13;48;02 comment by...Dale, Phil, John -->
The 2nd and 3rd 5-degree sections had their anode "filter box" replaced.  The last one (as reported previously) was hosed while the 2nd one looked to have only structual damange but proved to trip upon testing.  We will have to look over that box as we may only have 1 more spare (and that one might require a bit a work to make the box fit well).
<br><br>
more to come...


<!-- Date: Mon Oct 1 11:31:20 2007 -->
Yes there is a shutdown and yes we are doing some work...<br><br> 
Ricardo spoted a cable connection to the SE ASD crate that was not well connected.  This turned out to be wedge 16 cables (0-23).  It was slanted such that the lower channels would possibly not have made good contact (slanted upwords).  Note that this was connection to the port card i.e. not the connection to the ASD itself.<br><br> 
In other news, we resegmented the SW miniskirt: it is now 15x15 degrees rather than the 10x20 configuration of before.  Trips were showing up normally in the 20 degree section so that should give us a bit more insight if problems arise futher down the road.<br><br> 
Note that SE MS is split 10x20 (low to high phi) and NW is the normal 15x15. 
<br><br> 
Intial work on NE miniskirt (the excluded stack: 19:4) has not been fruitful.  We have the stack divided in two (by phi not by pre-amp board).  Each section (under N2) holds 3kV without issue with ~36 uA on each set of 4 chambers.  Quick ramps show a rebust set of chambers - the connections in the hall are very mild and everything is opened up so that air is well ciculated.  We're going to do some long term testing.  More news to come after the break.
<!-- Author: Dale and John -->
<!-- Comment: Mon Oct  1 15;51;12 comment by...Dale and John -->
<br>Long term HV testing of NE 19:4 has yielded no trips on either of the sections.  Note that the anode is currently not connected for any of the chambers in this excluded stack.  We put the cover on for protection and to (modestly) make the conditions for tripping closer to what is expected.  <br><br>
Either becaused we missed it the 1st time around or (perhaps more likely) because of recent work being done with lifts, the 2nd anode box for the NW miniskirt (that is the 2nd the last 5 degree section in phi, 19:3-4) was smashed up.  The wires were bent but nothing was broken off.  We suspect that it may still work but had to apply an abhesive compound to attach the capacitors and such back to the Aluminium box structure.  We haven't reported the issue yet but will let it be known once the issue is resolved.<br><br>Other work/check stuff: checked several preamps for correct LV; yep it's just fine where we checked.  Simple ASD inspection (from the floor) didn't catch any other bad connections between cables/boards.  I other news our flashlight appears to be missing.
<br><br>
Summary: short term - check NW 19:3-4 to see if filter box is fine (HV testing).  Long Term - see if one section on NE 19:4 will trip.


<!-- Date: Tue Oct 2 11:28:04 2007 -->
The NW 2nd 5 degree section (19:3-4) still was tripping on the cathode as it was yesterday.  Our tests do show that the anode appears to be fine and robust up to 5.6kV and the box has been taped up so that it is soild.  Note that without the "cover" and tape on the filter box, the bottom section (where the SHV connects at) will hang down and only be held up by the ground and lead HV wrires.  <br><Br> 
Upon further inspection when we tried to find the bad channel via a normal binomial search.  Tracked it down to 19:3 quickly and then to wires 4 & 6.  Trips happend at < ~300V; trips off quick (a very strong threshold effect).  Testing 4 & 6 indivdualy showed both chambers to be healthy.  A jumper swap showed that together they were fine and we were able to reverse out of the search with everything holding just fine at 3.0kV.  We did, as a matter of completeness, test the same jumper between wires 4 & 6 and yes it also held just fine.  Nevertheless, we kept the replaced jumper.<br><br> 
In summary, the NW miniskirt appears to be fine and awaits long term testing when the gas returns.  Our tests on the NE continue.  The bad stack did not trip last night.  We will check the supply before turning in our keys at ~15:00.
<!-- Author: Dale and John -->
<!-- Comment: Wed Oct  3 12;02;04 comment by...Dale and John -->
update:<br><br>Still no trips on NE 19.  We have it regmented to test the entire wedge (this might make it eaiser to find assuming this helps it trip).  Stack 4 is still split into even ("left") and odd ("right") sections.  Now the odd section is connected with the 1st 15 degrees of the NE ms while the even is the rest of the 2nd section (these would be HV "wedges" 18 and 19 respetively).  <bR><br>There are several things to note about this configuration: currently the anode is all connected together - there is only one channel for the purpose of testing now; 19:3 is directly jumpered to 19:2 (i.e. the old fashion way); the jumper which connected the cathode HV between stacks (3-4) is still in our box and has a piece of kapton tape in the middle; the HV is set to 3.0kV on each section and draws about .4 mA on each wedge (a bit more for the larger one); the anode is also set at 3.0kV such that it will not be too high to 'hurt' the chamber if a wedge does trip off.<br><Br>
HV test in progress - will be "modified" to allow the (east) IMU to be closed Thursday.


<!-- Date: Thu Oct 4 11:09:18 2007 -->
<b>The Saga of East 19:4</b> (cont.)<br><br>Dervin and crew closed up the east toroid and via our re-arangment last night the portable HV supply was transprarent.  When checked (~9:30) we discovered that we did indeed have a single trip.  As we were not there when the IMU was being closed it is impossible to say that this wasn't cause by that in someway.  However, the cathode being bumped off is unlikely as all the crew needed to do was move stuff out of the way and needn't come close to the miniskirt itself.  Thus we suspect that this may have been the real deal.<br><br> 
The trip relates to the "right" channel on the drogie or effectively HV wedge 19.  This would link to the <u>left</u> (even wire #) side of stack 4.<br><br> 
The plan will be to check back later and see if we get another trip.  There are several options depending on if we get more trips and also if the east toroid opens back up or not on Friday.
<!-- Author: Dale and John -->
<!-- Comment: Tue Oct  9 11;47;22 comment by...John, Dale, and Andy -->
There were two more trips on the mostly wedge 19 side (thus the even # wires in stack 4 are the likely suspect).  We took our lazyness to the extreme (perhaps too far-see below) via placing the droggie in the line of sight of the NE camera:<br>

<a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-476&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-477' ></a>
<br><br>Yesterday John with help from Steve was able to turn off the supply all be it a bit after gas had started to flow.  
<br><br>
Today Andy and Dale went in and reconfigured the NE - it should be ready to be turned on when the CMX is fully flushed.  Wires 0 and 2 are connected to stack 3 which is iFIX "NE 19".  Wires 4,6, 1, 3, 5, 7 (the rest of stack 4) is connected with the last 5 degrees of HV wedge 18 (18:5+19:0).  If things behave the same way we may be able to get this down to a pair of chambers.  Note that the anode is split realtive to each 5 degree section so we should adjust the value to be lower than nominal set value (~2-3kV).  




<!-- Date: Wed Oct 10 10:59:04 2007 -->
The HV has been unlocked for CMX.  The ramp up to stand-by went on without a hitch.  When turning on to full voltage, West 4-5 did trip on the anode but a re-try a few minutes later showed it was fine (current levels there look normal: 0.4 uA).<br><Br> 
NE 18-19 + 20 also came up fine.  They read 158 and 84 uA, respectively, on the drift.  Orginally the anode was at the default setting but Dale relaxed it to 2.7kV for the purpose of testing.<br><br> 
Shift e-log detailing the unlockout and orginal instructions is <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=788&frame=2&anchor=10:44:52.882'>here</a>.  We rather keep the insturctions for the muon HV universal for now so no "special" instructions for the NE miniskirt HV.
<!-- Author: Phil, Steve, and Dale -->


<!-- Date: Wed Oct 10 12:38:02 2007 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-478&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-479' ></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-480&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-481' ></a></center>
<!-- Author: Dale -->
<!-- Comment: Wed Oct 10 12;39;17 comment by...Dale -->
Here is what CMX looks like with the HV on.  Current/voltages should be "normal" everywhere except NE 18-20.


<!-- Date: Thu Oct 11 09:36:02 2007 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-482&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-482' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-483&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-483' width='300'></a></center>
<!-- Author: Dale -->
<!-- Comment: Thu Oct 11 09;37;10 comment by...Dale -->
I lack the time to detail the plots/errors.
<br><Br>
In short - we need to look at signals around west wedge 0.

<!-- Comment: Thu Oct 11 14;12;10 comment by...Dale and John -->
Only time will tell but the oscilations on the NW appear to be gone.  They stoped when we pulled the LV on 23.  Pulling 0 & 1 by themself keeped oscilations elsewhere.  Note that we (John) pulled several LV cables so this may have helped in killing the noise.<br><br>
The plan is to wait a bit and see if the noise returns.  Since we know 23 is the more likely suspect we can start pulling LV/signal cables if need be Friday morning.


<!-- Date: Tue Oct 16 08:20:05 2007 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-484&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-484  width='300' align='top'></a></td><td>"other stuff" needs to be explained inbetween this entry and the last - we'll short that out later.<br><br> 
This is the 2d occupancy over night.  I've changed the minimum to make the obvious dead areas, well, obvious.  NW 19:0 is still gone, SE 15+16 (ifix 15) was off for most of the run/night so that's why its dead.  Wedge 5 is still crap-tactular although it appears that wedge 3+4 also aren't in as good as shape as one would like.  TDC seems unlikely but if the modified radicas consipred with a real TDC issue that might explain something.</td></tr></table>
<!-- Author: Dale -->
<!-- Comment: Tue Oct 16 13;33;40 comment by...Dale -->
It appears that it is a rather good than to keep these aces around: LV power supply issue spoted in the NW CMX???  (<a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=800&frame=2&anchor=10:31:26.397'>see this link here</a>)  A very interesting finding indeed although I haven't figured out how this fits in with the exact beahavior see in the arch but the LV (power supply?) is now a serious suspect worth looking into.<br><BR>

A quick confirmation:<br>
<a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-487&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-487' width='300'></a>
<br><Br>
A history of this value would be very useful.
<!-- Date: Tue Oct 16 08:29:52 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=799&frame=2&anchor=22:28:48.496'>SW 15 out trips other wedges...</a> <br><Br> 
The cathode on west "wedge 16" is going south on us.  Recall that we reduced this section to a 15 degree ifix wedge (it was 20).  It looks like we need to cut it down again or go for the actual problem when we get a chance.  <br><br> 
The droggie shows that it can have its "nice" moments and reach ~2.4 kV but the current seems to be larger than one would expect (0.4 mA at 2.4 kV).  When it's in a tripping state (it wasn't able to hold this morning) and its tripped once from its bliss then it will have trouble being under 0.8 mA and won't let us get to 2.0 kV.  Having it semi-stable with current spikes below trip threshold with 1.6 kV shows an average (non-spiking) current draw of 0.6 mA.  <br><br>We'll do a bit more testing and likely leave it at a stable voltage and try it later.
<!-- Author: John and Dale -->
<!-- Comment: Tue Oct 16 08;50;31 comment by...Dale -->
Other trips since Sunday (Oct 14) [iFIX wedges]<pre>
West 15    = >10 (frequent re-trips on cathode)
West 18-19 = 1
West 20    = 1
West 21    = 6 (anode)
East 16-17 = 4
East 20    = 1</pre>







<!-- Comment: Tue Oct 16 11;07;08 comment by...Dale -->
NE humidity and Dewpoint over the last two days:<br><br>
<a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-485&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-485' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-486&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-486' width='300'></a><br>



<!-- Date: Thu Oct 18 13:05:03 2007 -->
<pre>Note that we accessed on Wed for a couple of hours. The reports are in the CDF elog &lt;a href= 
'http://www-cdfonline.fnal.gov/cgi/elog/elog.pl?nb=2007&action=view&page=803&frame=2&anchor=12:02:12.135'&gt; 
1&lt;/a&gt;, &lt;a href= 
'http://www-cdfonline.fnal.gov/cgi/elog/elog.pl?nb=2007&action=view&page=803&frame=2&anchor=12:13:38.382'&gt; 
2&lt;/a&gt;.</pre>
<!-- Author: Phil -->
<!-- Comment: Thu Oct 18 13;06;14 comment by...p -->
<pre>oops, html below</pre>
<!-- Date: Thu Oct 18 13:05:49 2007 -->
Note that we accessed on Wed for a couple of hours. The reports are in the CDF elog <a href= 
 
 
'http://www-cdfonline.fnal.gov/cgi/elog/elog.pl?nb=2007&action=view&page=803&frame=2&anchor=12:02:12.135'>  
 
1</a>, <a href=  
'http://www-cdfonline.fnal.gov/cgi/elog/elog.pl?nb=2007&action=view&page=803&frame=2&anchor=12:13:38.382'>  
 
2</a>.
<!-- Author: Phil Schlabach -->



<!-- Date: Thu Oct 18 13:12:41 2007 -->
<pre>CMX wedge 4 has an oscillating preamp. I presume this is the usual post shutdown thing where it oscillates at standby HV and not if it is ON or OFF.</pre>
<!-- Author: Phil -->
<!-- Comment: Mon Oct 22 15;37;36 comment by...Phil -->
<pre>The thing in wedge 4W is not so usual in the sense that it persists at all HV states. There is now another in wedge 8W which is the usual thing.</pre>


<!-- Date: Tue Oct 23 10:58:19 2007 -->
<b>debuging oscilations in NW CMX arch:</b> 
<br><br> 
removed 4:01 and 3:03 ==> some noise still in 0+1 and lower parts of 3 and upper parts of 4 (<i>these LV cables are "switched"</i> further details later)
<!-- Author: Dale and John -->
<!-- Comment: Tue Oct 23 11;11;13 comment by...D+J -->
4:00 out ==> noise in 1 + 3, and still hardcore in 4

<!-- Comment: Tue Oct 23 12;12;55 comment by...D+J+A -->
4:02 ==> 3 is better (also 0+1), still there in 4<br>
3:10 ==> same as above (note 23 also oscilates)<br>
4:03 ==> same as above<br>
4:04 ==> all seem ok except 0+1 and still osci. in 4<br>
4:05 ==> same as above<br>
4:06 ==> same as above<br>
4:07 ==> same, some echo noise in middle 16 despite being unplugged<br>
4:09 ==> <b>Bingo, all seem better now</b><br>
4:09 ==> back in waiting...


<!-- Comment: Thu Oct 25 22;21;29 comment by...Dale, John and Andy -->
hmmm... did we finish the entry above?  Anyway,<br>
<br><b>Access Summary</b><br><br>
- NW oscilations: this appears to be fixed - no re-occurance of oscilation since then.  As noted above, 4:09 doesn't have its LV pluged in.  This is, as expected, shown up as dead channels for YMon#=36-39 (see below for Phil's plot).  
<br><br>
- Unexpected casulaties are 6 channels around #=16-23 (with 17&19 ok) or signal cable/pre-amp 4:04-05.  Note that #12-15 is a known by-passed area, more on this later.  Our likely suspect would actually be the ASD card - if the signal cables were tilted down this could explain the dead channels.  We checked the LV at the preamps, 3 for the 4 fuses we could get at checked out ok, switching the LV had, of course, no effect.  Outside of ASD issue, there is a very unlikely but non-zero proablity that the HV is some-how goofy.  Reason why this is a possiblity only exists because the chambers for 4:03 are by-passed simular to what we do in the miniskirt (circa the Abrahamic period).  It's hard to see how but the jumping is odd.  Note that we did leave 4:03 pluged in - we really should unplug the LV and signal cable when we get a chance.<br><br>
- The Wedge 5 low/zero occupancy appears to be fixed (again see plot below).  The ASD threshold was -0.85.  Dale "lowered" it to -0.75.  Note that the varible is actually swung out from the board.  <i>It is not in good shape</i> and should only be moved before we removed the card (if the need should arise).  Dale can get to this if the ASD needs adjusting.
<br><br>- Wedge 18 when scaning the ASD create to solve the above problem we did a check out of the LV to the create (fine) and checked the thresholds else where.  Wedge 18 (this is the 2nd ASD from the left) had a thresold of -0.23 V.  We think this is the cause of the issue below.  (In case it wasn't obvious; something "had" to have happened to the crate over the shutdown to cause these problems, power outages?)  Here is the previous issue <a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=10&frame=2&anchor=12:53:45'>which is required reading for us all</a>.  The ideal thing would be to addjust the thresold up to ~-1.0 V.<br><br>
- Wedge 8 oscilations: didn't have time for this.
<br><br>
- Wedge 19, stack 0: checked it and looked at signals from the preamp: they were there.  Checked the ASD cable, looked fine but given a gentle shove to "make sure".  Our conclusion was that the problem, given the information, must be at the ASD or else where above the preamp.  Lucky dog, lucky dog, this guy fixed itself (see below).
<!-- Date: Wed Oct 24 15:14:30 2007 -->
<table><tr><td><a href=/elog/notebooks/cmx/Wed_Oct_24_2007_151427.ps align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-489  align='top'></a></td><td>2d occupancy from a cosmic ray run this morning.</td></tr></table>
<!-- Author: Phil -->
<!-- Comment: Thu Oct 25 00;52;28 comment by...Dale -->
*.ps files suck<br>
<a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-492&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-492' width='300'></a>
<!-- Comment: Thu Oct 25 00;53;23 comment by...Dale -->
*.ps files suck<br>
<a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-492&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-492' width='300'></a>
<!-- Comment: Thu Oct 25 22;25;53 comment by...Dale -->
Stupid e-log...<br><br>
I've highlighed the suspect areas.  
<br>- W19, stack 0 if fixed.  
<br>- W18 looks like shit - threshold that we read off was likely correct.  
<br>- Wedge 5 looks fine.  
<br>- Wedge 4 has 4 pre-amps (14 channels) dead.  8 dead channels are expected (see our summary above for details) the other 6 are not.
<!-- Date: Wed Oct 24 15:15:39 2007 -->
<a href= 
'http://www-cdfonline.fnal.gov/cgi/elog/elog.pl?nb=2007&action=view&page=824&frame=2&anchor=14:42:04.637'> 
Link</a> to the HV news
<!-- Author: Phil -->






<!-- Date: Thu Oct 25 23:24:30 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=828&frame=2&anchor=22:42:14.361'>Dale undid the HV settings that Phil changed</a>.  Dale reasons that this will give the shift crew something to do over the owl shift.  May come back to bite us; time will tell.
<!-- Author: Dale and Phil -->


<!-- Date: Wed Nov 7 08:50:21 2007 -->
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=864&frame=2&anchor=00:11:34.989'>Here is the Access Summary from yesterday</a>.  <br><br> 
We changed out the radekas for 4-08+09 (09 was the one that didn't have its LV was in).  Getting the cover off for this stack (4:4) was a real bitch; the design of this thing is very crapy.  We ended up cutting up the Al cover plate and in the process (dale) killed a anode jumper in the process.  We replaced the jumper with some additional effor and then the radekas. (Note that we would have still had to replace the radekas in 4-08 just based on several of them getting damaged.)  Getting in 6 of them was trival.  The 2nd to last one was a bit tricky and we had to resort to using pliers to get the last one (the steel made this too difficult to put in and we droped many a radeka trying to get it in my hand).  After putting back in the signal/LV cables we were happy that the signals for that stack (and the rest of the wedge) was as expected.  The signals at the TDC crate looked very well behaved.<br><br> 
<a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=859&frame=2&anchor=03:14:50.633'>Here is the access report from Monday when we by-passed wedge 3.</a> It is detailed enough on wedge 3 and also describes the bad connection at the ASD for wedge 4.<br><br> 
Our work yesterday focused on trying to find the weak link on wedge 3.  As reported in the 1st link we were initially hopeful that we could actually locate it by the way it sparked.  Our efforts appear futile as the trips on the wedge as a whole (while the IMU was being moved out) became less frequent and disappeared by the time we actually started to divide.  The likely hood that we actually "fixed" something by re-touching jumpers that have been in action for about a decade seems remote.  We ended up removing 3 covers for stacks 3:3+5 + 4:0 (note that 4:1 was already opened up via previous work - more on this later).  We tested things as far as we could with these configurations but were not able to get the wedge to trip or to show extreme miss-behavior in its current draw.<br><Br> 
We decided to reconfigure the HV in case trips would return.  Given the state of affairs in the natural start of the HV in wedge 4 (e.g. at stack 1) this was both easy and difficult.  Easy as there were jumpers which could be moved over to start else where but hard as crossing the boundary from 4:0 to 4:1 was messy and care was needed to take care of some of Abraham's legacy work.  Recall that all but 4:1:1-3 is by-passed in that stack.  Note that we taped off several "dead-end" jumpers that had been left there.  Dale's offer to John to continue to "make sense" of this still stands as Ingyin and Dale were completely perplexed when we looked at it circa 2004.<br><br> 
The current configuration for iFIX wedges 4-5 includes 2 additional stacks (3:5 + 4:0) as described below.  We added jumpers as needed to cross the old boundary.  To make the new boundary we were able to cleanly remove the cathode jumper between stacks (it can be found on the steel above) and taped off the anode coming from the (still covered) preamp.  Note that there have been no trips so far.<pre>Original configuration for ifix 21 & 4-5: 
[wedge21][3:1][3:2][3:3][3:4][3:5][4:0] & [4:1][...][wedge5] 
 
 
New: 
 
[wedge21][3:1][3:2][3:3][3:4] & [3:5][4:0][4:1][...][wedge5]</pre>
<!-- Author: Dale and John -->
<!-- Comment: Fri Nov 30 17;13;11 comment by...Dale and John -->
It appears we got lucky - 4-5 trip off on the anode.  Trips as low as 500V with current spiking around 90 uA.<br><br>
In the access (to follow shortly) we will test 3:5 & 4:0 (after a sanity check that the normal hook up of 4-5 works).

<!-- Comment: Fri Nov 30 17;15;35 comment by...Dale -->
forgot links: <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=932&frame=2&anchor=14:30:16.290'>here</a> and <a href=
'/cgi/elog/elog.pl?nb=2007&action=view&page=932&frame=2&anchor=15:46:19.030'>here</a> 


<!-- Date: Mon Dec 3 14:50:41 2007 -->
Lets's try this again:  Access summary from Friday: <a href= 
'/cgi/elog/elog.pl?nb=2007&action=view&page=936&frame=2&anchor=21:29:46.475'> 
link</a>.<br><br> 
The first 45 minutes of this access was spent effectively shooting ourselves in the foot.  The trip wasn't in the first two (added) stacks.  The solution was to remove the last two stacks of wedge 4 (4:4-5).  Additionally, we also replaced the SHV-to-jumper for the cathode (we suspect that this was not a problem but it didn't look as robust as we wanted).<br><br> 
One issue that was a bit strange was that there was not any problem on the cathode while the wedge was out (Phil had just removed the anode HV cable from the back of the CAEN) however, something was definitely wrong with the current draw.  When testing w/o wedge 5 (7 stacks) we were drawing 0.6 mA at 2.2-2.4 kV.  Removing the anode without the cathode didn't look any different on our end by the wedge tripped when we figured out the anode HV issue at the end of wedge 4.  Our observations in the hall suggest that the HV was shorting out the anode such that it would also take out the cathode.  But then this doesn't fit with its configuration before hand.<br><br> 
We decided to stop to stop at stack 4 because this was the last open cover and it was an otherwise easy place to stop (it was very easy to access the area, etc.).  The anode problem is/should be very easy to find however.  With ~2kV on the cathode and +5kV on the anode the current on the working part of the anode was ~5 uA.  The bad section drew several mA at low voltage (e.g. 100V) and had a linear current draw.  Testing the remaining stacks should be easy after we remove the last cover (4:5) but testing each preamp has the added hassle that we ought to match the cathode given the above behavior.<br><br> 
Current draw for the iFIX 4-5 is 636 uA and 0.6 uA for the cathode and anode, respectively.
<!-- Author: Dale and John -->


<!-- Date: Wed Jan 9 11:35:58 2008 -->
<center><a href='/elog/notebooks/cmx/Wed_Jan__9_2008_113445.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-494' ></a><a href='/elog/notebooks/cmx/Wed_Jan__9_2008_113515.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-496' ></a><a href='/elog/notebooks/cmx/Wed_Jan__9_2008_113540.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-498' ></a></center>
<!-- Author: Phil -->
<!-- Comment: Wed Jan  9 11;37;26 comment by...Phil -->
<pre>Plots related to the remarks I am about to make.</pre>

<!-- Comment: Wed Jan  9 11;44;26 comment by...Phil -->
<pre>Large event fragments from CMX_01
&lt;ol&gt;
&lt;li&gt;They appear to becoming from the detector or the front end although there isn't any evidence that these are necessarily at fault.&lt;/li&gt;
&lt;li&gt;There appears to be noise lighting up the entire east side at the frequency of 10-4. In these events most of the channels are hit with the maximum hit count with short, narrow hits. From the multiplicity plots, it looks like the south side is worse than the north but there isn't much else to distinguish the two.&lt;/li&gt;
&lt;li&gt;Because the occupancy is relatively flat and low one, the monitoring plots look OK when running with HV on either with beam or when taking cosmic ray data. The only thing one sees are the complaints from the EVB when it gets a large event fragment. That the only detrimental effect I've thought of.&lt;/li&gt;
&lt;li&gt;I've attached YMon plots from a run with no beam and the HV on which I've based the previous remarks. I know Jonathan and Bill have looked at at least one event fragment the EVB types trapped. The plots are consistent with what they described, so I'm assuming they are the same.&lt;/li&gt;
&lt;li&gt;The north and south arch are autonomous from the point of view of infrastructure quite a ways back up the chain. At some point they both get 400 Hz power from the same spigot although I've forgotten where.&lt;/li&gt;
&lt;li&gt;It doesn't really look like a detector problem. One suspects some noise in the power or noise from some other source that gets picked up. I've considered and rejected the idea that the calibration pulser is firing. Also worth noting is that only those regions actually connected to the chamber are affected. There are regions with ASD instrumentation that aren't showing any hits. The origination of the data is at the chamber/preamp.
&lt;li&gt;The problem seems to come and go, here for days and then gone for months. Given that and the low frequency, it's hard to see figuring out the source.&lt;/li&gt;
&lt;li&gt;It would be interesting to know if anything else detector wise lights up at the same time.&lt;/li&gt;
&lt;/ol&gt;</pre>

<!-- Comment: Wed Jan  9 11;45;17 comment by...if you prefer the formatted version -->
Large event fragments from CMX_01
<ol>
<li>They appear to becoming from the detector or the front end although there isn't any
evidence that these are necessarily at fault.</li>

<li>There appears to be noise lighting up the entire east side at the frequency of 10-4. In
these events most of the channels are hit with the maximum hit count with short, narrow hits. From
the multiplicity plots, it looks like the south side is worse than the north but there isn't much
else to distinguish the two.</li>

<li>Because the occupancy is relatively flat and low one, the monitoring plots look OK when
running with HV on either with beam or when taking cosmic ray data. The only thing one sees are the
complaints from the EVB when it gets a large event fragment. That the only detrimental effect I've
thought of.</li>

<li>I've attached YMon plots from a run with no beam and the HV on which I've based the
previous remarks. I know Jonathan and Bill have looked at at least one event fragment the EVB types
trapped. The plots are consistent with what they described, so I'm assuming they are the
same.</li>

<li>The north and south arch are autonomous from the point of view of infrastructure quite a
ways back up the chain. At some point they both get 400 Hz power from the same spigot although I've
forgotten where.</li>

<li>It doesn't really look like a detector problem. One suspects some noise in the power or
noise from some other source that gets picked up. I've considered and rejected the idea that the
calibration pulser is firing. Also worth noting is that only those regions actually connected to the
chamber are affected. There are regions with ASD instrumentation that aren't showing any hits. The
origination of the data is at the chamber/preamp.

<li>The problem seems to come and go, here for days and then gone for months. Given that and
the low frequency, it's hard to see figuring out the source.</li>

<li>It would be interesting to know if anything else detector wise lights up at the same
time.</li>

</ol>