<!-- Title: 09:23:58  Thu Jun  5 2003 -->
<!-- Crewchief: Phil Schlabach -->
<!-- Op1: Sal Rappoccio -->
<!-- Op2: Muge Karagoz -->
<!-- Op3: Dale Stentz -->
<!-- Op4: &nbsp; -->
<!-- Op5: &nbsp; -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
<h1>New elog, it's getting very long</h1>


<!-- Date: Thu Jun 5 09:29:24 2003 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-120&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-120  width='300' align='top'></td><td>Hot channel, turns out it is East 17, channel 4</a></td></tr></table>
<!-- Author: Sal -->


<!-- Date: Tue Jul 8 09:50:44 2003 -->
<center><a href='/elog/notebooks/cmx/Tue_Jul__8_2003_094706.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-126' ></a></center>
<!-- Author: Dale Stentz -->
<!-- Comment: Tue Jul  8 09;57;25 comment by...Dale Stentz -->
<pre>This is a normal signal via a direct read of the signal pins on the pre-amp boards.</pre>


<!-- Date: Tue Jul 8 17:03:04 2003 -->
<pre>Status of the SW miniskirt: 
 
There are 7 + 1 by-passed chambers (out of the 96 total) with one of them being the "leaky" gas chamber.  George and I will attemp to recover this one soon. 
 
All signals have been checked via direct measurement via signal pins off the preamp boards with an scope.  A sample plot is given in the previous elog above.  All boards with the modifided chips are (after a few replacements) all in working order.   
 
We discoverd that one of the anode fanout wires wasn't properly covered/insulated which caused some rather shocking and surprizing trips.  It has been re-insulated+covered and, so far, there seems to be no problems with HV.  With anode and dirft volatages 5.6 KV and 2.9 KV, repectively, the anode draws 1.3 micro-A.  This appears to be smaller than previous test but there does appear to be a steady fluctuation of about +/- .3 micro-A.  Further (longer) HV test to come.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Wed Jul  9 09;47;45 comment by...Dale Stentz -->
<pre>After 17 hours at running at V_drift = 3.0 KV and V_anode = 5.7 KV, no trips on the section with the repaired 'fanout' anode.  I_drift = .45 mA and I_anode = .13 micro-A.  Please note that the above current draw in the orginal post (of 1.3 micro-A) is clearly wrong and should be .13 +/- .03 micro-A - consistant with the above.

Up next, basic grid (drift) voltage check on the NW miniskirts.</pre>


<!-- Date: Fri Jul 11 18:50:55 2003 -->
<pre>Update on NW miniskirts: 
 
Basic survey of drift High Voltage under N2 has been completed.  One half of wedge 19 is able to hold voltage at 2.9 KV with a current of .2mA.  However the second half trips quickly.  More tests to localize bad chambers/wires planed for next week.  Wedge 18 was studied in detailed.  One chamber had to be by-passed due to trips.  Now stable at 3.1 KV with current of .44 mA for +10 min w/o triping.  Currently wedge 18 is being put through long time period testing (3.0 KV, .43 mA for +25 min so far). 
 
Total number of bypassed chambers: (after drift voltage test only) for NW 
wedge 18: 1 
wedge 19: 3 [already know to be bad] + [others?]</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Sun Jul 13 17:56:53 2003 -->
<pre>Update on SW miniskirt: 
 
Leaky chamber was investigated in more detial - there appeared to be leaks at both ends even in multiple places.  RTV was applied in every area that was substeptable to leaks.  It was noted that one edge was particularlly difficult to 'get at' - in all cases generous amounts were applied.  Leak checks will be preformed tommarow (Monday) after the RTV has bonded. 
 
Update on NW miniskirt: 
 
During long period testing another chamber started to trip.  It was by-passed.  New long term testing is in progress.  Wedge 18 holding at 3.0 kV and 0.40 mA. 
 
On other fronts, George has created a test bench to check preamps.  Tests and repairs of 24 + [spares] preamp boards for the NE miniskirts is underway.  Other preparations for the NE are in progress. 
</pre>
<!-- Author: Dale Stentz, George Ott -->


<!-- Date: Mon Jul 14 13:04:28 2003 -->
<pre>Update on SW miniskirt: 
 
After a day of drying/bonding it appears that the leaky chamber is not fixed.  Simple inspection of the flow-meters shows that the return line is zero unless the supply is open all up - in which case the effect is noticible but barely above zero. 
 
Currently the SW has been reconfigured to run in "operational mode" with the leaky chamber by-passed.  Now the system flows gas normally with supply = return. 
 
Update on NW miniskirt: 
 
HV checks today on wedge #18 showed an undesired effect.  After searching for the problem, it was deturmined that one chamber couldn't hold voltage.  More to the point, the current would rise linearly with the voltage and reach 80% max current scale (.8 mA) in under 200 V (and then trip).  The chamber has been by-passed and long term HV studies are underway for wedge 18.  Test on wedge 19 to come.</pre>
<!-- Author: Dale Stentz, George Ott -->


<!-- Date: Tue Jul 15 10:56:12 2003 -->
<pre>Update on SW miniskirt: 
 
Final preparations are under way.  The gas tube which by-passes the broken chamber was been remade inorder to allow more 'slack' and to avoid possible damaged / excessive wear and tear.  As the covers were being put on, it was discovered that another anode fanout wire had a bad joint.  This is like the previous wire's problem.  It is being repaired (red corrona dope followed by electronics grade sillicon) right now.  Except for one, all the other covers are otherwise on.  The system is being flush now (still AE gas) and HV tests we procede on 7-17. 
 
Update on NW miniskirt: 
 
Wedge 18 held HV for 18 hours.  V_drift = 3.0 kV with I_drift = .40 mA.  Currently the preamp boards are being tested via George's pulser & scope scope setup.  HV tests on wedge 19 to be conducted after those tests.</pre>
<!-- Author: Dale Stentz, George Ott -->


<!-- Date: Tue Jul 15 12:02:07 2003 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-151&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-151  width='300' align='top'></td><td>CMX YMon plots from the nice long run yesterday (166037)</a></td></tr></table>
<!-- Author: Phil Schlabach -->


<!-- Date: Tue Jul 15 12:02:54 2003 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-152&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-152  width='300' align='top'></td><td>more (166037)</a></td></tr></table>
<!-- Author: ps -->


<!-- Date: Tue Jul 15 12:03:37 2003 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-153&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-153  width='300' align='top'></td><td>more (166037)</a></td></tr></table>
<!-- Author: ps -->


<!-- Date: Tue Jul 15 16:16:23 2003 -->
<pre>Update for NW miniskirt: 
 
Testing of the NW miniskirt preamps has been completed.  Bad preamps have been replaced (and are being repaired to be spares for the NE).  An estimated 26 preamps are tested and know to be good - we hope to have at least 30 (24+6 spares) for the shutdown. 
 
Update for SW miniskirt: 
 
Signal and low voltage cables have been removed and the analog fan out wire has been repaired (but needs 12 hours to fully cure). 
</pre>
<!-- Author: Dale Stentz, George Ott -->


<!-- Date: Thu Jul 17 10:11:17 2003 -->
<pre>Update on NW miniskirt: 
 
Wedge 19 held drift voltage overnight (16 hours) with 3.1 kV and .42 mA.  One chamber was (for now) by-passed.  More detailed test will be connducted to figure out how often the chamber trips at nominal voltage (currently at high voltage ~3.2 kV it trips within 10 min).  Complete NW dirft HV test will be conducted following the work on the by-passed chamber. 
 
Update on SW miniskirt: 
 
With covers on and otherwise in 'operational' condition, the SW (16+17) ramped up to high voltage without problems.  Currently, we have 
				16		17 
V_drift (kV)			3.1		3.1 
V_analog (kV)			5.7		5.7		 
I_drift (mA)			.44 		.38 
I_analog (micro-A)		.2		.2 
by-passed chambers		2		6 
</pre>
<!-- Author: Dale Stentz, George Ott -->


<!-- Date: Thu Jul 17 18:07:34 2003 -->
<pre>Update on NW miniskirts: 
 
The conclusion was to by-pass the chamber that was acting up on wedge 19.  Currently both wedges are under going long HV test.  Drift voltage 3.1 kV with  
 
I_18 = .40 mA 	(3 total by-passes) 
I_19 = .42 mA 	(4 total by-passes) 
 
so far (2.5 hours) everything is holding - no noticible fluctuation. 
 
Update on SW miniskirt: 
 
Intial ramp of HV after flush was well behavied.  After holding for an hour, we powered down and setup to look for signals of the preamp board.  At this point the analog trip twice on 17.  Both times it was a sudden spike in current without any 'spark' (no sound).  Signals were deminstrated and are consistant with what is expected.  (A plot to come soon.)   
 
After adding kapton tape to many of the wire 'joints' on the analog fanout wires the covers we put back on and each 5 degree section (of wedge 17) was invesigated all at once.  No trips even when running with V_drift = 2.9 kV and V_anlog = 5.8 kV.  Long story short, both wedges are now up in running in the normal configuration with the same values quoted in the previous elog except 
 
			16	17	fluctuation (both) 
I_anlog (micro-A)	.16	.17   	+/- .02 
 
However, for a short period of time wedge 16's current (anlog) went up (after the above conditions) to around .4 micro-A.  When the voltages were re-ramped (after switching the signal wire position) the values fell in line with the above.   
 
Longer test are in progress. More signal tests/checks to come.</pre>
<!-- Author: Dale Stentz, George Ott -->


<!-- Date: Fri Jul 18 10:28:43 2003 -->
<pre>Update on NW miniskirt: 
 
Drift HV holding steady for 19 hours. 
 
Update on SW miniskrt: 
 
Wedge 16 triped over night (17 did not - holding for 17 hours).  HV was brought back up and is holding consistant with the above e-logs.  Signals via the scope looking at the preamp signal are consitant with previous results for the several chambers looked at so far.  Plots below.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Jul 18 18;06;58 comment by...Dale Stentz -->
<pre>Quick update:

HV on both NW and SW miniskirts are holding steadly.  3/4 wedges are into a full day of testing.  Singnals via the SW preamps continues to be consistant.</pre>
<!-- Date: Fri Jul 18 12:05:57 2003 -->
<center><a href='/elog/notebooks/cmx/Fri_Jul_18_2003_120451.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-155' ></a><a href='/elog/notebooks/cmx/Fri_Jul_18_2003_120506.ps'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-157' ></a></center>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Jul 18 12;16;35 comment by...Dale Stentz -->
Preamp signals from SW miniskirts.  Note that the signal is the same as <a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=4&frame=2&anchor=09:50:44'> this elog's plot  </a> but we use one lemmo cable instead of two.





<!-- Date: Sat Jul 19 15:35:58 2003 -->
<pre>Update on NW miniskirts: 
 
Dirft voltage holding steady for 2 days now. 
 
Update on SW miniskirts: 
 
Wedge 16 (the analog voltage - not drift) triped sometime between Saturday morning and late Friday night.  Covers were removed and kapton tape was applied to all the fanout joints.  Wedge 17 held (is holding) consistant. 
 
Important: durning cover removal the drift voltage connetion (BNC to harness wire connection) was broken.  A tempary fix was eaily made by using the 'old' analog cover connection.  The wire connection will be fixed after HV in wedge 16 is working well. 
 
Currently we are running with 
 
			16		17 
V_drift (kV)		3.1		3.1 
V_analog (kV)		5.7		5.7 
I_drift (mA)		.46		.40 
I_analog (MA)		.24		.13	+/- .02 
	M=micro 
 
Detailed studies of wedge 16 will be connducted.  Studies of signals will be delayed until everything is in the clear. 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Sat Jul 19 15;37;35 comment by...Dale Stentz -->
<pre>The +/- .02 concerns the fluctuation in the current for both wedges.</pre>

<!-- Comment: Sun Jul 20 14;24;58 comment by...Dale Stentz -->
<pre>By the way, where I say analog I clearly mean anode - sorry for the confusion.</pre>


<!-- Date: Sun Jul 20 16:35:51 2003 -->
Update on NW miniskirt: 
 
Drift HV held for nearly 3 days.  It was stop so that wires could be re-arranged in a more 'normal operation' way. 
 
Update on SW miniskirt: 
 
As promised, wedge 16 was looked at in more detail (simular to the way 17 was looked at) with the anode voltage seperated into three 5 degree sections (not done in one parrelle configuration).  So far (23 hours) no trip.  One section [the lowest end of 16] is clearly the cause of the sudden shift in current  <a href= '/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=4&frame=2&anchor=18:07:34'> as reported in this elog </a> as it jumped up by a factor of 3 and then held constant at that current.  Brining the voltage down and then back up seemed to solve the problem. 
    
Wedge 16 is running at V_anode = 5.8 kV and V_drift = 3.1 kV as of 7-19 @ 17:10.  The currents are all less than .12 micro-A and a fluctuation of about +/- .02 is common to all.  
<!-- Author: Dale Stentz -->
<!-- Comment: Mon Jul 21 10;35;17 comment by...Dale Stentz -->
<pre>Voltage on NW continued to hold utill 10:00 7-21 when the system was powered down to run both wedges as normal. There were no sudden shifts or anything.  The system (for the last hour) ran with the drift voltage droped to 3.0 kV (-100 V).  Currents looked almost identical with about a +/- .03 micro-A fluctation (no sudden spikes, etc.).

</pre>


<!-- Date: Mon Jul 21 18:08:00 2003 -->
<pre>Update on SW miniskirts: 
 
In the area where the current would suddenly rise by a factor of two (in wedge 16), the cover was taken off and we made several mostly cosmentic changes.  We rearanged the wires, added kapton tape to additional areas on the anode fanout joints.  Voltage to 16 was brought up @ 15:00.  Currently no increase in current has been observed.  The current values for the three 5 degree sections of wedge 16 are all stable and around or below .1 micro-A with V_drift = 3.1 kV and V_anode = 5.8 kV.   
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Tue Jul 22 09;51;02 comment by...Dale Stentz -->
<pre>Update on SW miniskirts:

No trips or increase in currents for the last +18 hours (since setup as noted above).  Testing on 16 to continue until the afternoon when the system will be reconfigured to 'normal', assuming no problems have crept up.</pre>

<!-- Comment: Tue Jul 22 14;20;41 comment by...Dale Stentz -->
<pre>Update on SW miniskirts:

After 23 hours of testing, no change in current readings.  Testing of wedge 16 (in normal configuration) and wedge 17 will be conducted after the short access.</pre>


<!-- Date: Tue Jul 22 15:50:42 2003 -->
<pre>Update on SW miniskirts: 
 
Wedges 16 and 17 are being tested in the normal configuration and holding voltage as normal.  V_anode =  5.8 kV and V_drift = 3.1 kV.  The anode currents for both are both just below .2 micro-A with a fluctation of about .04 micro-A.  Test began at 15:20 and will continue until the end of the week barring any possible problems.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Tue Jul 22 16;45;21 comment by...Dale Stentz -->
<pre>wedge 17 [just anode] triped within an hour of testing.  Both wedges take fast ramping without triping.  Watching the currents there doesn't seem to be any sudden spikes, etc.  The drift voltage has been lowered to 2.8 kV with anode only down to 5.7 kV.  This makes the current around .4 micro-A - if it trips it should do it quick.</pre>


<!-- Date: Wed Jul 23 09:59:14 2003 -->
<pre>Update on SW miniskirt: 
 
Both wedges are stable and holding voltage.  The previous settings of 5.7 and 2.8 kV (anode and drift, resectively) caused no trips for the full hour and a half it was tested.  The voltages were lowered to 5.5 and 2.9 kV as of 18:00 7-22.  Currently, the currents are fluctuating less than .02 micro-A - no sudden spikes etc.  In fact, current levels are both aproximately .1 micro-A.  Voltages have been increased both by 100 V without any change.  HV test will continue throughout the day - 'stand-by' tests where the system is lowered to stand-by voltages for 30 min and then brough back up will also be conducted. 
 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Wed Jul 23 12;30;58 comment by...Dale Stentz -->
<pre>quick up date - voltage continues to hold on SW with currents steady and constant with previous readings.</pre>

<!-- Comment: Wed Jul 23 16;52;30 comment by...Dale Stentz -->
<pre>Quick update -

Voltage has been brought down (or turned off completely) and brought back up, but both wedges are performing well and holding voltage.  Signals will be tested which will introduce more restarts.</pre>


<!-- Date: Thu Jul 24 09:35:29 2003 -->
<pre>Update on SW miniskirt: 
 
Both wedges continue to hold voltage and maintain constant current even after periods of being turned off or set to stand-by.  Tests to continue.</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Thu Jul 24 16:28:33 2003 -->
<pre>Update on the SW: 
 
Voltages holding fine after a series of shut-down + start-ups.  Signals via the preamp board are good and consistant with before.  A switch between the NW and SW (location and gas running). 
 
Update on the NW: 
 
While re-arrangeing wires, we came across an anode wire (connected to the anode 'pin' of the chamber) which was difficult to get off.  Unfortinately, there was sufficent pull to acutally remove the anode pin from its plastic base.  The N2 in that area has been tempurally by-passed to save N2.  The chamber will unfortinately need to to be by-passed completely.  Gas will either have to be by-passed or a sealent will be applied over where the anode pin was. 
 
We will in the future be careful with the forced applied and use a combination plyiers + pull method to insure that we do not lose another chamber in this uncanny and unfortinate way. </pre>
<!-- Author: Dale Stentz -->


<!-- Date: Fri Jul 25 09:50:25 2003 -->
<pre>Update on the SW: 
 
Voltage continues to hold with steady currents.  Both wedges are running at 5.6 and 3.0 kV for anode and drift voltages.  Signals (from the preamp board) are solid on all the tested preamp boards.  Tests will continue into the weekend. 
 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Jul 25 14;04;49 comment by...Dale Stentz -->
<pre>The SW continues to behave well.

Update on the NW miniskirt:

The damaged chamber was successfuly by-passed (both HV and gas).  2/3 of the tedious work on re-arranging the wires on the NW is done and will be finished up by Monday.  
</pre>


<!-- Date: Sat Jul 26 16:01:22 2003 -->
<pre>Update on NW miniskirts: 
 
Wires have been rearranged - both wedges are ready for AE gas and complete HV tests. 
 
Update on SW miniskirts: 
 
Wedge 17 appears to have triped over the night.  As the system has been running well (low currents with low/steady fluctuations) this proably is just a statically allowed triped (perhaps due to humidity changes, etc.).  Currenly both wedges are up and running as before.  Signals on the scope continue to look normal and as before.  The SW appears to be ready for a switch with the NW.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Sun Jul 27 14;29;32 comment by...Dale Stentz -->
<pre>Update on SW miniskirts:

Everything continues to hold and maintain current levels etc.  Last phase of testing will continue to Monday morning.</pre>


<!-- Date: Mon Jul 28 10:48:55 2003 -->
<pre>Update on SW miniskirts: 
 
Final check and inspection of the SW has been proformed - ready to move on to more detailed studies on the NW.  All external wires have been removed and everything else is "firmly attached" to the miniskirt harness/frame. 
 
AE gas has been shut off at the main valve/flowmeter @ ~10:00.  The other valves are open but of course not recieving any supply/incoming gas.  Removing the gas lines is the only thing physically holding the miniskirt from being switch with the NW.  The NW is basically ready to go as soon as the SW is moved.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Aug  8 10;55;41 comment by...Dale Stentz -->
<pre>Update on west side miniskirts:

The SW and NW have switched positions in the assembly hall.  Currently the NW is being flushed with AE gas (this began during the afternoon of 8/6/03).  Preliminary HV testing will be conducted on Sunday.  The SW will undergo a leak rate check (currently being feed N2).</pre>
<!-- Comment: Fri Aug  8 14;03;35 comment by...Dale Stentz -->
<pre>I incorectly stated the AE gas start up - it was the morning of 8/7.</pre>
<!-- Date: Fri Aug 1 13:09:00 2003 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-158&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-158' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-159&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-159' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-160&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-160' width='300'></a></center>
<!-- Author: Phil Schlabach -->
<!-- Comment: Fri Aug  1 13;09;54 comment by...ps -->
<pre>YMON plots from run #166927 (going on now).</pre>




<!-- Date: Mon Aug 11 16:13:46 2003 -->
<pre>Update on NW miniskirt: 
 
The high humidty in the assembly hall made intial HV checks less than easy for most of the day.  Basic drift HV test underway.  Searches on both wedges reveal 2 more possible bad chambers.  They both trip (one is a loud + visible sparker - it was tracked down quickly; the other is more of an internal silent or 'thud' trip) rather quickly and often (under 5 min for several trials).  These will be by-passed (for the time being) until the rest of the system is stable and without trips.  The suspect chambers will then be re-tested realtive to a known good chamber.</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Fri Aug 15 13:37:06 2003 -->
<pre>Update on NW miniskirts: 
 
After further testing, 3 additional chambers had to be by-passed (HV problems for the cathode/grid voltage).  The reason for this sudden loss in chambers (known to be good before) is unclear.  At least 1 chamber was 'saved' by cleaning the face-plate and the cathode jumper wires.  However, the additional 3 could not be saved.   
 
Currently, wedge 18 is being investigated in detail with just cathode/drift voltage checks (2/3 of the bad ones came from this wedge).  Longer testing is needed (voltage is set to either 3.0 or 3.1 kV).  Cleaning and occasional retesting of bad chambers will be conducted in an attemp to possibly recover one or two more chambers back (for both wedges). 
 
Wedge 19 has moved into both anode and cathode HV testing - so far the wedge is responding well.  Drift voltage 3.1 kV with a current of .40 mA.  Anode volage at 5.7 kV with .15 microA current (current starts at about .30 microA but works its way down in a couple of minites).  The wedge takes fast ramping and has been on for over 45 min at one time (longer testing to start once wedge 18 is ready for full HV testing). 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Aug 15 16;48;42 comment by...Dale Stentz -->
<pre>Update on NW miniskirts:

Some bad cathode jumpers were removed which appears (at the moment) to have elminated the last problem with wedge 18.  Right now both wedges have both cathode and anode HV and are being tested at 3.1 and 5.7 kV, respectively.  Wedge 19 has held voltage for up to 1.5 hours without any trips so far.  

Currents:

wedge	cathode/drift		anode
19	.40 mA			.15 microA
18	.42 mA			.16 microA

There is virtually no variance in the cathode current and roughly a +/- .02 microA (steady - not jerky) in the anode.  Assuming no problems show up the system will be left on overnight for the start of long term testing.
</pre>


<!-- Date: Sat Aug 16 16:43:39 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 19 triped over night.  Wedge 18 "developed" cathode HV problems and the sections thought to be good (about 5/6 of the wedge) were left on overnight at 3.1 kV.  This also triped. 
 
As wedge 19 seems to be 'ahead' of 18, the focus is on finding/repairing problems with the cathode voltage on 18.  Seemly wild and varrying results occured by otherwise simple changes.  For example one chamber went from triping right away (at around 400 V) to holding steady at 3.1 kV by a simple switch [not replacement] of the grid/cathode HV jumpers (the adaptor from the resistor box to the grid/jumper system). 
 
Tests to continue on 18 until problem is solved or long term testing is needed.  Assuming we get to that point, we will attemp long term studies on wedge 19 (both anode and cathode HV). 
</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Mon Aug 18 11:01:02 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 19 held voltage for about 40 hours over the weekend.  Cathode (anode) voltage was 3.0 (5.6) kV.  The currents were as expected - .38 mA for cathode and .16 [from ~.20 to .14 over the start to finish] microA with a fluctuation within the measuring persision of .01 microA.  Long term tests will continue when ever there is a long period of time aviable.  Otherwise, the HV will be "doubled teamed" on wedge 18. 
 
Wedge 18 still has unresolved cathode problems.  The most common effect is high fluctuations in the current.  The problem comes in two varieties: 1.) a jerky quick and realtively large 'spike' in current - sometimes goes away and comes back (will lead to a high likly hood of a trip eventally) and 2.) extremly quick 'occilation' of current - perhaps an indication of a bad wire or wire connection.  In any event, studies continue.  When long term testing is needed for 19 (at the end of the day etc) it is hoped that a potenial 'good' section can be tested.   
</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Tue Aug 19 10:05:46 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 19 held high voltage (anode & cathode - same values as above) for 20 hours.  Two 'one-thirds' of the 18 were brought up to 3.0 kV on the cathode/drift.  Both triped before this morning but were holding steady without fluctuation.  One of the problems with a 'shaking' current reading has been fixed with wire replacement but now there may be an intermenant trip problem.  Work will consintrate on just wedge 18 again - the reamining 'one-third' wedge has been inconsistant. 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Tue Aug 19 17;43;06 comment by...Dale Stentz -->
<pre>Update on NW miniskirts:

Work today pin-pointed two problems which appear to be due to a "not so good" chamber which fluctuate and draw too much current realtive to a normal/average chamber.  However, these chambers are slow to trip.  Most likly we will take what works and start on long term testing.  In paralle, we can test these chambers and deturmine the trip rate, etc.

Currently wedge 18 (minus two temp. by-passed chambers) is holding at 3.1 kV with a current of .41 mA.  Wedge 19 continues to be stable and consistant.  Long term testing over night will consintrate on the (thought to be) "good" chambers.
</pre>


<!-- Date: Wed Aug 20 17:38:35 2003 -->
<pre>Update on NW miniskirts: 
 
Long term testing from the previous night (see previous elog) was successful.  Both held for 16 hours.  Now that we had a good "base" we looked at the tempary by-passed chambers in addition to the previouslly by-passed chambers (all 11).  Results: 
 
2 temp. by-passed [on wedge 18]:  one fluctates and draws more current than it should at ramp up but stabalizes.  The other draws more current (a solid factor of 2) but its fluctation is realtively mild throughout.  Both held 3.1 kV for +30 min.   
 
Previous by-passed chambers on wedge 18 (6 in number) all triped under a varity of circumstances. 
 
Oddly enought wedge 19 had 3/5 chambers not trip on 2 trials both lasting 45 min.  One of the three draws about 3 times as much current as it should.  The other two are almost ideal.  They draw 9 microA at 3.1 kV, no fluctuation, good on a quick ramp up.  I believe that these were by-passed already.  Thus (the logical conclusion) they may trip on anode testing.   
 
Currently the 2 potenial recovered temp. by-passed chambers from wedge 18 are not by-passed and together with the entire wedge.  The system seem to fulcuate at the start but is holding at 3.1 kV with a .42 mA current draw on the cathode.  The anode has been turned up to 5.4 kV (about .08 microA draw).  Orginaly the anode triped when it was set to 5.6 kV and was drawing way to much current (roughly a factor of 10).  As this is an anode problem this will late till later (it seems to be stable at 5.4 but that may be droped to 3.0 kV if it trips). 
 
In addition, the 3 previous chambers that were by-passed are now in series with the rest of the wedge (anode is not hooked up).  It intially triped at 3.1 kV but was holding at 3.0 kV with a current draw of .43 mA.  A small fulctuation (+/- .01 mA) is noticible on ramp up but seems to die out.  If the system contiues to hold the anode may be raised to 3.0 kV (if at all).  Testing to continue over night.  It is hoped that out of the 2+3 chambers that at least 2 (perhaps 3) can be recovered.  The ones that draw more current then they should are, historically, more likly to trip, etc.</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Thu Aug 21 15:00:27 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 19 with the 3 additional chambers (previously by-passed) held (cathode HV) for 20 hours at 3.0 kV (boosted up to 3.1 kV for the last 4 hours).  The anode which was set to 3.0 kV triped but this is not a strong indication of anything yet.  The system was also able to handle an fast ramp after the system was turned off for a while after the test. 
 
For wedge 18 the wedge which drew more current than expected did trip over the night (as history predicted).  The other chamber held for 20 hours at 3.0 kV.  Both seemed able to take a fast ramp as well. 
 
Note that both chambers that draw more than they should (one in each wedge) seem to drop to normal current after some time and essically if the there is an applied anode voltage.  In the case of the one in wedge 19 (which was re-tested seperately for an hour) showed no sign of drawing more current than before.   
 
Currently, wedge 18 is being tested with both cathode and anode HV.  It seems that the anode is unstable.  In any case, the wedge plus the chamber that passed the overnight test are together and holding voltage at 3.0 kV.  The one that triped is seperated but holding the same voltage.  The anode is set to 5.4 kV.  As for wedge 19 the cathode is being tested again.  If all goes well the 3 chambers will be re-insturmented fully.  Indivisual test on these chambers is likly to be done first. 
 </pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Thu Aug 21 17;18;04 comment by...Dale Stentz -->
<pre>Seperate test for each of the three chambers being offically 'un-by-passed' require more movemnt of wires then desired so the entire wedge (#19) is being HV tested.  

details for wedge 19

V_Drift = 3.0 kV	I_Drift = .42 mA
V_Anode = 5.6 kV	I_Anode = .15 +/- .2 microA

Dirft = Cathode and the uncertainty in the anode current is the natural (steady, not jerky) fluctuation in the reading (basically normal).  Voltages being held for half an hour (so far).  

Wedge 18 is undergoing more cathode tests to deturmine the trip rate of the one potential (to be) by-passed chambers.  No trips so far but it was unstable during ramp up.  The wedge (everything else) triped about 3 min into testing but stablized and has been holding for 30 min.

Full HV test with anode will be conducted Friday (on 18 as well as 19).  Long term testing planed into the weekend.
</pre>

<!-- Comment: Thu Aug 21 17;19;39 comment by...Dale -->
<pre>Duh - for the uncertainy in the Anode current reading (I_Anode) we ment +/- .02.</pre>


<!-- Date: Fri Aug 22 15:13:57 2003 -->
<pre>Update on NW miniskirts: 
 
Only the cathode HV on wedge 19 held through the night.  The anode for 19 trips but without "warring" - in other words theres no sudden chaos in the current, it just trips.  It now appears that wedge 18 without the two tempary by-passed chambers now trips.  In addition, the temp. by-passed chamber that drew to much current triped over night as well.  We tried to get it to trip in front of us but no success. 
 
Wedge 19 has its anode split in 3 so that we can effectively break down the anode volatage to see where the problem is coming from.  (The cathode is stil all together.)  So far no trips for 1.5 hours with V_anode = 5.7 kV and V_drift = 2.9 kV.  Currents are consistant with eachother and the fluctuation is consistant with what is expected (slow +/- .02 micrioA fluctuation). 
 
Wedge 18 has also been split into 3 but just for HV cathode/drift tests.  No breakthroughs/developments yet.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Aug 22 17;18;22 comment by...Dale Stentz -->
<pre>Except for one trip which could not be reproduced, wedge 19 seems to have no obvious anode HV problems.  In partiuclar since the three "re-insturmented" chambers are all in the same third and this has not triped (also no spikes, etc.) this is a good sign.  The system was also turned off and then started up again and neither triped nor had any wild currents.  Wedge 19 will be left as it is (V_drift = 2.8 kV and V_anode = 5.6 kV) over night to see if anythings trips again.

Wedge 18 is less strightforward.  Often times chambers will go into a long period of stabalization.  But when we restart there can be periods of triping quickly (within the frist 3 min.).  One of the thirds seems the worse.  This will be left on overnight to see if it trips.  </pre>


<!-- Date: Sat Aug 23 17:28:18 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 19 in its configuration (discirbed above in the comment) held HV for well over a day.  It has been set to normal with one power supply for anode.  It has been holding since 1600 with 
 
V_anode = 5.6 kV	I_anode = .13 +/- .02 microA 
V_drift = 3.0 kV	I_drift = .41 mA 
 
One of the tempary by-passed chambers has 'offically' been put in as part of the wedge.  The only remaining chamber considered to be by-passed is undergoing studies right now.  There was a somewhat significate cathode problem in one of the sections (it would trip quickly at 400 V).  Once the problem was reduced to 3 wedges and two jumpers, a quick clean up of the face plates seem to solve the problem.  It is now thought that the section accross from this one by have an intermentent trip problem.  The bottom line is that wedge 18 will have to be focused on for at least the start of next week. 
</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Mon Aug 25 12:39:55 2003 -->
<pre>Update on the NW miniskirts: 
 
Wedge 19 held high voltage for over 40 hours.  The current readings are consistant with above and the system responces perfectly when turned off and then restarted.   
 
Wedge 18 remaining temp-by-passed chamber offically became by-passed as it triped twice over the weekend.   More cathode HV tests are in full swing. 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Mon Aug 25 16;21;32 comment by...Dale Stentz -->
<pre>A bad jumper (cathode) wire in wedge 18 was removed and that seems to make things a lot smother.  The entire wedge was tested at 3.1 kV and held with a current of .41 mA.  It was noted that it did have a fluctuation of about +/- .02 mA for the first couple of minutes (no trips or wild current spikes).

The setup with three differnt anode HV connections was setup and is being preformed now.  The fluctuation at startup (on the cathode) is non-existant with the anode HV there.  The anode currents look fine and show consistant fluctuations with the expected.  No trips on anything yet.  Testing to go on overnight assuming no major problems, etc.
</pre>


<!-- Date: Tue Aug 26 10:37:51 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 18 in its 3 anode + 1 cathode HV configuration held voltage overnight and has passed the 17 hour without triping.  This being said there does appear to be one problem with one of the 'thirds' (the other two anode sections draw equally small amounts of current and show no bad signs).  Namely that it will occassionally start to draw too much current (~ 4 microA, about 40 times larger than when 'normal').  This raise in current comes with about the same realtive fluctuation as when it is drawing current consistant with the other two.  It has also been observed to go back down to its normal state.  Obviousally that section will be rearranged (move wires, inspect for weaknesses, etc.) and the problem located (hopefully) today. 
</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Wed Aug 27 08:55:32 2003 -->
<pre>Update on NW miniskirts: 
 
Several changes were made yesterday.  A pre-amp board had to be replaced after a signal wire was torn from its soder limb.  A suspected bad filter box was checked and shown to be in good working order.  As reported above, the sudden factor of ~40 increase in current for one of the 'thirds' anode HV section seem to be replaced by a non-triping current spike (maybe 1 every 20 min) after the introduction of a differnt filter box (i.e. the one checked above).  HV held overnight with V_anode = 5.6 kV and V_drift = 3.0 kV.  All currents were consistant with each other and no current spikes have been seen.  Test continues into the 16 hour.</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Wed Aug 27 14;35;38 comment by...Dale Stentz -->
<pre>There have been several runs which show that the suspected bad 'third' anode section is behaving well.  We have been unable to reproduce current spikes or sudden increase in current levels.  The reasons could be anything from the new filter anode box to the re-arranging/organization of anode wires.  

After the long testing, we setup to relook at just the cathode in detail.  Recall that the current (while a consitant value and not triping) did fluctuate much more than normal (normally you can't see any).  The cathode was split into three while the anode was recombined into one.  All sections were brough up to 3.1 kV and after stablizing (&lt; 1 min) all currents show a vast improvement - the variation is less than +/- .01 mA (about a factor of 4 better).  When the anode is brought up to 5.4 kV there is no detectable variation in the currents.  When suddenly shut off, vary faint signs of fluctuation occur (a bit after all the voltage has been droped).  The current plan is to keep testing until we are satified or have found the problem again and have solved it.
</pre>


<!-- Date: Thu Aug 28 12:19:26 2003 -->
<pre>An intermediate trip was discovered again and quickly trackdown.  The problem chamber has a very slight crack in its capacitor on the face-plate.  There is also some sealent gunk around the anode pin.  The current is normally realtively low - current spikes (and trips) occur very fast.  This chamber will be by-passed for now so that the rest of wedge 18 can be checked out.</pre>
<!-- Author: Dale Stentz -->


<!-- Date: Fri Aug 29 11:18:47 2003 -->
<pre>Update on NW miniskirts: 
 
The chamber from the above elog was completely by-passed.  (This conserns wedge 18.)  Unfortinately when moving around the harness jumpers for the cathode HV a signal wire on the adjacent board was broken.  The pre-amp board was quickly replaced this morning.  HV tests took place over night on the cathode.  It appeared that the trouble section of wedge (the "last third") triped again.  The other two sections held without current shifts, etc.  We expect to find the problem quickly assuming that we can get it to trip again. 
 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Fri Aug 29 16;49;53 comment by...Dale Stentz -->
<pre>Via previous tests on wedge 18 we discovered another chamber which drew around 2 to 3 times the normal amount.  The fluctuation in the current was noticible but not wild.  No hard current spikes were noticed and the chamber would not trip under 3.1 kV for 1.5 hours.  However, when the anode HV was turned on the current in the cathode droped to the normal/average value and showed no fluctuation what so ever.  &lt;a href= 'http://www-cdfonline.fnal.gov/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=4&frame=2&anchor=08:55:32'&gt;
This effect was notice before.  </a>   It is not clear why this effect appears to be so dramatic but since the wedge is "ideal" under its true working configuration (both HVs) it will be noted but not delt with.  

A loose grounding wire in wedge 19 was fixed.  The connection will hold but is not strong and can be easily pulled off the grounding connection on the chambers faceplate.  

Currently both wedges on the NW are holding HV (over an hour).  with V_anode = 5.6 kV and V_drift(=cathode) = 3.0 kV.  The currents on the cathode show no fluctuation and are both around .40 mA.  The currents on the anode show a small but 'healthy' (expected) fluctuation of about .01 microA with a current values of I_19 = .15 and I_18 = .10 microA.  It is good to note that wedge 19 has 2 by-passed chambers while wedge 18 has 8 - thus the values are inline with what is expected.
</pre>

<!-- Comment: Fri Aug 29 16;53;14 comment by...DS -->
That's odd.  Let me try the link again:  

<a href=
'/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=4&frame=2&anchor=08:55:32'>
  This effect was notice before. </a> 


<!-- Date: Sun Aug 31 14:36:28 2003 -->
<pre>Update on NW miniskirts: 
 
Wedge 19 held voltage for the last 2 days but wedge 18 triped.  Both the anode and cathode triped so it is unclear what caused the problem.  Although studies show that turning the anode off suddenly (faking a trip) causes a very small increase in current (~.02 mA) and negligable fluctuation in the dirft, does imply that a cathode trip is most likly.  There have been fairly long periods of testing on 2/3 of wedge 18 so the the HV has been split to take the "2/3" section and then the remaining "1/3" section into two seperate HV systems.  This split also includes the anode so that the systems are independent of each other.  Both sections show fluctuation on the cathode on ramp up but stabalized within 1 min.  As wedge 19 seems good to go, the focus will again be on 18. 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Mon Sep  1 10;57;05 comment by...Dale Stentz -->
<pre>The system has been holding voltage for about 21 hours without trips or other problems.  The system was running with (V_drift, V_anode) = (3.0, 5.4) kV but is now focused on testing the anode with (2.8, 5.7) kV.  In this case, (as the fake anode trip test shows that the system should hold without problems) it is supected that a complete trip of both systems implies that the cathode triped for sure.
</pre>

<!-- Comment: Mon Sep  1 15;16;44 comment by...Dale Stentz -->
<pre>Wedge 18 continues to hold voltage.  The values have been adjusted such that V_anode = 5.6 kV and V_dirft = 3.0 kV.  Testing at these values will continue until Tuesday morning.  The currents are all steady and 'normal'.  A fluctuation in the drift is still noted whenever the anode HV is turned off.  When the system is restarted (after turning off both HV) it handles the rampup in an ideal fashion.
</pre>


<!-- Date: Sat Sep 6 12:54:45 2003 -->
<pre>Update on NW miniskirts: 
 
On Tuesday it was decided that wedge 18 was more or less ready for covers and real operation mode.  Several problems came up - namely it was discovered that the legs that hold up the covers were realtively short (or equally that the pre-amp board legs were too long or some combination in between).  In any case, they all "fit" although there are some basic problems.  First only gravity is holding them down - washers & screws won't work.  This is not such a big problem but the fact that several legs are all together missing certainly is.  Luckly the covers have been jury-riged just enough so that they support each other.  Another problem is that one of the 'windows' on the covers does not align well (the signal cable and LV cable won't fit.  Rather than modify the cover, it has been tilted enough so that the cables can be attached.  In any case, these covers will most likly need to be adjusted when we attach the cables in the collision hall. 
 
During testing of wedges one of the HV cable to 'jumper' harness wire for the cathode was damaged.  As there is no 'backup' anode wire for us to use we decided to use one of the testing wires.  It is possible that we may take off the cover and remove it from the area to resoder the broken connection but this would likly be done once the miniskirt was in place and we had debated the pro and cons of such an action.  For now what we have will work in B0. 
 
After the covers were put on the system was flushed until Thursday afternoon.  At that point testing on both wedges was started.  Long story short, wedge 18 started to trip on time scales on the order of &lt; an hour.  (Wedge 19 had no trouble and held high voltage with covers for +1 day.)  Several high current and somewhat wild chambers were discovered in the 'well behaved' part of the wedge.  In any case, the true triper was discovered and failed to hold at 2.6 kV for &gt; 10 min.  It was by-passed.  This brings the # of by-passed chambers to 9 on wedge 18 and 11 for the entire NW mini.  It was suspected that the other 'wild' chambers (which never triped when studied) would behave with the anode HV turned on.  This hypothesis proved correct.  In fact current levels actually droped by factors of 2 and 1.5 to nominal levels when the anode was turned on.  As observed before, the fluctuation on these chambers was completely eliminated.   
 
Wedge 18 has been running at V_drift = 3.0 kV and V_anode = 5.6 for 19 hours.  Currrents are consistant with what is expected. 
 
One general observation that was noted as soon as testing started on the covered NW is that the fluctuation in currents (for wedge 18) as a whole was barely noticible (< +/- .01 mA) with just the the cathode HV (after the system stablizes - within 1-2 minutes). 
 
Wedge 18 will be test more before both wedges will be brought online and final testing will begin.  Idealy the miniskirts will be tested through Monday (testing depends on when the miniskirts will be inserted). 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Sat Sep  6 15;51;46 comment by...Dale Stentz -->
<pre>Currently (as of 15:00 9/6) both wedges for the NW miniskirt are holding HV.  With V_drift = 3.0 kV and V_anode = 5.6 kV,

		I_drift (mA)		I_anode (microA)
wedge 19:	.43			.16 +/- .03
wedge 18:	.38			.08 +/- .02

HV tests will continue until (at least) 3:00 Sunday - the system will be shut off to avoid the power-outage on Monday morning.  The system will be flushed quickly with N2 before insertion - the extact day and time for this is unknown at this point.
</pre>


<!-- Date: Sun Sep 7 16:43:02 2003 -->
<pre>Update on NW miniskirt: 
 
Wedge 19 held perfectly again but 18 triped.  When looked at in detail 18 seemed to have wilc current swings the effect (or perhaps cause) was the voltage was not holding steady.  After the cable connections were checked, etc. 18 was broken down into thirds.  A diffrent problem seemed apparent - then went away as quickly as it came.  Next, the large current swings could not be induced again.  Only 1 third had any noticible current fluctuation but this was a factor of 4 smaller and stabalized within 2 minutes.  Application of the anode HV elimiated any and all current movements in the cathode.  (Note that the wild current swings in the cathode above were completely ineffected by turning on the anode HV.) The system (wedge 18) has been holding HV for just under a half hour.  Testing will continue until later tonight when the HV testing in the assembly hall will offically stop. 
</pre>
<!-- Author: Dale Stentz -->
<!-- Comment: Sun Sep  7 19;49;21 comment by...Dale Stentz -->
<pre>We got wedge 18 to hold for 3 hours when in 3 sections (split up for the cathode only).  When they were put together the system responded fine until it got to around 3.0 kV when it triped.  Upon re-ramping the chamber developed its wild cathode HV problems again.  This will be the first thing to be looked at after the west side is inserted in the collision hall.
</pre>


<!-- Date: Mon Sep 8 15:43:18 2003 -->
CMX miniskirt gas has been disconnected for both NW and SW. I have capped all the gas flows. I have also disconnected all the HV.
<!-- Author: Sal R. -->


<!-- Date: Tue Sep 9 14:03:38 2003 -->
<pre>Both NW and SW miniskirts are ready for insertion into the collison hall.  The only thing left to be done is to put the counters on (this will not be done by us although we may help).  This along with the actually insertion of the westside will be done tommarow (Wednesday). 
 
Work has begun on the NE miniskirt.  So far only continuity checks and general setup of the area has been done.  Work on the NE and later in the week the SE will continue. 
</pre>
<!-- Author: John Strologas, Dale Stentz -->


<!-- Date: Sat Sep 13 16:19:17 2003 -->
<pre>Summary of work on the miniskirts durning the previous week (first week of shutdown): 
 
The NW miniskirt was inserted on Tuesday morning.  The 'tallest' cover hit a pipe but served its function and protected the boards/chambers.  The varity of wires for CMX and CSX (which has been completly installed) have been properly 'orgainized' in the arch.  In addition, black plastic "elephant nose" wire tube was use to protect the wires inbetween the arches and the miniskirt. 
 
Insertion of the SW will occur later in the shutdown (~ 3 weeks).  It is ready to go when needed. 
 
The NE underwent cathode HV tests.  One chamber was by-passed.  Tests on Friday showed no trips and so the NE was split into 4ths and was holding as of 19:00.  Assuming no new bad chambers the NE will start to be insturmented next week. 
 
On the SE we began to reorganize the last 5 degrees which was not on durnign pre shutdown oberations.  Tests will be conducted on this next week.  George made a good stand-alone system for testing signal wires.  A test pulse is sent in through the 4 signal wires of a spare preamp board.  The signal is reporduced upstairs via the TDC readouts and has the same shape as a 'real' signal.  Via preshutdown checks there are ~ 9 chambers which do not give a signal at the TDC readouts but don't appeared to be by-passed.  This will be looked at in detail after AE gas is turned on durning mid/late next week. 
 
The NW has been briefly checked with HV cathode tests.  Wedge 19 seems good (long term test extected next week).  Orginally when wedge 18 was tested it triped at ~ 600 V.  When broken down and searched for the problem always seem to go away.  The suspected trouble section was again observed to have larger than desired current fluctuation (in the cathode).  Wedge 18 wild current spikes were of the mild varity (+/- .02 mA) and these fluctuations did stablaize at ~ 50 min.  However, a bad chamber was by passed when it caused the system to trip at 3.0 kV (&lt; 1 min) and 2.9 kV (< 15 min).  Later in the testing the low voltage trip right away problem came back.  It was tracked down to a stack of 4 chambers.  However, the problem would go away as soon as it came.  In addition, the effect is less when there are less chambers.  Thus for the 4 chambers the system would trip at ~ 1.2 kV on a realtively quick ramp-up.  This area is under investigation as is another potenial.  These problems al occur in the second 5 degree section of wedge 18.  So far 6 chambers have been by-passed out of the 16. 
</pre>
<!-- Author: John Strologas, George Ott, Dale Stentz -->


<!-- Date: Thu Sep 18 10:41:09 2003 -->
<pre>Update on Minskirt/CMX work durning access: 
 
The water driping has stoped on the NW.  I am not aware of any fix (or inspection) that was made.  A tarp still remains to collect water and HV have restarted. 
 
Gas (argon-ethane) remains off.  Its return is expected next week.  The gas techs were working on a solution for the low pressure (effective low flow rate for the miniskirts) - a status of their work will come soon (hopefully). 
 
Currently both the NE and NW are being tested with cathode HV.  We made an additional by-pass on the NE on a chamber which trips on a fast ramp (turning the HV up realtively quickly) and makes a visuable (and loud) spark. This chamber is being tested seperately to see if it will trip under HV for long periods of time.   
 
Wedge 19 on the NW has a larger than noticed before fluctuation in the current of about +/- .070 mA.  Wedge 18 which had a varity of problems occur just before the access started seems to be under control.  One area may have an intermitent triping chamber (triped ~twice since the NW was put in) but this may be a toleratable rate. 
 
Previous to the shutdown, TDC test showed 3+10 dead signals.  When inspected it was seen that only 3 chambers had been by-passed.  8 of the 10 chamber's radekas have been examined and half were bad (these were replaced of course) the other 4 have been put back with the documentation that we need to check the other possible places where the signal could die (anode wire, ASD, etc.).  Work on this will pick up once AE gas is turned on. 
 
Insturmentation of the NE will begin Friday.  Other work such as setting up HV cables, etc. is being done (and planed) as well.</pre>
<!-- Author: John Strologas, Jason Jarrell, George Ott, Dale Stentz -->


<!-- Date: Fri Sep 19 16:51:19 2003 -->
<pre>Upate on CMX/miniskirts durning access: 
 
All 3 miniskirt 30 degree sections are holding voltage and seem to be proforming well. 
 
NW - currently running at 2.9 kV with covers on and 
 
I_wedge19 = .412 +/- .02 mA 
I_wedge18 = .340 +/- .005 mA 
 
Previouslly NW was running for ~2.5 days without triping. 
 
The SE and NE are running flawlessly as well, ~3 days without trip (with exception to the by-passed chamber on the NE which trips on rampup). 
 
The gas issue appears resolved.  Del said that the flow rate for the miniskirt was conistant with previous operations.  Note that the overall pressure/flowrate was increaced for all of CMX.  Many of the miniskirt returns are reading some activity.  AE gas should be started on Monday. 
 
Dervin was consulted about 8 more HV cables for the miniskirts which will occupy the 10 degree section channel which were not installed.  In addition, the spare(s) HV cables will be used on the SW so that we can by-pass the bad HV cable coming from upstairs to the crate on the SW arch.  Recall that currently the wedge 20 (10 degree on the NE) is effectively wedge 17 (SE) for the purpose of HV.  Things will be reset and each miniskirt wedge will have its own HV cable/connection. 
 
Next week we will go after signal problems on the SE, insturment the NE, test signals on the NW, and seting up and testing the HV cables for the 3 installed miniskirts. 
</pre>
<!-- Author: John Strologas, Jason Jarrell, George Ott, Dale Stentz -->


<!-- Date: Mon Sep 22 17:19:00 2003 -->
<pre>Summary of CMX work durning access: 
 
We looked at the channels that had a dead signal before the shutdown.  Using George's pulser board we tested the trouble areas and found that there were no obvious problems.  As the setup testes the cable -&gt; ASD -&gt; TDC crate we conclued that the ~5 dead channels that were not due to bad radicas have problems that are localized on the board.  Of course, as soon as we get AE gas we will check the signals directly.   
 
All installed miniskirts held voltage over the weekend and the NE and NW continue to do so now.  In addition, the NW is now under control of the upstairs powersupply (i.e. the way it should be).  There is only the one anode/cathode pair so both were used as cathode (drift) HV for each wedge.  In order to get around a hardcoded software limitation we had to switch the 10 degree dirft HV from upstairs with that of the anode of the 30 degree section for the NW.  Thus, (looking at the HV cables in the couting room) we switch ANODE 01 with DIRFT 07 (and vice versa).  What would have powered wedge 20 now powers 18.  And what would have powered 18+19 just powers 19. 
 
Wedge 18 doesn't seem to be able to get all the way up to the set current of 2.9 kV (its at 2.889 kV).  Wedge 19 does not have this trouble.  This will be investigated by an expert soon. 
 
Currents (with V_drift = 2.9 kV) are 
I_19 = .422 mA 
I_18 = .344 mA 
 
AE gas should be on but the offical word was that it was still off durning mid-day.  HV cables for the miniskirt including a spare will be made (hopefully) sometime later this week or next week. 
 
Two ASD cards were inserted into the NW crate.  These were for wedges 18 and 20.  We tried to move 20 (which only needs 8 channels) to 19 but we did such a great job inserting the board that we could not get it out!  The front connections were not put in as we still need a ASD board for wedge 19.  Work on the ASD cards will start up again to make sure we have enough for all the miniskirts.  It appears that the NE will need 3 as well (the SE is fine). 
</pre>
<!-- Author: John Strologas, Jason Jarrell, Ingyin Zaw, George Ott, Dale Stentz -->


<!-- Date: Wed Sep 24 17:51:10 2003 -->
<pre>Update on CMX work durning access: 
 
HV held without trips but was turned off before AE gas was turned on at around 13:00 today.  The NE was insturmented with HV anode wires and is now ready (along with the NW) for full HV testing once the chambers are flushed.  HV will be turned on &gt; 8:00 on 9/25.  Its my understanding that the gas seperate gas lines (which were put into the north) for the south are not installed yet.   
 
The SE miniskirt was moved to allow access to the bottom 'pit' so that a new floor grateing can be installed (and supported!)once the miniskirts are aligned. 
 
HV cableing was installed for the NE.  We will try to hookup the CMX spare(s) once we locate its position in the counting room.  Once this is done the east side will be setup as it will be for post-shutdown/running.  The new HV cables for the NW are partially installed. 
 
We found out that there was an abstance of 7 ASD boards needed for the miniskirts.  (It appears that 3 boards were missing from the NE as well as the NW and this was not caught durning the last shutdown.)  2 boards (563286 and 563282) were inserted (as they were both ok) into the NW.  Thus there are 5 remaining vacancies (1 for the NW, 3 for the NE, 1 for the SW).  We are quickly testing and hopeing to fix several 'almost ok' boards. 
 
Major HV work to start tommarow.  Signals (assuming we have ASDs) will be tested next. 
</pre>
<!-- Author: John Strologas, Jason Jarrell, Ingyin Zaw, George Ott, Dale Stentz -->
<!-- Comment: Thu Sep 25 11;32;15 comment by...muge -->
the thing about the MS asd's are pretty surprising. are you sure you have not taken out any during/before the last shutdown? my recollection tells me when we last checked with Abraham, we only left out the 10 degree sections, but left the miniskirt asds in (although not pushed in totally in the crate), keeping them "sure-spares" in the pit (and even their thresholds were adjusted at least 2 times)... And this is exactly what i see in the one of the entries by Phil from jaunary
<b>"The empty ASD 
slot for wedge SE 15 is where one would expect it. We didn't find the 
signal cable. There are a number of ASDs in the NE and west crates that 
aren't cabled to anything, look like they could easily be removed and are 
thus potential spares. We should consider taking them out."</b> (SE 15 is the 10 degree which we did not expect to have at all)
and i also see that <b>" We removed 2 ASDs from the NE crate that were easy
to get more potential spares."</b> So, what you may may have upstairs may be already good spares to start with! Please check with Phil and Dale which cards are these and how many more asds are taken out during last shutdown. 


<!-- Date: Sun Sep 28 15:47:43 2003 -->
<table><tr><td><a href=/elog/notebooks/cmx/Sun_Sep_28_2003_154719.ps align=top><img src=/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-162  align='top'></td><td>CMX 2D Occupancy plot with 1639 events.  Notice that wedge 21 on the NW is lit up like a christmas tree.  The hits in wedge 18 and 19 are from the miniskirts.  We expect more but given the low number of statstics this is basically a good sign of progress.  Long cosmic runs will be ask for next week for sure.</a></td></tr></table>
<!-- Author: Dale Stentz -->
<!-- Comment: Sun Sep 28 15;53;05 comment by...Dale Stentz -->
<a href=
'/cgi/elog/elog.pl?nb=2003&action=view&page=809&frame=2&anchor=08:33:39.649'>
This appears to be related to the problem that Muge spoted in the shift e-log. </a>   This will be investigated further.  (Any ideas why the plot came in sideways?)


<!-- Date: Sun Sep 28 17:08:49 2003 -->
<pre>Update on CMX work durning access: 
 
Once we got AE gas we were able to move foward and get the NW up to the point that we could start looking at signals etc.  First we got the low voltage (LV) and signal cables connected.  At first the HV turned on smothly but eventally the NW had some quick/rampup trips.  We investiagated and saw that the middle 5 degrees of wedge 19 sparked (and triped everything) on rampup.  We made some improvments: kapton tape on anode wire joints, rearrange/orgainize wires, etc.  This seem to solve the problem and we haven't had any trips on the NW since.   
 
The NE seems to be having no HV troubles.  Currently we have wedge 19 being controled upstairs at MUON3 (the HV muon control computer in the counting room) as in the case for the NW.  Wedge 18 of the NE is being controled with a drogie in B0 as the DRIFT 01 channel is bad.  We talked to Dervin and we will search out the spare cable #110887 for the NE and cut/and make new connections for the bad cable #106637.   
 
Recall that the NE does not have pre-amp boards installed yet so this will be one of the first things done on Tuesday.  (Note that there are no problems running without the signal wires connected.) 
 
We ran up and looked at the signals coming from the NW and the results were ok but not great.  More to the point, there were 5+16 additional bad channels (more than the number of ones that are by-passed).  Note that a group of 16 (the first 5 degrees of wedge 19) was bad.  This was not a HV problem so the ASD board seems to be the trouble maker.  One signal seem to have have not inverted half of the signal corrently.  The others were flat out dead - possible radika problem.  We will start check Tuesday. 
 
Sample signals to come soon.  In addition, we will keep tabs on the data that comes from long cosmic runs, etc. 
 
Currently the HV is holding on the NW and NE.  Dirft current values are 
 
NW: 
I_19 = .401 mA 
I_18 = .332 mA 
 
NE: 
I_19 = .417 mA and I_19 ~= I_18 when last looked at. 
 
The HV (except for the drogie in B0) will be turned off when we leave today to avoid any possible problems.</pre>
<!-- Author: John Strologas, Jason Jarrell, Ingyin Zaw, George Ott, Dale Stentz -->


<!-- Date: Sun Sep 28 17:18:35 2003 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-163&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-163' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-164&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-164' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-165&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-165' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-166&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=cmx&action=view&page=-166' width='300'></a></center>
<!-- Author: Dale Stentz -->
<!-- Comment: Sun Sep 28 17;20;55 comment by...Dale -->
<pre>I'll try this again.  It should have worked.</pre>