<!-- Title: 12:07:33  Fri Nov 18 2005 -->
<!-- Crewchief: Woo-Hyun Chung -->
<!-- Op1: Dan Cyr -->
<!-- Op2: Shan-Huei Chuang -->
<!-- Op3: Yeong-Dae Shon -->
<!-- Op4: Jim Bellinger -->
<!-- Op5: Bob Handler -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
IMU e-log: Record Everything About BMU Chambers (BSU & TSU too) from now on.


<!-- Date: Mon Dec 5 12:59:11 2005 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-2&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-2  width='300' align='top'></a></td><td>This is the reference YMon occupancy (West) plot for access work.</td></tr></table>
<!-- Author: Woo-Hyun -->


<!-- Date: Mon Dec 5 13:00:29 2005 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-2&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-2' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-1&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-1' width='300'></a></center>
<!-- Author: Woo-Hyun -->


<!-- Date: Mon Dec 5 14:36:00 2005 -->
<pre> 
BMU ACCESS REPORT :  Accesses were made on Nov.22, 28 and 29  
                     and two YMon plots (run 207513) above  
                     were used as references.  
 
Single Dead Channels--------------------------------------------- 
  
  West: NW263(0,1) : Suspected that half of preamp pin were  
                  not inserted. 
                  Turns out that was a correct guess!  
                  -- Fixed it. 
    
        NW52(0) : Good looking signal before TDC input. 
                  That means there is a problem in TDC or  
                  paddle card.  
                  Could try TDC and/or paddle card swap. 
  
  East:~SE96(1) : Good looking signal before TDC input. 
       ~SE89(3) : Good looking signal before TDC input. 
       ~NE64(3) : Good looking signal before TDC input. 
  
       SE118(2) : Very weak signal 
                  Swapping preamp didn’t cure the problem. 
                  Second replacement of preamp made signal  
                  look better. 
                  The preamp socket on HV board might be 
                  partially blocked. 
   
Noisy Channels (HV)---------------------------------------------- 
  
  West:NW24 - NW29 : Signals look a lot worse at paddle card 
                  input than in occupancy plots in YMon. 
                  NW26-27 pair looked worst, and when  
                  examined with Droegie pair by pair,  
                  it was obvious that one of  26-27 pair was 
                  the culprit. 
                  Take Xend jumper out and isolate NW26. 
                  HV board on NW26 was replaced. 
                  Happy looking signals now! 
  
       ~NW54 :    Tiny bump in YMon plot, but nothing  
                  unusual on scope. 
  
  East:SE150 - SE155 : Same signal pattern as in NW24-29. 
                  Using Droegie to identify 150-151 pair as bad. 
                  Take Xend jumper out and isolate SE151. 
                  HV board on SE151 was replaced. 
                  Happy looking signals now! 
  
      ~SE140 :    Tiny bump in YMon plot, but nothing  
                  unusual on scope. 
      ~NE70  :    Tiny bump in YMon plot, but nothing  
                  unusual on scope. 
  
Tripping HV Sectors---------------------------------------------- 
  
  East:NE60-61 :  This pair was taken out of chain by Dan and  
                  Phil (Nov. 9th). 
                  Droegie test showed nothing wrong with the                            
                  pair. 
                  Put them back to the HV chain, it is holding 
                  without tripping. 
  
       NE12 :     This sector used to trip many times before,  
                  but has been unable to trip reliably recently. 
                  Droegie test didn't show anything unusual. 
                  Now this HV sector is divided into three groups 
                  of stacks (4 each) and fed by three different  
                  HV channels (NE0, NE12 and NE24).</pre>
<!-- Author: Woo-Hyun, Sunny and Yeongdae -->


<!-- Date: Tue Jun 27 17:43:08 2006 -->
Access work for BMU: We verified oscillations at NW54-59 before we go in for controlled access. We swapped the radeka preamps (all 4) on stack NW55 with modified ones (from Dale).  Much trouble raising HV on several locations (4 different channels), but we were able to put them on standby by reducing ramping speed (35 to 10 V/s for cathode, 50 to 15 V/s for Anode). We checked signals on scope from NW54-59 to make sure oscillation were gone.
<!-- Author: Woo-Hyun & Yeongdae -->


<!-- Date: Wed Jun 28 14:32:26 2006 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-3&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-3' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-4&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-4' width='300'></a></center>
<!-- Author: Woo-Hyun -->


<!-- Date: Thu Jul 27 04:29:58 2006 -->
Access Report for BMU: Oscillation was in NW54-57. We were suspicious about the iron source monitoring cables hanging in front of ASD crate, but removing those twisted pair cables didn't help. Oscillations disappeared when we cycled LV power on NW54. Last time, modified preamps were placed on NW55. Looks like the culprit for the oscillation on this spot is NW54, not NW55. We will make more modified radekas and change out those on NW54 next time.  - Woo-Hyun & Yeongdae 
  
<!-- Author: Woo-Hyun & Yeongdae -->


<!-- Date: Tue Nov 14 20:06:23 2006 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-7&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-7  width='300' align='top'></a></td><td>West side shows no sign of stress unlike the east side.</td></tr></table>
<!-- Author: Woo-Hyun -->


<!-- Date: Tue Nov 14 20:08:33 2006 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-8&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-8  width='300' align='top'></a></td><td>Showing problems in the east side. This happens after a long (week) access when BMU wasn't supposed to be touched.</td></tr></table>
<!-- Author: Woo-Hyun -->


<!-- Date: Tue Nov 14 20:16:18 2006 -->
<pre>Summary of problem channels: 
SE100 --&gt; almost dead 
SE102,SE103 --&gt; doesn't look like HV board problem 
                much busier than normal 
                signals seem overlapping ~150ns 
                only shows up in outer channels (0 and 3) 
SE124,SE125 --&gt; same as SE102,SE103 
SE97(1),SE167(2),SE90(3),NE65(3) --&gt; show up dead in occ. plot 
                                     but alive before paddle card 
</pre>
<!-- Author: Woo-Hyun -->


<!-- Date: Thu Nov 16 16:49:27 2006 -->
<pre>I have checked BMU noisy channels (SE102,103 and SE118,119) again to make sure they are not HV related problems.  With HV turned off, those channels show small oscillations (~100ns) and LV power cycling didn't work. We have to request a short access (~1hr) to swap preamps and if it doesn't fix the problem, we have to request a longer access (&gt;4hrs) with toroid pushed back to make a room to access Xend jumpers. </pre>
<!-- Author: Woo-Hyun -->


<!-- Date: Mon Dec 18 13:08:09 2006 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-10&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-10' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-11&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-11' width='300'></a></center>
<!-- Author: Woo-Hyun -->


<!-- Date: Mon Dec 18 13:28:54 2006 -->
<pre>Last Wed.(Dec. 13th) Varsha and I made an access to fix problems: 
 
      East side: SE102-103 and SE118-119 
                 Both show the same sort of problems, they only        
                 show up on ch0 and ch3 (ch1-2 show nothing). 
                 We couldn't see anything wrong with signal  
                 directly from preamps and ASD's analogue out, 
                 but ASD's output showed clear oscillations. 
                 We decided that ASD boards are responsible and  
                 swapped both of them, but the problems continue 
                 to be there. 
                 Our second guess is that there might be a  
                 problem in Xend jumpers. We decided to request  
                 an access with toroids open. 
 
      West side: NW40-41 
                 I wasn't able to identify the problem before on  
                 these channels before, but now it is clear that  
                 the culprit is HV board. We are running out of  
                 time in this access and don't know which one is  
                 responsible unless Xend jumper removed.  
                 We decided to wait until next access (toroids  
                 should be open) 
     </pre>
<!-- Author: Woo-Hyun -->


<!-- Date: Thu Jan 25 12:02:02 2007 -->
<pre>BMU Controlled Access Report:  
 
  East side: SE102-103 & SE118-119  
             Noisy (looks like overlapping or retriggering)  
             Removed Xend jumpers fixed the problems  
  West side: NW40-41  
             HV board problem  
             Had to remove Xend jumper to isolate --&gt; NW40!  
             HV board was replaced and that fixed the problem  
 
  it will be verified using Cosmic run before access is over 
 
</pre>
<!-- Author: Woo-Hyun & Varsha -->


<!-- Date: Thu Jan 25 18:01:09 2007 -->
<pre>BMU SE108 HV sector has been tripping ~2 hours after we fixed noisy channels at SE118-119, which belong to this sector. We earlier guessed that the feeding cable might have problems, but during the second access we concluded that the pair SE108-109 was the culprit. Excluding the pair from the HV chain did cure the tripping problem, but we didn't have time to investigate further. Considering that it trips less than 1k volts of anode voltage, there might be a disconnection on HV line or broken wire inside. It should be investigated more in a longer access. </pre>
<!-- Author: Woo-Hyun & Varsha & Yeongdae -->


<!-- Date: Thu Feb 1 13:45:01 2007 -->
<pre>BMU Access Report:  
  East side: SE108-109 HV problem (tripping around 1k volts) was                
             fixed by removing Xend jumer cables.  
  West side: NW44 layer2 channel was dead -- fixed by replacing  
             preamp.</pre>
<!-- Author: Woo-Hyun & Yeongdae & Varsha -->


<!-- Date: Mon Feb 5 11:52:47 2007 -->
<center><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-14&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-14' width='300'></a><a href='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-15&button=yes' target='xxx' onclick='jswindow()'><img src='/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-15' width='300'></a></center>
<!-- Author: Woo-Hyun -->


<!-- Date: Fri Mar 9 11:20:09 2007 -->
 Thu Mar 1 11:14:57  
Trigger Inhibit is set from the components:  
 BMU HV West Trip  	[084] Intermediate Muon Trip 00  
 
NW ch. 276 tripped, recovered ok 
 - Jim :: (run 235389) 
<!-- Author: Woo-Hyun -->


<!-- Date: Fri Mar 9 11:21:19 2007 -->
 Thu Mar 1 15:35:54 Run 235389 monitors: XMon not necessarily OK - two_trk2, cem & bmu+jet trigger behaviors are distinguishably different from previous stores! will post the plots.  - Consumer Operator( Shan-Huei Chuang) 
-- Thu Mar 1 16:29:42 comment by...Emily --  In the new table the L2_PS50_L1_TWO_TRK2 and L2_TWO_TRK2_D100 triggers are now feeding off L1_TWO_TRK2_PS4k and they were feeding off L1_TWO_TRK2_PS20k in the previous table which may explain the increase in rate of these triggers.  
-- Thu Mar 1 16:36:28 comment by...Emily --  The MUON_CENTRAL_JET20_L1_BMU10_BSUR path now has the L1_MB_CLC specific option removed from its L1 trigger which is probably why we see an increas in rate in this trigger. 
<!-- Author: Woo-Hyun -->


<!-- Date: Wed Mar 5 12:25:57 2008 -->
<pre>Copy of entry in CDF e-log for work during Supervised Access 
for BMU East stacks 152 and 153 (Mar. 4th 2008) : 
 
Tue Mar 4 15:57:44 
 
BMU ACCESS REPORT:  
We removed the Xend jumpers for 152-153 .152-153 has been reconnected. 
 
 - varsha :: (run 259003) 
-- Tue Mar 4 17:32:13 comment by...Yeongdae --   
 
Currently this part of BMU system is under testing stage. Because of this work, BMU East Sector 
144 was only connected to stack number 152-155. So, if the BMU EAST 144 sector is tripping 
unusually, put this sector to Satndby or OFF. BMU data is OK to mark good, since the potentially 
problematic part is very little. Then contact BMU personel immediatly. Currently BMU pager is out of 
town and may be out of reach. Thus in case BMU pager does not respond, please call 
Vasha(608-469-0335), Woohyun(608-770-0736), or Yeongdae(630-225-7031, 630-666-8758). I will bring 
the BMU pager onsite on Thursday. 
 
</pre>
<!-- Author: Woo-Hyun -->


<!-- Date: Fri Jun 13 23:56:23 2008 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-18&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=imu&action=view&page=-19  width='300' align='top'></a></td><td>Links: <a href= 
'/cgi/elog/elog.pl?nb=2008&action=view&page=494&frame=2&anchor=12:42:22.188'>BMU west 168 trip off</a> and <a href= 
'/cgi/elog/elog.pl?nb=2008&action=view&page=495&frame=2&anchor=17:13:30.586'>Phil's observations</a><br><br> 
I've quantified the behavior that Phil saw via the CDF SlowControl.  The data aren't a fine as one would like but it does suggest something is up around west 168.  Channel #15 corresponds to the tripping sense HV while #16 is at the mirror position on the NW (both channels are "at the bottom").</td></tr></table>
<!-- Author: Dale Stentz -->


<!-- Date: Mon Jul 21 16:32:35 2008 -->
<pre>BMU access report:   
 
We were trying to fix HV noise problem on NW54-55 and oscillation problem on NW55. As soon as the 
access started the oscillation on NW55 went away (we have seen this before many times). Our initial 
guess on HV noise on NW54-55 was the HV board trouble in either one of 54 or 55, but when we 
disconnected Xend jumper in order to identify which one is responsible, the noise disappeared. The 
problem might have been in the Xend. HV sector NW48 which contains NW54-55 was restored to normal 
configuration.   
 
We also swapped three preamps to fix single dead channels on NW127, SE100 and SE116. One dead 
channel on NW127 was fixed, but SE100 and 116 stayed the same. Those channels are not completely 
dead, but show very small signals (both look the same). This might be caused by blocked socket for 
preamp pins on HV boards.  
 
</pre>
<!-- Author: Woo-Hyun & Yeongdae & Varsha  -->