<!-- Title: 08:24:33  Mon Jul 26 2004 -->
<!-- Crewchief: RR+CB -->
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<pre>Status -- Week of July 26th</pre>


<!-- Date: Mon Jul 26 08:28:11 2004 -->
<pre>Monday Morning 
 
We continue to run well -- We have been on one run since the start of this store.  We have taken &gt;3pb-1 for this store at &gt;90% efficiency.  D0 has requested a 2 hour access.  We will go in to look at miniskirt HV issues as well as make some radiation monitoring measurements.    
 
At the end of this store, MCR will perform a study in which they separate the beams and measure beam gas collisions.  We will turn our HV to standby except for the CLC.  This is to answer the question of how good the vacuum is at B0.  (we measure it 30' away!) 
 
Store termination has not been set yet -- most likely early afternoon.</pre>
<!-- Author: RR -->


<!-- Date: Tue Jul 27 10:28:34 2004 -->
<pre>Tuesday Morning 
 
 
Shot went in yesturday evening at 77e30.  How jaded we are now...  It should have been better but there was an RF trip during scraping -- beam blew up and so we lost 10% of our initial lum.  Losses were well behaved.  We tried to turn on right away.  We had trouble with CES HV on the NE arch.  These 6 wedges kept tripping.  Ultimately we were able to bring it up to within 50V of nominal and left it.  This should not have a big impact on data efficiency.  (full voltage is about 1400 I believe).  We have been taking data smoothly all night.   For the store we are at 87% efficiency at hte moment -- mostly because we lost the first half hour due to this problem. 
 
Plan is to end the store on evening shift.  They will do a second lum study where beams are separated and the vacuum is varied at B0 and we observe the impact on luminosity. 
 
D-zero is having power supply woes.  They swapped two yesturday because of trips.  The new supplies lasted a few hours and are now tripping.  D0 has been taking data all store with a screwed up calorimater.  They will probably request an access but as of 9am they were not sure what they would do once inside. 
 
We are running well with no access issues. 
</pre>
<!-- Author: RR -->


<!-- Date: Wed Jul 28 08:23:32 2004 -->
<pre>Wednesday Morning 
 
Yesturday's data taking went very smoothly.  We took some time out at the end of the store to remove silicon and swap one of the two SRC's while we had experts around to insure we had a working spare.  While that was in progress, we ran a special trigger table (single track) for jet energy calibration.  There was an access available last night because of D0.  We did not make use of it. 
 
Next store went in at midnight.  Monica et al turned on right away.  By the end of their shift, they set a record of 1.5pb to tape with the entire detector integrated and an efficiency of 90%!  Excellent job!!!  (Thanks to all the silicon guys for being there just in case....) 
 
Injector complex is currently in on access.  there is 50ma in the recycler.  I assume the next shot will be mixed mode since they had to dump the remaining pbars in the accumulator. 
 
</pre>
<!-- Author: rr -->


<!-- Date: Wed Jul 28 21:13:33 2004 -->
<pre>Wednesday Evening 
 
We continue to take good data with &gt;90% efficiency.  Stacking started late so store will not be dropped till mid day tomorrow.  D0 has muon power supply problems -- will get a 1-2 hour access between stores.  CDF will likely use this to go in and move bonner spheres and perhaps some silicon l00 crow bar work. 
 
</pre>
<!-- Author: RR -->


<!-- Date: Thu Jul 29 17:03:54 2004 -->
<pre>Thursday Afternoon 
 
Ran reasonably well overnight.  Did have an event builder problem that required 1.5 hours and an expert to come in to solve.  Spent the end of store doing a l00 bias scan.  Ended the store at  86% efficiency.  We made use of the access to move bonner spheres for the final time.  We also fixed a l00 crowbar fuse as well. 
 
Shot setup is on hold due to a quench.  Proton only store first to check out a swapped sextapole magnet and then shot setup.  Current stack is about 155ma. 
</pre>
<!-- Author: rr -->


<!-- Date: Sat Jul 31 09:54:00 2004 -->
<pre>Saturday Status 
 
Friday's store ended with a quench of b0q6.  Several quenches without beam ensued as they trouble shot the problem.  The short answer was this magnet's power supply had problems with its regulation circuit.   
 
A new shot was put in on the Saturday Owl  shift early on.  Initial lum was 86e30.  We ran relatively smoothly on the owl shift and ended up with an 82% efficiency for that shift -- which is not bad for a shift which contains shot setup...  The glaring problem was CES HV trips.  These are now happening relatively frequently.  This one was in NE18-23.  Sometimes they reset promptly, other times, it takes a while.  Not obvious whether it is beam related or not.  We don't have loss monitors for that solid angle. 
 
Kirsten ran a new trigger table test with beam.  This table contains the new uber and fractional prescales.  It failed with beam.  It looks like there is a problem with the bit optimization code.  To be continued.... 
 
Luminosity is currently at 35e30 with a stack of 107.  No plan at the moment but most likely they will leave this shot in until middle to late owl shift Sunday. 
 
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<!-- Author: RR -->


<!-- Date: Sun Aug 1 08:35:56 2004 -->
<pre>Sunday 
 
TeV quench yesturday -- CDF did not take any damage to its detector.  Problem is there is a ground fault on the A side CDF low beta's.  1kohm.  Investigations are just beginning.  Worse case scenario is we have to pull out the Q4 and replace it.  Best case probably means we are still down for a week.  Shutdown may start today....  We will see. 
 
There is a 9:00 planning  meeting to discuss the plan.  We will see how it goes.  Stay tuned for details.  </pre>
<!-- Author: RR -->


<!-- Date: Sun Aug 1 13:58:12 2004 -->
<pre>From Run coordinator elog -- it says it all.... 
 
There was a meeting this morning to discuss the ground fault on or near B0Q3 on the A4 side. There is one failure scenario that would be an "easy" fix, a voltage tap on the Q3 magnet. This would "only" take 36-48 hours to repair. However, if there is a bad magnet, repairs would take 5-6 weeks. The long shutdown is schedule to begin in 3 weeks. To identify the scope of the problem, shielding steel in the CDF collision hall will be removed and will take several hours. We hope to have a good idea about the what is broken tonight or tomorrow and make plans. - JPM </pre>
<!-- Author: rr -->
<!-- Comment: Sun Aug  1 13;59;19 comment by...rr -->
<pre>We have taken all the shielding steel off to look at q2/q3 interface and q3/q4 interface.  There is a huge iceball at q2/q3 AND the voltage taps are covered in ice.  I am praying the ground fault is right there....</pre>

<!-- Comment: Sun Aug  1 15;32;04 comment by...rr -->
<pre>Looks like ground fault is fixed -- ice ball on voltage taps.  There is suppose to be a cover to protect the taps from seeing moisture.  That was missing...  High pot remains -- as does a repair of the kautsky valve.

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