<!-- Title: 03:52:05  Mon Jul 17 2006 -->
<!-- Crewchief: Willis+Peter -->
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<pre>Week of 17 July 2006</pre>


<!-- Date: Tue Jul 18 10:13:49 2006 -->
<p>Monday July 17 Store 4838 started at 0445 hrs, with an initial luminosity of 79.4e30. The initial luminosity was low due to problems stacking over the weekend.  No significant problems with beam or detector startup.  Abort gap looses look fine so the problems on the previous store do seem to be isolated.  After 29 hours data taking efficiency is at 90.1%.  </p> 
 
<p>One ISL ladder has been turned off due to a hot cooling line.  This is one which had been cleared of epoxy but a prism was lost inside the line and not retieved.  An attempt will be made to burp the line and clear the blockage.</p> 
 
<p>Accelerator has had a number of problems with accumulating a big stash over the past 24 hours.  Pbar production has been lower than last week and transfer efficiencies lower.  Only two shots from pbar to RR.  Stash was lost about 14:00 Monday due to a vacuum burst in a transfer line.  </p> 
 
<p>Plan to keep store for HEP until 11:00, then 3 hours TeV studies followed by shot setup. </p> 
 
 
<!-- Author: Peter and Willis -->


<!-- Date: Wed Jul 19 20:15:44 2006 -->
<p>Tuesday, 18 July 2006: Store 4838 is terminated normally at 1425 hrs. 
   We recorded 
   2.9 pb-1 at 87% efficiency. This was followed by TeV studies. Store 
   4839 starts at 1823 hrs, with an initial luminosity of 
   106e30. Tev T:RF3 went down during the squeeze. 
    We start running right away, but about 0.5 hrs into the store, 
   we get stopped in our tracks for 0.5 hrs when a bunch of front 
   end crates simultaneously stop responding. It is not clear why -- 
   there are no problems detected in the network switches. That cleared 
   itself, and we ran without problems until 2350 hrs, when we turned off 
   for about 0.7 hrs when the TeV abort gap current, AGIGI2 went above 
   5e9, and had to be cleaned out by the MCR. 
</p> 
<p>Wednesday, 19 July 2006: Store 4839 continues. No major problems until 
   1442 hrs when we went down for 0.75 hrs due to forward muon TSU CCU 
   problems. 
   The store was aborted at 1548 hrs, when the 2nd RF station, T:RF2, went 
   down. No signficant beam losses were observed. 
   We recorded 2.8 pb-1 at 84% efficiency. 
   D0 went in on controlled access when the opportunity arose because of 
   accelerator down time due to TeV RF work. 
   We went in a bit later at 
   1753 hrs, and we came out at about 1848 hrs. We went in to try to fix 
   the the TSU problem, but we were <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=506&frame=2&anchor=19:28:40.299'> 
   not successful.</a> An attempt was also made to fix a NW lower CMX HV 
   problem, but there was not enough time. 
</p>  
<!-- Author: Willis+Peter -->


<!-- Date: Thu Jul 20 17:38:53 2006 -->
<p>Store 4841 starts at 2322 hrs, 19Jul06, with an initial luminosity of 
   131e30. We start running quickly and do have any big down times. 
   However, Store 4841 is lost at 0424 hrs when the TeV ramp dies when 
   a the TeV CAMAC crate at F2 dies. The abort was clean and there were 
   no significant beam losses. We recorded 1.4 pb-1 at 86% efficiency. 
   Since the NW IMU muon quadrant is bad due to the TSU CCU problem that 
   could not be fixed yesterday, we asked for and got  a 1.5 hr access 
   at the end of the next store. 
</p> 
<p>Some news from the July 2006 RunII PMG meeting: There was first mention 
   of the 2007 shutdown: Jun-Jul 2007 -- but it was also mentionted that 
   this was still quite iffy. It was also mentioned that the Accumulator 
   needed 2 shifts of down time for work, and the plan was to wait for 
   the D0 2 shift access for the A-layer muon readout work. On the other 
   hand, D0 is waiting for an accelerator down time for this ... 
</p> 
<p>Store 4845 starts at 1332 hrs, with an initial luminosity of 107e30. 
   We start running right away and are happily taking data. At 1735 hrs, 
   we have recorded 1.0 pb-1 at 90% efficiency. </p>  
<!-- Author: Willis+Peter -->


<!-- Date: Fri Jul 21 16:45:33 2006 -->
<p>Store 4845 continued through the morning, and was terminated normally 
   at 1410 hrs. We recorded 3.5 pb-1 at 92% efficiency, with silicon. 
   We went in on controlled access from 1428-1549 hrs. The TSU CCU problem 
   that made the NW BMU quadrant bad was fixed. The west CMX wedge 21 HV 
   distribution was reconfigured to mitigate the recent HV trips. Details 
   of the muon work are <a href= 
'/cgi/elog/elog.pl?nb=2006&action=view&page=511&frame=2&anchor=15:21:24.591'> 
   here.</a> The silicon group also went in and investigated the bit errors 
   from e4a3 (SB4W10L3), and found that the errors are due to an internal 
   ladder problem. This access, which we requested, was successful, and 
   we were out before D0. The next store should be a good one: The 
   Recycler has 278e10 pbars (160e30 initial luminosity projection). 
</p>  
<!-- Author: Willis+Peter -->
<!-- Comment: Fri Jul 21 20;16;33 comment by...Willis+Peter -->
<p>Store 4847 starts at 1856 hrs, with an initial luminosity of
   158e30. We start running right away without any problems.
   About an hour into this store, the data taking efficiency
   is 82%: readout dead time is about 3-4%, but pause/halt 
   is at 8.1%...
</p>


<!-- Date: Sun Jul 23 23:14:25 2006 -->
<p> 
Store 4847 started 7/21 at 18:50 with initial Lum of 156E30, the 2nd best since the shutdown.  Stayed in for 33 hours and termated normally with delivered Lum of 6.7pb-1.  Efficiency of 83.5% (75.8% with silicon).   
 
The Silicon resonances which had not been seen for a week returned during this store.  For some period of time Si was excluded to investigate.  Learned that during the resonace bursts FRED_L1A is running at the same rate as L1_CJET5 and L1_JET5 primitives.  Investigation continued in store 4851.  The silicon is protected by the resonance detection of the GB but we need to find the source of these bursts. 
 
</p>  
 
 
<p> 
With the store staying in and good stacking/stashing performance over the weekend a good size stash was available on Sunday mornig for store 4851. 
</p> 
 
<p> 
Store 4851 in at 8:29 on 7/23 with initial luminosity of 179.5 the 2nd highest on record.  Day shift had highest integrated luminosity for a shift (3.2pb-1).  After 14 hours efficiency is 85.8%.   Problem with IP of SVT in run 222027 that was corrected by ending the run and restarting.  This is not understood.     
</p> 
   
<!-- Author: Peter and Willis -->