<!-- Title: 08:36:28  Mon Mar 31 2008 -->
<!-- Crewchief: Phill -->
<!-- Op1: Sebastian -->
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<!-- Notes: -->
<pre>Week of Mar 31st</pre>


<!-- Date: Mon Mar 31 08:38:05 2008 -->
After some good running last week, this one starts with MI recovering from vacuum problems.  
<!-- Author: Sebastian -->


<!-- Date: Mon Mar 31 10:17:58 2008 -->
NuMI QD111 magnet is having problems. If it needs to be swapped it could mean about 2 days down. Also MI vacuum problems better but not clear if solved yet. Hopefully things will be clearer later today.
<!-- Author: Phil & Sebastian -->


<!-- Date: Mon Mar 31 13:53:33 2008 -->
From RunCo: 
<pre> 
2:15:59-   We will try to run beam to NuMI possibly after lunch. We will run at low intensity. If it is determined we can not run normal beam to NuMI we will look to a magnet change some time in the next 48hrs. We will try to get a Collider shot in the Tevatron before we turn off MI. The NuMI quad change could take up to 2.5days due to the the nature of the installation. MI vacuum is looking better.</pre>  
<!-- Author: Sebastian -->
<!-- Comment: Mon Mar 31 15;54;30 comment by...Sebastian -->
The plan is to have try to have a store by 7AM tomorrow and then start working on the NuMI magent. If the magent needs to be swapped, it will mean 2.5 days of down time for MI, but a store will be spinning for the first half of this time (hopefully). The Li lens will be swapped if the long down time is needed; also we could probably go into access to work on:
<ul>
<li> Rearrange cot TDCs
<li> Swap the fan pack still on the list
<li> BMU work
<li> Repair SW relay rack drive
</ul>



<!-- Comment: Tue Apr  1 13;45;42 comment by...Sebastian -->
It might be a good opportunity to fix the plug sources. Nikolay and Alex are already aware of this.
<!-- Comment: Fri Apr  4 15;24;17 comment by...Sebastian -->
Talked to Nikolay, he pointed out that to do the top source (on the west side) he might need another person to help out. Also a kind of table to prevent loosing small tools will be useful (to put below the driver while doing the work). 
<!-- Date: Tue Apr 1 07:33:10 2008 -->
<pre>Store 6020 just started colliding. There will be access to MI to look at the numi quad in the MI tunnel.</pre>
<!-- Author: Phil -->


<!-- Date: Tue Apr 1 07:46:10 2008 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=operations&action=view&page=-102&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=operations&action=view&page=-102  width='300' align='top'></a></td><td>I've updated my beam line parameter plot through 6013. A few remarks: 
 
- The vertical slope has wandered back in the right direction 
- The horizontal slope is around the limit for describing it as big 
- The thing that I hadn't noticed before was that the vertical position took a one time 0.5 mm downward hop during the down time of the first week of March - while I was on furlough! It has slowly moved back up a bit. 0.1 is also at the limit for "good". 
</td></tr></table>
<!-- Author: Phil -->


<!-- Date: Tue Apr 1 09:46:45 2008 -->
NuMI magnet will have to be replaced. The replacement work is likely to be done tomorrow morning after a new store is put in. Not clear at this moment if we will have an access opportunity.
<!-- Author: Phil & Sebastian -->
<!-- Comment: Tue Apr  1 10;44;41 comment by...Phil -->
<pre>from the mcr elog:

10:17:49-   It is official:

    * There will be a multi-shift access into the MI Wednesday morning to replace the NuMI beam line magnet QD111. Other work requests are being processed by the RunCo.
    * Experts are now assessing the physical conditions and demands of the magnet replacement. We hope to resume stacking in the early afternoon today.
    * Exact details will follow later today in the RunCo E-Log.

 - marty</pre>

<!-- Comment: Tue Apr  1 13;19;03 comment by...Phil -->
<pre>The present estimate for the replacement is 30 hours (down from the 2-2.5 days I've heard). The job hasn't been done before though. The re is the possibility that a higher gradient lithium lens will be swapped in in pbar. You can find more discussion in the run co elog.</pre>



<!-- Date: Wed Apr 2 06:53:07 2008 -->
Store 6020 was terminated at 3:40am (we run well at 85%), now we have 6021 colliding with initL=207E30. MI is prepared for access to replace the NuMI magnet.
<!-- Author: Sebastian -->


<!-- Date: Wed Apr 2 10:04:54 2008 -->
Notes from the 9AM meeting: plan unchanged, work on the NuMI quad replacement underway. Steel lens will be replaced with the better titanium one (10mm#2), plan to pulse the lens befor ethe end of the day to check it out.
<!-- Author: Sebastian -->


<!-- Date: Wed Apr 2 22:09:57 2008 -->
<pre>Estimate for finishing the numi magnet swap is noon tomorrow.</pre>
<!-- Author: Phil -->
<!-- Comment: Wed Apr  2 22;14;47 comment by...phil -->
<pre>looks like we'll be at 40e30 26 hours into the store which would be about 6 or 7</pre>


<!-- Date: Thu Apr 3 07:52:50 2008 -->
<pre>Those estimates are still ok. There is a wet engine that may need work between stores, otherwise, it would look like an owl shift shot is possible.</pre>
<!-- Author: Phil -->


<!-- Date: Thu Apr 3 09:49:32 2008 -->
Notes from the 9AM meeting: 
<ul> 
<li>D0 needs 1.5hr access (for muon system), which will fit well 
for our 2hrs needed for COT diagnostic 
<li>pbars are looking well after the lens change, hopefully this will mean even better stacking rates 
<li>NuMI work is going well and expect to be done by noon today 
<li>Booster, MI and RR work also going well 
<li> TeV: wet engine work is needed, kicker is back 
</ul>
<!-- Author: Phil & Sebastian -->


<!-- Date: Thu Apr 3 12:26:50 2008 -->
Shutdown plans so far (likely to change): 
<pre> 
- Likely to have a ~1week shutdown sometime this summer (for machine maintance: heat 
  exchangers. zebra mussels, SF6 switch, other). In case of failure (eg, magnet down) 
  then that might be the chance to do it. 
- The April 09 long shutdown is driven by Nova tunnel work in the MI, estimated 10 weeks. 
  Next come 9 weeks of Booster work to install 36 correctors (not clear to me if TeV 
  program will benefit from this), then other MI work (re-hosing) with 7.5 weeks. 
</pre>
<!-- Author: Sebastian -->


<!-- Date: Thu Apr 3 13:37:10 2008 -->
Store will be terminated at 8:30PM, D0 will go into access. We will have 2hrs to do the COT work before the next (proton-only) store comes in (TeV studies will be done through the night). Stacking will resume hopefully around 6PM today and the next collisions store would be tomorrow morning.
<!-- Author: Sebastian -->
<!-- Comment: Thu Apr  3 22;03;21 comment by...Sebastian -->
We stopped taking data at 19:30 because of TeV EOS studies. Stacking resumed about 18:00. Looks like next shot will be in the day shift. Phil brought back cake from the party.  


<!-- Date: Fri Apr 4 10:22:20 2008 -->
<pre>D0 accessed all night. Experts are sleeping and will need another go around. The plan was to turn on Tev and put a store in as soon as the stash was in the 120-150e10 range. We are at 100 with 32 in the accumulator. But the booster septum has been giving trouble this morning and has tripped off again. Hmm...</pre>
<!-- Author: Phil & Sebastian -->



<!-- Date: Fri Apr 4 15:26:24 2008 -->
Store 6023 just came in at 123E30. Had a COT trip in the very begining because the luminosity being readout by the COT was 0 (the current trip limit is adjusted depending on the lum), but Aseet and Bob were there already.
<!-- Author: Sebastian -->
<!-- Comment: Fri Apr  4 15;36;38 comment by...Sebastian -->
The problematic Booster magnet needs more investigation. If it turns out that it needs to be swapped, the earliest possible time is Saturday noon. Not clear yet if another store would be put in before this work (D0 needs access and magnet has to hold on..).

<!-- Comment: Sat Apr  5 06;22;10 comment by...Sebastian -->
D0 is going in for a 3hrs access at 7:45am. Too little time for us... Shotset up after D0 is out.

<!-- Comment: Sat Apr  5 16;42;32 comment by...Sebastian -->
D0 came out of their "3hrs" access at 13:30, but TeV vacum problems would have delayed the shot anyhow. Right now their are doing a wet squeeze and shotsetup should follow soon. 

<!-- Comment: Sat Apr  5 18;44;00 comment by...Sebastian -->
Store 6026 just went in with initL=260E30, we are taking data.


<!-- Date: Sun Apr 6 08:15:04 2008 -->
D0 did not fix their problems with the muon system. store termination time will be set by runco later this morning. Not clear if D0 is going in yet.
<!-- Author: Sebastian -->