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<title>BTeam-2012-01-24</title>
Bteamers,<br>
<br>
Here are the notes from yesterday's weekly meeting. There was a lot
of discussion about the<br>
tune time on Thursday that attempted to install a new M56 optics in
the injection chicane<br>
but eventually was removed. Some issues were found in the model that
will be addressed,<br>
a LEMI configuration problem was fixed, some optics anomalies (such
as the<br>
disappearing/reappearing blown dispersion mismatch out of arc 2)
need understanding.<br>
We learned important things during that tune time, but we will be
more efficient if we<br>
have more time to plan and double-check for tuning; Yves's summary
at the end of what<br>
worked and what didn't will be helpful for the planning of the
5-pass spin-up; a plan is<br>
being developed that will be discussed and hopefully scheduled by
this week's beam<br>
studies scheduling meeting on Friday.<br>
<br>
Alex Bogacz has graciously agreed to chair the BTeam meeting while
I'm on travel<br>
to SLAC Jan 26-Feb 1 inclusive.<br>
<br>
-Todd<br>
<h1 class="title">BTeam-2012-01-24</h1>
<div class="outline-2">
<h2 id="sec-1">1 Optics on Call Report/Schedule</h2>
<ul>
<li>Rotates at BTeam (10:00 Tuesdays)<br>
</li>
<li>Medium-term machine development<br>
<ul>
<li><span class="done">DONE</span> Write 5-pass spin-up
ATLis (Jay, <a
href="https://cebaf.jlab.org/atlis/task/11894">a11894</a>),
relies on ARC9 box supply repair (ongoing)<br>
</li>
</ul>
</li>
<li>17 Jan-24 Jan: Vasily/Yves (Outgoing)<br>
<ul>
<li>SL has still been running few degrees off crest to
reduce Compton backgrounds (Jay)<br>
</li>
<li>Hall B sensitivity to energy drift of some concern
(Tief)<br>
</li>
<li>Mon 23 Jan Add M56 optics in injector (Yves/Jay, <a
href="https://cebaf.jlab.org/atlis/task/11924">a11924</a>)<br>
<ul>
<li>Not successful, see Yves's entry at <a
href="https://cebaf.jlab.org/elog/entry/1661381">e1661381</a><br>
</li>
<li>HGAP for inj chicane dipoles will be updated; 0L/0R
optics plan in the works<br>
</li>
<li>12h of tuning time: what was gained? How are we
accountable for that time?<br>
<ul>
<li>Who owns the process of unscheduled tuning?
Optics or plan owner should be focus; PD schedules
time<br>
</li>
<li>Scheduling for studies <1h later makes things
rushed, perhaps hours of inefficiency<br>
</li>
<li>OptiM to elegant translation can use better
efficiency (at least yesterday)<br>
</li>
<li>High sensitivity of Compton halo to 1L02 quad
was found at end in current configuration<br>
</li>
<li>Now running 2.5 degrees off crest in SL, better
than the 6+ degrees over weekend<br>
</li>
<li>We're very likely on the edge of something,
including scraping, based on large sensitivities<br>
</li>
<li>RayTrace would provide optics, may also well
provide an aperture check (Tief)<br>
</li>
<li>Spot was a lot tighter in 1A with the M56
improvement, so we will likely want to use this in
Feb<br>
</li>
<li>Is a longer laser pulse feasible for 180uA for
better injector transmission/Hall B? (Tief)<br>
</li>
<li>Alex: Can redesign an M56 optics with a stronger
1L02 quad setting for potentially improved
stability<br>
</li>
<li>Underlying cause of arc2 dispersion match blown?
Was seen in previous week as well (Jay/Spata/Tief)<br>
</li>
<li><span class="done">DONE</span> Jay has changed
LEM config file for NL to set 1L02 quad to 521.6
(as of AM Jan 24 2012)<br>
</li>
<li><span class="todo">TODO</span> injector rematch
with HGAP in 0R dipoles (Michele/Yves, report Feb
02 BTeam)<br>
</li>
<li><span class="todo">TODO</span> Address blown
arc2 dispersion match during Jan 25 beam studies
recovery (Optics)<br>
</li>
<li><span class="todo">TODO</span> Planning group
for M56: Yves/Jay/Tief/Alicia/Alex/Ed/Geoff/Yuhong<br>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li>24 Jan-31 Jan: Ed/Alex (Oncoming)<br>
<ul>
<li><span class="todo">TODO</span> Readdress injection
matching to NL, SL gang phase, Hall C Compton<br>
</li>
<li><span class="todo">TODO</span> Restore SL MOMOD after SL
on crest, confirm good Hall C Compton rates (Tief/ops)<br>
</li>
<li><span class="todo">TODO</span> Diagnose intermittent
problems in NL MOMOD (Musson? Tief? Plawski?)<br>
</li>
</ul>
</li>
<li>31 Jan-07 Feb: Yuhong/Geoff<br>
<ul>
<li>5-pass spin-up schedule? Mid-February for Hall A, but
early Feb for Hall B shift?<br>
</li>
</ul>
</li>
<li>07 Feb-14 Feb: Balsa/Todd<br>
</li>
<li>14 Feb-21 Feb: Fanglei/Mike Spata<br>
</li>
<li>21 Feb-28 Feb: Todd/Jay<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-2">2 Measuring Bunch Length using 1A Sync Light
Monitor (Tief)</h2>
<ul>
<li>New BTeam elog entry on this procedure: <a
href="https://cebaf.jlab.org/elog/entry/1661304">e1661304</a><br>
</li>
<li>Done capturing images from datacube; online bunch length
application may be resurrected (Michele/Tief)<br>
</li>
<li>Arne believes this will be resurrected when we have pure
digital cameras for 12 GeV<br>
</li>
<li><span class="todo">TODO</span> Prioritize and projectize for
long down (Arne)<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-3">3 C100 Status</h2>
<ul>
<li>26/52/79 Hz signal on 1/4 cryo drive gradient/phase
(Suleiman/Spata)<br>
</li>
<li>Beam studies rescheduled for Wed 25 Feb<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-4">4 Beam Studies Report 18 Jan 2012</h2>
<ul>
<li>Studies scheduled 08:00-20:00 (on time)<br>
<ul>
<li>
<a href="https://cebaf.jlab.org/atlis/task/11858">a11858</a>
0.0 C100: Search for 79 Hz (Parisitic, Suleiman/Spata;
strong 52 Hz on 1/4 cryo drive gradient/phase)
</li>
<li>
No other studies accomplished due to box supply failures,
repair
</li>
</ul>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-5">5 Beam Studies Scheduled 25 Jan 2012</h2>
<ul>
<li><span class="todo">TODO</span> Submit ATLis items for
desired beam studies for next week (25 Jan)<br>
</li>
<li>Same studies as last week based on lost time to box supply
failures<br>
</li>
<li>Studies scheduled 08:30-20:30<br>
<ul>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> —— 1.0
Optics: Fopts/allsaves
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11882">a11882</a>
8.0 C100: Stability testing (Hovater, Spata, etc, full
gradient on both C100s, 10uA)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11865">a11865</a>
1.0 Modeling: RayTrace validation (Bodenstein, Tief)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11885">a11885</a>
0.0 PePPo: Modeling (Grames, Contingency)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11849">a11849</a>
0.0 Mott: Mott DAQ Test (Suleiman, Contingency)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> —— 2.0
Optics: Restoration
</li>
</ul>
</li>
<li><span class="todo">TODO</span> Optics should write notes,
observations of fopt/etc to Bteam elog<br>
<ul>
<li>Include pathlength check (pathlength was good Mon day)<br>
</li>
</ul>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-6">6 Next week</h2>
<ul>
<li>Alex Bogacz has graciously agreed to chair while Todd is on
travel<br>
</li>
<li>Hall B to 5th pass ~ Feb 1?<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-7">7 From last week: Evaluate possibilities of Krest
during beam restoration (Okay)</h2>
<ul>
<li>Takes more like 4h to run through both linacs to get decent
results (Terry)<br>
</li>
<li>But Hall C doesn't get good data while Krest is running
either (but Hall B can)<br>
</li>
<li>Perhaps part of 2h can be a manual touch-up of cresting (15
min total, 2 operators)<br>
<ul>
<li><span class="todo">TODO</span> Todd has emailed Noel to
see if manual touch-up is acceptable weekly retune</li>
</ul>
</li>
</ul>
</div>
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