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<title>BTeam-2012-02-14</title>
BTeamers,<br>
<br>
Here are some notes and references from last week's BTeam meeting.<br>
There will be a BTeam meeting tomorrow at 11 AM in MCC: agenda<br>
items include Arne's call for campaign estimates, a slide from Alex<br>
on injector chicane m56 initial bunch distribution, and Tief on
outlook<br>
for pathlength and MOMOD as we move towards 5-pass operations.<br>
I'll send out an agenda tonight or tomorrow morning after we have
the<br>
study list from Arne. See you tomorrow!<br>
<br>
-Todd<br>
<br>
<h1 class="title">BTeam 2012-02-14</h1>
<div class="outline-2">
<h2 id="sec-1">1 Optics on Call Report/Schedule</h2>
<ul>
<li>07 Feb-14 Feb: Balsa/Todd<br>
<ul>
<li>Hall C burn-through monitor failure early Sun Feb 12;
evaluating dump safety for current operations<br>
</li>
<li><span class="done">DONE</span> Injector chicane m56
installed (<a
href="https://cebaf.jlab.org/atlis/task/11955">a11955</a>,
<a href="http://cebaf.jlab.org/elog/entry/1664243">e1664243</a>)
Wed Feb 8<br>
</li>
<li><span class="done">DONE</span> Great optics with HGAP
improvement in injector chicane model (Yves/Alex/AHLA)<br>
</li>
<li><span class="done">DONE</span> Rematched injector to NL
in single iteration (Yves/Alex, <a
href="http://cebaf.jlab.org/elog/entry/1664161">e1664161</a>)<br>
</li>
<li><span class="done">DONE</span> SL restored to crest,
cavities recrested<br>
</li>
<li><span class="todo">TODO</span> SL MOMOD not restored to
operation, still possible LO problems (<a
href="http://cebaf.jlab.org/elog/entry/1664255">e1664255</a>);
NL MOMOD repaired<br>
<ul>
<li>
Tief: SL system still not working properly, likely to
be failure in AM setup for breadboarded SL MOMOD
</li>
<li>
Perhaps SL MOMOD breadboard can have AM re-nulled to
limit Hall C sensitivity to SL MOMOD (energy
modulation)
</li>
</ul>
</li>
<li><span class="todo">TODO</span> Address hall B orbit lock
issues (<a href="http://cebaf.jlab.org/elog/entry/1664282">e1664282</a>)<br>
<ul>
<li>
Michele: Looks more like a nA BPM problem,
Alicia/Keith Cole working on this; deadband too big,
being changed
</li>
<li>
Hall B beam returns Thu PM Feb 16 into Fri Feb 17
</li>
<li>
Beam scraping monitor being decommissioned
</li>
</ul>
</li>
</ul>
</li>
<li>14 Feb-21 Feb: Fanglei/Mike Spata<br>
<ul>
<li><span class="todo">TODO</span> 5-pass spin-up started
Mon Feb 13 (later close to achieved owl Thu Feb 16, <a
href="http://cebaf.jlab.org/elog/entry/1665362">e1665362</a>)<br>
<ul>
<li>
Hot spot in 6R (<a
href="http://cebaf.jlab.org/elog/entry/1665034">e1665034</a>)
from Mon Feb 13 setup; some problems with
pathlength/arc dipole adjustments
</li>
</ul>
</li>
<li>Injector 3-beam, polarity setups in process Day Tue Feb
14<br>
</li>
<li>RSEP8 spare is in place for spin-up<br>
</li>
<li>~24 Feb Hall A g2p start? 20 Feb? Who knows? (Yves)<br>
</li>
</ul>
</li>
<li>21 Feb-28 Feb: Todd/Jay<br>
</li>
<li>28 Feb-06 Mar: Rui/Tief<br>
</li>
<li>06 Mar-13 Mar: Vasily/Yves<br>
</li>
<li>13 Mar-20 Mar: Balsa/Alex<br>
</li>
<li>20 Mar-27 Mar: Yuhong/Geoff<br>
</li>
<li>27 Mar-03 Apr: Ed/Todd<br>
</li>
<li>03 Apr-10 Apr: Fanglei/Mike<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-2">2 Injector Chicane m56 (Alex)</h2>
<ul>
<li>Slides available <a
href="http://www.toddsatogata.net/BTeam/2012-02-14-InjectorM56Longitudinal-AlexBogacz.ppt">here</a><br>
</li>
<li>Alex's OptiM evaluation shows that a longitudinally
uncorrelated incoming 6.3 MeV beam should have minimal bunch
length near an 0L04 off-crest angle of 16 degrees.<br>
</li>
<li>Yves found that this optimum is closer to 12 degrees with
careful scanning during Wed Feb 8 m56 beam studies<br>
</li>
<li>Geoff and Alex recommend that we investigate injector
longitudinal dynamics<br>
</li>
<li>Injector longitudinal studies were last done c. 1995 or so<br>
</li>
<li>There will be a group assembled to address and study this
for the long term, particularly in light of injector upgrade
plans<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-3">3 Pathlength and MOMOD (Tief)</h2>
<ul>
<li>Deferred to Feb 21 BTeam meeting<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-4">4 C100 Status</h2>
<ul>
<li>Have been running well with 2L24 since Thu 26 Jan with few
problems<br>
</li>
<li>Zone ESET is 75.04 MeV (GSET 13.4 for each cavity)<br>
</li>
<li>Running with 2L24/2L25 as of eve Mon 13 Feb, each zone ESET
~90 MeV<br>
<ul>
<li>
Would like to run at drive highs with beam; some concerns
about window power, radiation damage
</li>
</ul>
</li>
<li>Drury radiation studies Mon Feb 13, probe calibration
problems<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-5">5 Manual linac RF cresting</h2>
<ul>
<li>QWeak cannot run while Krest is running<br>
</li>
<li>Have been routinely manually touch up cresting<br>
</li>
<li>~15 minutes by two experienced operators<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-6">6 Beam Studies Report 8 Feb 2012 (Wednesday)</h2>
<ul>
<li>
<b>[X]</b> —— 0.5 Optics: Fopts/allsaves (fopt/pathlength)
</li>
<li>
[-] <a href="https://cebaf.jlab.org/atlis/task/11932">a11932</a>
2.0 C100: Radiation Production Characterization of C100-1/2
(Drury, PARASITIC to m56)
Not done due to lack of access time for m56 studies
</li>
<li>
<b>[X]</b> <a href="https://cebaf.jlab.org/atlis/task/11955">a11955</a>
8.0 Program: Injector m56 Setup
(Krafft/Roblin/Benesch/Satogata/etc)
</li>
<li>
<b>[X]</b> <a href="https://cebaf.jlab.org/atlis/task/11979">a11979</a>
1.0 PEPPo: Magnet Test (Grames)
</li>
<li>
<b>[X]</b> —— 2.0 Optics: Restoration
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-7">7 Beam Studies Report 13-15 Feb 2012 (Mon-Weds)</h2>
<ul>
<li>Many opportunistic beam studies were performed during the
Hall C Burn-Thru Detector investigation<br>
</li>
<li>Many PEPPo items (<a
href="http://cebaf.jlab.org/elog/entry/1664892">e1664892</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664893">e1664893</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664893">e1664893</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664894">e1664894</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664895">e1664895</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664896">e1664896</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664898">e1664898</a>,<a
href="http://cebaf.jlab.org/elog/entry/1664899">e1664899</a>)<br>
</li>
<li>Many Mott items (<a
href="http://cebaf.jlab.org/elog/entry/1665088">e1665088</a>,<a
href="http://cebaf.jlab.org/elog/entry/1665091">e1665091</a>,<a
href="http://cebaf.jlab.org/elog/entry/1665101">e1665101</a>,<a
href="http://cebaf.jlab.org/elog/entry/1665112">e1665112</a>,<a
href="http://cebaf.jlab.org/elog/entry/1665492">e1665492</a>)<br>
</li>
<li>Several Modeling items (arc4 <a
href="http://cebaf.jlab.org/elog/entry/1665390">e1665390</a>
with BPM problems, arc6 <a
href="http://cebaf.jlab.org/elog/entry/1665398">e1665398</a>
needs to be redone with resample on)<br>
</li>
<li>Zigzag harp at IHA0L07 (<a
href="http://cebaf.jlab.org/elog/entry/1665356">e1665356</a>)<br>
</li>
<li>Yao system evaluation (<a
href="http://cebaf.jlab.org/elog/entry/1665501">e1665501</a>,
Yao at start of NL needs retuning <a
href="https://cebaf.jlab.org/atlis/task/12049">a12049</a>,
will impact m56 studies)<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-8">8 Next week</h2>
<ul>
<li>Hall A is starting up around Feb 20??<br>
</li>
<li>Hall C compton orbit lock wants to investigate more
parameters/correctors/BPMs (Mark/Jay/Yves/Alicia)<br>
</li>
<li>~12 weeks left, Arne collecting estimates on remaining ~144h
of beam studies<br>
<p>
======================================================================
</p>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-9">9 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><span class="todo">TODO</span> Prioritize and projectize for
long down (12 GeV cameras, Arne)<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-10">10 Improvements to Krest vs manual cresting,
impact in 12 GeV era (Noel/Jay)</h2>
</div>
<div class="outline-2">
<h2 id="sec-11">11 Hall C compton orbit lock missing DOF
(Mark/Jay/Yves/Alicia)</h2>
</div>
<div class="outline-2">
<h2 id="sec-12">12 Online pathlength prototyping before long
shutdown (Tief)</h2>
</div>
<div class="outline-2">
<h2 id="sec-13">13 Injector bunch length, m56 optimization group
(Geoff/Alex/Reza/Todd)<br>
</h2>
</div>
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