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<title>BTeam-2012-02-21</title>
BTeamers,<br>
<br>
Here are the notes from last Tuesday's meeting. We have beam studies
today<br>
as detailed in Arne's email, so today's meeting may well be short
depending<br>
on MCC activities. See you in the MCC meeting room at 11!<br>
<br>
-Todd<br>
<h1 class="title">BTeam-2012-02-21</h1>
<div class="outline-2">
<h2 id="sec-1">1 Optics on Call Report/Schedule</h2>
<ul>
<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>
<li>
Really about 4-pass done so far, 5th pass still needs
setup but question about energy (1e-3 level)
</li>
<li>
Hot spot was really inline dump (150 uA for many
hours) and not adjacent dipole, now limited to 0.5h
(/shift?)
</li>
<li>
ARC4 offset by 3.5 mm, pathlength needs to be
revisited (see Weds Feb 22 studies plan to adjust MO)
</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>
<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>
<li>
20 min interruption for John to remove, another to
replace; coordinate with C100 recovery training?
</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>
<li>
Still offline, ATLis in place for testing after
electron run (Keith)
</li>
</ul>
</li>
<li><span class="todo">TODO</span> Traditional CMPQ (OptiM
vs elegant) completely disagree: resolve path forward for
present run and 12 GeV (Yves/Todd/AHLA)<br>
</li>
</ul>
</li>
<li>21 Feb-28 Feb: Todd/Jay<br>
<ul>
<li><span class="todo">TODO</span> Hall A returning ~Feb 27
but still uncertainty at level of o(3d)<br>
</li>
<li><span class="todo">TODO</span> Modify MST for Hall A,
prepare for hall commissioning (Yves/Jay)<br>
</li>
<li><span class="todo">TODO</span> Hall C compton lock
clarification (Jay/Alicia/AHLA)<br>
</li>
<li><span class="done">DONE</span> Injector m56 lattice to
AHLA (Yves, done 2012-02-21 PM)<br>
</li>
<li><span class="todo">TODO</span> Dennis Turner working on
RF health check over ~1shift time period; check vs 0R03
trips? (Jay)<br>
</li>
<li><span class="todo">TODO</span> Capture forward power
degrading? (Yan/Clyde)<br>
</li>
</ul>
</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/Geoff)</h2>
<ul>
<li>Alex has a new slide available <a
href="http://www.toddsatogata.net/BTeam/2012-02-18-InjectorM56Longitudinal-AlexBogacz.ppt">here</a>
; Geoff wrote a note on injector M56 available <a
href="http://www.toddsatogata.net/BTeam/2012-02-20-OptimizationOfM56-GeoffKrafft.pdf">here</a>.<br>
</li>
<li>Alex's slide shows an initial longitudinal chirp that fits
the 12 degree 0L04 phasing experience<br>
</li>
<li>Reza states that 1/4 cryo has been running off crest 14
degrees (ish) for this entire run<br>
<ul>
<li>
This seems at least not inconsistent with Alex's
calculations
</li>
</ul>
</li>
<li><span class="todo">TODO</span> Retune Yao cavity for bunch
length measurements coming out of injector<br>
<ul>
<li>
Opportunistic retune (Steve/Arne), though Mon Feb 20
current-dependent 0R03 trips might indicate some bunch
length/halo issues (Tief)
</li>
<li>
No phases were intentionally changed during various recent
spin setups, though some tail being folded in (Reza)
</li>
</ul>
</li>
<li><span class="todo">TODO</span> Assemble team to address and
study this for the long term (including injector upgrade
plans?)<br>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-3">3 Pathlength and MOMOD (Tief)</h2>
</div>
<div class="outline-2">
<h2 id="sec-4">4 Strategizing for Remainder of Run (Arne/Todd)</h2>
<ul>
<li>~12 weeks, ~144h of beam studies remaining in 6 GeV era<br>
</li>
<li>C100 campaign mostly parasitic at this point<br>
</li>
<li>Arne is collecting input to estimate, prioritize remaining
studies<br>
<ul>
<li>
Have input from modeling, will get input from PEPPo soon
</li>
<li>
Physics wants to know how much time they'll get if we
don't expect to use all projected beam study time
</li>
<li>
Spata happy with present status/projections of campaigns
for 12 GeV commissioning (particularly C100)
</li>
</ul>
</li>
</ul>
</div>
<div class="outline-2">
<h2 id="sec-5">5 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-6">6 Beam Studies Planning 08:30 22 Feb 2012
(Wednesday)</h2>
<ul>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> —— 0.5
Optics: fOpts/allsaves
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11152">a11152</a>
2.0 Program: MO wavelength change/change doglegs/multipass
ORFP (Tief, to dumplettes)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/9741">a9741</a> —
Model: Arc 3/4 RayTrace vs CS (Tief/Ryan, to dumplettes;
bump?)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> —— 1.0
Program: SL MO remove/repair/replace (John Musson/Tief, ATLis
in place)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11695">a11695</a>
2.0 C100: Training (Curt et al, beam to Inj, 12:00-14:00)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> —— 2.0
PEPPo: Development parisitic to C100 training
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11997">a11997</a>
0.5 Model: RayTrace to/through Hall C (Tief/Ryan, to C)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> <a
href="https://cebaf.jlab.org/atlis/task/11933">a11933</a>
0.5 Model: Long Pulse Width Test (Tief, to C, high current)
</li>
<li>
<b>[<span style="visibility:hidden;">X</span>]</b> —— 1.5
Optics: Restoration (Continue with multipass ORFP, at least
3-pass)
</li>
</ul>
<p>======================================================================
</p>
</div>
<div class="outline-2">
<h2 id="sec-7">7 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-8">8 Improvements to Krest vs manual cresting, impact
in 12 GeV era (Noel/Jay)</h2>
</div>
<div class="outline-2">
<h2 id="sec-9">9 Hall C compton orbit lock missing DOF
(Mark/Jay/Yves/Alicia)</h2>
</div>
<div class="outline-2">
<h2 id="sec-10">10 Online pathlength prototyping before long
shutdown (Tief)</h2>
</div>
<div class="outline-2">
<h2 id="sec-11">11 Injector bunch length, m56 optimization group
(Geoff/Alex/Reza/Todd)</h2>
</div>
<div class="outline-2">
<h2 id="sec-12">12 Upgrade ARC1 fOpt correctors? (Spata's
dissertation correctors could be used, currently in 6T)</h2>
</div>
<div id="postamble"><br>
</div>
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