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<h1 class="title">B-team Meeting Notes</h1>
<div id="outline-container-1" class="outline-2">
<h2 id="sec-1"><span class="section-number-2">1</span> <span
class="timestamp-wrapper"> <span class="timestamp">2009-12-16 Wed
13:55</span></span> or <span class="timestamp-wrapper"> <span
class="timestamp">2009-12-17 Thu 13:30</span></span> Agenda </h2>
<div class="outline-text-2" id="text-1">
<p>Due to Hall-A collaboration meeting BTeam meeting may be moved to
Thursday. This will be the last meeting with me at the helm. Starting
in January 2010, BTeam will be led by Mike Tiefenback.<br>
</p>
</div>
<div id="outline-container-1.1" class="outline-3">
<h3 id="sec-1.1"><span class="section-number-3">1.1</span> Hall-B Dark
matter experiment <span class="tag"><span class="Stepanyan">Stepanyan</span></span></h3>
<div class="outline-text-3" id="text-1.1">
<p>Stepan will introduce us to a proposal for a dark matter search in
Hall-B that will likely need some optics support.
</p>
</div>
</div>
<div id="outline-container-1.2" class="outline-3">
<h3 id="sec-1.2"><span class="section-number-3">1.2</span> PRex
requirements </h3>
<div class="outline-text-3" id="text-1.2">
</div>
</div>
<div id="outline-container-1.3" class="outline-3">
<h3 id="sec-1.3"><span class="section-number-3">1.3</span> Shutdown
Issues </h3>
<div class="outline-text-3" id="text-1.3">
</div>
</div>
</div>
<div id="outline-container-2" class="outline-2">
<h2 id="sec-2"><a name="ID-939947c0-d164-4577-8ff3-c0ae80685a81"
id="ID-939947c0-d164-4577-8ff3-c0ae80685a81"></a><span
class="section-number-2">2</span> <span class="timestamp-wrapper"> <span
class="timestamp">2009-12-09 Wed 14:00</span></span> Agenda–Notes <span
class="tag"><span class="ATTACH">ATTACH</span></span></h2>
<div class="outline-text-2" id="text-2">
</div>
<div id="outline-container-2.1" class="outline-3">
<h3 id="sec-2.1"><span class="section-number-3">2.1</span> Brief Hall
Beam Quality Status </h3>
<div class="outline-text-3" id="text-2.1">
<p>Let's keep this short this time?
</p>
<ul>
<li id="sec-2.1.1">Discussion on scheduling measuring vertical
polarization <br>
Hall-A wants another measurement of the vertical polarization. Now is
a good time as Hall-B is still recovering from their target issues.
</li>
</ul>
</div>
</div>
<div id="outline-container-2.2" class="outline-3">
<h3 id="sec-2.2"><span class="section-number-3">2.2</span> Hall-B
g9-frost <span class="tag"><span class="Pasyuk">Pasyuk</span></span></h3>
<div class="outline-text-3" id="text-2.2">
<p>Double spin, polarized photon beam and polarized target. Frozen spin
target. Temperature under 50mK. Target cannot handle electron beam,
must put in protection to prevent electron beam transport beyond the
tagger magnet.
</p>
<ul>
<li id="sec-2.2.1">Beam Requirements <br>
Circular and linear polarized photons. For circular polarized portion
θ<sub>Wien</sub> will need to set to for polarized beam in both. Can
the energy be increased by 5 MeV to put CEBAF at a magic energy?
<ul>
<li>20nA
</li>
<li>instability of beam current < 5%
</li>
<li>σ<sub>xy</sub> < 150 μ m
</li>
<li>calibration runs down to 50pA
</li>
<li>bleedthrough < 10<sup>-3</sup>
</li>
<li>A<sub>I</sub> < 5× 10<sup>-4</sup>
</li>
</ul>
</li>
<li id="sec-2.2.2">Commissioning plans <br>
5 days of commissioning (concurrent with PREX commissioning) are
on the schedule.
<ul>
<li>electron beam tune up
</li>
<li>diamond alignment
</li>
<li>CLAS commissioning
</li>
<li>Commissioning of the gononiometer will take part at the
beginning of
the run during the commissioning phase.
</li>
<li>Would like a common setup for both linear and circular
portion. Is
this reasonable? Circular portion of the run would be easier if the
magnetic elements between 2C21 and tagger are active.
</li>
<li>No tune beam with photon beam blocker in place.
</li>
<li>Active collimator? maybe?
</li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-2.3" class="outline-3">
<h3 id="sec-2.3"><span class="section-number-3">2.3</span> Spring2010
run: Injection Chicane configuration <span class="tag"><span
class="Arne">Arne</span></span></h3>
<div class="outline-text-3" id="text-2.3">
<p>Should we return to running with some M<sub>56</sub> component in
the
injection chicane? Would this hide our sins? Make us less immune to
injector bunching issues? What other implications should be considered?
</p>
<ul>
<li id="sec-2.3.1">Discussion <br>
<ul>
<li>BPM screens need to be updated
</li>
<li>Model needs to be updated
</li>
<li>Phase offset in Injector cryomodules was a nagging issue when
operated in this configuration in the past. Can there be a way to
monitor the RF phase for these modules to make sure the phase offset
is in and stable? </li>
</ul>
</li>
<li id="sec-2.3.2"><span class="todo TODO"> TODO</span> Generate
ATLis <span class="tag"><span class="Arne">Arne</span></span><br>
<span class="timestamp-wrapper"><span class="timestamp-kwd">DEADLINE:
</span> <span class="timestamp">2010-01-25 Mon 09:21</span></span><br>
Generate the ATLIS to reconfigure the injector chicane to have a
non-zero M<sub>56</sub>. Get the Optics of Alex, work with Carlino on
the
BPM screens, work with Reza to understand the setup. Generate the
download files. Execute the plan.
</li>
</ul>
</div>
</div>
<div id="outline-container-2.4" class="outline-3">
<h3 id="sec-2.4"><span class="section-number-3">2.4</span> Viewer
limited BPMs <span class="tag"><span class="Tief">Tief</span></span></h3>
<div class="outline-text-3" id="text-2.4">
<p>Shift viewer limited mode, if the beam pulse is delay to coincide
with
the first 4μ sec afterpulse. This will put the viewer pulse in
time with the LINAC BPMs and all the other BPMS.
</p>
<p>
This is quoted as a firmware change. </p>
<p>
<span class="timestamp-wrapper"> <span class="timestamp">2009-12-09 Wed</span></span><br>
Roger has been requested to add this to his work list for the Winter
2010 down. At a lower priority compared to what is already on his
list. </p>
</div>
</div>
<div id="outline-container-2.5" class="outline-3">
<h3 id="sec-2.5"><span class="section-number-3">2.5</span> PREX
Requirements </h3>
<div class="outline-text-3" id="text-2.5">
<p>Quick review of the PREX requirements which can be found at:
<a
href="http://hallaweb.jlab.org/parity/prex/PREX_Beam_Requirements.pdf">http://hallaweb.jlab.org/parity/prex/PREX<sub>Beam</sub><sub>Requirements</sub>.pdf</a>
Please read the "Special Considerations" section carefully. We
will need to develop a plan as to how Accelerator is going to
address these requirements and considerations.
</p>
<p>
<span class="timestamp-wrapper"> <span class="timestamp">2009-12-10 Thu</span></span><br>
Conversation with Kees, reminded me that the Hall-A collaboration
meeting will be next Wednesday. So it will be difficult to get PREX's
attention on Wednesday. This may mean that next week's Bteam meeting
may occur at a different time.
</p>
</div>
</div>
<div id="outline-container-2.6" class="outline-3">
<h3 id="sec-2.6"><span class="section-number-3">2.6</span> Large
Synchronous Data (LSD) Effort <span class="tag"><span class="Michele">Michele</span> <span
class="Arne">Arne</span></span></h3>
<div class="outline-text-3" id="text-2.6">
<p>An effort to come to terms with the expected large data volume of
the 12 GeV era epics system has been started. The RF systems, DDA,
BLA systems will have a large number of waveforms available for
analysis. A small team has been formed to develop requirements and
analysis frameworks for the data. </p>
<p>
At present we are also thinking
of adding a global
<a
href="http://www.aps.anl.gov/epics/meetings/2006-06/Timing_Systems/Micro_Research_Timing_Components.ppt">event
system</a>. So that the epics records can be synchronized.
</p>
<p>
The team will need help from Bteam on this project. For example:
</p>
<ol>
<li>How well should the data be synchronized?
</li>
<li>Any thoughts on analysis frameworks? Root? R? ScientificPython?
</li>
<li>Any thoughts on data structure? Root Trees? netCDF?
</li>
</ol>
</div>
</div>
<div id="outline-container-2.7" class="outline-3">
<h3 id="sec-2.7"><span class="section-number-3">2.7</span> Next Week </h3>
<div class="outline-text-3" id="text-2.7">
</div>
</div>
</div>
<div id="postamble">
<p class="date"> Date: 2009-12-11 09:31:22 EST</p>
<p class="creator">HTML generated by org-mode 6.33trans in emacs 23</p>
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<br>
<pre class="moz-signature" cols="72">--
Arne Freyberger
Director Operations Department
Jefferson Lab Phone: (757) 269-6268
12000 Jefferson Avenue Pager: (757) 584-6268
Newport News, VA 23606 Email: <a class="moz-txt-link-abbreviated" href="mailto:freyberg@jlab.org">freyberg@jlab.org</a>
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