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</style>BTeam,<br>
<br>
Here is the agenda for this afternoon's BTeam meeting, the last of
this year's run. We<br>
will continue to have BTeam meetings during the shutdown, focusing
on analysis of<br>
existing data, reports on systems that impact test plans, and
accelerator physics planning<br>
for the restart in the fall. Thank you for all your help and support
through the run -- we<br>
have a lot to be proud of.<br>
<br>
-Todd<br>
<h1 class="title">BTeam-2011-05-11</h1>
<div class="outline-2">
<h2 id="sec-1">1 2011-05-04 Wed 14:00 BTeam Meeting Agenda</h2>
<div class="outline-3">
<h3 id="sec-2">1.1 Short meeting today since JLab RunAround is
at 15:00ish</h3>
</div>
<div class="outline-3">
<h3 id="sec-3">1.2 End of Run this Friday, 2011-05-13! QWeak
party at 14:00 on Friday.</h3>
</div>
<div class="outline-3">
<h3 id="sec-4">1.3 Strategic Priorities for BTeam</h3>
<div class="outline-4">
<h4 id="sec-5">1.3.1 <span class="done">DONE</span> Mott
polarimeter precision</h4>
</div>
<div class="outline-4">
<h4 id="sec-6">1.3.2 <span class="done">DONE</span>
Pathlength Correction with MO</h4>
</div>
<div class="outline-4">
<h4 id="sec-7">1.3.3 <span class="done">DONE</span> CEBAF
baseline</h4>
</div>
<div class="outline-4">
<h4 id="sec-8">1.3.4 <span class="done">DONE</span>
LOCO/RayTrace data, improvements</h4>
</div>
<div class="outline-4">
<h4 id="sec-9">1.3.5 <span class="done">DONE</span> Optics
machine/model improvements</h4>
</div>
<div class="outline-4">
<h4 id="sec-10">1.3.6 <span class="done">DONE</span>
Additional bunchlength measurement, optimization</h4>
</div>
<div class="outline-4">
<h4 id="sec-11">1.3.7 <span class="done">DONE</span> Support
of current experiments</h4>
</div>
<div class="outline-4">
<h4 id="sec-12">1.3.8 <span class="todo">TODO</span>
ORFP/Troubleshooting Guide Update (for six month SAD)</h4>
</div>
</div>
<div class="outline-3">
<h3 id="sec-13">1.4 Optics-on-Call Report: Balsa (May
4-7)/Byung/Yves</h3>
</div>
<div class="outline-3">
<h3 id="sec-14">1.5 Beam Studies Report</h3>
<div class="outline-4">
<h4 id="sec-15">1.5.1 <span class="done">DONE</span> 6T
Multipole Measurements part IV: Spata</h4>
<p><a href="http://cebaf.jlab.org/atlis/task/11123">ATLis
11123</a>: Done Thu 2011-05-05, see <a
href="https://cebaf.jlab.org/elog/elog_item.php?elog_id=1627270">e1627270</a>.
Data looks lovely,
very nice modulations.
</p>
</div>
<div class="outline-4">
<h4 id="sec-16">1.5.2 <span class="done">DONE</span> RayTrace
data at : Bodenstein</h4>
<p>No ATLis: RayTrace data was collected at IPM1A01 launched
from
MBT1E02H/03H and MBT1E02V/03V.
</p>
</div>
<div class="outline-4">
<h4 id="sec-17">1.5.3 <span class="done">DONE</span> Injector
Bunchlength 130kV test: Kazimi et al</h4>
<p><a href="http://cebaf.jlab.org/atlis/task/11129">ATLis
11129</a>: Done Thu 2011-05-05, see <a
href="https://cebaf.jlab.org/elog/elog_item.php?elog_id=1627339">e1627339</a>.
The bunchlength program
worked without expert intervention for 130kV gun settings,
showing a
need for a 3 degree change to the chopper phase. This should
be ready
to go for next year.
</p>
</div>
<div class="outline-4">
<h4 id="sec-18">1.5.4 <span class="done">DONE</span> FRAGMO
path length changes: Tiefenback</h4>
<p><a href="http://cebaf.jlab.org/atlis/task/11152">ATLis
11152</a>: Done Thu 2011-05-05, see <a
href="https://cebaf.jlab.org/elog/elog_item.php?elog_id=1627411">e1627411</a>.
Meant to bring opsig
signals to specified limits; worked well for NL but not so
well for
SL. Another adjustment was made when pathlength was
problematic on
swing shift Sun 2011-05-08 after the pass change, see
summary from
Tief in <a
href="https://cebaf.jlab.org/elog/elog_item.php?elog_id=1627974">e1627974</a>,
with more followup in <a
href="https://cebaf.jlab.org/elog/elog_item.php?elog_id=1628141">e1628141</a>.
</p>
</div>
<div class="outline-4">
<h4 id="sec-19">1.5.5 <span class="done">DONE</span> BFM or
Bust, Mott test: Grames, Suleiman</h4>
<p><a href="http://cebaf.jlab.org/atlis/task/11042">ATLis
11042</a>: Done Mon 2011-05-09, see <a
href="https://cebaf.jlab.org/elog/elog_item.php?elog_id=1628117">e1628117</a>.
Patched LLRF through BFM,
set up multiple beams, then B/C beam to Mott for Mott tests.
BFM sync
signal moderately noisy, but still some improvement in out
of time
electron rejection.
</p>
</div>
<div class="outline-4">
<h4 id="sec-20">1.5.6 <span class="done">DONE</span> 2L21
Shake Test</h4>
<p>No ATLis? Testing sensitivity to microphonics, ~1-100Hz, in
2L21
cryomodule similar to afflicted R100 assembly.
</p>
</div>
<div class="outline-4">
<h4 id="sec-21">1.5.7 <span class="done">DONE</span> QWeak
Injector Tests: Paschke, Dalton, et al</h4>
<p><a href="http://cebaf.jlab.org/atlis/task/11081">ATLis
11081</a>, <a
href="http://cebaf.jlab.org/atlis/task/10625">10625</a>:
Verify zero point of hall C IA cell, adjust
rotatable HWP and Pockels cell translation. Done Mon
2011-05-09.
</p>
</div>
<div class="outline-4">
<h4 id="sec-22">1.5.8 <span class="done">DONE</span> Arc2
LOCO/RayTrace optics tests: Yves</h4>
<p><a href="http://cebaf.jlab.org/atlis/task/11166">ATLis
11166</a>: Continued optics evaluation of machine, now in
Arc2.
Install new optics in Arc2 and perform LOCO measurements.
Acquired
data Tue 2011-05-10 for Arc2 baseline before 6 month SAD
H-steel
magnet retrofit.
</p>
</div>
</div>
<div class="outline-3">
<h3 id="sec-23">1.6 6 Month SAD Items: Upcoming</h3>
<div class="outline-4">
<h4 id="sec-24">1.6.1 2011-05-18: C100 BBU/low energy/Hall C:
Todd/Shahid/Ilkyoung</h4>
</div>
<div class="outline-4">
<h4 id="sec-25">1.6.2 ?: Quad centering/beam-based alignment
(Concern from Spata)</h4>
</div>
<div class="outline-4">
<h4 id="sec-26">1.6.3 Generate specs for golden zero rels
(perhaps not just injector): Mike McCaughin</h4>
</div>
</div>
<div class="outline-3">
<h3 id="sec-27">1.7 6 Month SAD Items: This Week</h3>
<div class="outline-4">
<h4 id="sec-28">1.7.1 Reworked dipole magnet hysteresis end
points: Arne/Tief/Spata/etc</h4>
<p>Leigh Harwood has requested input on top ends of hysteresis
loops for
reworked magnet measurements, for 6 and 12 GeV, for the 6
month SAD.
See the attached spreadsheet, which has blanks in the Hmax
setting
column [H] that we should fill in. Data for Arc10 is already
in hand.
Questions:
</p>
<ol>
<li>
Are there strong preferences for Hmax relative to 12GeV
settings
and power supply Imax?
</li>
<li>
Will measure some unmodified magnets on 6GeV loops to
understand
shim requirements in case of disaster. Are Hmax settings
setup
dependent? If so, what settings should be used?
</li>
</ol>
<p>Tief notes that it's best to run on the calibrated part of
the
curves from the bottom up, so the hysteresis only depends on
minimum current and not previous peak current. Historically
we
have had some problems at ~20A where PS have tripped at the
low
end and the low side of the current had to be adjusted by
3-4A. This caused a problem at least once in either Hall A
or C
(can't now remember which) at the 1%-2% energy calibration
level.
It was associated with using control points which were much
less
than 10% of peak dipole current values.
</p>
<p>
To address Leigh's particular question, I would expect the
power
supplies to be set to use something like
min[Max<sub>Rated</sub><sub>Current</sub>, (Max<sub>InService</sub><sub>Current</sub>*1.05)]
as
peak hysteresis current. And I'd hope for a margin of more
than 5% above Max<sub>InService</sub><sub>Current</sub> for
the Max<sub>Rated</sub><sub>Current</sub>
number. This seems to me to be a sufficient answer. It is an
"ask me and I'll tell you what I think" number, but I think
that
it is defensible from an operations and calibration
standpoint. I
am swayable on this issue by any others of you who think
differently. We should have a discussion to confirm or
modify
this prior to transmitting a firm answer to Leigh.
</p>
<p>
Arne dug up the existing Hmax values: Arc2 210, Arc4 230,
Arc6 305,
Arc7 240, Arc8 270, Arc9 305. Should we just have Leigh use
these?
</p>
</div>
</div>
</div>
<div id="postamble">
<p class="author"> Author: Todd Satogata
<a href="mailto:satogata@Todd-Satogatas-MacBook-Pro.local"><satogata@Todd-Satogatas-MacBook-Pro.local></a>
</p>
<p class="date"> Date: 2011/05/11 12:33:56</p>
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