[Bteam] Wed Dec 1 2010 meeting notes
Todd Satogata
satogata at jlab.org
Thu Dec 2 13:11:11 EST 2010
Here are the BTeam meeting notes from yesterday's BTeam meeting. Arne will run
the meeting next week while I'm on travel.
-Todd
--------------+---------------------------+----------------+------------------
Todd Satogata | CASA Group, Jefferson Lab | (757) 269-6281 | satogata at jlab.org
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BTeam 2010-12-01
================
Date: 2010/12/02 13:07:14
Table of Contents
=================
1 2010-12-01 Wed 14:00 BTeam Meeting Agenda
1.1 Optics-on-Call Report: Hofler
1.2 Beam Studies Report: All
1.2.1 Pathlength Analysis: Yunn
1.2.2 Arc9 model calibration test: Roblin
1.2.3 Hall C double peak source found/resolved? Suleiman
1.3 Beam Studies Planning: All
1.3.1 Thursday 2010-12-02 and Tuesday 2010-12-07 Plans: Suggested
1.3.2 Thursday 2010-12-02 Plans: Decided
1.3.3 Tuesday 2010-12-07 Plans: Decided
1.4 FY11 BTeam Projects
1.4.1 BSY Diagnostics: Benesch
1.5 Anything else?
1.5.1 Optics: Hofler, Kazimi
1 2010-12-01 Wed 14:00 BTeam Meeting Agenda
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1.1 Optics-on-Call Report: Hofler
=================================
Summary of the thankful week
Fri: Hall C Compton scan -- done.
Weekend: Energy stability problems, gang phase lock still
a problem? A power cycle may be required; readback may
be invalid; also an observed current dependence in tracking.
Wed: Hall C Compton backed out, halo counts up, fixed by
rephasing. Need to get back through Compton. Still an open
issue, should revisit after spot move on Thursday 12-02.
1.2 Beam Studies Report: All
============================
1.2.1 Pathlength Analysis: Yunn
-------------------------------
Status of the analysis effort of the tunnel heating/pathlength
five-pass test in September, final report due next week. Byung's
draft report is attached. Fig 1 shows slower cooling than warming.
12 GeV conditions will likely give RF shift of 2-3 degrees/arc.
15F LCW rise was half of 12 GeV conditions; concrete temp did not
asymptote. Should we reperform this study with a longer test and/or
higher temperature? Is this enough data to draw conclusions?
Should we get a baseline to separate out baseline pathlength
changes vs temperature-driven changes? This is small compared
to expected effect. Estimate that these are acceptable but more
numbers on air/wall temp and air conditioning required. Should
pull sensors for data and compare, and plan to deliver conclusions
before winter break (Tief).
1.2.2 Arc9 model calibration test: Roblin
-----------------------------------------
[ATLiS entry 10511]. Multiple RF FSD trips, ran fopt three times, not
necessarily complete, requires data quality review by Yves.
1.2.3 Hall C double peak source found/resolved? Suleiman
--------------------------------------------------------
[See below elog entry]. Can we get a troubleshooting/diagnostic?
Or have we lost some troubleshooting for low current by turning
off the beam scraping monitor? It is a useful archived diagnostic
and should evaluate whether we can turn it back on in future.
We should ensure that it stays off until we want it back on.
Was also used as low-level transfer function monitor, monitoring
for changes in lattice. We will return to this in the future to
see if it can be acceptably turned back on. We'll modify app and
send signals to Qweak for monitoring in the meantime.
http://opweb.acc.jlab.org/CSUEApps/elog/entry/1555706
1.3 Beam Studies Planning: All
==============================
1.3.1 Thursday 2010-12-02 and Tuesday 2010-12-07 Plans: Suggested
-----------------------------------------------------------------
* Tuesday 2010-12-07
CHL power switch uncertainties, injector cathode activation (~12h).
TPE also scheduled to start operations at start of evening shift.
* Compton backgrounds (hall A)
* Injector development for Hall C/Qweak (Dalton, Benesch), ~4h (to 12h?)
[ATLiS entry 10271], Rebalance systematics, RHWP scans/PC translation scans.
Was done before but with IHWP in wrong orientation. Oops! May require
some time both days.
Estimate 4h Thu 12-02, 8h Tue 12-07 (laser table in conjunction with
Cathode activation, total time 12h)
* One pass stripline BPM test, ~1h
[ATLiS entry 10445], Large dynamic range of currents (100uA to >=100 nA CW)
for BPM linearity test. Access required, not time critical; can wait
for next access.
* Repeat of Arc9 model calibration test?, ~2h
[ATLiS entry 10511,] should wait for Yves evaluation of existing data to see
if its enough for his analysis.
* Cryomodule JT valve test?, ~10h
[ATLiS entry 7874], Has been lingering since June. Requires beam off.
Also requires Jonathan Creel's availability.
1.3.2 Thursday 2010-12-02 Plans: Decided
----------------------------------------
* Move spot (0.5h)
* Injector development for QWeak (4h)
* Compton background tuning (0.5-1h)
1.3.3 Tuesday 2010-12-07 Plans: Decided
---------------------------------------
* Injector development for QWeak, laser table, cathode activation (8-12h)
1.4 FY11 BTeam Projects
=======================
1.4.1 BSY Diagnostics: Benesch
------------------------------
Details of the FY11 BSY diagnostics effort: showed list of 5 diagnostics
suggestions on overhead (FY11 diagnostic suggestions). Discussions of
whether to relocate harps back to E03 crosses, or install new crosses
in front of S10 girders for optics matching after each recombiner for
12 GeV upgrade commissioning development.
* TODO ATLiS to test optics measurements at 1E03/2S10 (before Jan 2011 optics)
* TODO Work up detailed tabular strawman, cost/resource estimates (Benesch)
* TODO Cross-check injector harp optics match measurement consistency
1.5 Anything else?
==================
1.5.1 Optics: Hofler, Kazimi
----------------------------
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