<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<title>B-team Meeting Notes</title>
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="generator" content="Org-mode">
<meta name="generated" content="2010-12-13 15:37:41 EST">
<meta name="author" content="Arne Freyberger">
<meta name="description" content="">
<meta name="keywords" content="">
<style type="text/css">
<!--/*--><![CDATA[/*><!--*/
html { font-family: Times, serif; font-size: 12pt; }
.title { text-align: center; }
.todo { color: red; }
.done { color: green; }
.tag { background-color: #add8e6; font-weight:normal }
.target { }
.timestamp { color: #bebebe; }
.timestamp-kwd { color: #5f9ea0; }
p.verse { margin-left: 3% }
pre {
border: 1pt solid #AEBDCC;
background-color: #F3F5F7;
padding: 5pt;
font-family: courier, monospace;
font-size: 90%;
overflow:auto;
}
table { border-collapse: collapse; }
td, th { vertical-align: top; }
dt { font-weight: bold; }
div.figure { padding: 0.5em; }
div.figure p { text-align: center; }
.linenr { font-size:smaller }
.code-highlighted {background-color:#ffff00;}
.org-info-js_info-navigation { border-style:none; }
#org-info-js_console-label { font-size:10px; font-weight:bold;
white-space:nowrap; }
.org-info-js_search-highlight {background-color:#ffff00; color:#000000;
font-weight:bold; }
/*]]>*/-->
</style>
<script type="text/javascript">
<!--/*--><![CDATA[/*><!--*/
function CodeHighlightOn(elem, id)
{
var target = document.getElementById(id);
if(null != target) {
elem.cacheClassElem = elem.className;
elem.cacheClassTarget = target.className;
target.className = "code-highlighted";
elem.className = "code-highlighted";
}
}
function CodeHighlightOff(elem, id)
{
var target = document.getElementById(id);
if(elem.cacheClassElem)
elem.className = elem.cacheClassElem;
if(elem.cacheClassTarget)
target.className = elem.cacheClassTarget;
}
/*]]>*///-->
</script>
<div id="content">
<div align="left">
</div>
Also attached are my running notes on the Arc1 optics, see final
entry of these notes for some late breaking news. The prioritized
BSY diagnostics package for FY11 is also attached.<br>
Arne<br>
<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">2010-12-08
Wed 14:00</span></span> BTeam Meeting–Notes </h2>
<div class="outline-text-2" id="text-1">
</div>
<div id="outline-container-1.1" class="outline-3">
<h3 id="sec-1.1"><span class="section-number-3">1.1</span>
Optics-on-Call Report <span class="tag"><span
class="Kazimi">Kazimi</span> <span class="Hofler">Hofler</span></span></h3>
<div class="outline-text-3" id="text-1.1">
<p>No calls received. Support Injector transport after the
cessiate-bake effort on Tuesday.
150μ A setup complete with more interception than previous
setup.
</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>
Beam Studies Report </h3>
<div class="outline-text-3" id="text-1.2">
<ul>
<li id="sec-1.2.1">Summary of Heat-Activate <br>
Pockel Cell alignment did not take place. Plenty of
plenary steps,
but no alignment.
<p>
Re-thinking the requirements for this phase of the
QWeak experiment.
Would like a few days of the Winter break. EGG group
will support
this. What else do we need? </p>
<p>
Next heat-cessiate party will be during the Winter
Break.
</p>
</li>
<li id="sec-1.2.2">Parity Quality Beam Status Report <span
class="tag"><span class="Qweak">Qweak</span></span><br>
Charge asymmetry data. Short periods where the A<sub>Q</sub>
is not controlled
due to data acquisition issues. But when the feedback
loop is working
A<sub>Q</sub> is reasonably stable.
<p>
Position differences are small when the A<sub>Q</sub>
is stable. Future
position differences will be for 1h slugs of data.
Expect the
differences to be in the 10s of nm. Present position
differences
good enough for this phase of the experiment.
</p>
<p>
Present asymmetries look encouraging for the run out
through May
13<sup>th</sup>
</p>
<ul>
<li id="sec-1.2.2.1">Compton Signal <br>
Signal to background looks very good except that
there is a 20minute
rise and fall of the background. Not sure where the
background comes
from.
<p>
Speculation is that it is correlated with the QE
hole on the cathode.
</p>
</li>
<li id="sec-1.2.2.2">Things that still need to be
checked out <br>
<ul>
<li>
modulation system and hall optics properly
configure
</li>
<li>
BCM noise issue (EES involved)
</li>
<li>
Measure betatron damping via PZT
</li>
<li>
optimize FFB FF system, what are the
requirements? If the
asymmetries look ok do we really need to improve
the FFB FF system?
"I would not mess with it", says Roger Carlini.
</li>
<li>
IA feedback
</li>
<li>
0.2 Hz kick? Still present in the Injector. Hall
needs to
evaluate the impact of this and report back.
This has been a
nagging issue since PRex. </li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-1.3" class="outline-3">
<h3 id="sec-1.3"><span class="section-number-3">1.3</span>
Beam Studies Planning </h3>
<div class="outline-text-3" id="text-1.3">
<ul>
<li>
RF Recovery
</li>
<li>
High Current (180 {μ}A) Injector setup for QWeak
</li>
<li>
Mott Measurements
</li>
<li>
Arc9 Transport
</li>
</ul>
</div>
</div>
<div id="outline-container-1.4" class="outline-3">
<h3 id="sec-1.4"><span class="section-number-3">1.4</span> BSY
Diagnostics <span class="tag"><span class="Benesch">Benesch</span></span></h3>
<div class="outline-text-3" id="text-1.4">
<p>Present updated table. B-team to prioritize the list
based on
desirability and known resource limits. The outcome of
this
discussion will be the plan that is executed.
</p>
<p>
See Jay's attached list with the prioritized list.
</p>
<ul>
<li id="sec-1.4.1"><span class="todo TODO"> TODO</span>
Need to finish ItoV on the dumplettes <br>
</li>
</ul>
</div>
</div>
<div id="outline-container-1.5" class="outline-3">
<h3 id="sec-1.5"><span class="section-number-3">1.5</span>
12GeV Pathlength Requirements Status <span class="tag"><span
class="Tiefenback">Tiefenback</span></span></h3>
<div class="outline-text-3" id="text-1.5">
<p>Update on requirements table and overall documentation
preparation.
</p>
</div>
</div>
<div id="outline-container-1.6" class="outline-3">
<h3 id="sec-1.6"><span class="section-number-3">1.6</span>
ARC1 model <span class="tag"><span class="Arne">Arne</span></span></h3>
<div class="outline-text-3" id="text-1.6">
<p>Results of the latest round of Arc1 modeling. See
separate note. Recent developments have identified the
problem
with getting the Arc1 transport to be symmetric. The body
gradient
for MBE1A01 is unique when compared to the other 15dipoles
in the arc
which all have the same body gradient. This problem is in
the Art++
decks as well. See separate note for details.
</p>
<p>
The 12 GeV decks have used the MBE1A01 value for all 16
dipoles in the
Arc, whereas a better choice might be to set MBE1A01 to
the values
found for the other 15 dipoles. Waiting guidance on this….
</p>
</div>
</div>
</div>
<div id="outline-container-2" class="outline-2">
<h2 id="sec-2"><span class="section-number-2">2</span> <span
class="timestamp-wrapper"> <span class="timestamp">2010-12-01
Wed 14:00</span></span> BTeam Meeting–Notes </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>
Optics-on-Call Report: Hofler </h3>
<div class="outline-text-3" id="text-2.1">
<p>Summary of the thankful week
</p>
<p>
Fri: Hall C Compton scan – done.
</p>
<p>
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.
</p>
<p>
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.
</p>
</div>
</div>
<div id="outline-container-2.2" class="outline-3">
<h3 id="sec-2.2"><span class="section-number-3">2.2</span>
Beam Studies Report: All </h3>
<div class="outline-text-3" id="text-2.2">
<ul>
<li id="sec-2.2.1">Pathlength Analysis: Yunn <br>
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?
<p>
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).
</p>
</li>
<li id="sec-2.2.2">Arc9 model calibration test: Roblin <br>
<a
href="http://opsweb.acc.jlab.org/CSUEApps/atlis/task/10511">ATLiS
entry 10511</a>. Multiple RF FSD trips, ran fopt three
times, not
necessarily complete, requires data quality review by
Yves.
</li>
<li id="sec-2.2.3">Hall C double peak source
found/resolved? Suleiman <br>
<a
href="http://opweb.acc.jlab.org/CSUEApps/elog/entry/1555706?PHPSESSID=eba0eb97d22d5f6c7ee0b57e9c387545">See
this elog entry</a>. 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.
</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>
Beam Studies Planning: All </h3>
<div class="outline-text-3" id="text-2.3">
<ul>
<li id="sec-2.3.1">Thursday 2010-12-02 and Tuesday
2010-12-07 Plans: Suggested <br>
<ul>
<li id="sec-2.3.1.1">Tuesday 2010-12-07 <br>
CHL power switch uncertainties, injector cathode
activation (~12h).
TPE also scheduled to start operations at start of
evening shift.
</li>
<li id="sec-2.3.1.2">Compton backgrounds (hall A) <br>
</li>
<li id="sec-2.3.1.3">Injector development for Hall
C/Qweak (Dalton, Benesch), ~4h (to 12h?) <br>
<a
href="http://opsweb.acc.jlab.org/CSUEApps/atlis/task/10271">ATLiS
entry 10271</a>, Rebalance systematics, RHWP
scans/PC translation scans.
Was done before but with IHWP in wrong orientation.
Oops! May require
some time both days.
<p>
Estimate 4h Thu 12-02, 8h Tue 12-07 (laser table
in conjunction with
Cathode activation, total time 12h)
</p>
</li>
<li id="sec-2.3.1.4">One pass stripline BPM test, ~1h
<br>
<a
href="http://opsweb.acc.jlab.org/CSUEApps/atlis/task/10445">ATLiS
entry 10445</a>, Large dynamic range of currents
(100uA to >=100 nA CW)
for BPM linearity test. Access required, not time
critical; can wait
for next access.
</li>
<li id="sec-2.3.1.5">Repeat of Arc9 model calibration
test?, ~2h <br>
<a
href="http://opsweb.acc.jlab.org/CSUEApps/atlis/task/10511">ATLiS
entry 10511,</a> should wait for Yves evaluation
of existing data to see
if its enough for his analysis.
</li>
<li id="sec-2.3.1.6">Cryomodule JT valve test?, ~10h <br>
<a
href="http://opsweb.acc.jlab.org/CSUEApps/atlis/task/7874">ATLiS
entry 7874</a>, Has been lingering since June.
Requires beam off.
Also requires Jonathan Creel's availability.
</li>
</ul>
</li>
<li id="sec-2.3.2">Thursday 2010-12-02 Plans: Decided <br>
<ul>
<li id="sec-2.3.2.1">Move spot (0.5h) <br>
</li>
<li id="sec-2.3.2.2">Injector development for QWeak
(4h) <br>
</li>
<li id="sec-2.3.2.3">Compton background tuning
(0.5-1h) <br>
</li>
</ul>
</li>
<li id="sec-2.3.3">Tuesday 2010-12-07 Plans: Decided <br>
<ul>
<li id="sec-2.3.3.1">Injector development for QWeak,
laser table, cathode activation (8-12h) <br>
</li>
</ul>
</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>
FY11 BTeam Projects </h3>
<div class="outline-text-3" id="text-2.4">
<ul>
<li id="sec-2.4.1">BSY Diagnostics: Benesch <br>
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.
<ul>
<li id="sec-2.4.1.1"><span class="todo TODO"> TODO</span>
ATLiS to test optics measurements at 1E03/2S10
(before Jan 2011 optics) <br>
</li>
<li id="sec-2.4.1.2"><span class="todo TODO"> TODO</span>
Work up detailed tabular strawman, cost/resource
estimates (Benesch) <br>
</li>
<li id="sec-2.4.1.3"><span class="todo TODO"> TODO</span>
Cross-check injector harp optics match measurement
consistency <br>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-2.5" class="outline-3">
<h3 id="sec-2.5"><span class="section-number-3">2.5</span>
Anything else? </h3>
<div class="outline-text-3" id="text-2.5">
<ul>
<li id="sec-2.5.1">Optics: Hofler, Kazimi <br>
</li>
</ul>
</div>
</div>
</div>
<div id="postamble">
<p class="date"> Date: 2010-12-13 15:37:41 EST</p>
<p class="creator">HTML generated by org-mode 6.33x in emacs 23</p>
</div>
</div>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<br>
<pre class="moz-signature" cols="72">--
Director of Accelerator Operations
Jefferson Lab Office: (757) 269-6268
12000 Jefferson Avenue Cell: (757) 876-6289
Newport News, VA 23606 Email: <a class="moz-txt-link-abbreviated" href="mailto:freyberg@jlab.org">freyberg@jlab.org</a>
</pre>
</body>
</html>