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...and Sean Dobbs was there too!<br>
<br>
<div class="moz-cite-prefix">On 03/24/2016 12:22 PM, Mark Ito wrote:<br>
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<blockquote cite="mid:56F41442.6090608@jlab.org" type="cite">
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Folks,<br>
<br>
Please find the meeting minutes below and at <a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://tinyurl.com/hr5s9ym"><a class="moz-txt-link-freetext" href="http://tinyurl.com/hr5s9ym">http://tinyurl.com/hr5s9ym</a></a>
.<br>
<br>
-- Mark<br>
____________________________________________<br>
<br>
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<h1 id="firstHeading" class="firstHeading" style="font-weight:
bold;" lang="en"><span dir="auto">GlueX Start Counter
Meeting, March 24, 2016, </span><span class="mw-headline"
id="Minutes">Minutes</span></h1>
<div id="bodyContent" class="mw-body-content">
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">The meeting came to order at 10:00
am.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Present:</p>
<ul style="list-style-type: square;">
<li><b>FIU</b>: Mahmoud Kamel, Eric Pooser</li>
<li><b>JLab</b>: Mark Ito (chair), Simon Taylor, Beni
Zihlmann</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Announcements">Announcements</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Beam delivery to Hall D is
scheduled for Sunday, March 27.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="Review_minutes_from_the_last_meeting">Review<span
class="Apple-converted-space"> </span><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_January_28,_2016#Minutes"
title="GlueX Start Counter Meeting, January 28,
2016" style="color: rgb(85, 34, 0); padding: 0px
!important; text-decoration: underline; background:
transparent;">minutes from the last meeting</a></span></h3>
<ul style="list-style-type: square;">
<li>No progress on the NIM paper or the TDR since the
last meeting.</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Calibration_Update">Calibration
Update</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mahmoud gave an update on time
propagation delay calibration focusing on a comparison
between data and simulation. See<span
class="Apple-converted-space"> </span><a
moz-do-not-send="true" rel="nofollow" class="external
text"
href="http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2980"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">his slides</a><span
class="Apple-converted-space"> </span>for the plots
and details.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">He showed the results of the
calibration for each section of the start counter for a
sample of recent data (run 10496) and the sim1 simulated
data. Differences are seen mainly in the nose section,
where fits do not represent the data very well.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">The overall timing resolution is
270 ps for data, but 370 ps for simulation. To start
with for simulation, there is 300 ps of smearing
introduced by mcsmear but the reason for poorer
resolution than that is unclear. Mahmoud may try to go
back to a simpler propagation delay scheme that uses a
constant velocity rather than the section dependent
velocity (straight/bend/nose) that is the current
default.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Resolutions_in_mcsmear"><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/Mcsmear_20160323#SC_Resolutions"
title="Mcsmear 20160323" style="color: rgb(85, 34,
0); padding: 0px !important; text-decoration:
underline; background: transparent;">Resolutions in
mcsmear</a></span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Sean showed monitoring plots again
comparing data and Monte Carlo. He has collected a few
interesting plots for other subsystems as well. The
start counter section shows a large number of RF-bucket
mis-identifications for simulation in the plots from
which resolution numbers are extracted. The reasons are
not clear; RF bucket selection for the data looks clean.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="mcsmear_parameters"><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/Mcsmear_updates#START_COUNTER"
title="Mcsmear updates" style="color: rgb(85, 34,
0); padding: 0px !important; text-decoration:
underline; background: transparent;">mcsmear
parameters</a></span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We discussed the parameters used by
mcsmear to introduce detector effects to the start
counter hits. The first line in the table is the 300 ps
mentioned in the discussion of Mahmoud's slides (above).
Sean proposed using the measured values of the
resolution as recorded in the CCDB to do time smearing
with a channel-dependent width.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We discussed how the other
parameters should be measured and indeed whether these
are the best set of parameters to use. Mark and Simon
will make a proposal on how the various effects should
be parametrized and how those parameters should be
measured. They will report back to the group at a future
meeting.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Multiple_ADC_hits_checks">Multiple
ADC hits checks</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Sean reminded us that now were are
running with npeaks = 3 in the FADC-250s and there is a
need to study the matching of ADC and TDC hits with this
new scheme.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Efficiency_measurement">Efficiency
measurement</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Paul Mattione had commented on
Mahmoud's presentation of start counter efficiency at
the<span class="Apple-converted-space"> </span><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/March_9,_2016_Calibration#Minutes"
title="March 9, 2016 Calibration" style="color:
rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">Calibration
Meeting</a>. There appears to have been some
skepticism expressed due to the use of protons to
measure efficiency. Mahmoud pointed out the he gets the
same results independent of the particle species. We
agreed to circulate Paul's points and Mahmoud's response
and discuss the issues at the next meeting.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Run_Issues">Run Issues</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">There was one round of pedestal
adjustment for the FADCs early in the run by Eric and
Sergey Furletov. Nothing has been done since. Beni
advocates doing another round before we start running
again, and not just for the start counter.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">The meeting adjourned at 11:05 am.</p>
</div>
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style="color: rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">https://halldweb.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_March_24,_2016&oldid=73947</a>"</div>
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<li id="lastmod">This page was last modified on 24 March 2016,
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<pre class="moz-signature" cols="72">--
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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