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Folks,<br>
<br>
Please find the minutes below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_November_12,_2014">https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_November_12,_2014</a>
.<br>
<br>
-- Mark<br>
______________________________________________________________<br>
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GlueX Offline Meeting, November 12, 2014<br>
<div id="bodyContent"><span class="mw-headline" id="Minutes">Minutes</span><br>
<br>
Present:
<br>
<ul>
<li> <b>CMU</b>: Curtis Meyer
</li>
<li> <b>FSU</b>: Aristeidis Tsaris
</li>
<li> <b>IU</b>: Matt Shepherd
</li>
<li> <b>JLab</b>: Alex Barnes, Mark Ito (chair), David
Lawrence, Paul Mattione, Kei Moriya, Eric Pooser, Mike
Staib, Simon Taylor
</li>
<li> <b>NU</b>: Sean Dobbs
</li>
<li> <b>ODU</b>: Moskov Amaryan
</li>
</ul>
<br>
<span class="mw-headline" id="Light_Meson_Decays_in_CLAS">Light
Meson Decays in CLAS</span><br>
<br>
Moskov presented a list of topics that could be addressed
with GlueX along with an impressive set of plots that show
the signals seen in the CLAS detector. See <a
href="https://halldweb1.jlab.org/talks/2014-4Q/Amaryan_GLUEX.pdf"
class="external text" rel="nofollow">his slides</a> for
details. You can also view a <a
href="https://halldweb1.jlab.org/talks/2014-4Q/Amaryan_Light_Mesons.mpeg"
class="external text" rel="nofollow">video of his talk</a>.
<br>
<br>
<span class="mw-headline" id="Commissioning_Simulations">Commissioning
Simulations</span><br>
<br>
Sean made several points:
<br>
<ul>
<li> Rate estimates were presented at the last calibration
meeting.
</li>
<li> With inconsistent beam it is hard to make comparisons
with what we are seeing.
</li>
<li> Simon will look into moving the start counter around
to see if the known tilt is responsible for the up/down
asymmetry in rates.
</li>
<li> We discussed issues around putting in known effects
due to non-ideal geometry both in simulation and in
reconstruction. There are a lot of issues on how to
handle it; different solutions may be appropriate for
different types of non-idealism. For the start counter
rates you need the geometry changed in HDDS. For small
displacements in relative detector positions, it may be
enough to put it into the reconstruction and ignore it
in Monte Carlo. Matt wondered whether the different
pieces of the detector could be assembled with
parameters to match the as-built geometry.
</li>
<li> The code is ready to go, but we will wait a few days
before proceeding. The geometry may be changing rapidly
over the next few days and we need to let that settle
down.
</li>
<li> Energy threshold is a big driver of simulated rates,
but we have incomplete information on what those
thresholds are.
</li>
</ul>
<br>
<span class="mw-headline" id="Offline_Data_Monitoring">Offline
Data Monitoring</span><br>
<br>
Paul let the discussion.
<br>
<ul>
<li> The online monitoring is not working at the moment,
but Kei has been running the online monitoring offline
and results are available on the monitoring website.
</li>
<li> Matt asked about re-running monitoring analysis on
old data with improved code as it comes out. We settled
on doing a re-run of the entire data set once a week.
The amount of data so far is small enough that that is
not a problem.
</li>
<li> Justin asked for feedback on the plots and time-lines
available on the site. If there are things missing or
requests for new items, please let him know.
</li>
<li> Kei showed <a
href="https://halldweb1.jlab.org/wiki/images/2/20/2014-11-12-timing.pdf"
class="internal" title="2014-11-12-timing.pdf">some
results</a> of the monitoring histograms he has been
producing as well as a few plots on analysis he has done
on his own. In particular he showed a nice correlation
between start counter times and FCAL times as measured
with the FADCs. He sees a time difference distribution
with a 2.6 ns sigma. Unfortunately we ran out of time
and were not able to look at all of his slides, so those
interested should take a look at the link given just
above.
</li>
</ul>
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<pre class="moz-signature" cols="72">--
Mark M. Ito, Jefferson Lab, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
</pre>
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