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Folks,<br>
<br>
Please find the minutes below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_15,_2015#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_15,_2015#Minutes</a><br>
<br>
-- Mark<br>
__________________________________________________________<br>
<br>
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<span dir="auto">GlueX Offline Meeting, April 15, 2015</span><br>
<div id="bodyContent" class="mw-body-content"><span
class="mw-headline" id="Minutes">Minutes</span><br>
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<br>
Present:
<br>
<ul>
<li> <b>JLab</b>: Alex Barnes, Sean Dobbs, Mark Ito
(chair), David Lawrence, Paul Mattione, Kei Moriya,
Eric Pooser, Nathan Sparks, Mike Staib, Justin
Stevens, Simon Taylor, Beni Zihlmann</li>
<li> <b>MEPhI</b>: Dmitry Romanov</li>
</ul>
<br>
<span class="mw-headline" id="Announcements">Announcements</span><br>
<ol>
<li> <b>RUNNO FFREAD card in HDGEANT</b>. Mark
introduced a new FFREAD card for HDGEANT. If the new
RUNNO card gives a non-negative value, it will use
that value to initialize the calibration database and
initialize the run number. Run numbers encoded in HDDM
events will overwrite this run number. The motivation
was to have particle gun events will use this value;
before now getting the correct calibration constants
was a problem. David suggested having this card
overwrite the value in the HDDM file.</li>
<li> <b>F1TDC Timing, CCDB</b>. Paul led us through <a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2015-April/002003.html">his
email</a>. F1-TDCs are now referenced to the TI
counter rather than the measured trigger time. On
another front, he has changed the RF constants tables
in the CCDB. Old SQLite files are invalidated with
this change.</li>
<li> <b>CAEN TDC time scale</b>. Mark circulated an <a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2015-April/002005.html">email</a>
from Ben Raydo making explicit the method for
calculating the size of the time bin for the CAEN 1290
TDCs we use for the TOF. Last week Paul discovered
that using 25 ps per bin gives the wrong separation of
the RF pulses going into the CAENs. Turns out that
23.4375 ps is the right number.</li>
</ol>
<br>
<span class="mw-headline" id="Collaboration_Meeting">Collaboration
Meeting</span><br>
<br>
We put together a tentative agenda:
<br>
<ol>
<li> Overview, Mark, 30 min.</li>
<li> Calibration, Sean, 45 min.</li>
<li> Timing Calibration, Mike, 15 min.</li>
<li> Offline Monitoring, Kei, 30 min.</li>
</ol>
<br>
<span class="mw-headline"
id="Review_of_minutes_from_April_1">Review of minutes
from April 1</span><br>
<br>
We went over the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_1,_2015#Minutes"
title="GlueX Offline Meeting, April 1, 2015">minutes</a>.
<br>
<br>
The b1pi and single-track tests are running successfully
now.
<br>
<br>
<span class="mw-headline" id="Offline_Monitoring">Offline
Monitoring</span><br>
<br>
Kei showed <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki/images/6/69/2015-04-15-offline_monitoring.pdf">slides</a>
summarizing recent improvements to the offline monitoring
system. We also went over some of the pages in his <a
rel="nofollow" class="external text"
href="https://halldweb.jlab.org/data_monitoring/launch_analysis/index.html">collection
of launch statistics</a>. Included in his slides were
new comparisons of key job performance characteristics,
launch-to-launch, such as CPU time and memory use. Launch
13 is underway now. See his slides for the details.
<br>
<br>
<span class="mw-headline" id="EM_background_simulation">EM
background simulation</span><br>
<br>
David described his system for combining hits from two
event HDDM event streams. The streams need not have equal
numbers of events. The short stream is recycled to provide
events to combine with each event of the long stream. This
provides a mechanism for mixing a small sample of
electromagnetic background events with a sample of
simulated physics events.
<br>
<br>
Justin asked if there was a way to combine EVIO-formatted
events with HDDM events. That we we could use random
triggers from GlueX to provide the electromagnetic
background. There is not a mechanism at present, but Paul
thought it would be straightforward to convert EVIO data
to HDDM.
<br>
Sean volunteered to start playing around with David's
event combination system.
<br>
<br>
<span class="mw-headline" id="Geant4">Geant4</span><br>
<br>
David has been working on a Geant4 implementation of a
GlueX simulation in the context of the charged pion
polarization experiment. He hopes to be done in a week or
two.<br>
<br>
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<li id="lastmod"> This page was last modified on 15 April
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-- Mark M. Ito, Jefferson Lab, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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