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Folks,<br>
<br>
Find the minutes below and at
<a class="moz-txt-link-freetext" href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_September_17,_2014#Minutes">https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_September_17,_2014#Minutes</a>
.<br>
<p> -- Mark<br>
__________________________________________________________________<br>
</p>
<h1><span class="mw-headline" id="Minutes">Minutes</span></h1>
<p>Present (compiled from the secretary's memory; omissions likely,
please add yourself if you were omitted):
</p>
<ul>
<li> <b>CMU</b>: Paul Mattione, Curtis Meyer
</li>
<li> <b>JLab</b>: Mark Ito (chair), David Lawrence, Kei Moriya,
Simon Taylor
</li>
<li> <b>IU</b>: Matt Shepherd
</li>
<li> <b>NU</b>: Sean Dobbs
</li>
<li> <b>UConn</b>: Richard Jones
</li>
</ul>
<h2> <span class="mw-headline" id="Announcements">Announcements</span></h2>
<ul>
<li> <b>CCDB 1.03 released</b> David put in a fix to avoid
conflicts in database access for </li>
</ul>
<p>multi-threaded jobs. See the <a
href="https://mailman.jlab.org/pipermail/halld-offline/2014-September/001799.html"
class="external text" rel="nofollow">email</a> announcing the
release for links to more details.
</p>
<ul>
<li> <b>Nightly Build Versions</b> The nightly build is now using
CCDB 1.03 and JANA 0.7.2.
</li>
</ul>
<h2> <span class="mw-headline" id="Collaboration_Meeting">Collaboration
Meeting</span></h2>
<p>We reviewed the agenda Mark posted on the <a
href="https://halldweb1.jlab.org/wiki/index.php/GlueX-Collaboration-Oct-2014"
title="GlueX-Collaboration-Oct-2014">collaboration meeting page</a>.
It looks like this:
</p>
<ul>
<li> 16:05 Session IVb (120) --- Offline - (Organizer: Mark Ito) -
Chair:
<ul>
<li> 16:05 (25) --- Overview - Mark
</li>
<li> 16:30 (25) --- Tracking - Simon
</li>
<li> 16:55 (15) --- BCAL Calibrations - Will McGinley
</li>
<li> 17:10 (25) --- Commissioning Simulations - Sean
</li>
<li> 17:35 (25) --- Offline Analysis During Run - Paul
</li>
</ul>
</li>
</ul>
<ul>
<li> Curtis suggested the addition of the BCAL calibration talk
from Will McG.
</li>
<li> Matt noted that Ryan will give a talk on his multi-pion
analysis in the physics session.
</li>
</ul>
<p>[Added in press: at Zisis's suggestion we will add a talk on BDTs
and BCAL reconstruction.]
</p>
<h2> <span class="mw-headline"
id="Review_of_Minutes_from_September_3">Review of Minutes from
September 3</span></h2>
<p>We looked at the <a
href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_September_3,_2014#Minutes"
title="GlueX Offline Meeting, September 3, 2014">minutes of the
last meeting</a>.
</p>
<h3> <span class="mw-headline"
id="Realistic_Tagger_Timing_Ambiguity">Realistic Tagger Timing
Ambiguity</span></h3>
<ul>
<li> The trunk seems to be working after the merge of Richard's
tagger timing development branch.
<ul>
<li> Paul reported that the Analysis Library is now working
with the ambiguity in the chosen tagger hit. It picks the
correct hit 95% of the time [at a beam rate of ?].
</li>
</ul>
</li>
<li> Richard reported that mcsmear has been updated to smear
tagger hit timing.
</li>
<li> Paul explained the method for picking the RF bucket. There
are two levels:
<ol>
<li> <b>Event-level pick</b>: based on start counter times.
</li>
<li> <b>Combo-level pick</b>: based on propagating (a) TOF
and BCAL times for charged tracks and (b) photon shower
times back to the vertex. Note that within a single event,
this pick may vary from combo to combo.
</li>
</ol>
<ul>
<li> Level (1) is useful for diagnostics. Within the context
of an analysis using the Analysis Library, level (2) is the
only one that counts.
</li>
</ul>
</li>
</ul>
<h3> <span class="mw-headline"
id="Comparing_Results_between_HDDM_and_EVIO_Data_Formats">Comparing
Results between HDDM and EVIO Data Formats</span></h3>
<p>Sean had further comments.
</p>
<ul>
<li> The doubling of wire-based track multiplicity from EVIO
compared to HDDM has been traced to a rounding error in the
Flash-125 emulation. A fix had not been implemented yet.
<ul>
<li> Richard had noted this effect in his debugging of the
tagger-timing branch. Of the many such discrepancies he had
to address, this one was left for the FADC experts.
<ul>
<li> Sean noted that of the many discrepancies addressed
by Richard, he had independently addressed many of them.
He is pleased that they have been resolved on the
current trunk.
</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2> <span class="mw-headline" id="Commissioning_Simulations">Commissioning
Simulations</span></h2>
<h3> <span class="mw-headline" id="Detector_Simulations">Detector
Simulations</span></h3>
<p>Simon has checked in the commissioning target geometry. He has
also updated other beamline elements as well as correcting the
start counter geometry. None of the elements have been changed in
a way that modify hits. Richard has also been working on the pair
spectrometer.
</p>
<p>We are very close to being a position to start large-scale
simulations.
</p>
<h3> <span class="mw-headline" id="Tagger_Hall_Simulations">Tagger
Hall Simulations</span></h3>
<p>Richard made an appeal for manpower to help run tagger Hall
simulation. We decided that when setting up the detector
simulation run we would try to set up the tagger hall simulation
at the same time. Other folks could then be called in to baby sit
the jobs.
</p>
<h3> <span class="mw-headline" id="Documentation">Documentation</span></h3>
<ul>
<li> Sean has made a web page for the detector simulation
conditions. Mark will post it on the web.
</li>
<li> Richard has made a <a
href="https://halldweb1.jlab.org/wiki/index.php/Fall_2014_Commissioning_Simulations"
title="Fall 2014 Commissioning Simulations">wiki page for the
tagger hall</a> simulation conditions.
<ul>
<li> Richard has described the <a
href="https://halldweb1.jlab.org/wiki/index.php/Beam_Simulations"
title="Beam Simulations">tagger simulation mechanics</a>
in more detail on the wiki.
</li>
</ul>
</li>
</ul>
<h2> <span class="mw-headline" id="DC3">DC3</span></h2>
<p>With all of the activity centered around the commissioning run,
Mark was skeptical if he and others have the time to fully launch
Data Challenge 3 at this time. Its start will likely be delayed a
month or so.
</p>
<h2> <span class="mw-headline"
id="Offline_Analysis_of_Online_Data_and_Coordination_Thereof">Offline
Analysis of Online Data and Coordination Thereof</span></h2>
<p>Paul has volunteered to organize this effort.
</p>
<p>The template for the effort is the [<a
href="https://hdops.jlab.org/wiki/index.php/Offline_Analysis_Commissioning"
class="external text" rel="nofollow">list of commissioning items</a>]
Curtis put together some time ago.
</p>
<p>Kei has volunteered to help with the effort as well. In
particular he is interested in picking a few specific channels and
doing the standard analysis on them.
</p>
<p>Matt asked for guidance on how to get a file of Pythia events in
EVIO format. David has a <a
href="https://halldweb1.jlab.org/wiki/index.php/HOWTO_convert_MC_data_to_EVIO_and_replay_it"
title="HOWTO convert MC data to EVIO and replay it">wiki page
with instructions</a> and Richard has written <a
href="https://mailman.jlab.org/pipermail/halld-offline/2014-September/001805.html"
class="external text" rel="nofollow">scripts</a> that do exactly
this.
</p>
<p>Paul will look at the overall issue and gather volunteers.
</p>
<h2> <span class="mw-headline" id="Monitoring_Histograms">Monitoring
Histograms</span></h2>
<p>David and Sean will work on documenting the process for
implementing online monitoring histograms. These are done with
plugins and use ROOTSpy to collect statistics from multiple nodes.
Elliott Wolin started this effort, but it there have been changes
in recent weeks. Sean also has done some development on the
ROOTSpy package, as has David.
</p>
<h2> <span class="mw-headline"
id="100_ns_Shift_Issue:_an_effective_time_cut">100 ns Shift
Issue: an effective time cut</span></h2>
<p>The 100 ns introduced was to give positive TDC times. A side
effect is that times earlier than 0, after shifting, are dropped
from the data stream. The "right" thing to do may be detector
dependent. Richard pointed this out and suggested that this offset
be separate for each detector system. Sean had already largely
implemented this idea, putting the constants into the calibration
database. The scheme depends on simulated EVIO data using "mc"
variation, so that the shift introduced in conversion to EVIO from
HDDM can be reversed. Of course the EVIO conversion program should
use the same set of constants to apply the shift in the first
place. Sean will complete the implementation along these lines.
</p>
<h2> <span class="mw-headline" id="Action_Items">Action Items</span></h2>
<ul>
<li> Reconcile understanding of pair spectrometer geometry
changes. (Simon, Richard)
</li>
<li> Update the documentation on how to implement monitoring
histograms. (David, Sean)
</li>
<li> Implement subsystem dependent time offsets for making TDC
values positive all positive integers.
</li>
</ul>
<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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