[Halld-offline] Offline Software Meeting Minutes, April 15, 2015

[Mark Ito]

Folks,

Please find the minutes below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_15,_2015#Minutes

   -- Mark
__________________________________________________________


GlueX Offline Meeting, April 15, 2015
Minutes

Present:

  * *JLab*: 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
  * *MEPhI*: Dmitry Romanov


Announcements

 1. *RUNNO FFREAD card in HDGEANT*. 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.
 2. *F1TDC Timing, CCDB*. Paul led us through his email
    <https://mailman.jlab.org/pipermail/halld-offline/2015-April/002003.html>.
    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.
 3. *CAEN TDC time scale*. Mark circulated an email
    <https://mailman.jlab.org/pipermail/halld-offline/2015-April/002005.html>
    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.


Collaboration Meeting

We put together a tentative agenda:

 1. Overview, Mark, 30 min.
 2. Calibration, Sean, 45 min.
 3. Timing Calibration, Mike, 15 min.
 4. Offline Monitoring, Kei, 30 min.


Review of minutes from April 1

We went over the minutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_1,_2015#Minutes>. 


The b1pi and single-track tests are running successfully now.

Offline Monitoring

Kei showed slides 
<https://halldweb.jlab.org/wiki/images/6/69/2015-04-15-offline_monitoring.pdf> 
summarizing recent improvements to the offline monitoring system. We 
also went over some of the pages in his collection of launch statistics 
<https://halldweb.jlab.org/data_monitoring/launch_analysis/index.html>. 
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.

EM background simulation

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.

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.
Sean volunteered to start playing around with David's event combination 
system.

Geant4

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.

Retrieved from 
"https://halldweb.jlab.org/wiki/index.php?title=GlueX_Offline_Meeting,_April_15,_2015&oldid=66217"

  * This page was last modified on 15 April 2015, at 20:21.

-- Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295
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