GlueX Offline Meeting, April 29, 2015

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GlueX Offline Software Meeting
Wednesday, April 15, 2015
1:30 pm EDT
JLab: CEBAF Center F326/327


  1. Announcements
    1. Nightly build results on web (Mark)
    2. HDGeant now uses RF period in CCDB
  2. Review of minutes from April 15 (all)
  3. Offline Monitoring (Kei)
  4. Spring 2015 Commissioning Simulations (Sean)
  5. Action Item Review

Communication Information

Remote Connection


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2015 on the JLab CUE. This directory is accessible from the web at .



  • CMU: Curtis Meyer
  • FSU: Aristeidis Tsaris
  • JLab: Mark Ito (chair), David Lawrence, Paul Mattione, Kei Moriya, Nathan Sparks, Justin Stevens, Simon Taylor
  • NU: Sean Dobbs


  • Nightly build results on web. Mark has put the summary of nightly build errors and warnings on the web. He led us through the email announcing it.
  • HDGeant now uses RF period in CCDB. Richard Jones checked in a change such that HDGeant will look up the bunch frequency from the CCDB when simulating electromagnetic background. The current setting in the database is 499 MHz.

Review of minutes from April 15

We went over the minutes from last time.

David gave us an update on his Geant4 implementation. He as put in the FDC and FCAL and can reconstruct tracks in the FDC with resolution comparable with those found with HDGeant. He ran into an issue with multi-threading; a bug report has been submitted to the Geant4 Collaboration.

Offline Monitoring

Kei reported he has run over most of the files collected in the last week of data-taking. The volume of data is small, it only takes a few hours to run over everything.

We then discussed doing a final run over the Fall data so that people can use the data to prepare for the collaboration meeting. There is a change to get the setting of the F1-TDC parameters from the CCDB that Justin checked in yesterday. There are also new TOF timing constants that we are not taking advantage of yet. In addition Lubomir also has new FDC alignment numbers. For all of these reasons a re-run seems desirable but time is running short to have the data available in time to be useful. We agreed on a launch time target at the end of the day on Friday.

There was a bit of discussion of what data we have from the current run. Most of it is in run 2931, which is contained in just over 100 files and has about 75 million events. Data were taken in mode 7 with an FCAL-BCAL trigger.

Spring 2015 Commissioning Simulations

Sean described the conditions he is proposing and solicited feedback. The software has been tagged but not released. Paul noted that the nominal position of the coherent peak is 3.4 GeV. The gxproj4 account will be used to run the jobs.

On a side note, Mark has put in a request to the Computer Center for a gxproj5 account.