GlueX Offline Meeting, June 25, 2014

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GlueX Offline Software Meeting
Wednesday, June 25, 2014
1:30 pm EDT
JLab: CEBAF Center F326/327


  1. Announcements
    1. CCDB 1.02
  2. Review of minutes from the last meeting (all)
  3. BCAL Timing (all)
  4. Data Challenge 3 (all)

Communication Information

  1. To join via Polycom room system go to the IP Address: ( and enter the meeting ID: 292649009.
  2. To join via a Web Browser, go to the page
  3. To join via phone, use one of the following numbers and the Conference ID: 292649009
    • US or Canada: +1 408 740 7256 or
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Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2014-2Q on the JLab CUE. This directory is accessible from the web at .



  • CMU: Will Levine, Paul Mattione
  • JLab: Mark Ito (chair), David Lawrence, Simon Taylor, Beni Zihlmann
  • IU: Kei Moriya
  • NU: Sean Dobbs
  • UConn: Richard Jones, Brendan Pratt[?]


  • Mark mentioned that CCDB 1.02 will be released soon. Sean explained that it fixes a bug that appears when using a non-default variation.
  • Mark also mentioned that we need a new tagged release soon.
  • We discussed whether EVIO should be made a mandatory part of the build. Most people that that that would only add unnecessary complication at this point. We should be prepared to include it in builds at JLab in the near future.

Review of Minutes from the Last Meeting

We skimmed the minutes from June 11.

  • Mark will start copying data challenge 2 data from Northwestern when the servers come back up.
  • David told us that as soon and the TOF group can obtain data using the CAEN TDCs he can test that aspect of reading EVIO data into JANA. Beni mentioned that he has already sent David some F1-TDC data and so that can be tested as well.

BCAL Timing

Will gave us an update. He showed a couple of plots showing a comparison of the late-time tail for positive vs. negative pions and the timing tail for protons. These studies were at least partially motivated by Richard's hypothesis that the tail could be a result of metastable states produced from stopped pions.

We spent some time re-studying the hdgeant event he sent to the email list some weeks ago. Will will package a few similar events and send them to Richard so he can look more carefully at the physics treatment of the stopped pion.

Data Challenge 3

We discussed possible goals for the data challenge:

  • process fake raw data resident in the tape library
  • render the data in EVIO format
  • perform more efficient generation of the electromagnetic background
  • use the Geant4 version of HDGeant
  • incorporate new code for obtaining constants from the CCDB

Richard thought that the mixing of E&M background should happen at the simulation stage. He outlined how he thought that should go: pick out the appropriate binary tree from a background event and insert it into the event of interest, then let the normal hit-making mechanism proceed. We would need to find someone to work on this; Richard does not have time right now.

Paul pointed out that if all we interested in is testing tape access, then many of the other goals could be deferred.

We discussed schedule. If we schedule it after the summer, the time is already short and David pointed out that there will be a manpower-availability conflict with the commissioning run. If we wait until early next year, we may not learn much beyond what real raw data will teach us.

With all that in mind, we thought that a data challenge with scaled down goals for mid-August sounded like a reasonable approach.

[Added in press:] Curtis thinks that the tape-resident data and EVIO format should be included. He also pointed out that this will be a chance to exercise JANA multi-threading. He agreed that a mid-August timeframe was reasonable.

Action Items

  1. Make a new tagged release. -> Mark
  2. Add EVIO to JLab builds as an option -> Mark
  3. Assign EM background generation problem to someone. -> Mark