GlueX Offline Meeting, April 18, 2012

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GlueX Offline Software Meeting
Wednesday, April 18, 2012
1:30 pm EDT
JLab: CEBAF Center, F326/327

Agenda

  1. Announcements
    1. EVIO version 4
    2. std::shared_ptr<>() and new C++ standard
  2. Review of minutes from the last meeting: all
  3. Reconstruction sub-group reports
    1. Calorimeters
    2. Tracking
      1. Tracking/FDC Segment code changed to read target z-position and length from XML geometry (before: z-position was hard-coded to 65.0 cm)
      2. CDC Candidate factory: no longer produces spurious matches between axial layers 1 and 5 when there are no matching hits in layer 3
    3. PID
  4. Offline Software Review Planning
  5. Action Item Review
  6. Review of recent repository activity: all

Communication Information

Video Conferencing

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-2Q/ .

Minutes

Present:

  • CMU: Will Levine, Paul Mattione
  • IU: Ryan, Mitchell, Kei Moriya, Matt Shepherd
  • JLab: Mark Ito (chair), David Lawrence, Irina Semonova, Simon Taylor, Elliott Wolin

Announcements

  • EVIO version 4 is out: Elliott

This version has a unified interface to files, buffers, and sockets. The details of the implementation are hidden. Dictionaries have been added.

  • The new C++ standard and shared pointers: Elliott

A new version of the C++ standard has been released. It is not commonly included in OS distributions yet. The currently available compilers have special namespaces for auxilliary packages like boost and TRL. Much of that functionality is part of the new standard. We are not ready to switch yet, but this is coming down the pike. Elliott is especially interested in the use of shared pointers, which implement a form of garbage collection.

Review of minutes from the last meeting

We reviewed the minutes from the April 4th meeting.

  • Sascha Somov had an issue with the new rad-hard-free FCAL that is in the simulation. He was using and old version of the code with new calibration constants with non-optimal results. Mark created an older version of the calibration constants for his use.
  • Simon fixed a problem where not all of the energy deposited in the TOF was added into the hit energy. This was causing spurious inefficiency in the TOF.

Reconstruction sub-group reports

Calorimeters

Will reminded us about discussion about the minimum number of blocks needed to form an FCAL cluster. Richard had suggested a change in the threshold for blocks next to the seed block and Will wants to explore the effect of that approach. We decided that in the mean time we would go ahead and implement a 1-block minimum as a default rather than 2. This will be changeable at run time with a JANA parameter. calorimeters physcis meeting, minimum blocks needed for form cluster make the default 1 change not made yet richard suggested threshold change

one cluster hits with loose timing cut Will will implement

bcal meeting last week irina and andre, discussion on how to incorporate sampling fluctuations into simulation more discussion single block, not layers

tracking

fdc segment code changed ot get target z position and lentgh from xml

matt tells reason for 65 was prevent

busy events cdc track candidate purious matches between layers 1 and 5 with nothing in 3

paul working on spiraling pions, going well, code running, doing tests, problem cases dealing with them

add a dpi+ and dpi- factory for each of those for convenience

committee has been named, chair no charge yet data acquisition added mcbride, mchaus, marchand, perske with another from babar and/or cleo discussions with chair understood how much work it takes to utilitze grid need to have numbers outlines of slides have been done intro curtis, cpu requirements, mark parallel, with hall b for two hours, 40 minutes of slides anyway, another meeting next week with rolf june 7 & 8 outline of document for TDR/hand-out