[Halld-offline] Offline Software Meeting MInutes, May 28, 2014

[Mark M. Ito]

People,

Please find the minutes below and at

https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_May_28,_2014#Minutes 
.

   -- Mark
____________________________________________

GlueX Offline Meeting, May 28, 2014
Minutes

    Present:
      * CMU: Will Levine, Paul Mattione, Curtis Meyer
      * FSU: Aristeidis Tsaris
      * IU: Kei Moriya
      * JLab: Mark Ito (chair), David Lawrence, Mike Staib, Simon Taylor,
        Beni Zihlmann
      * MIT: Justin Stevens
      * NU: Sean Dobbs

Announcements

    Mark announced that he has copied 460,000 files from UConn using the
    OSG SRM. That is about 90% of the total file count. They are all being
    archived to the tape library. Files from Northwestern will be copied
    next.

New Field Maps

    We noted David's work producing [24]new field maps for the studies of
    the impact of various magnetic field settings. People have been using
    them without incident.

    Justin asked about using the old maps with a new version of the CCDB
    database. Mark mentioned that there is a timestamp feature to insure
    constants from a fixed point in the past. Mark will point the group to
    documentation.

Updates to Analysis Library and Scripts

    Paul led us through [25]his email describing "some bug fixes and some
    improvements."

BCAL Timing Update

    Will presented [26]extensions to the work he presented at the last
    meeting. He recommends that we calculate and save two times, one
    appropriate for photons and another appropriate for hadrons, the latter
    using only the earliest half of hits in the BCAL.

    Mark suggested that we try to determine the physical cause of the late
    tails in the timing distribution before implementing these kinds of
    changes. Will has already looked at the Monte Carlo for the source; he
    will send out email on what he has discovered thus far.

Event Skimming

    Sean has the backend database code for EventStore all done. He is
    working on a plug-in to read in events.

Changes to CCDB

Version Checking

    David asked about the newly-introduced check on the schema version in
    CCDB. It seems that all of our databases use version 3, but the latest
    release (1.0) insists on version 4. Mark will contact Dmitry about
    this.

One-Dimensional Arrays

    David told us about a change he made to CCDB so that one-dimensional
    arrays treated the same whether they are one-row-by-many-columns or
    many-columns-by-one-row. Until now, this made a difference for the CCDB
    but did not manifest itself in the old file-based constants system. The
    change is checked in on the trunk.

Minimum Hits for Track Candidates

    Beni asked Simon to implement a user-controlled minimum on the number
    of hits on a track candidates. Simon agreed to make sure that there are
    JANA parameters for the number of hits on the CDC segment, the FDC
    segment, and the complete track.

    Paul expressed a desire for a hit percentage to be calculated, i. e.,
    the number of hits found divided by the number of hits it could have
    had based on the trajectory. It was not clear whether this is practical
    outside of specialized studies.

References

   24. https://mailman.jlab.org/pipermail/halld-physics/2014-May/000413.html
   25. https://mailman.jlab.org/pipermail/halld-offline/2014-May/001670.html
   26. 
https://halldweb1.jlab.org/wiki/images/6/6c/Bcal_timing.20140528_offline_meeting.pdf