[Halld-offline] Minutes, GlueX Offline Software Meeting, August 24, 2011

[Mark M. Ito]

Peeps,

Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_August_24%2C_2011#Minutes 
and below.

   -- Mark
  _____

GlueX Offline Meeting, August 24, 2011

Minutes

    Present:

    CMU: Will Levine, Paul Mattione IU: Kei Moriya, Matt Shepherd JLab:
    David Lawrence, Mark Ito (chair), Dmitry Romanov, Sascha Somov, Simon
    Taylor, Elliott Wolin, Beni Zihlmann UConn: Richard Jones

Announcements

    Elliott will update the "DANA-EVIO stuff" now that the reconstruction
    class re-arrangement has settled down.

Review of minutes from the last meeting

    We reviewed the [42]minutes from the August 10 meeting.
      * Elliott wondered if using an ORM was overkill for the online since
        the queries are so simple.
      * Paul asked for collective wisdom about deleting DPhoton from the
        trunk. He will delete it.


Proposal to shrink the DST data format size

    Richard objected to the title of this agenda item. Nonetheless...

    He walked us through the [44]recently circulated spreadsheet detailing
    the contents of the proposed DST and the anticipated savings in space
    for each reconstructed C++ class. The idea is to save enough
    information to reconstitute the targeted DANA classes minimizing the
    information while keeping the classes useful for data analysis.

    Some random notes:
      * The particle list cuts only di-quarks from those generated by
        PYTHIA
      * A compression scheme is possible and there were several proposals
        on how to do it.
      * The exact format of the serialized data is yet to be determined.


Tracking chi-squared/error update

    Paul led a discussion of [46]his wiki page. We discussed his proposal,
    to have a formal framework for calculating and storing hit-by-hit
    measurement errors and then propagate them forward to get sensible
    errors on particle kinematics. Several of us thought that concentrating
    on high-level kinematic quantities (e. g. energy of a cluster, angle of
    a track), post-reconstruction might be more fruitful.

Tracking dE/dx update

    Simon led us through [48]his wiki page. Executive summary:
      * units problem
      * fixed now


FCAL reconstruction update

    Beni had previously reported a surplus of split clusters in the FCAL,
    but on closer examination they turned out to be from photon conversions
    upstream of the FCAL producing separate, legitimate clusters. The
    reconstruction is behaving as expected.

BCAL reconstruction update

    Will led us through [51]his wiki page describing recent work
    understanding photons detected in the BCAL. His summary is reproduced
    here:
      * BCAL reconstruction seemed to be an obstacle in b1pi events
      * Two reconstruction algorithms in tree: KLOE algorithm=default,
        "new" algorithm by matt s.
      * Found two issues which lead to poor energy resolution at low E
        (fixes not checked in yet)
      * "New" algorithm seems to be doing well for single-photon events
      * Further study of b1pi, etc.
      * Further fine-tuning needed, but maybe should wait until BCAL
        segmentation finalized?

    Note that this is work in progress.

[53]FDC Changes in GSIM and [54]restoration of default behavior

    The title of this section says it all. The links in the title reference
    recent emails describing Simon's recent activity in the named areas.
    His summary (quoted from the agenda):
      * Default behavior (same as old): only the time at the doca is
        reported (no explicit cluster generation).
      * Drift times and diffusion computed based on results of Garfield
        simulations for nominal gas mixtures for FDC and CDC.


CCDB-related questions

    Dmitry posed some questions to the group on how to proceed with some
    problem corners with the CCDB. See [56]his talk for details. There were
    three main areas covered. All have to do with the conversion from the
    current flat-file-based calibration tree to the CCDB.
      * "calibration constants" that are in fact a list of reconstruction
        parameters
           + We decided that these should be converted to JANA parameters.
      * non-uniform comments in the current files (used to identify column
        names)
           + We decided that Dmitry should feel free to impose a uniform
             convention
      * very large calibration sets, in particular magnetic field maps
           + This will require more discussion.


New Action Item

      * Decide how to handle large calibration sets.

    Retrieved from
    
"http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_August_24%2C_2011"

References

   42. 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_August_10%2C_2011#Minutes
   44. 
http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1799
   46. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Mattione_Reconstruction_Uncertainties
   48. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Tracking_dE/dx_update
   51. 
http://www.jlab.org/Hall-D/software/wiki/index.php/BCAL_reconstruction_8/24/11
   53. 
https://mailman.jlab.org/pipermail/halld-offline/2011-July/000696.html
   54. 
https://mailman.jlab.org/pipermail/halld-offline/2011-August/000717.html
   56. 
https://halldweb1.jlab.org/talks/2011-3Q/CCDB_related_questions_08-24-2011.pptx