[Halld-offline] Minutes, GlueX Offline Software Meeting, May 16, 2012

[Mark M. Ito]

Find the minutes at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_May_16,_2012#Minutes 
and below.
_____

GlueX Offline Meeting, May 16, 2012
Minutes

    Present:
      * CMU: Will Levine, Paul Mattione, Curtis Meyer
      * IU: Matt Shepherd,
      * JLab: Mark Ito (chair), David Lawrence, Simon Taylor, Elliott
        Wolin, Beni Zihlmann

Announcements

      * The halld group disk almost ran out of space yesterday. Some
        clean-up was done and the quota was increased from 105 GB to 125
        GB. David asked about the cost of this form of disk storage. No one
        present could answer so he will look into it.
      * A formal request for a new MySQL server has been submitted to JLab
        IT. The new server will mirror the calibration database and will
        allow read-only connections from off the JLab site. Agreement for
        such a configuration was agreed to some months ago.
      * There will be a special session for upgrades at the Collaboration
        Meeting next week. Richard will present his work on Geant4 in that
        session.

Review of minutes from the last meeting

    We reviewed the [32]minutes from the April 18th meeting.
      * On simulating sampling fluctuations in the BCAL, David reported
        that Elton Smith has summarized the discussion held when Andrei and
        Irina Semonov(a) were here. Work on this is planned for the summer.

Collaboration Meeting Agenda

    The current schedule for the offline session:
Tuesday May 22, 2012
11:30 Session IIIc (75) --- Offline - Chair: R. Jones
    11:30 (25) --- Overview - Mark Ito
    11:55 (25) --- Tracking Update - Simon Taylor
    12:20 (25) --- Calorimetry - Will Levine

Reconstruction sub-group reports

Calorimeters

    Will gave a report on photon reconstruction in b1pi events. See [33]his
    wiki page for details. He showed reconstruction studies for the BCAL
    and the FCAL for two cases:
     1. Standard full event reconstruction of b1pi events
     2. Individual photons and charged particles were selected
        kinematically from the b1pi generated events, but were simulated
        one photon (or pion, or proton) at a time.

    In the full event sample, reconstructed "photons" has a contamination
    from pions at low energy, as seen by comparing to the distribution from
    one-at-a-time pions. He also showed distributions of other cluster
    properties that might help distinguish between charged particles and
    photons.

Tracking

Tracking Code Improvements

    Simon mentioned two"
     1. There was a low momentum cut-off for protons at 350 MeV/c that he
        noticed while working the the rare eta decay proposal. This has
        improved due to recent changes.

    low momentum protons, rare eta 350 MeV/c cut-ff seen improved
     1. He has been working on the track recovery code, code that addresses
        kinks and other "broken" tracks. The chi-squared distributions are
        improving.

Spiral Track Update

    Paul showed recent improvements in reconstruction efficiency for the 90
    degree pions at 1.1, 1.5, and 2.1 GeV/c. See [34]his wiki page for
    details. He also showed distributions of the difference between thrown
    and reconstructed track parameters for track candidates and for
    time-based tracks. He also showed these plots for 60-degree pions.

    He is testing ideas to improve this area of phase space. Recent changes
    from Simon in hit pruning my help.

PID

    Paul will be working on PID studies related to a new Cerenkov counter
    after the collaboration meeting.

Start Counter Geometry Changes

    Puneet and Simon have put in changes to the start counter geometry into
    HDDS and HDGeant. Also some calibration files have changed to track
    these changes. The new geometry has a 30-counter arrangement. The old
    one had 40.

    The target scattering chamber dimensions have also changed recently and
    the new values were included in this update.

    We will need a new tagged version of HDDS, sim-recon, and calib. Mark
    will work on that.

Offline Software Review Planning

    David updated us on the status of the preparation effort. He urged us
    to review the draft talks at on the [35]review planning wiki page and
    give the authors' feedback.

    Curtis also mentioned that there was a set of written material that
    needs to be put together still.

Action Item and Repository Activity Review

    We did this. A wonderful time was had by all.

    Retrieved from
    "https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_M
    ay_16,_2012"

References

   32. 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_18,_2012#Minutes
   33. 
https://halldweb1.jlab.org/wiki/index.php/Photon_Reconstruction_in_b1pi_events_04/25/2012
   34. https://halldweb1.jlab.org/wiki/index.php/Mattione_Update_05162012
   35. 
https://halldweb1.jlab.org/wiki/index.php/2012_Software_Review#Presentations

-- 
Mark M. Ito
Jefferson Lab (www.jlab.org)
(757)269-5295