Latest revision as of 11:11, 31 March 2015

GlueX Offline Software Meeting
Wednesday, July 25, 2012
1:30 pm EDT
JLab: CEBAF Center, F326/327

Agenda

1. Announcements
   1. Data Challenge Meetings
   2. Scientific Computing Survey
   3. No more software sessions in Tracking Meetings (by default)
2. Review of minutes from the last meeting: all
3. Reconstruction sub-group reports
   1. Calorimeters
   2. Tracking
   3. PID
4. Action Item Review
   • Recently Resolved
   • Outstanding Items
5. Review of recent repository activity: all

Communication Information

Video Conferencing

• ESNet: 8542553
• EVO:
  • Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=e9eIeivev8aMaMIvaaI9
  • Phone Bridge ID: 13 0949

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2012-3Q/ .

Minutes

Present:

• CMU: Will Levine, Curtis Meyer
• IU: Ryan Mitchell, Matt Shepherd
• JLab: Mark Ito (chair), Manuel Lara, David Lawrence, Paul Mattione, Elton Smith, Simon Taylor, Elliott Wolin, Beni Zihlmann

Announcements

• Data Challenge Meetings have started on alternate Mondays at 1:30 pm.
• Mark urged us to participate in the Scientific Computing Survey.
• There will be no more (default) software sessions as part of the bi-weekly Tracking Meeting.
• David and Elliott have started work on translation tables. If you have thoughts send them along. A proposed format was circulated on the Offline email list.

Review of Minutes from Previous Meetings

Offline Meeting

We reviewed the minutes from the July 11th meeting.

• Paul reported that he thinks all work has been done for now on the REST format. We can start using it in production.
• Simon made the promised changes in the default track hypotheses generated:
  • Positive tracks: pi, K, p
  • Negative tracks: pi, K

Data Challenge Meeting

We looked at the minutes of the July 16th meeting without significant comment.

Reconstruction Sub-Group Reports

Calorimeters

David has been working on putting more realism in the BCAL smearing.

• Full electronic pulse shape are generated, with dark hits.
• Changes have been made to hdgeant and mcsmear. They are currently disabled by pre-processor directives.
• The unsmeared file is much larger; mcsmear is four times slower for single photon events
• hdgeant is about three times slower than mcsmear previously.
• David will give a presentation on this work at a future meeting.

Tracking

Simon gave a report:

• One final, additional swim over reference trajectory eliminated.
• The straight line fitting for alignment of the chambers is working.
  • Working with an algorithm to adjust parameters of each wire plane.
  • Allows for rotation and shift of entire plane.
  • Some convergence difficulties being worked on presently.
• Looking at omega events to compare perfomance at 1200 A vs. 1500 A in the solenoid.
  • Looks like there is a drop in performance due to reduction in background.
  • Started work on lambda to p pi- events, no conclusions yet.
  • In comparison of 1200/1500 A, see a 20% loss in Δp/p, but missing mass only worse by a few percent.

PID

Paul gave a report:

• He is in the middle of writing a kinematic fitter. Will incorporate 4-momentum conservation, time constraints, RF timing, vertex constraints
• Using 7 variables in the covariance matrix: px, py, pz, t, x, y, and z.
• Hopes to have results in two weeks.

Ubuntu

Beni reports that he is having problems building a working copy of the GlueX software on an Ubuntu 64-bit system.

Review of Action Items and Repository Activity

• Dmitry Romanov is scheduled to arrive back at JLab in early August.
• We noted that Richard checked in a solution the the problem initially reported by David where hddm-xml was running out of buffer space.