Difference between revisions of "GlueX Offline Meeting, July 25, 2012"

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Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2012-3Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .
 
Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2012-3Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .
 +
 +
=Minutes=
 +
 +
New Note 59
 +
 +
Offline software meeting notes, 7/25
 +
 +
elton, dude, simon, mark, elliott, paul, david
 +
ryan, matt
 +
curtis, will
 +
 +
announcements
 +
 +
david and elliott translation tables, serious thoughts send them along, proposed format circulated
 +
 +
how to turn on output
 +
no more work known to be done
 +
 +
simon positive charged tracks: pi k p
 +
negative k- pi-
 +
by default
 +
 +
calorimeters
 +
• david, putting in realism in bcal smearing
 +
∘ full electronic pulse shape, with dark hits
 +
∘ hdgeant and mcsmear, disabled by preprocessor directives. it as the default, unsmeared file much larger
 +
∘ mcsmear 4 times slower for single photons
 +
∘ times of execution are comparable, hgdgeant vs mcsmear, 3 times longer for hdgeant
 +
∘ pythia events, have been tried should be measured
 +
∘ presentation at future meeting
 +
 +
tracking, Simon
 +
• rate of execution, one additional swim over references eliminated,
 +
• straight line fitting for alignment of the chambers
 +
• algorithm to adjust parameters of each wire plane
 +
• allow for rotation and shift of entire plane
 +
• reference article, using silicon strips
 +
• convergence problems, put in annealing procedure, scale errors, tighten them up
 +
• Eltons suggestion, omega events for 1200 vs 1500 A in solenoid, looks like drop in performance due to reduction in background
 +
• started lamda, p pi- events, no conclusions yet
 +
• 1200 - 1500 20% loss in delta p/p, missing mass only worse by a few percent
 +
 +
Paul, topics
 +
• middle of writing a kinematic fitters, 4-momentum conservation, time constraints, rf timing, vertext constraint
 +
• hit in bcal, propagate time back to vertex, uncertainty in the time, with energy loss,
 +
• 7 variables, p3, t, x, y, z, in covariance matrix
 +
• hope to have results in two weeks
 +
 +
Comment
 +
 +
• ubuntu 64 reconstruction  does not work
 +
•
 +
•

Revision as of 16:04, 25 July 2012

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
  5. Review of recent repository activity: all

Communication Information

Video Conferencing

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .

Minutes

New Note 59

Offline software meeting notes, 7/25

elton, dude, simon, mark, elliott, paul, david ryan, matt curtis, will

announcements

david and elliott translation tables, serious thoughts send them along, proposed format circulated

how to turn on output no more work known to be done

simon positive charged tracks: pi k p negative k- pi- by default

calorimeters • david, putting in realism in bcal smearing ∘ full electronic pulse shape, with dark hits ∘ hdgeant and mcsmear, disabled by preprocessor directives. it as the default, unsmeared file much larger ∘ mcsmear 4 times slower for single photons ∘ times of execution are comparable, hgdgeant vs mcsmear, 3 times longer for hdgeant ∘ pythia events, have been tried should be measured ∘ presentation at future meeting

tracking, Simon • rate of execution, one additional swim over references eliminated, • straight line fitting for alignment of the chambers • algorithm to adjust parameters of each wire plane • allow for rotation and shift of entire plane • reference article, using silicon strips • convergence problems, put in annealing procedure, scale errors, tighten them up • Eltons suggestion, omega events for 1200 vs 1500 A in solenoid, looks like drop in performance due to reduction in background • started lamda, p pi- events, no conclusions yet • 1200 - 1500 20% loss in delta p/p, missing mass only worse by a few percent

Paul, topics • middle of writing a kinematic fitters, 4-momentum conservation, time constraints, rf timing, vertext constraint • hit in bcal, propagate time back to vertex, uncertainty in the time, with energy loss, • 7 variables, p3, t, x, y, z, in covariance matrix • hope to have results in two weeks

Comment

• ubuntu 64 reconstruction does not work • •

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