GEn: Software and Analysis Tasks

1
GEn Softwareand Analysis Tasks

• Robert J. Feuerbach (JLab) for
• The GEn Collaboration

2
Software Requirements of GEn

• Special two new apparatuses (and detectors)
• Track reconstruction from BigBite (new algorithm
  see Seamuss talk)
• Cluster/hit identification within BigHand
• Combine tracks from the two
• calibration, calibration, calibration
• Data Monitoring normal fast check of data
  quality

3
Using the Analyzer for GEn

• Worked on our own cvs branch, with goal to
  bring the wanted features back to the trunk.
• GenBPM new cavity BPMs (Brandon Craver)
• GenHelicity improved (Richard Holmes)
• Store fully-functional detectors in ROOT-file (to
  keep calibration information and have access to
  detector methods, eg nearest-neighbors
  geometry)
• Experiment-specialized software in separate
  library (agen).
• BB required a different processing order called
  for a new implementation of THaAnalyzer class
  (Seamus Riordan)
• BigHand veto and scintillators, BigBite
  detectors, optics, etc.

4
ND calibration software (timing)
J.Miller (UofMD)
5
ND Calibration (contd)
Scripts by Igor Rachek and Pavel Evtushenko
6
BigHand clustering

• Matches geometrically-close hits and places into
  a single cluster
• Neighboring hits are required to have dtlt10ns.
• Time of the hit closest to the target is used and
  reported as the clusters ToF.
• Total cluster energy is calculated, as well as
  shape characteristics
• Need to match to veto-plane as well to identify
  incident charged tracks.

7
BigHand events
8
Ongoing Analysis Tasks - Calibrations

• Database (mySQL) to collect run conditions, beam,
  and target information (Brandon Craver)
• ND geometry and timing calibration (Jon Miller)
• Shower calibration (Sergey Abrahamyan)
• BB Scintillator Calibration (Ameya Kolarkar)
• MWDC Calibration (Brandon and Seamus Riordan)
• BB Optics/tracking (Seamus)
• Target polarimetry (Ameya and Aidan Kelleher)
• Beam polarimetry (Sergey)
• Target field direction (Arie Beck)
• Raster corrections (Brandon)

9
Ongoing/Future Analysis Tasks

• Neutron identification and efficiency
• Estimate false-positive rate
• Monte-Carlo studies of background, rescattering
  effects within the target
• Cooking of the 3500 runs
• Link to mySQL database
• Use the JLab farm have scripts to ease handling
  of submission of jobs and record keeping (Nerses)
• Thought is to process kinematics 4 first.

10
Documentation - developments

• Used HALOG
• private ELOG during running to track bugs and
  fixes, software tools, etc. (A.Camsonne)
• and Wiki for post-experiment information
  collection (N.Gevorgyan)

11
Conclusions

• Modular framework simplified development and
  permitted re-use of much of the analyzer even
  with non-standard equipment.
• The reconstruction algorithms are in place, with
  plans to work to improve them.
• Calibrations underway.
• Want to have first results available by the Fall.