Spring 2019 DIRC Commissioning

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Commissioning Goals

  • Integrate DIRC readout with general Hall D DAQ and online/offline monitoring
  • Calibrate per-pixel timing offset of MAPMTs using LED system
  • Determine geometric alignment parameters (position and angle offsets) for optical components
  • Implement reconstruction algorithm and compare data/MC: # detected photons, Cherenkov angle resolution

Commissioning Tasks and Milestones

  • TBD

Commissioning Timeline

  • July 16-30: Integration of DIRC crate with DAQ and initial test of readout with standalone MAPMT module (Ben, Sergey, Sasha)
  • August
    • Implementation of DAQ decoder for SSP data format in sim-recon to create low level hit objects (David)
    • Implementation of Translation Table in CCDB to orient (FPGA, channel ID) mapping from readout into physical pixel coordinates (X, Y) position along readout window (David, Justin, Bill)
    • Online and offline monitoring plugins to monitor LED data occupancies and timing distributions (W&M)
  • August 21 - October 29:
    • Parasitic tests during beam downtime with LED data to verify DAQ integration and translation table
  • October 29 - November 18 (3-week install period):
    • Initial time offset calibrations with LED data
    • HV and threshold scans with LED data
  • November 19 - December 19 (commissioning with beam):
    • TBD

Datasets to acquire with integrated DAQ

HV and threshold scans

  • Similar set of HV, MAROC gain, and threshold settings as laser setup for comparison with final implementation
  • Validate MAPMT characterization with both LED calibration and beam data

Intensity scans

  • Evaluate rate dependence and backgrounds for both high and low luminosity
  • Scans of fixed amorphous radiator and varied current from 50 - 300 nA

Simulation studies for commissioning

Requirements

  • Final "as built" geometry in CCDB with appropriate run number
  • Define JANA calibration variation for CCDB specific to DIRC(?)
  • LUT algorithm implemented as factor in DIRC sim-recon library

Data Samples

  • bggen sample (1M events) for comparison of rates and occupancies with data
  • single track pion and kaon samples in kinematic bins for comparison with data