Spring 2019 DIRC Commissioning

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

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 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