General Meeting Summary 3/1/17

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JLAB DETECTORS (Arthur)

  • Note that odd channel numbers correspond to the PMTs on the left as viewed from the target
  • Wider pedestal in accidental plots indicates that there is still some noise in the system as previously discussed
  • Discussion about Key Performance Parameter (KPP) run readiness
  • SHMS aerogel detector is ready including both hardware and software/Analyzer - DAQ software for aerogel detector has been checked against Vardan's Analyzer and gives consistent results
  • Need to update Hall C detector Wiki following example from calorimeter and DCs
  • PMT bases are currently still held by their pin connectors - need to devise permanent solution after KPP runs
  • Online spectra: for KPP will use mode 9 including ADC spectra/wave forms
  • KPP runs for Hall C will start on 6 March
  • NPS prototype has been modified to work with 8 crystals - need a new power supply for signal analysis
  • Plans for JLab detectors after KPP runs:
  • SP-11 aerogel tray finalize (install aerogel last layer, new cover, labeling of tray)
  • NPS HV divider tests with single-crystal prototype
  • NPS flash ADC tests with 8-crystal prototype


PBWO4 CRYSTALS

  • Discussion about prototype construction (Richard)
  • APD readout (Andres)
  • Found a problem with the LED board and working on fixing that


PIXEL DETECTORS (Rachel)

  • Half of BPIX has been installed. The rest is anticipated to be installed over the next weeks.
  • All blown fuses have been replaced and have not had any problems since (albeit with limited testing)
  • DAQ development is ongoing - this will provide online software for module testing
  • Beam is expected by 1 April with first collisions by 1 May


TCS PROJECTIONS (Vardan, Pawel)

  • Discussion about Figure Of Merit and interpretation in Hall A/C and Hall B
  • for CLAS/Hall B the detector acceptance is the product of detector and geometric efficiency, different from Hall A/C
  • typical approach for DVCS was to compare experiments based on kinematic reach and precision - may need to modify this approach for TCS proposal


NEXT MEETING: WED. 15 MARCH at 10:00 AM (EDT)

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