Thursday, May 21, 2015, 11:00am EDT - Compton

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1. Dial Toll-Free Number: 1-888-240-2560 (U.S. & Canada)
2. International participants dial:
Toll Number: 1-408-740-7256
3. Enter meeting ID:140287970


Meeting room=F227 in Cebaf Center


  • Update on test at 2 pass (Gaskell) pdf


  • Lots of DAQ work planned for this summer (Bob - if available)
    • Remove old Saclay counting DAQ
    • Put in new photon counting DAQ
    • How will this impact electron detector?
    • VETROC tests

Electron detector

  • Updates from Alexandre - did we learn anything from the little bit of beam we took?
    • Cannot get closer than 22 mm
    • Run 1370 : 1857 triple coincidence ABD, 1634 no hit plane C, 223 hits plane C at thresold 21 : 12 % efficiency though cannot conclude since it could be photons and corellated noise
  • Updates from Manitoba

Photon Detector

  • Analyzer - would be nice if we could get background subtracted asymmetries from 2 pass data.
  • Plans for upgrades or improvements this summer?


  • Primary goal is implementing polarization setting and monitoring a la Hall C.
  • Other tasks: Gather spares, get laser lab fully functional


[list=1] [*] Dave should get the Bluejeans stuff working properly - this will make life easier for future meetings. [*] Dave went over 2 pass commissioning stuff - a lot of things went well! [*] Electron detector commissioning trickier - at "22 mm"from beam , Alex starting seeing more rate in photon detector, ion chambers tripped. Info from BPM between dipoles 3-4 suggests beam might have been at larger y than expected.