Compton Meeting, September 17, 2014

*********NEW BLUEJEANS CALL-IN INSTRUCTIONS*********
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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: 831693292

Agenda

No meeting room. Call in, or come to Dave's office.

General

• Unblinding: Run 2 complete by December of this year?
  • Last meeting: let's see how ACCUM/SCALER ratio looks before committing
  • This meeting: ACCUM/SCALER results cause for concern?
• Rootfiles for the runs 23677 - 23764 missing (these had a different laser period)

Electron detector

• ACCUM/SCALER polarization comparisons
  • Initial comparisons of polarization and aggregate rates: DAQ & Analysis log 313
  • Aggregate rate comparisons with background (noise) subtraction: DAQ & Analysis log 314
  • Application of deadtime corrections?
• Beam energy: what to use?
  • ARC measurement ~ 1158 MeV (~ 1 MeV higher than Teifenback)
  • What's the sensitivity of the polarization extraction? Erik found small numbers for fixed COmpton edge analysis (0.07%/MeV) Edet log 407.
• Run 1 analysis
• Remaining items on big uncertainty table (helicity correlated positions and angles, etc.)

Photon Detector

• Analysis updates
  • Pedestal extraction progress (complete?)
    • Pedestals now computed for half periods
• DAQ updates
• Simulation
  • Analyzing power for different detector shielding configurations

Laser

• N/A