Compton Meeting, October 10, 2012 (L210A)

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Meeting room, L210A (NOTE: change from last week)


  • DNP coming up. Speakers should circulate slides by next meeting.
  • Qweak collaboration meeting is 5 weeks away. Let's plan ahead for what we want to show.
  • Pass 2 analysis progress
    • Analyzer crash resolved?
      • Yes, it was a bit of a memory management issue.
    • JC BPM calibration ELOG 246
    • Remaining analysis tasks Tasks


  • No updates until after the DNP.

Electron Detector

  • Follow-up on Edet log 431: change constraint on edge strip
  • What tasks remain for decision on whether to use 2 or 3 parameter fits?
  • Moller-Compton-Moller data with and without noise subtraction

Photon Detector

  • Tasks
    • Analytic calculation of analyzing power with continuous fit to non-linearity
    • Lead-tungstate in MC
  • Has anyone measured the lead yet?


  • Practice talks for DNP next Thursday at 10 am. Room F226.
  • Qweak collaboration meeting. Things I would like us to show:
    • Electron detector results --> detailed comparisons of Vladas' and Amrendra's analyses
    • Photon detector --> Slug wise results. Absolute numbers --> we have some estimate of non-linearity. Analyzing power for Lead tungstate should be calculable.
    • Long laser talk? Maybe defer to next Collaboration meeting.
  • BPM calibration: JC is doing it right. Difference between JC gains and nominal gains from EPICS somewhat disturbing. Mark D. points out that while absolute value of position is quite different, the Delta_y from the vertical scan is very similar. So for our purposes, it doesn't really matter. Let's use the EPICS alphas just to keep it simple.
  • Vladas' latest elog illustrates how the fit changes just with different fitting options in PAW/Minuit. Questions about how often the fits fail. It's not clear we understand what edm and eps are doing. Doesn't make sense to include those points.Vladas will post some results of fits for particular runs.