HRS Detector Calibrations

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  • Use Optics "white" spectra to get maximum coverage of planes, take at least 250K events.
HRS Ebeam [GeV] P0 [GeV/c] θe [deg] Collimator Target Fast Raster
X x Y
Beam Current Trigger
Right 2.217 0.85 48.75 None Optics 3 mm x 3 mm 20 μA S0&&S2m
Left 2.217 1.0 17.5 None Optics 3 mm x 3 mm 20 μA S0&&S2m
  1. Check the timing and calibration constants (shower ADC gains, pedestals, timing offsets, pulse height corrections, attenuation lengths, efficiencies, position dependencies).
  2. VDCs and Straw Chambers
    * Look at drift time spectra, is the shape reasonable? in the right time range?
    * Fit for new time-to-distance map
    * Look at focal plane distributions.
    * Check fiducial tracking efficiency, is it > 95%, If not, then check TDC windows and tracking parameters.
  3. HRS Scintillators
    * Look at all channels, compare against standard histograms.
    * Are any channels firing at high rate (possible light leak)?
  4. Gas Cherenkov (Barak Schmookler)
    * Look at histograms (Npe vs. x, and Npe vs. Shower), compare with standard distributions, ideally there shoudl be no x dependence.
  5. Electromagnetic calorimeters
    * Make sure all ADC channels have signals.
    * Calibrate with electrons. Maybe not be possible at this energy due to low rates.
  • After these steps, the detectors should be fairly well calibrated.