D2n/Expert Checklist

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This is the check list for experts on D2n data checker shift.

Notice : Please add items of your specialty field, so every one will do the check

Beamline, beam charge, beam polarization

  1. BPM A and B (x,y) positions
    • Check the front room white board for default value
  2. Beam charge asymmetry is small (less than 1000ppm)
  3. Check that the beam charge at end-of-run makes sense ?
    • All BCM charge reading should be consistent
    • Example of Good Run:
BCM u1 [ 0]:0.03799        BCM u3 [ 0]:0.03798        BCM u10[ 0]:0.0336         
BCM u1 [++]:0.009217       BCM u3 [++]:0.009211       BCM u10[++]:0.008148       
BCM u1 [--]:0.009464       BCM u3 [--]:0.009462       BCM u10[--]:0.008371       
BCM u1 [+-]:0.009214       BCM u3 [+-]:0.009211       BCM u10[+-]:0.008148       
BCM u1 [-+]:0.009466       BCM u3 [-+]:0.009465       BCM u10[-+]:0.008373       

BCM d1 [ 0]:0.03786        BCM d3 [ 0]:0.03787        BCM d10[ 0]:0.03787        
BCM d1 [++]:0.009183       BCM d3 [++]:0.009198       BCM d10[++]:0.009188       
BCM d1 [--]:0.009428       BCM d3 [--]:0.009432       BCM d10[--]:0.009432       
BCM d1 [+-]:0.009182       BCM d3 [+-]:0.009185       BCM d10[+-]:0.009185       
BCM d1 [-+]:0.009431       BCM d3 [-+]:0.009434       BCM d10[-+]:0.009436    

Run information

  1. Check scaler rate screen, pre-scale factors agree with earlier runs. example of normal rate @ 15uA prodction
  2. Check online CODA rate and CODA dead time. (Run scaler script, verify deadtime)
  3. Check start-of-run input. Target type, beam half wave plate, etc.
  4. Restart Compton and HAPPEX every two hours or so
  5. Look at shift worker's run-sheet records.
  6. Confirm CODA not crashed, check DAQ-configuration:
    1. LHRS: Lefthrs
    2. BigBite: bigbite_buf
  7. Check Halog entries.
  8. Check target polarization history.
    (Old picture. Need a new one since there is no spin flip for D2n) Example plot of a stable target
    1. Go To Target Status History
  9. Check all HV on. BB chamber HV on before run starts.
    • Example Start Run with All HV On
    • Check Section
      • Left S2 HV Left/Right PMTs
      • Left S1/Cerenkov/A1 Cerenkov HV
      • Left Pion Rejector Layer 1/2 HV
      • Map BB_SC_R Measured Voltage/Current
      • Map BB_DC Measured Voltage/Current
      • Map BB_PS_R Measured Voltage/Current
      • Map BB_SC_L Measured Voltage/Current
      • Map BB_PS_L Measured Voltage/Current
      • Map BB_SH Measured Voltage/Current
  10. Halog left arm VDC efficiency plots once a shift
  11. Do Compton monitoring


Run show_all(<run number>) script after shift worker finish a replay. It will pop up a set of plots for expert, which would take ~10min to check through.

  • If the replay number is less than 20000, the analysis is for BigBite.
  • If the replay number is greater than 20000, the analysis is for LHRS.
    • Be sure to run show_all(<run number>) for each.

A list of minimum check items : (Item / related online plots)

  1. Check left-HRS VDC efficiency / online("detectorL",run#)
  2. Check left-HRS VDC time / online("detectorL",run#)
  3. Check BB chamber wire map / online("detectorBB",run#)
  4. Check BB shower vs preshower ADC plot, threshold not changed / online("physics",run#)
  5. Check scaler consistency / online("scalar",run#)
  6. Spot++ / equavlent plots (raster current, BPMs) are included in online("detectorL",run#)

Hint : You can try to do_all() the golden run to find out what a normal plots should look like

A list of known problems / possible bad runs

  1. BB chamber HV not on all the time.
  2. Left-arm VDC gas problem, low efficiency.
  3. Left-arm TDC shifts, symptom is current run and golden run shows significant difference in TDC times.

Helpful Resources