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