Difference between revisions of "Transversity/Expert Checklist"

Revision as of 23:17, 23 November 2008

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

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

Beamline, beam charge, beam polarization, Luminosity monitors

1. BPM A and B (x,) positions
2. Happex charge feed back is On ?
3. Beam charge asymmetry is below 100 ppm ? (Check end-of-run, and run Happex replay)
4. Lumi signals and replay OK ?, no saturation ?.
5. Beam charge at end-of-run make sense ?

Run information

1. Check scaler rate screen, pre-scale factors agree with earlier runs. example of normal rate @ 12uA 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. Happex run start ahead of transversity run ? (Happex run ends every four hours or so ?)
5. Look at shift worker's run-sheet records.
6. Confirm CODA not crashed, check DAQ-configuration: twoarm_RICH.
7. Check Halog entries.
8. Check if spin-flip is ON. Check target polarization history.
9. Check all HV on. BB chamber HV on before run starts.

Replay

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.

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#)

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, current run and golden run shows significant difference in TDC times.

Helpful Resources

• Analysis resources for transversity
• Expert Hints for Online Replay
• Experiment Transversity
• Hall A Log
• Run Data Base