CREXAuxiliaryMeasurements-Aug2020
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CREX Main << August 2020 CREX Run Plan
Schedule
- This is just a proposal, not settled.
Day, Date | Shift | Tasks (Responsible Party) | Comments/Status |
---|---|---|---|
Saturday Sept 12 | Owl | Production | DONE |
Day | Production | DONE | |
Swing (Zeke/Pitt) | Production | DONE | |
Sunday Sept 13 | Owl (Adam/Tao) | Pedestal Scans, PITA Scan. Production. | |
Day (Bob/Eric) | Final Q2 measurement. Optics | ARM support for access to the huts to go do counting mode | |
Swing (Zeke/Pitt) | Optics | Sanghwa(?, or Cip) for Analysis and remote assistance. | |
Monday Sept 14 | Owl (Adam/Amali) | Inelastic spectrum. Poletip study (if time remains). | (Ask Chandan for remote help). |
Day (Thia/Bob) | 10am - noon Beam studies 1 (Install blind At PMT); noon - 4:15pm Beam available to ready Halls - we take data. | Devi required for tube blinding | |
Swing (Devi/Eric) | 4:15pm - 9:15pm Beam studies 2 (Remove blind At PMT); 9:15pm Beam recovery and delivery. Production. | ||
Tuesday Sept 15 | Owl (Adam/Amali) | Production (Maybe also pedestal scan?) | |
Day (Simona/Eric/Rom) | 8am start Moller measurement. Sign check. SAD Safety Meeting 9-11am. | Blind main detectors heading into this. Need RadCon support for blinding immediately after safety meeting | |
Swing (Devi/Siyu) | 1. finish Moller measurement. 2. blind detector measurement. 3. unblind main tube. 4. Back to production | Need RadCon support for unblinding, in mid-to-late swing. Need an additional access for counting mode config. | |
Wednesday Sept 16 | Owl (Bishnu/Victoria) | Production | |
Day (B.Yale/Siyu) | Followed by raster and Target study | ||
Swing (Devi/Eric) | Complete raster and target study. Production | ||
Thursday Sept 17 | Owl (Victoria/Siyu) | Production | |
Day (Rom/Weibin) | SHUTDOWN | ||
Swing (Zeke/Adam) | ----- | ||
Friday Sept 18 | Owl (Victoria/Siyu) | ----- | |
Day (Rom/Weibin) | ----- |
Optics and Q2
- Q2 measurement
- Repeat of Q2 measurement, with improved pedestal noise control.
- Detector counting mode.
- S0 trigger
- production raster and beam position
- Optics Data
- Sieve IN, dp=+1, 0, (maybe -1). Raster/no raster thin C, raster H20
- Priority is 1 dp change (both arms!) plus backout, and 10 runs. Watercell runs should be long.
- Assume 3 hours for magnet changes and 2 hours for data taking. ~ 1 shift
- See grid on optics data spreadsheet
- Energy Measurement
- I think this is complete. I need to check with Doug.
Backgrounds
- Blinded At Quartz
- Longish access to setup and back out, but short data taking period (production conditions).
- Reconfigure AT detectors to use blinding cap, attach to US PMTs.
- This will be done during the long beam studies break on Monday
- software blinding on the AT tubes must be disabled
- Check pedestal noise in counting and in integrating mode. We need low noise is the blinded tube, and we can't add noise to our main detector!
- Integrating measurement for asymmetry measurement
- (Do we want counting mode measurement for rate in blinded At tube?)
- (yield only normalizable using table-gain gain curves).
- Blinded Main detector?
- Need 2 hours to blind main detectors. Then another hour after meaurement to unblind.
- short-ish yield runs in integrating mode.
- Software blinding must be disabled on the blinded MD tubes for this study
- short counting mode run to get relative rate
- Then return. Keep AT blinded piggybacked for asymmetry measurement.
- Inelastic spectrum scan (~1 shift)
- Needs a detailed run plan
- Counting mode. Current 0.5uA or so? Turn quartz HV off.
- Measure dp spectrum form dp=nominal to dp=-25%, in 5% steps.
- should scale all spectrometer magnets (including septum)
- Once the elastic peak is out of the focal plane, it may be possible turn on the S3 and S0 scintillator. This should be done when possible, and the T1/T2/T3 trigger rate recorded for each run.
- Pole tip re-scattering
- Counting mode (VDC tracking). Counting mode on detector is ok (and helpful) but not needed.
- Q3 turned off.
- Run three septum setpoints: nominal, -5%, and +5%. Need ~1M S0 trigger events per run (and more is better).
Detectors
- Linearity Studies (PITA + current scans)
- These are ongoing - should continue regularly. At least once more,maybe twice.
- Useful to have one after we get the blinded tubes in place.
- Current scans for detector and BCM pedestals. Skip the BPMs, I think.
- Linearity LED tests
- This will be studied post run, during SAD
- detector crew were left off the SAD access list - Kent needs to get this fixed.
Other
- Sign check
- perform at next Moller polarimeter measurement
- run Moller, Compton, and parity DAQ for quick PITA scan
- Target/Raster study
Moller polarimetry
- One more measurement
Compton polarimetry
- Flip DOCP???
- No-target runs
- Laser polarization optimization
- Laser polarization flip
- linearity studies