Difference between revisions of "CREXAuxiliaryMeasurements-Aug2020"
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| − | | SAD Safety Meeting 9-11am https://primetime.bluejeans.com/a2m/live-event/tkcbphay | + | | SAD Safety Meeting 9-11am https://primetime.bluejeans.com/a2m/live-event/tkcbphay ; Production if beam available |
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|Swing (Devi/Siyu) | |Swing (Devi/Siyu) | ||
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| − | |Swing (Devi/ | + | |Swing (Devi/?) |
| Complete raster and target study. Pedestal scans, PITA scan. Production | | Complete raster and target study. Pedestal scans, PITA scan. Production | ||
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Revision as of 09:08, 15 September 2020
CREX Main << August 2020 CREX Run Plan
Contents
Schedule
- This plan is evolving as we move along
| 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) | Production. | (No scans done.) 39 min ABU! |
| Day (Bob/Eric) | Final Q2 measurement. Optics [1] | Acc mostly down; Bob took escorted access and switched to Counting Mode | |
| Swing (Zeke/Pitt) | Optics [2] | Sanghwa for Analysis and remote assistance. Mostly completed optics. | |
| Monday Sept 14 | Owl (Adam/Amali) | Inelastic spectrum. Poletip study [3] | Chandan for Analysis and remote assistance. Finished optics, inelastic spectrum, poletip study |
| Day (Thia/Bob) | 10am - noon Beam studies 1: Hall in Controlled Access (CA) - Install blind At PMT, Blind main Detector; noon - 4:15pm Beam available to ready Halls - we take data with blinded tubes. | Devi required for tube blinding | |
| Swing (Devi/Eric) | 4:15pm - 8:15pm Beam studies 2: Hall in CA - restore US PMTs, Compton e-Det work; 8:15pm - 9:15pm Beam recovery and onward delivery. Production. | ||
| Tuesday Sept 15 | Owl (Adam/Amali) | Pedestal Scans, PITA scan. Production. | |
| Day (Rom/Eric) | SAD Safety Meeting 9-11am https://primetime.bluejeans.com/a2m/live-event/tkcbphay ; Production if beam available | ||
| Swing (Devi/Siyu) | Production | ||
| Wednesday Sept 16 | Owl (Bishnu/Victoria) | Production | |
| Day (Simona/Eric/B.Yale - standby) | 8am start Moller measurement. Sign check. Followed by raster and Target study | ||
| Swing (Devi/?) | Complete raster and target study. Pedestal scans, PITA scan. Production | ||
| Thursday Sept 17 | Owl (Victoria/Siyu) | Production. | |
| Day (Rom/Weibin) | Production | ||
| Swing (Zeke/Adam) | Production | ||
| Friday Sept 18 | Owl (Victoria/Siyu) | 6am SHUTDOWN | |
| Day (Rom/Weibin) | ----- |
Optics and Q2
- Q2 measurement (Done)
- Repeat of Q2 measurement, with improved pedestal noise control.
- Detector counting mode.
- S0 trigger
- production raster and beam position
- Optics Data (Done)
- 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 (Done)
- Doug did a parasitic energy measurement Sun, Sep 13 at 20:24 [4].
Backgrounds
- Blinded At PMTs (Done)
- Longish access to setup and back out, but short data taking period (production conditions).
- Reconfigure AT PMTs 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 PMTs 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? (Done)
- 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 (Done)
- 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. Use LHRS only.
- should scale all spectrometer magnets (including septum)
- Pole tip re-scattering (Done)
- 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 has repeated the request.
Other
- Sign check
- perform at next Moller polarimeter measurement
- run Moller, Compton, and parity DAQ for quick PITA scan
- Target/Raster study
- Set up for normal production mode. Call in experts (Bob M in person, Cameron remote).
- With each raster change we start with a brief C12 run for safety, then do a brief Ca48 run.
- Raster Scan Run Plan
Moller polarimetry
- One more measurement
Compton polarimetry
- Spectrum run
- Laser polarization changes
- linearity studies During SAD
