CREXAuxiliaryMeasurements-Aug2020

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
	Day	Production
	Swing	Pedestal Scans, PITA Scan. Production
Sunday Sept 13	Owl	Production
	Day	Optics
	Swing	Optics
Monday Sept 14	Owl	Final Q2 measurement. Inelastic spectrum. Poletip study (if time remains).
	Day (Thia/Bob)	Beam studies (10am-6pm). Install Blind quartz.
	Swing (Devi/Eric)	Recover from Beam Studies. Production (with Blind Quartz dets in place from now on).
Tuesday Sept 15	Owl (Adam/Amali)	Production (Maybe also pedestal scan?)
	Day (Rom/Siyu)	Moller measurement. Sign check.
	Swing (Devi/Eric)	Production
Wednesday Sept 16	Owl (Bishnu/Victoria)	Production
	Day (B.Yale/Siyu)	Raster and Target study
	Swing (Devi/Eric)	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

1. Q2 measurement
   • Repeat of Q2 measurement, with improved pedestal noise control.
   • Detector counting mode.
   • S0 trigger
   • production raster and beam position
2. 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
3. Energy Measurement
   • I think this is complete. I need to check with Doug.

Backgrounds

1. Blinded 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
   • Integrating measurement for asymmetry measurement
   • Counting mode measurement for rate?
   • Can we make a plan for yield measurement? Maybe use absolute table top gain measurements?
2. 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.
3. Pole tip re-scattering
   • Counting mode. Q3 turned off.
   • special setting on Q2?

Detectors

1. 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.
2. 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

1. Sign check
   • perform at next Moller polarimeter measurement
   • run Moller, Compton, and parity DAQ for quick PITA scan
2. Target/Raster study

Moller polarimetry

1. One more measurement

Compton polarimetry

1. Flip DOCP???
2. No-target runs
3. Laser polarization optimization
4. Laser polarization flip
5. linearity studies