[Mott] Mott program for Thursday, Feb. 13th

[Joseph Grames]

Mott program for Thursday, Feb. 13th continues on SWING focussing on systematics.

Feb 12th SUMMARY
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1. (Cade) - Update controls screen to correctly displan 5MeV dipole magnet
2. (Moffit) - Found/fixed DAQ deadtime issue (trigger pulse too narrow), details: https://logbooks.jlab.org/entry/3269684
3. (Suleiman) - Add "S1" scalers which continuously update, details: https://logbooks.jlab.org/entry/3269681
4. (Lauze) - Verifed flowmeter cables in tunnel/ISB for new dump LCW hook-up
5. (Adderley) - Cu dump plate cleaned; dump cooling circuit completed; waiting on high-temp o-ring and Al screw to affix Be plate
6. (Slominski) - Re-activated archiving of 96 scaler channels in EPICS, and added MottRunNumber too.

Feb 13th - SWING
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1. Recover beam at KE=5.0 MeV to Mott line, initially with P=P0<z> on 1um Au target <2uA CW.

2. Reproduce last night's "good" 499MHz run condition (similar E, dE rates; instrumental asymmetries consistent with zero).

3. Change from 499MHz to 31MHz operation, test for similar response.

4. DAQ studies: Measure dead-time vs. rate => determine reasonable operating rate for tonight.

5. Beam at target: Measure instr. asym. vs. spot size and position for typical operating range.

6. Dump effects: Measure instr. asym. vs. dump dipole ON, OFF w/ targets=(thru, three thicknesses of gold).

7. Measure polarization Py: Set vertical Wien for P=P0<y> => measure phys. and instr. asym. with half-wave plate IN/OUT

8. False asymmetry: Measure phys. and instr. asym. vs. induced charge asymmetry (IA) and Pockels cell off.

9. Measure polarization Px: Set phi rotators for P=P0<x> => repeat measure phys. and instr. asym. with half-wave plate IN/OUT

10. If proceeding well, continue with systematic studies that adjust KE and spread (KE +/- , Crest +/-)