Half-Wave-Plate

1. Half-Wave-Plate in Data

Period Half-Wave-Plate Target Polarization
Period 1 (55521 - 55536) IN L+- (<=)
Period 2 (55537 - 55555) OUT L+- (<=)
Period 3 (55556 - 55595) IN L++ (=>)
Period 4 (55604 - 55625) IN <=(?)
Period 5 (55630 - 55678) IN =>(?)
Period 6 (56164 - 56193) IN L++ (=>)
Period 7 (56196 - 56233) IN L+- (<=)
TGBI latch1 Beam Helicity
bit-16 λ/2(OUT) λ/2(IN)
1 + (BPol02) - (BPol01)
0 - (BPol01) + (BPol02)


2. The comment about Half-Wave-Plate in the electronic log book

If you click the run, you can see the log book direct.

55534

1/2 Wave Plate Switched Out. Run 55537 started at 2:18.

55544

1/2 waveplate: 1.000

55552

1/2 waveplate: 1.000

55554

15:40 Started run 55555. 11nA. Half-wave plate in.

55555

16:52 Starting run 55556. 1/2 wave plate IN, beam asymmetry looks good.

55565

17:10 Starting run #55566, 1/2 wave plate IN
18:55 DAQ is back. Started run #55567, 1/2 wave plate IN

55572

16:30 Starting run #55573, 1/2 wave plate IN
19:00 Starting run #55574, 1/2 wave plate IN
22:27 Starting run #55575, 1/2 wave plate in

55578

21:12 Starting run #55580, 1/2 wave plate IN
23:38 Starting run #55581, 1/2 wave plate IN

55588

1/2 waveplate: 0.000

55606

14:21 Started production run 55608. Half Wave plate in;
15:22 Started production run 55610. RF signal seems normal. 1/2 wave plate in, target polarization -6.503

55608

1/2 waveplate: 0.000

55627

1/2 waveplate: 0.000

55643

13:08 BCA was on average ~ 0.1% for the last 10 min. We adjusted the IA number (1/2 wave plate IN and positive BCA

56068

Hall A asked if they could insert the 1/2 wave plate. We told them to go ahead since this won't affect us while we are on unpolarized electron beam/linearly polarized photon beam. The 1/2 wave plate was inserted starting with run 56068.

56112

00:15 MCC called to say that Hall A wants to put 1/2 wave plate IN. Stop run 56111 with 15.4M events.
00:48 MCC calls, Hall A wants 1/2 wave plate OUT; end run 56113 with 0.5M events.
00:52 Start run 56114, PERP w/ 1/2 wave plate OUT.
01:16 MCC calls, Hall A wants 1/2 wave plate IN; end run 56114 with 5.0M events.
01:18 Start run 56115, PERP w/ 1/2 wave plate IN.
02:38 Start run 56116, PARA w/ 1/2 wave plate IN.

56163

20:46 Started run 56165: PROD, circ, hw plate in, 14 nA
22:55 Started run 56166: PROD, circ, hw plate in, 14nA

56166

1:05 Run 56167 begun with halfwave plate in.

56173

17:04 54173 ended; starting 54174: PROD configuration, circ.polarization, hw plate in, 14 nA.
19:15 54174 done, starting 54175: PROD, circ, hw plate in, 14 nA.

56177

1:48 Run 56178 started: PROD, circ, 14 nA, hw plate in.
3:36 Run 56179 started: PROD, circ, 14nA, hw plate in
5:42 Run 56180 started: PROD, circ, 14nA, hw plate in.

56185

16:26 Starting 56186:PROD, circ, 1/2 plate in.

56189

00:45 Run 56190 begins: circ, PROD, 14nA, hw plate in.
2:48 Run 56191 started:circ, PROD, 14 nA, hw plate in.
4:50 Run 56192 started:circ, PROD, 14 nA, hw plate in.
6:53 Run 56193 started: circ, PROD, 14nA, hw plate in.

56194

1/2 waveplate: 0.000

56202

1/2 waveplate: 0.000