Difference between revisions of "Moller Polarimeter/A1n/d2n"
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<b>December 12, 2019</b> | <b>December 12, 2019</b> | ||
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| − | Five pass commissioning. Used preliminary <azz>. Randoms were higher than expected. Need more shielding? | + | Five pass commissioning. Used preliminary <azz>. Randoms were higher than expected. Need more shielding?. result: [https://logbooks.jlab.org/entry/3752542] |
<b>December 19, 2019</b> | <b>December 19, 2019</b> | ||
Determined the optimum quad settings, set the detector HV and performed the collimator scan pretty quickly. Before the collimator scan the measured polarization was 80%, after the scan it was 84.5% Unpolarized background? | Determined the optimum quad settings, set the detector HV and performed the collimator scan pretty quickly. Before the collimator scan the measured polarization was 80%, after the scan it was 84.5% Unpolarized background? | ||
| − | + | Summary:[https://logbooks.jlab.org/entry/3756521], Result: [https://logbooks.jlab.org/entry/3756510] | |
<b>January 18, 2020</b> | <b>January 18, 2020</b> | ||
| − | Before this measurement, timed in randoms so that right arm comes exactly 16 ns after left. [https://logbooks.jlab.org/entry/3764920]. During measurement, replaced 8 ns with 6 ns delay on left arm. Reduced left/right HV by 25 V (1245/1225). Ran with collimator 5 in - this reduced backgrounds a little. Q2/Q3 current changed to 1284.604 A. Bleedthrough check, ~ 10 nA. [https://logbooks.jlab.org/entry/3766408] Settings: [https://logbooks.jlab.org/entry/3766400]: [https://logbooks.jlab.org/entry/ | + | Before this measurement, timed in randoms so that right arm comes exactly 16 ns after left. [https://logbooks.jlab.org/entry/3764920]. During measurement, replaced 8 ns with 6 ns delay on left arm. Reduced left/right HV by 25 V (1245/1225). Ran with collimator 5 in - this reduced backgrounds a little. Q2/Q3 current changed to 1284.604 A. Bleedthrough check, ~ 10 nA. [https://logbooks.jlab.org/entry/3766408] Settings: [https://logbooks.jlab.org/entry/3766400], BPMs: [https://logbooks.jlab.org/entry/3766441] summary: [https://logbooks.jlab.org/entry/3766402], result: [https://logbooks.jlab.org/entry/3766434] |
| + | |||
| + | <br> | ||
<b>January 27, 2020</b> | <b>January 27, 2020</b> | ||
Revision as of 14:15, 16 August 2020
Moller measurement summaries for A1n/d2n
This is the "Cliff notes section on Moller polarimetry runs during the Polarized Helium-3 Running.
December 12, 2019
Five pass commissioning. Used preliminary <azz>. Randoms were higher than expected. Need more shielding?. result: [1]
December 19, 2019
Determined the optimum quad settings, set the detector HV and performed the collimator scan pretty quickly. Before the collimator scan the measured polarization was 80%, after the scan it was 84.5% Unpolarized background? Summary:[2], Result: [3]
January 18, 2020
Before this measurement, timed in randoms so that right arm comes exactly 16 ns after left. [4]. During measurement, replaced 8 ns with 6 ns delay on left arm. Reduced left/right HV by 25 V (1245/1225). Ran with collimator 5 in - this reduced backgrounds a little. Q2/Q3 current changed to 1284.604 A. Bleedthrough check, ~ 10 nA. [5] Settings: [6], BPMs: [7] summary: [8], result: [9]
January 27, 2020
Moller tune check and collimator settings[10].The beam current was 1 uA and IHWP IN. During the first three runs (1385-1387), Hall A was changing their slit and attenuator. During the last 3 runs(1388-1390),had the same slit settings. BPMs:[11], summary [12], result: [13]
February 3, 2020
Spin Dance, summary: [14], result: [15]
February 12, 2020
Some troubles delivering beam. Tried to take the other IHWP state but ended up backing out. summary: [16], result: [17]
February 19, 2020
Energy change in injector starting Feb 18th: [18] Measurements corrected for Hall A bleedthru (57 Hz) summary: [19], result: [20]
February 27, 2020
Changed HVs: [21] Noisy BPMS/readbacks: [22] , Large coin rates with no target, no beam, no collimators. Bleedthru/Scraping notes: [23] summary: [24], result: [25]
March 6th, 2020
Collimator 6 and 7 were scanned. Found 6 was impinging on coin rate. In and Out measured. Hall A Bleedthru (33Hz/4700Hz) summary: [26], results:[27]
March 12th, 2020
summary: [28]
August 3rd, 2020
summary: [29]
August 12th, 2020
summary: [30]
Table of good Moller runs
This will be a log of all "good" Moller runs; ie, our "production" runs. It will include some detailed notes when necessary.
Date Run Pol (%) Error (%) Hwien Flip Energy(MeV) Comment 01/18/20 1366 -29.64 right 10.3857 Detector Tune Check 1368 86.31 0.98 -29.64 right 10.3857 Production IHWP OUT 1369 85.23 0.98 -29.64 right 10.3857 Production IHWP OUT 1370 86.53 1.49 -29.64 right 10.3857 Production IHWP OUT 1371 -86.05 0.90 -29.64 right 10.3857 Production IHWP IN 1372 -85.69 0.99 -29.64 right 10.3857 Production IHWP IN 1374 -86.44 1.06 -29.64 right 10.3857 Production IHWP IN 1375 -84.96 1.79 -29.64 right 10.3857 Production IHWP IN 1376 -83.91 1.55 -29.64 right 10.3857 Production IHWP IN 1377 -85.18 1.60 -29.64 right 10.3857 Production IHWP IN 1378 -85.74 0.96 -29.64 right 10.3857 Production IHWP IN
