Difference between revisions of "Moller Polarimeter/A1n/d2n"
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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] | Summary:[https://logbooks.jlab.org/entry/3756521], Result: [https://logbooks.jlab.org/entry/3756510] | ||
| − | + | Epics:[https://logbooks.jlab.org/entry/3756380] | |
<b>January 18, 2020</b> | <b>January 18, 2020</b> | ||
Revision as of 08:15, 17 August 2021
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] Epics:[4] January 18, 2020
Before this measurement, timed in randoms so that right arm comes exactly 16 ns after left. [5]. 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. [6] Settings: [7], BPMs: [8] summary: [9], result: [10]
January 27, 2020
Moller tune check and collimator settings[11].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:[12], summary [13], result: [14]
February 3, 2020
Spin Dance, summary: [15], result: [16]
February 12, 2020
Some troubles delivering beam. Tried to take the other IHWP state but ended up backing out. summary: [17], result: [18]
February 19, 2020
Energy change in injector starting Feb 18th: [19] Measurements corrected for Hall A bleedthru (57 Hz) summary: [20], result: [21]
February 27, 2020
Changed HVs: [22] Noisy BPMS/readbacks: [23] , Large coin rates with no target, no beam, no collimators. Bleedthru/Scraping notes: [24] summary: [25], result: [26]
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: [27], results:[28]
March 12th, 2020 Checked collimator 6 (2.95 vs 2.65). summary: [29], result: [30]
August 3rd, 2020 Gain matched L/R. High rates with no target and no collimators to start but operator tuned beam and the rates came down. summary: [31], result: [32]
August 12th, 2020 Day shift operator had a lot of trouble tuning. Then no beam for several hours (storms/RF), came back at 7pm. summary: [33], result: [34]
August 25th, 2020
September 3rd, 2020 Measurement completed in 1/2 shift. :) Bleedthru@ 0.78% Summary:[35], result: [36]
September 11th, 2020
September 16th, 2020
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
Table of Bleed Thru Runs
Date Run Comment 1/18 1373 40 Hz Coin (5 kHz at 0.8 uA)
Table of Tune Check Runs
Date Run Comment 1/18 1364 1294.6 1/18 1365 1289.6 1/18 1366 1284.6
