View source for Moller Polarimeter/A1n/d2n


==Moller measurement summaries for A1n/d2n==
This is the "Cliff notes section on Moller polarimetry runs during the Polarized Helium-3 Running.

<b>December 12, 2019</b>

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>

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>  

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]

<b>January 27, 2020</b> 

Moller tune check and collimator settings[https://logbooks.jlab.org/entry/3772104].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:[https://logbooks.jlab.org/entry/3772135], summary [https://logbooks.jlab.org/entry/3771982], result: [https://logbooks.jlab.org/entry/3772152]

<b>February 3, 2020</b>

Spin Dance, summary: [https://logbooks.jlab.org/entry/3776671], result: [https://logbooks.jlab.org/entry/3776854]

<b>February 12, 2020</b> 

Some troubles delivering beam.  Tried to take the other IHWP state but ended up backing out.
summary: [https://logbooks.jlab.org/entry/3782578], result: [https://logbooks.jlab.org/entry/3782733]

<b>February 19, 2020</b>

Energy change in injector starting Feb 18th: [https://logbooks.jlab.org/entry/3793295]
Measurements corrected for Hall A bleedthru (57 Hz)
summary: [https://logbooks.jlab.org/entry/3787300], result: [https://logbooks.jlab.org/entry/3787424]

<b>February 27, 2020</b> 

Changed HVs: [https://logbooks.jlab.org/entry/3793223] Noisy BPMS/readbacks: [https://logbooks.jlab.org/entry/3793244] , Large coin rates with no target, no beam, no collimators.  Bleedthru/Scraping notes: [https://logbooks.jlab.org/entry/3793794]
summary: [https://logbooks.jlab.org/entry/3793115], result: [https://logbooks.jlab.org/entry/3793398] 

<b>March 6th, 2020</b> 

Collimator 6 and 7 were scanned.  Found 6 was impinging on coin rate.
In and Out measured.  Hall A Bleedthru (33Hz/4700Hz)
summary: [https://logbooks.jlab.org/entry/3798463], results:[https://logbooks.jlab.org/entry/3798622]

<b>March 12th, 2020</b> 
Checked collimator 6 (2.95 vs 2.65).  
summary: [https://logbooks.jlab.org/entry/3802667], result: [https://logbooks.jlab.org/entry/3802795]

<b>August 3rd, 2020</b> 
Gain matched L/R.  High rates with no target and no collimators to start but operator tuned beam and the rates came down.  
summary: [https://logbooks.jlab.org/entry/3819972], result: [https://logbooks.jlab.org/entry/3820234]

<b>August 12th, 2020</b> 
Day shift operator had a lot of trouble tuning.  Then no beam for several hours (storms/RF), came back at 7pm.
summary: [https://logbooks.jlab.org/entry/3825625], result: [https://logbooks.jlab.org/entry/3826006]

<b>August 25th, 2020</b> 

<b>September 3rd, 2020</b> 
Measurement completed in 1/2 shift. :)
Bleedthru@ 0.78%
Summary:[https://logbooks.jlab.org/entry/3840128], result: [https://logbooks.jlab.org/entry/3840191]

<b>September 11th, 2020</b> 

<b>September 16th, 2020</b>

==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. 

<pre>
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