Difference between revisions of "Moller Polarimeter/A1n/d2n"

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==Moller measurement summaries for A1n/d2n==
 
==Moller measurement summaries for A1n/d2n==
 
This is the "Cliff notes section on Moller polarimetry runs during the Polarized Helium-3 Running.
 
This is the "Cliff notes section on Moller polarimetry runs during the Polarized Helium-3 Running.
  
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Note on sign of polarization [https://hallcweb.jlab.org/polwiki/index.php/Sign_of_the_beam_polarization]
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Hall A spin dance Jan. 07 th, 2020 [https://logbooks.jlab.org/entry/3759691]
  
−
'''January 27, 2020''' Moller tune check and collimator settings[https://logbooks.jlab.org/entry/3772104]
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<b>December 12, 2019</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] Summary: [https://logbooks.jlab.org/entry/3766402] Measurements: [https://logbooks.jlab.org/entry/3766434] BPMs: [https://logbooks.jlab.org/entry/3766441]<br>
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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>
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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? 
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Summary:[https://logbooks.jlab.org/entry/3756521], Result: [https://logbooks.jlab.org/entry/3756510]
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Epics:[https://logbooks.jlab.org/entry/3756380]
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<b>January 18, 2020</b> 
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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]
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 +
<b>January 27, 2020</b>
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 +
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]
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<b>February 3, 2020</b>
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Spin Dance, summary: [https://logbooks.jlab.org/entry/3776671], result: [https://logbooks.jlab.org/entry/3776854]
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<b>February 12, 2020</b>
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Some troubles delivering beam.  Tried to take the other IHWP state but ended up backing out.
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summary: [https://logbooks.jlab.org/entry/3782578], result: [https://logbooks.jlab.org/entry/3782733]
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<b>FLIP RIGHT (88.0)  to FLIP LEFT (-90.6) February 17, 2020  ~10am </b>
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<b>February 19, 2020</b>
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Energy change in injector starting Feb 18th: [https://logbooks.jlab.org/entry/3793295]
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Measurements corrected for Hall A bleedthru (57 Hz)
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summary: [https://logbooks.jlab.org/entry/3787300], result: [https://logbooks.jlab.org/entry/3787424]
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<b>February 27, 2020</b>
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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]
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summary: [https://logbooks.jlab.org/entry/3793115], result: [https://logbooks.jlab.org/entry/3793398]
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<b>March 6th, 2020</b>
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Collimator 6 and 7 were scanned.  Found 6 was impinging on coin rate.
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In and Out measured.  Hall A Bleedthru (33Hz/4700Hz)
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summary: [https://logbooks.jlab.org/entry/3798463], results:[https://logbooks.jlab.org/entry/3798622]
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<b>March 12th, 2020</b>
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Checked collimator 6 (2.95 vs 2.65). 
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summary: [https://logbooks.jlab.org/entry/3802667], result: [https://logbooks.jlab.org/entry/3802795]
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<b>August 3rd, 2020</b>
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Gain matched L/R.  High rates with no target and no collimators to start but operator tuned beam and the rates came down. 
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summary: [https://logbooks.jlab.org/entry/3819972], result: [https://logbooks.jlab.org/entry/3820234]
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<b>August 12th, 2020</b>
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Day shift operator had a lot of trouble tuning.  Then no beam for several hours (storms/RF), came back at 7pm.
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summary: [https://logbooks.jlab.org/entry/3825625], result: [https://logbooks.jlab.org/entry/3826006]
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<b>August 25th, 2020</b>
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<b>September 3rd, 2020</b>
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Measurement completed in 1/2 shift. :)
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Bleedthru@ 0.78%
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Summary:[https://logbooks.jlab.org/entry/3840128], result: [https://logbooks.jlab.org/entry/3840191]
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<b>September 11th, 2020</b>
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<b>September 16th, 2020</b>
  
 
==Table of good Moller runs==
 
==Table of good Moller runs==
Line 15: Line 82:
 
Date   Run Pol (%)  Error (%) Hwien Flip      Energy(MeV)    Comment
 
Date   Run Pol (%)  Error (%) Hwien Flip      Energy(MeV)    Comment
 
01/18/20
 
01/18/20
−
  1378 -85.76   0.96         -29.64 right      10.3857   Production IHWP OUT
+
  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
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</pre>
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==Table of Bleed Thru Runs==
 +
 
 +
<pre>
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Date    Run    Comment
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1/18    1373    40 Hz Coin (5 kHz at 0.8 uA)
 +
</pre>
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==Table of Tune Check Runs==
 +
 
 +
<pre>
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Date    Run    Comment
 +
1/18    1364    1294.6
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1/18    1365    1289.6
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1/18    1366    1284.6
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</pre>

Latest revision as of 13:02, 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.

Note on sign of polarization [1]

Hall A spin dance Jan. 07 th, 2020 [2]

December 12, 2019

Five pass commissioning. Used preliminary <azz>. Randoms were higher than expected. Need more shielding?. result: [3]

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:[4], Result: [5] Epics:[6]

January 18, 2020

Before this measurement, timed in randoms so that right arm comes exactly 16 ns after left. [7]. 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. [8] Settings: [9], BPMs: [10] summary: [11], result: [12]

January 27, 2020

Moller tune check and collimator settings[13].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:[14], summary [15], result: [16]

February 3, 2020

Spin Dance, summary: [17], result: [18]

February 12, 2020

Some troubles delivering beam. Tried to take the other IHWP state but ended up backing out. summary: [19], result: [20]

FLIP RIGHT (88.0) to FLIP LEFT (-90.6) February 17, 2020 ~10am

February 19, 2020

Energy change in injector starting Feb 18th: [21] Measurements corrected for Hall A bleedthru (57 Hz) summary: [22], result: [23]

February 27, 2020

Changed HVs: [24] Noisy BPMS/readbacks: [25] , Large coin rates with no target, no beam, no collimators. Bleedthru/Scraping notes: [26] summary: [27], result: [28]

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: [29], results:[30]

March 12th, 2020 Checked collimator 6 (2.95 vs 2.65). summary: [31], result: [32]

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: [33], result: [34]

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: [35], result: [36]

August 25th, 2020

September 3rd, 2020 Measurement completed in 1/2 shift. :) Bleedthru@ 0.78% Summary:[37], result: [38]

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
Retrieved from "https://hallcweb-2024.jlab.org/polwiki/index.php?title=Moller_Polarimeter/A1n/d2n&oldid=1709"