Difference between revisions of "Moller Polarimeter/Qweak"

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=====Jan. 21, 2011=====
 
=====Jan. 21, 2011=====
−
 
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==Spin dances==
 
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The initial Qweak Moller spin dance occurred November 23, 2010. Originally scheduled to coincide with Hall A, beam tune issues (on their end only) prevented a joint study.
 
−
 
−
Test setup: IHWP=OUT, QE=0.35%, Hallc:p 1159.66 MeV +/- 0.03. Solenoid at 3.5T, with 1 um foil.
 
−
The current was adjusted using the laser attenuator, slit was wide open. Quoted polarizations are
 
−
from the Dave G. scaler-bank-3-only analysis.
 
−
 
−
<pre>
 
−
Run  Wein    Polarization      Comments
 
−
508  -0.1    40.04 +/- 1.23    200 nA
 
−
509  -0.1    40.05 +/- 1.88    1.05 uA
 
−
510  -0.1    40.40 +/- 1.03    1 uA
 
−
511  -0.1    40.13 +/- 0.68    0.9 uA
 
−
512  -0.1    40.19 +/- 0.70    0.9 uA
 
−
513  -0.1    40.13 +/- 0.70    0.9 uA
 
−
514  -0.1    40.14 +/- 0.65    0.57 uA
 
−
515  -0.1    N/A (junk)        Hall C laser off - no Hall A bleedthrough
 
−
 
−
517  +29.0    -2.75 +/- 0.65    0.9 uA
 
−
518  +29.0    N/A                Hall C laser off
 
−
519  +29.0    -3.70 +/- 0.69    0.9 uA
 
−
520  +29.0    -3.48 +/- 0.68    0.9 uA
 
−
 
−
521  -31.0    75.85 +/- 0.88    0.9 uA
 
−
522  -31.0    76.81 +/- 0.69    0.9 uA
 
−
523  -31.0    75.61 +/- 0.69    0.9 uA
 
−
524  -31.0    75.50 +/- 1.25    0.9 uA
 
−
525  -31.0    74.54 +/- 0.96    0.9 uA
 
−
526  -31.0    75.37 +/- 0.67    0.9 uA
 
−
 
−
527  -75.0    87.89 +/- 0.70    0.9 uA
 
−
528  -75.0    87.63 +/- 0.69    0.9 uA
 
−
529  -75.0    86.69 +/- 0.69    0.9 uA
 
−
530  -75.0    86.83 +/- 0.79    0.9 uA
 
−
 
−
531  -63.20  88.64 +/- 0.74    0.9 uA
 
−
532  -63.20  89.65 +/- 1.12    0.9 uA
 
−
533  -63.20  90.32 +/- 0.69    0.9 uA
 
−
534  -63.20  89.51 +/- 0.68    0.9 uA
 
−
535  -63.20  89.73 +/- 1.90    0.9 uA
 
−
536  -63.20  90.04 +/- 0.91    0.9 uA
 
−
</pre>
 
−
 
−
The ideal horizontal wein angle was calculated to be -63.2 degrees. The measured polarization value at this wein was 89.62 +/- 0.35 (stat)%. Below the fit of polarization vs. Wein angle.
 
−
 
−
[[Image:Pol_vs_wein_dance1.gif|600px]]
 
−
 
−
The original hclog result entries are #208285 and #208394.
 

Revision as of 19:09, 6 April 2011

General Information

This is the spot for all things moller polarimetry. Information on how to take moller measurements, spin dance and polarimetry results, and system specs will eventually be put here. This page is currently under construction, and will be updated frequently in the upcoming weeks.

Preliminary results

Measurments for 2011

Last updated Feb. 22, 2011

Qweak pol 2011 april6.png

Measurments for 2010

Note: Measurement on "Day 39" low due to likely hardware issue.

Qweak pol 2010.png

Moller info for Qweak

  1. The Qweak Moller "how to" is officially up and ready for viewing. (version 1, updated jan. 26, 2011): Qweak Moller "How-To"
  2. The following is a plot showing good tune of the apparatus. It was taken from run 700, hallc:p ~ 1159 MeV, with a 1um target. (Jan. 30, 2011)

Moller plot jan30 2011.png

Table of good Moller runs

The following are runs made from straightforward moller test runs, not spin dances. Note, missing data can/will be added over time. The Nov. 14, 2010 commissioning run is NOT included. (we were messing with camac pre-scales, et cetera.) 

Date      Run 	  Polarization (%)  HW Plate  Wien (deg.)   HALLC:p(MeV)   QE(%)   Foil (um)  Current (uA)  Comments
1/21/11   686     -90.46 +/- 0.52   0 (IN)                  1159.82        0.32    1          1 
          687     -91.36 +/- 0.69   0 (IN)                  1159.82        0.32    1          1.5
          688     -90.60 +/- 0.67   0 (IN)                  1159.82        0.32    1          2.0
          689     -91.64 +/- 0.99   0 (IN)                  1159.82        0.32    1          1.5
          691     -91.28 +/- 1.43   0 (IN)                  1159.82        0.32    1          0.5
1/30/11   702     -90.07 +- 0.63	                    1159                   1          0.8           New HV L 1510V, R 1535V 
          703     -88.75 +- 1.31	                    1159                   1          0.8           New HV L 1510V, R 1535V  
          704     -90.48 +- 0.71                            1159                   1          0.8           New HV L 1510V, R 1535V 
          705     -89.84 +- 1.15                            1159                   1          0.8           Old HV L 1480V, R 1520V tripped at end
          706     -89.31 +- 1.09                            1159                   1          0.8           Old HV L 1480V, R 1520V tripped at end
          708     -89.37 +- 0.78                            1159                   1          0.8           Old HV L 1480V, R 1520V 
          709     -89.92 +- 1.50                            1159                   1          0.8           HV L 1530V, R 1555V
          710     -88.15 +- 0.72                            1159                   1          0.8           HV L 1610V, R 1655V
          711     -89.77 +- 0.72	                    1159                   1          0.8           HV L 1610V, R 1655V
          712     -88.08 +- 0.72	                    1159                   1          0.8           HV L 1610V, R 1655V
2/4/11    721     -88.37 +- 0.70    0 (IN)                  1159.76        0.637   1          0.96
          722     -88.94 +- 0.73    0 (IN)                  1159.76        0.637   1          0.96
          723     -89.14 +- 0.73    0 (IN)                  1159.76        0.637   1          0.96
          724      89.20 +- 0.70    1 (OUT)                 1159.76        0.637   1          0.96
          725      89.06 +- 0.73    1 (OUT)                 1159.76        0.637   1          0.96
          726      88.97 +- 0.73    1 (OUT)                 1159.76        0.637   1          0.96
2/7/11    737      89.09 +- 0.70    1 (OUT)                 1159.6         0.04192 1          1
          738      88.28 +- 0.73    1 (OUT)                 1159.6         0.04192 1          1
          739      88.81 +- 0.67    1 (OUT)                 1159.6         0.04192 1          1
          740     -86.99 +- 0.68    0 (IN)                  1159.6         0.04192 1          1
          741     -87.31 +-  0.7    0 (IN)                  1159.6         0.04192 1          1
          742     -88.52 +- 0.73    0 (IN)                  1159.6         0.04192 1          1             beam tripped
          743     -87.52 +- 0.73    0 (IN)                  1159.6         0.04192 1          1
2/8/11    747      88.46 +- 0.73    1 (OUT)                                        1                        charge asymmetry -128 ppm
          748      89.49 +- 0.73    1 (OUT)                                        1                        charge asymmetry -153 ppm
          749      87.47 +- 0.74    1 (OUT)                                        1                        charge asymmetry  94 ppm
          750      88.39 +- 0.73    1 (OUT)                                        1                        charge asymmetry -195 ppm
          751     -87.63 +- 0.65    0 (IN)                                         1                        charge asymmetry  1305 ppm
          752     -87.99 +- 0.81    0 (IN)                                         1                        charge asymmetry -1734 ppm
          753     -88.57 +- 0.69    0 (IN)                                         1                        charge asymmetry -300 ppm
          754     -88.10 +- 0.72    0 (IN)                                         1                        charge asymmetry -257 ppm
          755     -87.63 +- 1.12    0 (IN)                                         1                        charge asymmetry -234 ppm
2/14/11   803     -87/52 +- 0.69    1 (OUT)   -62.39        1159.61        0.1968  1 
          804     -89.58 +- 0.72    1 (OUT)   -62.39        1159.61        0.1968  1 
          805     -89.74 +- 0.77    1 (OUT)   -62.39        1159.61        0.1968  1                        beam trip
          806     -89.15 +- 0.72    1 (OUT)   -62.39        1159.61        0.1968  1 
          815      89.66 +- 0.73    0 (IN)    -62.39        1159.61        0.1968  1 
          816      88.94 +- 0.67    0 (IN)    -62.39        1159.61        0.1968  1 
          817      89.00 +- 0.70    0 (IN)    -62.39        1159.61        0.1968  1 
2/19/11   826     -89.24 +- 0.72    1 (OUT)   -62.39        1159.62                1                        tune funny prior to this run, recylced quads
          827     -88.76 +- 0.73    1 (OUT)   -62.39        1159.62                1 
          828     -88.78 +- 0.71    1 (OUT)   -62.39        1159.62                1 
          830      90.73 +- 1.40    0 (IN)    -62.39        1159.62                1                        large charge asymmetry  
          831      88.64 +- 0.99    0 (IN)    -62.39        1159.62                1 
          832      89.87 +- 0.72    0 (IN)    -62.39        1159.62                1 
          834      89.28 +- 0.72    0 (IN)    -62.39        1159.62                1 
          835      91.91 +- 0.69    0 (IN)    -62.39        1159.62                1 
          836      89.75 +- 1.35    0 (IN)    -62.39        1159.62                1 
2/22/11   842     -89.44 +- 0.73    1 (OUT)   -62.39        1159.73        0.3480  1                        Prescales at infinity and Q3=131A
          843     -89.61 +- 0.71    1 (OUT)   -62.39        1159.73        0.3480  1                        
          844     -89.24 +- 0.71    1 (OUT)   -62.39        1159.73        0.3480  1                        
          845     -88.92 +- 0.73    1 (OUT)   -62.39        1159.73        0.3480  1                        
          847      89.93 +- 0.73    0 (IN)    -62.39        1159.73        0.3480  1                        
          848      88.58 +- 0.73    0 (IN)    -62.39        1159.73        0.3480  1                        Moller ended early due to 2K cold box trip
2/24/11   868      87.99 +- 0.72    1 (OUT)   -62.39        1159.6         0.2545  1          0.8
          869      87.94 +- 0.79    1 (OUT)   -62.39        1159.6         0.2545  1          0.8           ~4e6e events
          870      88.62 +- 0.72    1 (OUT)   -62.39        1159.6         0.2545  1          0.8
          871     -89.47 +- 0.73    0 (IN)    -62.39        1159.6         0.2545  1          0.8
          872     -88.27 +- 0.96    0 (IN)    -62.39        1159.6         0.2545  1          0.8           ~2.9e6 events
          873     -90.62 +- 0.83    0 (IN)    -62.39        1159.6         0.2545  1          0.8           ~3.9e6 events
          874     -89.42 +- 0.74    0 (IN)    -62.39        1159.6         0.2545  1          0.8           ~4.8e6 events
3/18/11   878     -89.42 +- 0.71    0 (IN)    -62.39        1159.63                1          1.0
          879     -90.00 +- 0.71    0 (IN)    -62.39        1159.63                1          1.0
          880     -89.40 +- 0.69    0 (IN)    -62.39        1159.63                1          1.0
          881     -90.94 +- 1.46    0 (IN)    -62.39        1159.63                1          1.0
          882      89.48 +- 0.66    1 (OUT)   -62.39        1159.63                1          1.0           A_Q ~ 600 ppm
          883      89.46 +- 0.68    1 (OUT)   -62.39        1159.63                1          1.0           A_Q ~ 600 ppm
          884      89.05 +- 0.71    1 (OUT)   -62.39        1159.63                1          1.0           A_Q ~ 600 ppm
          886      90.52 +- 0.60    1 (OUT)   -62.39        1159.63                1          1.0
          887      89.93 +- 0.67    1 (OUT)   -62.39        1159.63                1          1.0
          888      89.76 +- 0.69    1 (OUT)   -62.39        1159.63                1          1.0
3/31/11   892      90.28 +- 0.61    1 (OUT)   -62.39        1159.57                1          1.0 Beam on target off. Adjusted after run. Aq ~ 100ppm
          893	   88.87 +- 0.73    1 (OUT)   -62.39        1159.57                1          1.0    	    Aq ~ 100ppm
          894	   90.41 +- 0.71    1 (OUT)   -62.39        1159.57                1          1.0    	    Aq ~ 100ppm	
          895	   88.31 +- 0.73    1 (OUT)   -62.39        1159.57                1          1.0    	    Aq ~ 100ppm
          896	   89.01 +- 0.73    1 (OUT)   -62.39        1159.57                1          1.0           Aq ~ 100ppm
          897	  -88.94 +- 0.74    0 (IN)    -62.39        1159.57                1          1.0           No changes - PC or RHWP Aq ~  -800ppm
          898	  -88.55 +- 0.74    0 (IN)    -62.39        1159.57                1          1.0           No changes - PC or RHWP Aq ~  -800ppm
          899	  -89.37 +- 0.72    0 (IN)    -62.39        1159.57                1          1.0           No changes - PC or RHWP Aq ~  -800ppm
          901	  -87.79 +- 0.70    0 (IN)    -62.39        1159.57                1          1.0           No changes - PC or RHWP Aq ~  -800ppm
          904	  -88.44 +- 1.67    0 (IN)    -62.39        1159.57                1          1.0           Aq~1000ppm. PC [+] 42990, PC [-] 41210
          905	  -87.43 +- 1.07    0 (IN)    -62.39        1159.57                1          1.0           Aq~-700ppm. PC [+] 43388, PC [-] 40811
          906	  -89.86 +- 0.73    0 (IN)    -62.39        1159.57                1          1.0           Aq~-300ppm. PC [+] 43588, PC [-] 40611
          907	  -89.79 +- 0.74    0 (IN)    -62.39        1159.57                1          1.0           Aq~-300ppm
          908	  -88.39 +- 0.74    0 (IN)    -62.39        1159.57                1          1.0           Aq~-300ppm
          909	  -89.76 +- 0.74    0 (IN)    -62.39        1159.57                1          1.0           Aq~-300ppm
4/4/11

Need to add data

4/6/11    934      89.87 +- 0.73    0 (IN)    -62.39        1159.6                 1          0.8
          935      90.76 +- 0.73    0 (IN)    -62.39        1159.6                 1          0.8
          936      89.11 +- 0.74    0 (IN)    -62.39        1159.6                 1          0.8
          937     -89.57 +- 0.73    1 (OUT)   -62.39        1159.6                 1          0.8
          938     -89.50 +- 0.68    1 (OUT)   -62.39        1159.6                 1          0.8
          939     -88.33 +- 0.73    1 (OUT)   -62.39        1159.6                 1          0.8

List of leakage checks 

Run   Date       Absolute rate (Hz)   Active halls   Comments
515   11/23/10   0                    A              we should double check this, if there is any nice retroactive way
518   11/23/10   0                    A
744   2/7/11     2
774   2/8/11     1-2                  B
819   2/14/11    1-2
8829  2/19/11    10                   A+B
846   2/22/11    5
889   3/18/11    2.7 (avg for 4-5 min)A              Hall A 5 uA
940   4/6/11     3                    A              Hall A ~4uA

List of good Moller spin dance runs (this can be combined with the above table, if desirable) The HWP column has a (L) for flipped left, and (R) for flipped right. 

Date      Run 	  Polarization (%)  HW Plate  Vert. Wien (deg.)   Horiz. Wien   HALLC:p(MeV)   QE(%)   Comments
11/23/10  508 c   +40.04 +/- 1.23   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 200 nA
          509  c  +40.05 +/- 1.88   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 1.05 uA
          510     +40.40 +/- 1.03   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 1 uA
          511     +40.13 +/- 0.68   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 0.9 uA
          512     +40.19 +/- 0.70   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 0.9 uA
          513     +40.13 +/- 0.70   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 0.9 uA
          514     +40.14 +/- 0.65   1 (OUT)    -0.1                             1159.66        0.35    1 um foil, 0.57 uA
          517     -2.75  +/- 0.65   1 (OUT)    +29.0                            1159.66        0.35    1 um foil, 0.9 uA
          519     -3.70  +/- 0.69   1 (OUT)    +29.0                            1159.66        0.35    1 um foil, 0.9 uA
          520     -3.48  +/- 0.68   1 (OUT)    +29.0                            1159.66        0.35    1 um foil, 0.9 uA
          521     +75.85 +/- 0.88   1 (OUT)    -31.0                            1159.66        0.35    1 um foil, 0.9 uA
          522     +76.81 +/- 0.69   1 (OUT)    -31.0                            1159.66        0.35    1 um foil, 0.9 uA
          523     +75.61 +/- 0.69   1 (OUT)    -31.0                            1159.66        0.35    1 um foil, 0.9 uA
          524     +75.50 +/- 1.25   1 (OUT)    -31.0                            1159.66        0.35    1 um foil, 0.9 uA
          525     +74.54 +/- 0.96   1 (OUT)    -31.0                            1159.66        0.35    1 um foil, 0.9 uA
          526     +75.37 +/- 0.67   1 (OUT)    -31.0                            1159.66        0.35    1 um foil, 0.9 uA
          527     +87.89 +/- 0.70   1 (OUT)    -75.0                            1159.66        0.35    1 um foil, 0.9 uA
          528     +87.63 +/- 0.69   1 (OUT)    -75.0                            1159.66        0.35    1 um foil, 0.9 uA
          529     +86.69 +/- 0.69   1 (OUT)    -75.0                            1159.66        0.35    1 um foil, 0.9 uA
          530     +86.83 +/- 0.79   1 (OUT)    -75.0                            1159.66        0.35    1 um foil, 0.9 uA
          531     +88.64 +/- 0.74   1 (OUT)    -63.0                            1159.66        0.35    1 um foil, 0.9 uA
          532     +89.65 +/- 1.12   1 (OUT)    -63.0                            1159.66        0.35    1 um foil, 0.9 uA
          533     +90.32 +/- 0.69   1 (OUT)    -63.0                            1159.66        0.35    1 um foil, 0.9 uA
          534     +89.51 +/- 0.68   1 (OUT)    -63.0                            1159.66        0.35    1 um foil, 0.9 uA
          535     +89.73 +/- 1.90   1 (OUT)    -63.0                            1159.66        0.35    1 um foil, 0.9 uA
          536     +90.04 +/- 0.91   1 (OUT)    -63.0                            1159.66        0.35    1 um foil, 0.9 uA
2/10/11   771     -85.92 +/- 4.22   1 (OUT)L   -63.22             87.10
          772     -90.36 +/- 0.73   1 (OUT)L   -63.22             87.10
          773     -88.62 +/- 0.73   1 (OUT)L   -63.22             87.10
          776     -73.81 +/- 0.74   1 (OUT)L   -30                87.10                                good (energy not reading back)
          777     -76.53 +/- 0.74   1 (OUT)L   -30                87.10                                good (energy not reading back)
          778     -75.89 +/- 0.75   1 (OUT)L   -30                87.10                                good (energy not reading back)
          779     -74.29 +/- 0.74   1 (OUT)L   -30                87.10                                good (energy not reading back)
          780     -76.13 +/- 0.92   1 (OUT)L   -30                87.10                                good (energy not reading back)
          781     -75.18 +/- 0.71   1 (OUT)L   -30                87.10                                good (energy reading back)
          782     -74.71 +/- 0.74   1 (OUT)L   -30                87.10                                good
          783     -41.87 +/- 0.73   1 (OUT)L   -1                 87.10                                good
          785     -42.10 +/- 0.74   1 (OUT)L   -1                 87.10                                good, 3c12 unstable
          786     -42.62 +/- 0.74   1 (OUT)L   -1                 87.10                                good, 3c12 unstable
          787     -77.27 +/- 0.72   1 (OUT)L   -90                87.10                                good, 3c12 unstable
          788     -76.99 +/- 0.73   1 (OUT)L   -90                87.10                                good, 3c12 unstable
          790     -77.44 +/- 0.74   1 (OUT)L   -90                87.10                                good
          791     -89.00 +/- 0.73   1 (OUT)L   -62.4              87.10                                good
          792     -89.76 +/- 0.82   1 (OUT)L   -62.4              87.10                                3c12 drifting
          793     -88.66 +/- 0.73   1 (OUT)L   -62.4              87.10                                3c12 drifting
          794     +88.92 +/- 0.73   0 (IN)L    -62.4              87.10                                large charge asymmetry ~1166ppm
          795     +90.77 +/- 2.74   0 (IN)L    -62.4              87.10                                charge asymmetry ~1052 ppm, Pockel's HV change
          796     +88.82 +/- 0.73   0 (IN)L    -62.4              87.10                                charge asymmetry ~ 379, good
          797     +87.87 +/- 0.73   0 (IN)L    -62.4              87.10                                good
          798     +89.93 +/- 0.73   0 (IN)L    -62.4              87.10                                good

Moller test summaries

This will be a sort of "Cliff Notes"section, that will summarize each test and link to the hclog and elog entries.


Jan. 30, 2011
Jan. 21, 2011
Retrieved from "https://hallcweb-2024.jlab.org/polwiki/index.php?title=Moller_Polarimeter/Qweak&oldid=543"