Moller Polarimeter/Qweak
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
Measurments for 2010
Note: Measurement on "Day 39" low due to likely hardware issue.
Moller info for Qweak
- The Qweak Moller "how to" is officially up and ready for viewing. (version 1, updated jan. 26, 2011): Qweak Moller "How-To"
- 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 measurement summaries
This will be a sort of "Cliff Notes"section, that will summarize each test and link to the hclog and elog entries.
Apr. 15, 2011 Slit studies and regular measurement.hc-log summary hc-log plots e-log summary
Apr. 13, 2011 Slit studies and regular measurement. The quad tuning was painful - mcc re-cycled the quads 3-4x. hclog-results hclog-slit test e-log summary
Apr. 11, 2011 Regular measurement - polarization increased from the 11th, but not quite noraml. (~86%) hclog e-log summary
Apr. 8, 2011 Changed MPS to 100us. Polarization abnormally low. (~85%) The MPS change appeared to not be the cause. hclog
Apr. 6, 2011 Regular measurement. Measurement 1% better than from same spot on the 4th. hclog elog
Apr. 4, 2011 Shifted beam left by 0.5mm to see effect of polarization. hclog elog
Mar. 31, 2011 Study of charge asymmetry on polarization. Used "old" method of just changing the PITA voltages. Some difference, but inconclusive. hclog elog
Mar. 18, 2011 Study of charge asymmetry effect on polarization. hclog elog
Feb. 24, 2011 Regular measurement. Noticed bug in "calc_bpol_byquartet". hclog elog
Feb. 22, 2011 Final run disrupted by cryo events. hclog elog
Feb. 19, 2011 Results outside of statistical error. Tune and rates a little odd at first. After cycling Q3 again, rate=17 kHz/uA. hclog
Feb. 10, 2011 Spin dance. Position of 3c12 visibly wandered. hclog summary hclog pol. measurement elog
Feb. 8, 2011 Measurement of vertical polarization (spin rotator off) ~-0.60. hclog
Feb. 7, 2011 Checked HV - looked good, and then measurement. Several beam trips. hclog elog
Feb. 4, 2011 Measurement, good beam. hclog summary (no plots) elog (with plots)
Jan. 30, 2011 Checked HV, rates, and re-did a collimator scan. hclog hclog plots elog (also with plots) collimator scan (with spreadsheet)
Jan. 21, 2011 Straightforward measurement. Good backgrounds. hclog
Dec. 14, 2010 Background studies. Tweaked HV, looked at collimator 5. hclog
Dec. 10,2010 Verified timing for the main coincidences and accidentals. hclog
Dec. 9, 2010 Scaler coincidence and accidental measurements elog
Dec. 6, 2010
- Rate and current dependence studies. hclog elog
- Quad tune test. hclog summary
- Rate and current dependence studies. hclog elog
Dec. 4, 2010 Moller solenoid field scan for foil misalignment. Solenoid field at 3.75 self inconsistent. hclog elog
Nov. 23, 2010 Spin dance. hclog summary elog (duplicate)
Nov. 14, 2010 Commissioning! Gain matched calorimeters and scintillator HV. Optimized quad tunes, some collimator studies, and made some measurements. hclog
Also: an hclog note on moller backgrounds sensitive to beam position near raster. (Dec. 4, 2010)
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
