Moeller Polarimeter Raw Results Archives 2015

TILTED (low field) Moller Target

E12-06-114 DVCS: Measurements of the Electron-helicity Dependent Cross sections of the DVCS with CEBAF at 12 GeV

E12-07-108 GMp: Precision Measurement of the Proton Elastic Cross Section at High Q2

  • 8 March, 2015. 14:30 - 21:00 O.Glamazdin, R.Pomatsalyuk

    The beam energy is ~9573MeV(accel), 950.0MeV(linac), 107.2MeV(injector).
    Injector angle is 45.4o (88.1o, 0.0o flipper).
    IHWP wave plate was OUT. Passive HWP was OUT. Raster was ON.
    Q1=-256A, Q2=-241A, Q3=98.8A, Q4=283.0A, Dipole=450A.
    Helicity frequency=30Hz, delay=0 windows, pattern=Quartet.
    Runs 15679-15681 - detector HV tune.
    Runs 15683-15693 - detector threshould tune.
    Runs 15694-15702 - aperture detector study.
    Run 15703-15718 - beam polarization measurement with targets #5,4,3,2.
    15:40 - iocsofthamol (Moller target controller) was rebooted.
    19:15 - Moller dipole power supply was circled.
    19:05 - 20:10 No beam. Ask MCC to turn Hall A raster OFF.
    The Moller polarimeter optics study was stopped due to a problem with the Moller dipole power supply stability (ELOG 3324377).
    21:00 Moller target is parked, Moller target movement is unmasked. Moller dipole is OFF, quads settings are restored.

    The theta acceptance is about +/-4.6o and the mean analyzing power is 0.7707.
    The target angle is 19.95o. The error is statistical only. BPM01Y position is included
    Runs Target B.cur, uA Motor steps BOP Polarization % Chi2 Corrected Comments
    15703-15706 5 1.00 -61.7/0.0 8.0 81.67+/-0.32 1.0 81.43 -
    15707-15710 4 0.70 -151.9/0.0 8.0 79.78+/-0.33 0.3 79.52 -
    15711-15714 3 0.45 -239.0/0.0 8.0 78.21+/-0.31 2.8 78.00 -
    15715-15718 2 0.20 -328.8/0.0 8.0 82.55+/-0.33 1.9 82.29 -
    Average 2-5 - - 8.0 80.50+/-0.16 8.5 80.24 -

    The Moller Log Book scan is given here .
    The table with detailed information is given here and here .
    Plots with beam position and beam energy instability are: BPMs and Energy .
    For additional information see halog entry 3324391 .
    The final results:
    Pz=(80.24 +/- 0.16(stat) +/- 2.2(syst)) %
    The plot is given here .

  • 23-24 April, 2015. 19:30 - 4:00 O.Glamazdin, R.Pomatsalyuk

    The beam energy is 2056.42MeV(accel), 500.0MeV(linac), 56.42MeV(injector).
    Injector angle is -29.6o (-29.6o, 88.118,0 flipper).
    IHWP wave plate was OUT. Passive HWP was OUT. Raster was OFF.
    Q1=14.6A, Q2=81.7A, Q3=0A, Q4=22.3A, Dipole=112A.
    Helicity frequency=30Hz, delay=0 windows, pattern=Quartet.
    Runs 15732-15749 - detector HV and threshoulds tune.
    Runs 15750-15753 - beam polarization with target #5 (Q4=22.3A).
    Runs 15754-15768 - Q1 scan.
    Runs 15769-15781 - Q2 scan.
    Runs 15782-15791 - Q4 scan.
    Run 15792-15797 - beam polarization with target #5 (Q4=22.3A).
    Run 15798-15803 - beam polarization with target #5 (Q4=15.0A).
    Run 15804-15807 - beam polarization with target #4 (Q4=15.0A).
    3:45 Moller target is parked, Moller target movement is unmasked. Moller dipole is OFF, quads settings are restored.

    The theta acceptance is about +/-9.4o and the mean analyzing power is 0.7476.
    The target angle is 19.95o. The error is statistical only. BPM01Y position is included
    Runs Target B.cur, uA Motor steps BOP Polarization % Chi2 Corrected Comments
    15750-15753 5 0.55 -61.8/0.0 8.0 -90.24+/-0.20 0.4 -89.15 Q4=22.3A
    15792-15797 5 0.5 -61.8/0.0 8.0 -90.60+/-0.24 1.3 -89.52 Q4=22.3A
    15798-15803 5 0.55 -61.8/0.0 8.0 -88.53+/-0.22 0.8 -89.98 Q4=15.0A
    Average 5 - - 8.0 -89.78+/-0.13 - -89.52 -
    15804-15807 4 0.56 -150.8/0.0 8.0 -87.73+/-0.27 0.7 -88.99 Q4=15.0A
    Average 4-5 - - 8.0 -89.39+/-0.12 - -89.42 -
    Corrected - polarization with Levchuk effect and dead time correction.

    The Moller Log Book scan is given here .
    The table with detailed information is given here and here .
    Plots with beam position and beam energy instability are: BPMs and Energy .
    For additional information see halog entry 3334870 .
    The final results:
    Pz=(-89.42 +/- 0.12(stat) +/-2.2(stat)) %

  • 24 April, 2015. 19:00 - 24:00 O.Glamazdin, R.Pomatsalyuk

    The beam energy is 2056.42MeV(accel), 500.0MeV(linac), 56.42MeV(injector).
    Injector angle is -29.6o (-29.6o, 88.118,0 flipper).
    IHWP wave plate was OUT. Passive HWP was OUT. Raster was OFF.
    Q1=14.6A, Q2=81.7A, Q3=0A, Q4=24.2A, Dipole=112A.
    Helicity frequency=30Hz, delay=0 windows, pattern=Quartet.
    Runs 15810-15816 - Moller dipole scan.
    Runs 15817-15820 - beam polarization with target #5 (Q4=24.2A).
    Run 15821-15826 - beam polarization with target #5 (Q4=12.6A).
    Run 15827-15832 - dead time measurement target #5 (Q4=24.2A).
    0:30 Moller target is parked, Moller target movement is unmasked. Moller dipole is OFF, quads settings are restored.

    The theta acceptance is about +/-9.4o and the mean analyzing power is 0.7481.
    The target angle is 19.95o. The error is statistical only. BPM01Y position is included
    Runs Target B.cur, uA Motor steps BOP Polarization % Chi2 Corrected Comments
    15817-15820 5 0.43 -62.1/0.0 8.0 -89.78+/-0.16 6.5 -89.18 Q4=24.2A
    15821-15826 5 0.43 -62.1/0.0 8.0 -88.74+/-0.27 0.4 -92.25 Q4=12.6A
    Corrected - polarization with Levchuk effect and dead time correction.

    The Moller Log Book scan is given here .
    The table with detailed information is given here and here .
    Plots with beam position and beam energy instability are: BPMs and Energy .
    The final results:
    Pz=(-89.18 +/- 0.16(stat) +/- 2.2(stat)) %

    NEW HIGH FIELD (Temple University) Moller Target

  • 18-20 December, 2015. O.Glamazdin, R.Pomatsalyuk, W. Henry

    The beam energy is 11023.0/10985MeV(accel), 1090.0MeV(linac), 123.MeV(injector).
    Injector angle is +36.6o (0o, 0o flipper).
    IHWP wave plate was OUT. Passive HWP was OUT. Raster was OFF.
    Q1=-308.6A, Q2=-313.0A, Q3=84.0A, Q4=297.4A, Dipole=440A.
    Helicity frequency=30Hz, delay=0 windows, pattern=Quartet.
    20 December 6:39am
    Runs 15876-15877 - Target #2, 3T.
    Runs 15878-15881 - Target #3, 3T, detector configuration test.
    Runs 15881-15885 - beam polarization with Target #3, 3T.
    Runs 15886-15889 - beam polarization with Target #3, 4T.
    11:00 Moller target is parked, Moller target movement is unmasked. Moller dipole is OFF, quads settings are restored.

    The theta acceptance is about +/-3.7o and the mean analyzing power is 0.7730.
    Runs Target B.cur, uA Motor steps Field Polarization % Chi2 Corrected Comments
    15878-15885 3 1.0 -117.5/-0.196 3T -56.9+/-0.2 - -
    15821-15826 3 1.1 -117.5/-0.196 4T -59.4+/-0.2 - -

    The Moller Log Book scan is given here .
    The table with detailed information is given here and here .
    Plots with beam position and beam energy instability are: BPMs and Energy .
    For additional information see halog entry 3369006 and the Hall A weekly meeting presentation.