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    User name E.Chudakov

    Log entry time 07:01:30 on May 22, 2008

    Entry number 239181

    This entry is a followup to: 238294

    keyword=Moller results for Wien angle -33 and -13 degrees

    Results for 2008/05/16 and 2008/05/22

    The results are presented for:

    1. Wien=-33.7° taken at 2008/05/16
    2. Wien=-13.5° taken at 2008/05/22
    List of measurements
    Target Encoders (EPICS) Beam Runs Target Beam Comment
    X Y μA P P χ²
    Wien=-33.7°
    5 1.026 1.394 0.50μA 12784-12785 7.97% -68.3+/-0.4% 1.3 / 1
    4 1.656 1.389 0.50μA 12786,12789 7.44% -69.3+/-0.4% 0.8 / 1
    3 2.289 1.389 0.50μA 12790-12791 7.62% -66.7+/-0.3% 0.7 / 1
    2 2.930 1.387 0.30μA 12792-12793 8.21% -68.0+/-0.3% 3.7 / 1
    average 12784-12793 -67.9+/-0.2% 33 / 7
    Wien=-13.5°
    5 1.028 1.398 0.37μA 12800-12801 7.97% -84.32+/-0.4% 0.15 / 1
    4 1.656 1.398 0.37μA 12802-12803 7.44% -84.2+/-0.4% 1.8 / 1
    3 2.286 1.398 0.37μA 12804-12805 7.62% -81.5+/-0.3% 0.02 / 1
    2 2.930 1.392 0.17μA 12808-12809 8.21% -84.0+/-0.3% 3.3 / 1
    average 12800-12809 -83.3+/-0.2% 49 / 7
    3 2.286 1.398 0.37μA 12806-12807 7.62% Hall A laser off, Hall C 73μA, coinc. 0.05%

    Calculations of the precession assuming the linacs difference of 20 MeV and the average of 564.7 MeV, gives:

    From this, using the polarization of 67.9% at -33.7° we predict 83.1% at -13.5° which is very close to the measured value.

    A copy of this log entry has been emailed to: glamazdi@jlab.org, gorbenko@jlab.org, romanip@jlab.org



    Figure 1 Wien=-33.7



    Figure 2 Wien=-13.5