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    User name X. Zheng

    Log entry time 12:23:46 on September 6,2001

    Entry number 73612

    keyword=Target - EPR 41% and 1 laser trials

    10:51, turn on laser #6 for EPR

    10:55, EPR with laser #6, Vmod = 1.1V, RF 16.0V, decrease rel/abs gains by 0.5 turn
    did 2 sweeps, P1 = 40.82%, P2 = 41.32%
    comments: large error bar

    11:00 ,turn on lasers #5 and #7 to pump up

    11:17am, 3rd trial, Vmod = 1.0V, RF 16.0V, adjusted gains, did 1 sweep, error bar is smaller, P = 39.51% +/- 1.5%

    11:30am, MCC called they are ready to deliver beam;

    11:33am, 4th trial, same conditions, but decreased rel.gain by 0.2 turn, error bar became worse, P = 37.5% +/- 2.7%;

    11:36am, turn off laser #6, move target to pol 3He cell position, rotate field from 0 to 270 degrees; EPR gains are 0.5/0.2 turn smaller than original setting;

    11:40am, field rotation complete, turn on lasers #1, #2 and #4.

    Note: polarization here is calculated by assumptions on target temperature, roughly:

    lasers..cooling jet..Tpump..Ttarg..deltaNu(Hz)/P..calibration
    ...3.....OFF.....236.....53....51041.83.....0.9796
    ...3.....ON.......236.....42....50143.55.....0.9971
    ...1.....OFF.....190.....53....50103.81.....0.9979
    ...1.....ON.......190.....42....49262.02.....1.01498

    Now using polarization = freq shift(KHz, from fit program) * 1.01498


    details on EPR data:
    ::::::::::::::::
    AFP9_6_10_55am-polr1.dat
    ::::::::::::::
    down: freq. shift = -39.09 KHz +/- 2.30 KHz, P = -39.67%+/- 2.34%
    up: freq. shift = 41.36 KHz +/- 2.50 KHz, P = 41.98%+/- 2.54%
    down: freq. shift = -40.87 KHz +/- 2.93 KHz, P = -41.48%+/- 2.97%
    up: freq. shift = 40.54 KHz +/- 2.75 KHz, P = 41.15%+/- 2.79%
    ::::::::::::::
    AFP9_6_11_17am-polr1.dat
    ::::::::::::::
    down: freq. shift = -39.42 KHz +/- 1.44 KHz, P = -40.01%+/- 1.46%
    up: freq. shift = 38.44 KHz +/- 1.60 KHz, P = 39.02%+/- 1.63%
    ::::::::::::::
    AFP9_6_11_33am-polr1.dat
    ::::::::::::::
    down: freq. shift = -35.88 KHz +/- 2.69 KHz, P = -36.41%+/- 2.73%
    up: freq. shift = 38.01 KHz +/- 2.63 KHz, P = 38.58%+/- 2.67%