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    User name X. Zheng

    Log entry time 04:51:48 on July 2,2001

    Entry number 65382

    keyword=Target - EPR - 38.2%

    4:31am: EPR during data taking, beam on
    gradient coil current L=-2.00A, T=5.00A

    Polarization:

    1st order fit:
    down: freq. shift = -46.08 KHz +/- 3.79 KHz, P = -38.27%+/- 3.15%
    up: freq. shift = 45.65 KHz +/- 4.04 KHz, P = 37.92%+/- 3.35%

    0th order fit:
    down: freq. shift = -45.89 KHz +/- 3.84 KHz, P = -38.12%+/- 3.19%
    up: freq. shift = 46.08 KHz +/- 4.40 KHz, P = 38.28%+/- 3.66%

    note: I furthur decreased rel. gain by about 0.4 turn to reduce the noise. So during
    the down flip I have to turn off integration. The circuit also cannot track the
    resonance during the up sweep. It finally went back to the original freq when I put
    modulation source to be 2.0 Vpp. For analysis we have something to fit, (and it is
    important to know where the system starts to sweep, where it starts to lock in, in one word, which point should we fit). but the spectrun looks really bad.

    Suggest next time use high mod. source amplitude (2.0Vpp?), but I am not sure. The system cannot track sweeps with 0.7Vpp.