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    User name X. Zheng

    Log entry time 06:20:36 on September 4,2001

    Entry number 73315

    keyword=Target - EPR at gradient coil L=2.0A T=4.0A

    5:45am, set transverse gradient coil current 4.00A
    overall EPR conditions: Vmod=0.7Vpp, gradient coil current L=2.0A T=4.0A

    5:46am, EPR, freq 1/2 = 47.4/46.7 KHz, P1/2 = 46.4/45.7
    comments: adjusted abs gain before this measurement, spectrum looks very bad at the beginning. Then adjusted it again during flips, still not enough points at the lower state to do precise 1st order fit. So cannot conclude that the difference between f1 and f2 is due to masing. Also 0th order fit does not show masing.

    5:56am, EPR, freq 1/2 =45.4/44.8 KHz, P1/2 = 44.5/43.9
    comments: usually for two EPRs 10 minutes apart, freq1 of second measurement should be higher than freq2 of the first measurement, (but lower than freq1 of first one), since polarization can partially recover from AFP loss during this 10 minutes. But these two EPRs shows continuous loss (not just AFP). I assummed there is little masing. So I set transverse gradient coil back to 5.00A.

    Also this agrees with the result of gradient coil test on Sep.02, 6pm to 8pm (see target logbook page 17). To me it means the small change in left HRS angle does not affect masing threshould test much.

    6:12am, set transverse gradient coil back to 5.00A;

    next should find minimum current of longitudinal gradient coil at 8am.

    details on EPR:
    -*-*-*- 5:46am -*-*-*-
    1st order:
    down: freq. shift = -47.36 KHz +/- 2.26 KHz, P = -46.40%+/- 2.21%
    up: freq. shift = 46.67 KHz +/- 2.24 KHz, P = 45.72%+/- 2.19%
    0th order:
    down: freq. shift = -46.64 KHz +/- 2.28 KHz, P = -45.69%+/- 2.23%
    up: freq. shift = 46.52 KHz +/- 2.24 KHz, P = 45.57%+/- 2.19%
    ::::::::::::::
    AFP9_4_5_56am-polr1.dat
    ::::::::::::::
    down: freq. shift = -45.40 KHz +/- 1.54 KHz, P = -44.47%+/- 1.51%
    up: freq. shift = 44.77 KHz +/- 1.68 KHz, P = 43.85%+/- 1.64%
    ::::::::::::::
    AFP9_4_5_56am-polr.dat
    ::::::::::::::
    down: freq. shift = -45.97 KHz +/- 1.63 KHz, P = -45.03%+/- 1.59%
    up: freq. shift = 45.41 KHz +/- 1.73 KHz, P = 44.48%+/- 1.70%