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    User name Wolfgang, Xf. Zhu

    Log entry time 18:07:41 on September 4,2001

    Entry number 73332

    keyword=Target - EPR: 42.6%

    17:20 EPR P= 42.6%

    Target: Virginia-I@ polarized 3He position, beam off ,laser #5,6,7 on.
    Gradient coil: 2A longitudinal. 5A transverse

    0th order fit:
    freq1: -43.82 kHz +/- 2.07 kHz | Polarisation: 42.93 % +/- 2.03 %
    freq2: 43.02 kHz +/- 2.22 kHz | Polarisation: 42.14 % +/- 2.18 %
    1st order fit:
    freq1: -43.8 kHz +/- 2.03 kHz | Polarisation: 42.91 % +/- 1.99 %
    freq2: 43.26 kHz +/- 2.21 kHz | Polarisation: 42.38 % +/- 2.17 %


    17:31 EPR P= 41.8%

    Target: Virginia-I@ polarized 3He position, beam off ,laser #5,6,7 on.
    Gradient coil: 1.6A longitidinal. 5A transverse

    0th order fit
    freq1: -42.84 kHz +/- 2.34 kHz | Polarisation: 41.97 % +/- 2.29 %
    freq2: 42.32 kHz +/- 2.56 kHz | Polarisation: 41.45 % +/- 2.51 %

    1st order fit:
    freq1: -42.65 kHz +/- 2.41 kHz | Polarisation: 41.78 % +/- 2.36 %
    freq2: 42.9 kHz +/- 2.4 kHz | Polarisation: 42.03 % +/- 2.35 %

    Comments: Cooling jet flow: 13.8 l/min, Vmod = 1.00 V, good flips, a little
    noisy.

    Reduced long. grad coil currrent to 1.6 A to check the effect of
    energized HRS magnets on masing (note: cell position in pol. 3He this time).
    Did not see any masing at 1.6A, but polarization was 42% and not 45% as
    this morning. Still went back to 2.00 A to be safe.

    Why was polarization lower than this morning? Still recovering from
    target/radiation survey and pumping in transverse mode for most of the
    afternoon.