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    User name X. Zheng, W. Korsch

    Log entry time 20:52:40 on June18,2001

    Entry number 63718

    keyword=EPR measurement at 0 deg.

    We tried to do EPR at 180 deg after the access. Could not fine EPR signal,
    D2 was at ~ -172 mV with laser #6 on. Did not see any signal.
    Went back to 0 deg, signal was easy to find (> 20 muV), but signal could
    not be locked. PI feedback box electronics had to be readjusted.
    It turned out to be a VERY difficult job to find the correct relative
    and absolute gain settings. After several minutes, Xiaochao was able to
    find the correct settings (3 turns clockwise (starting from first "|" position)
    for relative and absolute gain). Great EPR signal.
    Unfortunately polarization dropped to about 25% due to several
    AFPs which were necessary to get EPR to work.

    Rotated field again to 180 deg, but Wolfgang could not find a signal.

    Result from EPR at 0 deg:
    -----------------

    1st order fit:

    P = 26.7 % +/- 0.54 %
    P = 24.5 % +/- 0.71 %

    0th order fit:

    P = 25.9 % +/- 0.59 %
    P = 25.0 % +/- 0.75 %