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    User name A. Kolarkar

    Log entry time 04:59:15 on March 10, 2006

    Entry number 166086

    Followups:

    keyword=Target: next set of EPR-NMR calibrations for Dolly

    During the 0100 Hall access, did another calibration. The temperature was at 255 °C. 85Rb was quite small and sitting on a huge cable resonance; could not find 87Rb - another huge resonance in its lieu. Then found 39K around 20.37 MHz and locked to it. EPR was noisy but successful. Calibration results:

    First two-coil NMR: x/up = 79.26 mV ; x/dn = 78.45 mV

    K-EPR:

    falling edge ≡ 38.307%

    rising edge ≡ 37.616%

    Second two-coil NMR: x/up = 77.82 mV ; x/dn = 77.07 mV

    Without correcting for AFP losses (as was done earlier), the following constants were obtained:

    c1 = 0.4883 %/mV (associated with the falling EPR edge)

    c2 = 0.4834 %/mV (associated with the rising EPR edge)

    Average calibration constant : c = 0.486 %/mV

    Avg. target polarization at ~ 0200 with EPR = (38.1 ± 0.5) %.