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    User name alan nathan

    Log entry time 00:03:00 on January29,2002

    Entry number 81149

    keyword=veto efficiency scan

    rate in VV12 beam current run numbers Q
    0.5 MHz 2.5 uA 1811-12 9908 uC
    1.0 5.0 1813 6686
    1.5 7.5 1814 7058
    1.9 10.0 1815 9184
    2.5 14.0 1816 10680
    3.2 19.0 1817 9681


    Note the nonlinear behavior, suggesting a baseline shift due to the AC coupling at the discriminator..i.e., effective disc. level goes up (pedestal goes down and even negative) at high rates.