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    User name Rich Holmes

    Log entry time 19:22:07 on September 29,1998

    Entry number 1911

    keyword=HAPPEX DAQ intensity asymmetry

    Used the HAPPEX DAQ to look at helicity correlated beam intensity asymmetry.
    Samples taken at 30 Hz (i.e. 32 msec integration time, 30 times per helicity window).
    Beam current was 3 uA. Result from (HAPPEX) run 8019: asym = -0.368% +- 0.006%. RMS width = 0.42%. Looking at mean asymmetry versus "timeslot" (30 timeslots per helicity window) it appears the asymmetry is much smaller in the first timeslot (~0.1%) and fairly flat in the other 29.



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