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    User name Holmes

    Log entry time 12:53:12 on January 22,1999

    Entry number 9698

    Followups:

    keyword=Intensity asymmetry

    HAPPEX DAQ gave a value last night and this morning of about 3000 ppm for the beam intensity asymmetry -- similar values were seen by Moller. In the past hour or so Matt Poelker and Jacque Ludwig have adjusted the Pockels cell HV offset to reduce this asymmetry by about a factor of 10.

    This morning (HAPPEX run 8458):
    Intensity asymmetry = -2624+-6 ppm width = 1059 ppm
    x differences (BPM 3B) = 0.11 +- 0.05 microns width = 8.5 microns
    y differences (BPM 3B) = 0.07 +- 0.02 microns width = 3.3 microns
    Most recent (HAPPEX run 8466)
    Intensity asymmetry = -296+-11 ppm width = 830 ppm
    x differences (BPM 3B) = 0.11 +- 0.19 microns width = 15.0 microns
    y differences (BPM 3B) = -0.14 +- 0.10 microns width = 3.3 microns