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    User name R. Michaels

    Log entry time 18:15:02 on June11,2005

    Entry number 145882

    keyword=T7 efficiency with waterfall

    From 1 million events of run 4509 with waterfall target, and taking
    into account the prescale factor for T5, I obtain an efficiency for
    T7 (aerogel-required coincidence trigger) of 98.5 +/- 1.0 % where
    the error is statistical only. This is MUCH better than it was last
    year ! It seems the aerogels and trigger are working very nicely.

    Note, see halog 145579 for a description of the method and limitations