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    User name Bob & Bodo

    Log entry time 11:17:21 on May27,2004

    Entry number 123337

    keyword=New definition of T7 !!

    Work done by Bob Michaels and Bodo Reitz

    Per Bogdan's request, T7 now requires the R-arm Cerenkov ("or" of
    10 PMTs). The Cerenkov-or is passed through a NIM discriminator
    at 100 mV. I don't know how many p.e. that is, but it looked
    very low on the scale of scope signals. This signal is made 160 nsec
    wide and after suitable delay arrives 70 nsec before T1 at the input
    to the coincidence unit that makes T7. This coinc. unit is set
    for triple coinc. To reverse this modification, one would simply
    unplug the Cerenkov-or and return to dual-coinc (i.e. T1.and.T6).

    T7 = T1.and.T6.and.R-arm-Cerenkov