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    User name brads

    Log entry time 16:03:48 on November 18, 2008

    Entry number 249569

    This entry is a followup to: 249402

    keyword=BB Cerenkov witness PMT rates with front shielding

    Bottom line: It's no better, might be worse.

    Beam current: 12 uA
    107. kHz T1 rate
    1.4 kHz T3 rate
    0.054 kHz T5 rate
    23.0 kHz T6 rate

    Started 3:40pm, Tuesday, run 3637
    T7 rates w/ all HVs off (ie. EDTM pulser only, same as T2 rate)
    Thresh Rate (Hz)
    -100 12.48
    -300 12.48
    -500 12.48
    -700 12.48
    -750 12.48
    -800 0
    -900 0

    ### This is with the 1" of Al plate in front
    T7 rates w/ HV on 19 on (witness PMT @ 2100V); 12 uA beam
    Thresh Rate (kHz)
    -100 192.
    -300 54.4 (~600 Hz, during trip)
    -500 19.1
    -700 13.0
    -900 9.8
    Done 3:44pm, Tuesday, run 3637

    ### This is the old (unshielded) run
    T7 rates w/ HV on 19 on (witness PMT @ 2100V); 11.8 uA beam
    Thresh Rate (kHz)
    -100 168.
    -300 48.6
    -500 17.6
    -700 11.8
    -900 8.8



    A copy of this log entry has been emailed to: meziani