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User name S. Sirca
Log entry time 23:48:34 on April29,2008
Entry number 235870
keyword=Change in HRSL Cerenkov ADC 6
Starting with run 4401, the upper limit of the ADC 6 signal
of the HRSL Cerenkov as seen by the online replay tools has
shrunk from about channel 3000 to about channel 2500.
(Can not attach figure because the golden run has changed
for the new kinematics.) This was at the time of the HV
problems on the HRSL (see HALOG entry 235856). The high
voltages recorded prior to the card swap and crate reset
and the present voltages for that particular channel agree though.
In effect, the Cerenkov ADC 6 spectrum has shrunk as if the
amplification has changed; the PMT voltage, however, is the same
as it was before.