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User name miham
Log entry time 22:58:29 on April 16, 2009
Entry number 266980
keyword=Problem with channel dE-20LI was not able to see any "physical" signals in the channel dE-20L. The only thing that I was able to see were extremely big bogus pulses, that I believe were artificially produced by this PMT. I have increased the voltage on this PMT in few steps from -1426V to -1600V. (The current in this PMT is now 1121.1 uA) Now I believe that I see nice physical signals in this channel.
Blue line in the attached plots represent all excepted events in a given
channel. Red line shows events that have TDC values different from zero,
green line represents those events that have non-zero TDC values in both
(L and R) channels.
A copy of this log entry has been emailed to: miham@jlab.org, moffit@jlab.org, simon.sirca@fmf.uni-lj.si
dE-xxL ADC spectra before change
dE-xxR ADC spectra before change
dE-xxL ADC spectra after change
dE-xxR ADC spectra after change
