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User name bogdanw
Log entry time 15:59:58 on April 18, 2008
Entry number 232902
keyword=HV setting of BB MWDC
The MWDC current vs HV (entry229433 and few other) was measured with 5
mkA on LH2 target. I fit these data with simple function C*exp(U[V]/134).
Present HV setting 1500 V is about 150 V below one used in GEN experiment.
Such 150 V lower HV corresponts do 3.1 times reduction of the MWDC gain.
The protons of interest have maximum momentum 350 MeV/c and dE/dx
larger then 1.5 GeV electrons by a factor of four.
So, we should expect full 100% efficiency of the MWDC for the protons of
interest at present 1500 V.
A copy of this log entry has been emailed to: doug@jlab.org, nilanga@jlab.org, lindgren@jlab.org