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User name mcnulty
Log entry time 04:07:29 on August26,2009
Entry number 286053
keyword=preliminary Prex det pulse-height dists
We finally have good PREx detector test data. Pcture 1 shows preliminary pulse height distribution from run 4334--5uA on thin Ta target with Prex HRS optics tune and +0.7% dp/p. Beam energy is 1.204 GeV and angle is 14.0 deg. There are minimal/no clean-up cuts applied to this distribution--only 1 track and scintillator trigger events only.
This data is for the 1.0cm quartz (flat, not rotated by 45deg), with s0 in position.
55.4 channel MPV with 7.7 channel Gaussian sigma
From Jan 2008 beamtest (using same det configuration):
23.85 channel MPV with 5.9 channel sigma
Remarkable improvement after changing reflector material and shortening light guide.