MAPMT Calibration

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MAPMT Calibration Paul Karchin Alfredo
Gutierrez, WSU, 4/2/04
16 channel MAPMT HV 950 volts 10 ns base
width red LED pulse clear fiber from LED to
MAPMT translucent plastic optical filter over
MAPMT face 80 ns ADC gate centered on LED
pulse DAQ rate of order 1 Khz
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A few seconds of data for a single MAPMT channel
This looks like a (smeared) Poisson distribution!
Prob(0) sum(pedestal)/sum(pedsignal) ltNpegt
-ln Prob(0) 0.69
ltQgt ltNpegt e
PMT Gain
18 X 106
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Data for channel 15 - the highest gain channel
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MAPMT channel 10 - the lowest gain and also a
typical channel
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Data for channel 10 - the lowest gain and also a
typical channel