05/13/2011 coincidence test

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Set up like that:

the distance between PS and n's PMT is abot 80 cm

The voltages and thresholds are as below. Note: I increased my thresholds for PS1 and PS2 from 80 mV up to 100 mV according to mu previous calibration threshold line.

	PMT voltage, V	threshold, mV
PS1	[math]255977\pm505.9[/math]	10 min
PS1	[math]421917\pm649.5[/math]	10 min
PS1+PS2	[math]1224\pm34.9[/math]	10 min

▫ PS1 and PS2: -1000 V

▫ n's: -1500 V

The thresholds are:

▫ PS1 and PS2: -80 mV

▫ n's: -200 mV

Let's do first the coincidence test PS1+PS2

	counts	time	counts/sec
PS1
PS2
PS1+PS2