05/10/2011

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continue...the same set up as before:

The distances are the same:

between PS1 and PS2: 8 cm
between PS1 and n's: 2.5 cm
between PS2 and n's: 1.5 cm
between PS1&2 and n's PMT: 80 cm

But now I am going to increase the power supply for HAMAMATSU, adjust threshold and see what happens.

The powers are:

PS1 and PS2:  -1000 V
n's: -1100 V

Let see what we have. First he CF-243 source is far far away (sealed in the safe):

	counts/min (1 min test)	counts/min (1 min test)	counts/min (5 min test)	counts/min (5 min test)	avg counts/min
PS1	153	170	132.4	143	149.6
PS2	150	173	175.6	157	163.9
PS1+PS2	3.8 (5 min test)	5.8 (5 min test)	5.8	4.4	4.95
n's	358		373.6	354.3	361.9