05/09/2011

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Revision as of 03:23, 10 May 2011 by Shaproma (talk | contribs)
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I did some counts test like:

Detector1.png


The powers were:

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

The PMT for n's detectors is PMT HAMAMATSU R580 with supply voltage 1250/1500 V. But I have used the value above, because I though the counts rate was reasonable. See my table below.

The thresholds were:

PS1 and PS2:  -80 mV
n's: -60 mV


Let see what we have. First is without CF-243 source:

counts/min counts/min counts/min
PS1 153 counts/min 170 counts/min
PS2 150 counts/min 173 counts/min
PS1+PS2 3.8 5.8 6.0
n's 358 counts/min


Second the CF-243 source is somewhere aside (40 - 60 cm away from detectors on the table):

counts/min counts/min counts/min
PS1 373 counts/min 362 counts/min
PS2 654 counts/min 656 counts/min
PS1+PS2 2.0 6.0
n's 358 counts/min 368 counts/min


Third the CF-243 source is on the top of PS1:

counts/min counts/min counts/min
PS1 364,570 counts/min 363,477 counts/min
PS2 19,832 counts/min 19.980 counts/min
PS1+PS2 993 959
n's 369 counts/min 352 counts/min