Difference between revisions of "05/13/2011 coincidence test"

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Revision as of 04:58, 14 May 2011

Go Back

Set up like that:

Detector1.png

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 my previous calibration threshold line.

PMT voltage, V threshold, mV discr. width, ns
PS1 -1000 -100 50
PS1 -1000 -100 50
n's -1500 -200 20



Let's do first the coincidence test PS1+PS2

counts time counts/sec
PS1 [math]2823\pm53.1[/math] 20 min [math]2.35\pm0.04[/math]
PS2 [math]3091\pm55.6[/math] 20 min [math]2.58\pm0.05[/math]
PS1+PS2 [math]93\pm9.6[/math] 20 min [math](7.7\pm0.8)\cdot 10^{-2}[/math]


The scope picture of PS1+PS2 coincidence event like:

Cosmic coinc PS1 PS2.png



Let's do second the coincidence test PS1+PS2+n's

counts time counts/sec
PS1 [math]3229\pm56.8[/math] 20 min [math]2.69\pm0.05[/math]
PS2 [math]3192\pm56.5[/math] 20 min [math]2.66\pm0.05[/math]
PS1+PS2+n's [math]59\pm7.7[/math] 20 min [math](4.9\pm0.6)\cdot 10^{-2}[/math]


The scope picture of PS1+PS2 coincidence event like:

Cosmic coinc PS1 PS2 n.png


The ratio of (PS+PS2) rate to (PS+PS2+n's) rate is

[math]\frac{7.7}{4.9} = 1.6[/math]