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

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Line 13: Line 13:
 
! scope="col" width="50" | PMT voltage, V
 
! scope="col" width="50" | PMT voltage, V
 
! scope="col" width="50" | threshold, mV
 
! scope="col" width="50" | threshold, mV
 +
! scope="col" width="50" | discr. width, ns
 
|-
 
|-
 
!PS1  
 
!PS1  
−
| -1500|| -80
+
| -1500|| -80|| 100
 
|-
 
|-
 
!PS1  
 
!PS1  
−
| -1500|| -80
+
| -1500|| -80|| 100
 
|-
 
|-
 
!n's  
 
!n's  
−
| -1500|| -200  
+
| -1500|| -200||  10
 
|}
 
|}
  
Line 41: Line 42:
 
|93<math>\pm</math>||20 min||<math>\pm</math>
 
|93<math>\pm</math>||20 min||<math>\pm</math>
 
|}
 
|}
 +
 +
the scope picture of coincidence event like:

Revision as of 21:44, 13 May 2011

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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 mu previous calibration threshold line.

PMT voltage, V threshold, mV discr. width, ns
PS1 -1500 -80 100
PS1 -1500 -80 100
n's -1500 -200 10


Let's do first the coincidence test PS1+PS2

counts time counts/sec
PS1 2823[math]\pm[/math] 20 min [math]\pm[/math]
PS2 3091[math]\pm[/math] 20 min [math]\pm[/math]
PS1+PS2 93[math]\pm[/math] 20 min [math]\pm[/math]

the scope picture of coincidence event like:

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