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

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[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
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Set up like that:  
 
Set up like that:  
  
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'''First let's do the PS1+PS2 coincidence test'''.
 
'''First let's do the PS1+PS2 coincidence test'''.
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The distance between PS and n's PMT is about 80 cm  
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1. The distance between PS and n's PMT is about 80 cm  
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
! scope="col" width="50" |  
 
! scope="col" width="50" |  
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|}
 
|}
  
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The distance between PS and n's PMT is about 50 cm  
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2. The distance between PS and n's PMT is about 50 cm  
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
! scope="col" width="50" |  
 
! scope="col" width="50" |  
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'''Second do the PS1+PS2+n's coincidence test '''
  
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The scope picture of PS1+PS2 coincidence event like:
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1. The distance between PS and n's PMT is about 80 cm
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[[File:Cosmic coinc PS1 PS2.png | 800px]]
 
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'''Second tet's do the PS1+PS2+n's coincidence test '''
 
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
! scope="col" width="50" |  
 
! scope="col" width="50" |  
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|}
 
|}
  
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2. The distance between PS and n's PMT is about 50 cm
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{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
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! scope="col" width="50" |
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! scope="col" width="50" | counts
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! scope="col" width="50" | time
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! scope="col" width="50" | counts/sec
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|-
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!PS1
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|<math>7700\pm87.7</math>||60 min||<math>2.14\pm0.02</math>
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|-
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!PS2
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|<math>9060\pm95.2</math>||60 min||<math>2.52\pm0.03</math>
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|-
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!PS1+PS2+n's
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|<math>214\pm14.6</math>||60 min||<math>(5.9\pm0.4)\cdot 10^{-2}</math>
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|}
  
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The scope picture of PS1+PS2 coincidence event like:
 
  
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[[File:Cosmic coinc PS1 PS2 n.png | 800px]]
 
  
  
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The scope pictures of coincidence events looks like:
  
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The ratio of  (PS+PS2) rate to (PS+PS2+n's) rate is
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{| border="0" cellspacing="0" style="text-align: center; width: 1050px; height: 100px;"
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! scope="col" width="50" |PS1+PS2 event looks like:
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<math>\frac{7.7}{4.9} = 1.6</math>
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! scope="col" width="50" |PS1+PS2+n event looks like:
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|-
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|[[File:Cosmic coinc PS1 PS2.png | 500px]] || [[File:Cosmic coinc PS1 PS2 n.png | 500px]]
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|}

Latest revision as of 17:27, 16 May 2011

Go Back


Set up like that:

Detector1.png


The voltages, thresholds and widths 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 10



First let's do the PS1+PS2 coincidence test.

1. The distance between PS and n's PMT is about 80 cm

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]

2. The distance between PS and n's PMT is about 50 cm

counts time counts/sec
PS1 [math]7513\pm86.5[/math] 60 min [math]2.09\pm0.02[/math]
PS2 [math]9036\pm95.1[/math] 60 min [math]2.51\pm0.03[/math]
PS1+PS2 [math]251\pm15.8[/math] 60 min [math](6.9\pm0.4)\cdot 10^{-2}[/math]


Second do the PS1+PS2+n's coincidence test

1. The distance between PS and n's PMT is about 80 cm

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]

2. The distance between PS and n's PMT is about 50 cm

counts time counts/sec
PS1 [math]7700\pm87.7[/math] 60 min [math]2.14\pm0.02[/math]
PS2 [math]9060\pm95.2[/math] 60 min [math]2.52\pm0.03[/math]
PS1+PS2+n's [math]214\pm14.6[/math] 60 min [math](5.9\pm0.4)\cdot 10^{-2}[/math]



The scope pictures of coincidence events looks like:

PS1+PS2 event looks like: PS1+PS2+n event looks like:
Cosmic coinc PS1 PS2.png Cosmic coinc PS1 PS2 n.png
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