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]
 
[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
  
−
Set up like that:
+
 
 +
Set up like that:  
  
 
[[File:Detector1.png | 400px]]
 
[[File:Detector1.png | 400px]]
  
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the distance between PS and n's PMT is abot 80 cm
 
  
  
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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.
+
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.
 
{| 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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|-
 
|-
 
!PS1  
 
!PS1  
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| -1500|| -80|| 100
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| -1000|| -100|| 50
 
|-
 
|-
 
!PS1  
 
!PS1  
−
| -1500|| -80|| 100
+
| -1000|| -100|| 50
 
|-
 
|-
 
!n's  
 
!n's  
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'''Let's do first the coincidence test PS1+PS2'''
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'''First let's do the PS1+PS2 coincidence test'''.
 +
 
 +
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" |  
Line 45: Line 47:
 
|}
 
|}
  
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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>7513\pm86.5</math>||60 min||<math>2.09\pm0.02</math>
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|-
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!PS2
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|<math>9036\pm95.1</math>||60 min||<math>2.51\pm0.03</math>
 +
|-
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!PS1+PS2
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|<math>251\pm15.8</math>||60 min||<math>(6.9\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.png | 800px]]
 
  
  
 +
'''Second do the PS1+PS2+n's coincidence test '''
  
−
 
+
1. The distance between PS and n's PMT is about 80 cm
−
'''Let's do second the coincidence test PS1+PS2+n's'''
 
 
{| 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" |  
Line 70: Line 85:
 
|}
 
|}
  
 +
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;"
 +
! scope="col" width="50" |
 +
! scope="col" width="50" | counts
 +
! scope="col" width="50" | time
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! scope="col" width="50" | counts/sec
 +
|-
 +
!PS1
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|<math>7700\pm87.7</math>||60 min||<math>2.14\pm0.02</math>
 +
|-
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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]]
 
  
  
 +
The scope pictures of coincidence events looks like:
  
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The ratio 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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|[[File:Cosmic coinc PS1 PS2.png | 500px]] || [[File:Cosmic coinc PS1 PS2 n.png | 500px]]
 +
|}

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 2823±53.1 20 min 2.35±0.04
PS2 3091±55.6 20 min 2.58±0.05
PS1+PS2 93±9.6 20 min (7.7±0.8)⋅10−2

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

counts time counts/sec
PS1 7513±86.5 60 min 2.09±0.02
PS2 9036±95.1 60 min 2.51±0.03
PS1+PS2 251±15.8 60 min (6.9±0.4)⋅10−2


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 3229±56.8 20 min 2.69±0.05
PS2 3192±56.5 20 min 2.66±0.05
PS1+PS2+n's 59±7.7 20 min (4.9±0.6)⋅10−2

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

counts time counts/sec
PS1 7700±87.7 60 min 2.14±0.02
PS2 9060±95.2 60 min 2.52±0.03
PS1+PS2+n's 214±14.6 60 min (5.9±0.4)⋅10−2



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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