05/13/2011 coincidence test: Difference between revisions

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[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]




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[[File:Detector1.png | 400px]]
[[File:Detector1.png | 400px]]


the distance between PS and n's PMT is abot 80 cm




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'''First let's do the PS1+PS2 coincidence test'''
'''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" |  
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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;"
! scope="col" width="50" |
! scope="col" width="50" | counts
! scope="col" width="50" | time
! scope="col" width="50" | 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>
|}


The scope picture of PS1+PS2 coincidence event like:
[[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
'''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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|}
|}


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
! scope="col" width="50" | 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 picture of PS1+PS2 coincidence event like:


[[File:Cosmic coinc PS1 PS2 n.png | 800px]]




The scope pictures of coincidence events looks like:


The ratio of  (PS+PS2) rate to (PS+PS2+n's) rate is
{| border="0" cellspacing="0" style="text-align: center; width: 1050px; height: 100px;"
 
! scope="col" width="50" |PS1+PS2 event looks like:
<math>\frac{7.7}{4.9} = 1.6</math>
! scope="col" width="50" |PS1+PS2+n event looks like:
|-
|[[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:


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]\displaystyle{ 2823\pm53.1 }[/math] 20 min [math]\displaystyle{ 2.35\pm0.04 }[/math]
PS2 [math]\displaystyle{ 3091\pm55.6 }[/math] 20 min [math]\displaystyle{ 2.58\pm0.05 }[/math]
PS1+PS2 [math]\displaystyle{ 93\pm9.6 }[/math] 20 min [math]\displaystyle{ (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]\displaystyle{ 7513\pm86.5 }[/math] 60 min [math]\displaystyle{ 2.09\pm0.02 }[/math]
PS2 [math]\displaystyle{ 9036\pm95.1 }[/math] 60 min [math]\displaystyle{ 2.51\pm0.03 }[/math]
PS1+PS2 [math]\displaystyle{ 251\pm15.8 }[/math] 60 min [math]\displaystyle{ (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]\displaystyle{ 3229\pm56.8 }[/math] 20 min [math]\displaystyle{ 2.69\pm0.05 }[/math]
PS2 [math]\displaystyle{ 3192\pm56.5 }[/math] 20 min [math]\displaystyle{ 2.66\pm0.05 }[/math]
PS1+PS2+n's [math]\displaystyle{ 59\pm7.7 }[/math] 20 min [math]\displaystyle{ (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]\displaystyle{ 7700\pm87.7 }[/math] 60 min [math]\displaystyle{ 2.14\pm0.02 }[/math]
PS2 [math]\displaystyle{ 9060\pm95.2 }[/math] 60 min [math]\displaystyle{ 2.52\pm0.03 }[/math]
PS1+PS2+n's [math]\displaystyle{ 214\pm14.6 }[/math] 60 min [math]\displaystyle{ (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:
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