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]]
  
  
−
First I change the power supply for HAMAMATSU PMT to the new 2 channel one C.A.E.N N471
 
  
−
The powers are:
+
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;"
 +
! scope="col" width="50" |
 +
! scope="col" width="50" | PMT voltage, V
 +
! scope="col" width="50" | threshold, mV
 +
! scope="col" width="50" | 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
 +
{| 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>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
 +
{| 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>
 +
|}
  
−
PS1 and PS2:  -1000 V (the old 2-channel TENNELEC TC952)
 
−
n's: -1500 V (the new 2-channel C.A.E.N N471)
 
  
−
The thresholds are:
 
  
−
PS1 and PS2:  -80 mV
+
'''Second do the PS1+PS2+n's coincidence test '''
−
n's: -200 mV
 
  
 +
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;"
 +
! scope="col" width="50" |
 +
! scope="col" width="50" | counts
 +
! scope="col" width="50" | time
 +
! scope="col" width="50" | 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>
 +
|}
  
−
Let's do first the coincidence test PS1+PS2
+
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" |  
−
! scope="col" width="50" | counts/min (1 min test)
+
! scope="col" width="50" | counts
−
! scope="col" width="50" | counts/min (1 min test)
+
! scope="col" width="50" | time
−
! scope="col" width="50" | counts/min (5 min test)
+
! scope="col" width="50" | counts/sec
−
! scope="col" width="50" | counts/min (5 min test)
 
−
! scope="col" width="50" | avg counts/min
 
 
|-
 
|-
 
!PS1
 
!PS1
−
|187||160||166||160.8||'''168.4'''
+
|<math>7700\pm87.7</math>||60 min||<math>2.14\pm0.02</math>
 
|-
 
|-
 
!PS2
 
!PS2
−
|187||170||180.4||184.4||'''180.4'''
+
|<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:
 +
 
 +
{| border="0" cellspacing="0" style="text-align: center; width: 1050px; height: 100px;"
 +
! scope="col" width="50" |PS1+PS2 event looks like:
 +
! scope="col" width="50" |PS1+PS2+n event looks like:
 
|-
 
|-
−
!n's
+
|[[File:Cosmic coinc PS1 PS2.png | 500px]] || [[File:Cosmic coinc PS1 PS2 n.png | 500px]]
−
|205||204||201.2||202.4||'''203.2'''
 
 
|}
 
|}

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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