Difference between revisions of "05/12/2011 2n correlation test"

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(Created page with '[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back] The powers are: PS1 and PS2: -1000 V (the old 2-channel TENNELEC TC952) n's: -1100 V (the new 2-chan…')
 
 
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[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
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[https://wiki.iac.isu.edu/index.php/Roman_measurements go back]
  
  
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The powers are:
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The voltages, thresholds and widths are:
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{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
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PS1 and PS2:  -1000 V (the old 2-channel TENNELEC TC952)
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! scope="col" width="50" |
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n's: -1100 V (the new 2-channel C.A.E.N N471)
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! scope="col" width="50" | PMT voltage, V
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! scope="col" width="50" | threshold, mV
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The thresholds are:
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! scope="col" width="50" | discr. width, ns
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|-
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PS1 and PS2:  -80 mV
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!PS1  
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n's: -200 mV
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| -1000|| -80|| 20
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|-
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The discriminator widths are:
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!PS1
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| -1000|| -80|| 10
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|}
  
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PS1: -20 ns
 
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PS2: -10 ns
 
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n's: -20 ns
 
  
  
 
Let's do the '''2n correlation test''' with CF252 source. The voltages and thresholds are the same.
 
Let's do the '''2n correlation test''' with CF252 source. The voltages and thresholds are the same.
 
First the set up is like:
 
First the set up is like:
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:PS1 and PS2 are parallel to each other and are faced to the source.
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:○ PS1 and PS2 are parallel to each other and are faced to the source.
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:the CF252 source in the middle
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:○ the CF252 source in the middle
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:the distance between PS1(PS2) and source is 6 cm
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:○ the distance between PS1(PS2) and source is 6 cm
  
 
The total number of events (2n fission events + random coincident) are:
 
The total number of events (2n fission events + random coincident) are:
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Second the set up is like:
 
Second the set up is like:
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:PS1 and PS2 are perpendicular to each other and are faced to the source.
+
:○ PS1 and PS2 are perpendicular to each other and are faced to the source.
−
:the CF252 source in the middle
+
:○ the CF252 source in the middle
−
:the distance between PS1(PS2) and source is 6 cm
+
:○ the distance between PS1(PS2) and source is 6 cm
  
 
The total number of events (2n fission events + random coincident) are:
 
The total number of events (2n fission events + random coincident) are:

Latest revision as of 19:01, 24 May 2012

go back


The voltages, thresholds and widths are:

PMT voltage, V threshold, mV discr. width, ns
PS1 -1000 -80 20
PS1 -1000 -80 10


Let's do the 2n correlation test with CF252 source. The voltages and thresholds are the same. First the set up is like:

○ PS1 and PS2 are parallel to each other and are faced to the source.
○ the CF252 source in the middle
○ the distance between PS1(PS2) and source is 6 cm

The total number of events (2n fission events + random coincident) are:

total counts time counts/min counts/sec
PS1 [math]255977\pm505.9[/math] 10 min [math]25597.7\pm50.6[/math] [math]426.63\pm0.84[/math]
PS1 [math]421917\pm649.5[/math] 10 min [math]42191.7\pm64.9[/math] [math]703.19\pm1.08[/math]
PS1+PS2 [math]1224\pm34.9[/math] 10 min [math]122.4\pm3.5[/math] [math]2.04\pm0.06[/math]


Second the set up is like:

○ PS1 and PS2 are perpendicular to each other and are faced to the source.
○ the CF252 source in the middle
○ the distance between PS1(PS2) and source is 6 cm

The total number of events (2n fission events + random coincident) are:

total counts time counts/min counts/sec
PS1 [math]250116\pm500.1[/math] 10 min [math]25011.6\pm50.0[/math] [math]416.86\pm0.83[/math]
PS1 [math]414774\pm644.0[/math] 10 min [math]64.4\pm64.9[/math] [math]691.29\pm1.07[/math]
PS1+PS2 [math]1359\pm36.9[/math] 10 min [math]135.9\pm3.7[/math] [math]2.26\pm0.06[/math]
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