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

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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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! scope="col" width="50" |
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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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! scope="col" width="50" | discr. width, ns
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|-
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!PS1
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| -1000|| -80|| 20
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|-
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!PS1
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| -1000|| -80|| 10
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|}
  
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PS1 and PS2:  -1000 V (the old 2-channel TENNELEC TC952)
 
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n's: -1100 V (the new 2-channel C.A.E.N N471)
 
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The thresholds are:
 
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PS1 and PS2:  -80 mV
 
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n's: -200 mV
 
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The discriminator widths are:
 
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PS1: -20 ns
 
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PS2: -10 ns
 
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n's: -20 ns
 
  
  

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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