Difference between revisions of "05/12/2011"

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Let's do the '''random coincidence cosmic ray test'''. PS1 and PS2 is about 30 cm away from each other. And let's look on the coincidence signal between PS1 and PS2:
+
Let's do the '''random coincidence cosmic ray test'''.
 +
 
 +
PS1 and PS2 is about 30 cm away from each other. And let's look on the coincidence signal between PS1 and PS2:
 
{| 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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[[File:Rnd coinc cosmic.png | 800px]]
 
[[File:Rnd coinc cosmic.png | 800px]]
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 +
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Let's do the '''random coincidence cosmic ray test''' again.
 +
 +
But now the distance between PS1 and PS2 is about 5 cm. And let's look on the coincidence signal between PS1 and PS2:
 +
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 +
! scope="col" width="50" |
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! scope="col" width="50" | total counts
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! scope="col" width="50" | time
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! scope="col" width="50" | counts/min
 +
! scope="col" width="50" | counts/sec
 +
|-
 +
!PS1
 +
|<math>\pm101.2</math>||70 min||<math>146.4\pm1.44</math>||<math>2.44\pm0.02</math>
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|-
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!PS1
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|<math>\pm113.9</math>||70 min||<math>185.3\pm1.63</math>||<math>3.09\pm0.03</math>
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|-
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!PS1+PS2
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|<math>\pm1.7</math>||70 min||<math>0.043\pm0.024</math>||<math>0.0007\pm0.0004</math>
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|}
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 +
 +
  
  
  
 
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:
 
:PS1 and PS2 are parallel to each other and are faced to the source.
 
:PS1 and PS2 are parallel to each other and are faced to the source.

Latest revision as of 21:28, 12 May 2011

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The powers are:

PS1 and PS2:  -1000 V (the old 2-channel TENNELEC TC952)
n's: -1100 V (the new 2-channel C.A.E.N N471)

The thresholds are:

PS1 and PS2:  -80 mV
n's: -200 mV

The discriminator widths are:

PS1: -20 ns
PS2: -10 ns
n's: -20 ns


Let's do the random coincidence cosmic ray test.

PS1 and PS2 is about 30 cm away from each other. And let's look on the coincidence signal between PS1 and PS2:

total counts time counts/min counts/sec
PS1 [math]10247\pm101.2[/math] 70 min [math]146.4\pm1.44[/math] [math]2.44\pm0.02[/math]
PS1 [math]12969\pm113.9[/math] 70 min [math]185.3\pm1.63[/math] [math]3.09\pm0.03[/math]
PS1+PS2 [math]3\pm1.7[/math] 70 min [math]0.043\pm0.024[/math] [math]0.0007\pm0.0004[/math]


And below my scope pictures of this rear event:

Rnd coinc cosmic.png


Let's do the random coincidence cosmic ray test again.

But now the distance between PS1 and PS2 is about 5 cm. And let's look on the coincidence signal between PS1 and PS2:

total counts time counts/min counts/sec
PS1 [math]\pm101.2[/math] 70 min [math]146.4\pm1.44[/math] [math]2.44\pm0.02[/math]
PS1 [math]\pm113.9[/math] 70 min [math]185.3\pm1.63[/math] [math]3.09\pm0.03[/math]
PS1+PS2 [math]\pm1.7[/math] 70 min [math]0.043\pm0.024[/math] [math]0.0007\pm0.0004[/math]




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]