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;"
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! 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
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! scope="col" width="50" | counts/sec
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|-
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!PS1
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|<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]
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