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] | ||
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Set up like that: | Set up like that: | ||
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'''First let's do the PS1+PS2 coincidence test'''. | '''First let's do the PS1+PS2 coincidence test'''. | ||
− | The distance between PS and n's PMT is about 80 cm | + | |
+ | 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;" | {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;" | ||
! scope="col" width="50" | | ! scope="col" width="50" | | ||
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|} | |} | ||
− | The distance between PS and n's PMT is about 50 cm | + | 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" | | ||
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+ | '''Second do the PS1+PS2+n's coincidence test ''' | ||
− | The | + | 1. The distance between PS and n's PMT is about 80 cm |
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{| 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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|} | |} | ||
+ | 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>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> | ||
+ | |} | ||
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− | |||
+ | 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: | |
+ | |- | ||
+ | |[[File:Cosmic coinc PS1 PS2.png | 500px]] || [[File:Cosmic coinc PS1 PS2 n.png | 500px]] | ||
+ | |} |
Latest revision as of 17:27, 16 May 2011
Set up like that:
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 | 20 min | ||
PS2 | 20 min | ||
PS1+PS2 | 20 min |
2. The distance between PS and n's PMT is about 50 cm
counts | time | counts/sec | |
---|---|---|---|
PS1 | 60 min | ||
PS2 | 60 min | ||
PS1+PS2 | 60 min |
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 | 20 min | ||
PS2 | 20 min | ||
PS1+PS2+n's | 20 min |
2. The distance between PS and n's PMT is about 50 cm
counts | time | counts/sec | |
---|---|---|---|
PS1 | 60 min | ||
PS2 | 60 min | ||
PS1+PS2+n's | 60 min |
The scope pictures of coincidence events looks like:
PS1+PS2 event looks like: | PS1+PS2+n event looks like: |
---|---|