Difference between revisions of "05/13/2011 coincidence test"
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| Line 13: | Line 13: | ||
! scope="col" width="50" | PMT voltage, V | ! scope="col" width="50" | PMT voltage, V | ||
! scope="col" width="50" | threshold, mV | ! scope="col" width="50" | threshold, mV | ||
| + | ! scope="col" width="50" | discr. width, ns | ||
|- | |- | ||
!PS1 | !PS1 | ||
| − | | -1500|| -80 | + | | -1500|| -80|| 100 |
|- | |- | ||
!PS1 | !PS1 | ||
| − | | -1500|| -80 | + | | -1500|| -80|| 100 |
|- | |- | ||
!n's | !n's | ||
| − | | -1500|| -200 | + | | -1500|| -200|| 10 |
|} | |} | ||
| Line 41: | Line 42: | ||
|93<math>\pm</math>||20 min||<math>\pm</math> | |93<math>\pm</math>||20 min||<math>\pm</math> | ||
|} | |} | ||
| + | |||
| + | the scope picture of coincidence event like: | ||
Revision as of 21:44, 13 May 2011
Set up like that:
the distance between PS and n's PMT is abot 80 cm
The voltages and thresholds are as below. Note: I increased my thresholds for PS1 and PS2 from 80 mV up to 100 mV according to mu previous calibration threshold line.
| PMT voltage, V | threshold, mV | discr. width, ns | |
|---|---|---|---|
| PS1 | -1500 | -80 | 100 |
| PS1 | -1500 | -80 | 100 |
| n's | -1500 | -200 | 10 |
Let's do first the coincidence test PS1+PS2
| counts | time | counts/sec | |
|---|---|---|---|
| PS1 | 2823 | 20 min | |
| PS2 | 3091 | 20 min | |
| PS1+PS2 | 93 | 20 min |
the scope picture of coincidence event like: