05/13/2011 coincidence test
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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: |
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