05/13/2011 timing test
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Set up like that:
The voltages, thresholds and widths are:
| PMT voltage, V | threshold, mV | discr. width, ns | |
|---|---|---|---|
| PS1 | -1000 | -80 | 50 |
| PS1 | -1000 | -80 | 50 |
| n's | -1500 | -200 | 10 |
Let's do the timing test. The distances are between PS1+PS2 and n's PMT. The time is time difference between PS1(PS2) and n's detector signals
As the distance becomes 10 cm and less the coincidence rate becomes very low. I have:
- ▫ 11 coincidence for 98 min (10 cm)
- ▫ 0 coincidence for 10 min
Below is the plot of measured time as function of distances:
