Difference between revisions of "05/13/2011 timing test"

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!PS1  
 
!PS1  
| -1500|| -80|| 100
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| -1000|| -80|| 100
 
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!PS1  
 
!PS1  
| -1500|| -80|| 100
+
| -1000|| -80|| 100
 
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!n's  
 
!n's  

Revision as of 04:39, 14 May 2011

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Set up like that:

Detector1.png


The voltages and thresholds are:

PMT voltage, V threshold, mV discr. width, ns
PS1 -1000 -80 100
PS1 -1000 -80 100
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

N 80 cm 70 cm 60 cm 50 cm 40 cm 30 cm 20 cm 15 cm 10 cm 0 cm
1 17.6 ns 16.8 ns 16.4 ns 12.8 ns 14.0 ns 12.8 ns 14.4 ns 12.4 ns 11.2 ns
2 17.6 ns 16.8 ns 16.8 ns 19.2 ns 14.2 ns 14.4 ns 13.6 ns 12.0 ns
3 18.4 ns 17.6 ns 18.4 ns 17.6 ns 15.2 ns 16.8 ns 13.2 ns 11.2 ns
4 17.6 ns 17.0 ns 17.6 ns 16.8 ns 18.6 ns 14.4 ns 14.4 ns 10.0 ns
5 17.6 ns 17.0 ns 17.6 ns 16.8 ns 16.0 ns 14.0 ns 13.6 ns 10.0 ns
6 17.6 ns 17.2 ns 16.4 ns 16.8 ns 17.6 ns 15.2 ns 12.4 ns 11.2 ns
7 18.0 ns 18.4 ns 17.6 ns 16.0 ns 15.2 ns 13.2 ns 12.8 ns 12.0 ns
8 16.8 ns 20.8 ns 16.0 ns 17.2 ns 17.2 ns 14.4 ns 12.8 ns 12.8 ns
9 9.6 ns 17.6 ns 16.4 ns 17.2 ns 18.4 ns 17.2 ns 15.2 ns 14.6 ns
10 17.2 ns 22.4 ns 18.4 ns 17.2 ns 16.0 ns 16.4 ns 12.8 ns 12.0 ns
avg, ns (16.8 ± 2.6) (18.2 ± 1.9) (17.2 ± 0.9) (16.8 ± 1.6) (16.2 ± 1.6) (14.9 ± 1.5) (13.5 ± 0.9) (11.8 ± 1.4)


As the distance becomes 10 cm and less the coincidence rate becomes very low. I have:

▫ 1 coincidence for 10 min
▫ 0 coincidence for 10 min


Below is the plot of measured time as function of distances:

Timing 01.png