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

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'''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  
 
'''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  
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[[File:Tbl timing 03.png | 800px]]
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{| border="1" cellspacing="0" style="text-align: center; width: 1000px; height: 100px;"
 
{| border="1" cellspacing="0" style="text-align: center; width: 1000px; height: 100px;"
 
! scope="col" width="50" | N  
 
! scope="col" width="50" | N  
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Below is the plot of measured time as function of distances:
 
Below is the plot of measured time as function of distances:
  
[[File:Timing 01.png | 800px]]
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[[File:Timing 03.png | 800px]]

Revision as of 03:47, 17 May 2011

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Set up like that:

Detector1.png


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

Tbl timing 03.png

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:

▫ 11 coincidence for 98 min (10 cm)
▫ 0 coincidence for 10 min


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

Timing 03.png