View source for 05/13/2011 coincidence rate test (PS1+PS2 and PS1+PS2+Det1)

[https://wiki.iac.isu.edu/index.php/Roman_measurements go back]


Set up like that: 

[[File:Detector1.png | 400px]]



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.
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
! scope="col" width="50" |
! scope="col" width="50" | PMT voltage, V
! scope="col" width="50" | threshold, mV
! scope="col" width="50" | 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 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
! scope="col" width="50" | 
! scope="col" width="50" | counts
! scope="col" width="50" | time
! scope="col" width="50" | counts/sec
|-
!PS1
|<math>2823\pm53.1</math>||20 min||<math>2.35\pm0.04</math>
|-
!PS2
|<math>3091\pm55.6</math>||20 min||<math>2.58\pm0.05</math>
|-
!PS1+PS2 
|<math>93\pm9.6</math>||20 min||<math>(7.7\pm0.8)\cdot 10^{-2}</math>
|}

2. The distance between PS and n's PMT is about 50 cm 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
! scope="col" width="50" | 
! scope="col" width="50" | counts
! scope="col" width="50" | time
! scope="col" width="50" | counts/sec
|-
!PS1
|<math>7513\pm86.5</math>||60 min||<math>2.09\pm0.02</math>
|-
!PS2
|<math>9036\pm95.1</math>||60 min||<math>2.51\pm0.03</math>
|-
!PS1+PS2 
|<math>251\pm15.8</math>||60 min||<math>(6.9\pm0.4)\cdot 10^{-2}</math>
|}



'''Second do the PS1+PS2+n's coincidence test '''

1. The distance between PS and n's PMT is about 80 cm 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
! scope="col" width="50" | 
! scope="col" width="50" | counts
! scope="col" width="50" | time
! scope="col" width="50" | counts/sec
|-
!PS1
|<math>3229\pm56.8</math>||20 min||<math>2.69\pm0.05</math>
|-
!PS2
|<math>3192\pm56.5</math>||20 min||<math>2.66\pm0.05</math>
|-
!PS1+PS2+n's 
|<math>59\pm7.7</math>||20 min||<math>(4.9\pm0.6)\cdot 10^{-2}</math>
|}

2. The distance between PS and n's PMT is about 50 cm 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
! scope="col" width="50" | 
! scope="col" width="50" | counts
! scope="col" width="50" | time
! scope="col" width="50" | counts/sec
|-
!PS1
|<math>7700\pm87.7</math>||60 min||<math>2.14\pm0.02</math>
|-
!PS2
|<math>9060\pm95.2</math>||60 min||<math>2.52\pm0.03</math>
|-
!PS1+PS2+n's 
|<math>214\pm14.6</math>||60 min||<math>(5.9\pm0.4)\cdot 10^{-2}</math>
|}




The scope pictures of coincidence events looks like:

{| border="0" cellspacing="0" style="text-align: center; width: 1050px; height: 100px;"
! scope="col" width="50" |PS1+PS2 event looks like:
! scope="col" width="50" |PS1+PS2+n event looks like:
|-
|[[File:Cosmic coinc PS1 PS2.png | 500px]] || [[File:Cosmic coinc PS1 PS2 n.png | 500px]]
|}