Difference between revisions of "Threshold & HV study"

From New IAC Wiki
Jump to navigation Jump to search
(Blanked the page)
 
Line 1: Line 1:
==Overview==
 
A series of triggered CF-252 runs are conducted at various detector PMT high voltages and discriminator thresholds. A TDC spectrum is acquired using daq2 so that  a neutron cut can be applied. These data provides us with a relationship between neutron detection rate and PMT HV/threshold.
 
  
==Setup==
 
A CF-252 source along with a trigger scintillator is placed at the geometric center of the array of neutron detectors.  The source discriminator threshold is kept constant throughout the study at 100 mV.
 
 
Pulses from the source trigger are delayed by 1500 ns and serve as the common stop time for the TDC.
 
 
An event is considered a neutron detection if both PMT top and bottom saw a hit and the resulting ToF also lies in the neutron range.
 
 
==results==
 
{| border="1" style="border: 4px solid black; border-collapse: collapse; padding: 5px;vertical-align: middle; text-align: center "
 
 
|- style="text-align: center ;vertical-align: middle ;  border-bottom: 2px solid black;"
 
! Detector
 
! <math>n_{0}</math> rate
 
! <math>\gamma</math> rate
 
!noise
 
!<math>n_{0}</math>/noise
 
! run #
 
! PMT <br>threshold
 
! HV
 
 
|-
 
!D30
 
| n0
 
|gamma
 
| noise
 
|n0/nois
 
| rowspan="4" | r5242
 
| rowspan="4" | 25
 
| rowspan="16" | 1700
 
|-
 
!D90
 
| n0
 
|gamma
 
| noise
 
|n0/nois
 
|-
 
!D150
 
| n0
 
|gamma
 
| noise
 
|n0/nois
 
|- 
 
!D225
 
| n0
 
|gamma
 
| noise
 
|n0/nois
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5239
 
| rowspan="4" | 30
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|-
 
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5240
 
| rowspan="4" | 35
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|-
 
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5241
 
| rowspan="4" | 40
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|- style=" border-bottom: 2px solid black;"
 
!D225
 
| ?
 
| ??
 
|-
 
 
<!--________1650__________________-->
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5243
 
| rowspan="4" | 25
 
| rowspan="16" | 1650
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|- 
 
!D225
 
| ?
 
| ??
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5244
 
| rowspan="4" | 30
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|-
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5245
 
| rowspan="4" | 35
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|-
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5246
 
| rowspan="4" | 40
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|- style=" border-bottom: 2px solid black;"
 
!D225
 
| ?
 
| ??
 
|-
 
 
<!--_____________1600_________-->
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5247
 
| rowspan="4" | 25
 
|rowspan="16"|1600
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5248
 
| rowspan="4" | 30
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5249
 
| rowspan="4" | 35
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5250
 
| rowspan="4" | 40
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|- style=" border-bottom: 2px solid black;"
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5251
 
| rowspan="4" | 25
 
|rowspan="16"| 1550
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5252
 
| rowspan="4" | 30
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5253
 
| rowspan="4" | 35
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
|-
 
!D30
 
| ?
 
| ??
 
| rowspan="4" | r5254
 
| rowspan="4" | 40
 
|-
 
!D90
 
| ?
 
| ??
 
|-
 
!D150
 
| ?
 
| ??
 
|-
 
!D225
 
| ?
 
| ??
 
|- 
 
 
 
|}
 

Latest revision as of 18:47, 17 October 2016