Difference between revisions of "CH PAS He3 BorAl Attenuation Study"

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|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
|-
 
|-
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|  1  || Detector on poly at +1250V || 255 || Yes || 153 || 600 || ||  
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|  1  || Detector on poly at +1250V || 255 || Yes || 153 || 600 || 0.255 || 0.0412
 
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|-
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|  2  || Detector on poly at +1250V || 255 || Yes || 134 || 600 || ||  
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|  2  || Detector on poly at +1250V || 255 || Yes || 134 || 600 || 0.223 || 0.0386
 
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|  3  || Detector on poly at +1250V || 255 || Yes || 124 || 600 || ||  
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|  3  || Detector on poly at +1250V || 255 || Yes || 124 || 600 || 0.207 || 0.0371
 
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|  4  || Detector on poly at +1250V || 255 || Yes || 145 || 600 || ||  
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|  4  || Detector on poly at +1250V || 255 || Yes || 145 || 600 || 0.242 || 0.0401
 
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|  5  || Detector on poly at +1250V || 255 || Yes || 133 || 600 || ||  
+
|  5  || Detector on poly at +1250V || 255 || Yes || 133 || 600 || 0.222 || 0.0384
 
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Revision as of 21:16, 26 June 2021

Experimental Setup

Attenuation Measurements Setup
Poly box to contain Cf-252 source for attenuation measurements
 [[File:|400px|thumb|none|He3 tube mounting for attenuation measurements ]] [[File: |300px|thumb|none| ]]
[[File:|300px|thumb|none| ]]
Top down view of Cf-252 source in place, ready to be covered by top sheet of virgin poly
 [[File: |300px|thumb|none| ]]

The He3 detector is shrouded in BorAl, in a triangular configuration with +1250V to the pre-amp (this voltage is based on previous work by Jeff Burggraf and David Friant).

The thermalizing box is designed as regular poly surrounding the Cf-252 source on all sides except the side in the direction of the He3 tube.

The thermalizer is considered a regular poly sheet that can be slid in and out of the experimental setup.

The detector is ~30cm from the Cf-252 source. This allows for enough distance to insert 8" (20.32cm) of green borated poly, a 1" (2.54cm) thermalizing sheet, and still have the BorAl in the correct position.

No lead was included in the setup as it was not necessary.

The discriminator threshold was not changed during this experiment as it is in the center of the plateau work done by David Friant. See plot below.

Credit: David Friant. This plot is source in and source out He3 tube plateau measurements which were used to base discriminator and bias voltages for attenuation measurements.

Measurements

Background Measurements

I will be performing background runs overnight due to the low amount of background counts. This is necessary to get an acceptable level of uncertainty in the measurements as the count rate looks to be on the order of .5Hz.

The first run background run is taking place the evening of 6/25/21 and will end the following day.

Background run lasted for 60000 seconds and took place overnight. Run ended at approximately 11:45am 6/26/21

1250V Source Out Data
Run Number Configuration Discriminator Threshold (mV) Cf-252 Button Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on BorAl at +1250V 255 No 722 60000

Source In

No thermalizer, no borated poly, just BorAl shielding around detector

1250V Source In Data
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on BorAl at +1250V 255 Yes 236 300
2 Detector on BorAl at +1250V 255 Yes 263 60
3 Detector on BorAl at +1250V 255 Yes 251 60
4 Detector on BorAl at +1250V 255 Yes 203 60
5 Detector on BorAl at +1250V 255 Yes 218 60

Source In with Thermalizer

Thermalizer, no borated poly, & BorAl shielding around detector

1250V Source In Data
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on BorAl at +1250V 255 Yes 300
2 Detector on BorAl at +1250V 255 Yes 60
3 Detector on BorAl at +1250V 255 Yes 60
4 Detector on BorAl at +1250V 255 Yes 60
5 Detector on BorAl at +1250V 255 Yes 60

Green Poly without Thermalizer

1" Green poly (one sheet), no thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

2" Green poly (one brick) no thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 154 300 0.513 0.0414
2 Detector on poly at +1250V 255 Yes 163 300 0.543 0.0426
3 Detector on poly at +1250V 255 Yes 150 300 0.5 0.0408
4 Detector on poly at +1250V 255 Yes 125 300 0.417 0.0373
5 Detector on poly at +1250V 255 Yes 154 300 0.513 0.0414

3" Green poly (one brick & sheet) no thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

4" Green poly (two bricks) no thermalizer

These measurements need to be redone as <100 counts is higher than 10% uncertainty

300 sec runs

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 74 300
2 Detector on poly at +1250V 255 Yes 65 300
3 Detector on poly at +1250V 255 Yes 71 300
4 Detector on poly at +1250V 255 Yes 61 300
5 Detector on poly at +1250V 255 Yes 300

600 sec runs

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 153 600 0.255 0.0412
2 Detector on poly at +1250V 255 Yes 134 600 0.223 0.0386
3 Detector on poly at +1250V 255 Yes 124 600 0.207 0.0371
4 Detector on poly at +1250V 255 Yes 145 600 0.242 0.0401
5 Detector on poly at +1250V 255 Yes 133 600 0.222 0.0384

6" Green poly (three bricks) no thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 115 900
2 Detector on poly at +1250V 255 Yes 137 900
3 Detector on poly at +1250V 255 Yes 149 900
4 Detector on poly at +1250V 255 Yes 151 900
5 Detector on poly at +1250V 255 Yes 116 900

8" Green poly (four bricks) no thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 143 1200
2 Detector on poly at +1250V 255 Yes 133 1200
3 Detector on poly at +1250V 255 Yes 152 1200
4 Detector on poly at +1250V 255 Yes 154 1200
5 Detector on poly at +1250V 255 Yes 1200

Green Poly with Thermalizer

1" Green poly, with thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

2" Green poly (one brick) with thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

3" Green poly (one brick & sheet) with thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

4" Green poly (two bricks) with thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

6" Green poly (three bricks) with thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

8" Green poly (four bricks) with thermalizer

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec) Count Rate (Hz) Uncertainty
1 Detector on poly at +1250V 255 Yes 300
2 Detector on poly at +1250V 255 Yes 300
3 Detector on poly at +1250V 255 Yes 300
4 Detector on poly at +1250V 255 Yes 300
5 Detector on poly at +1250V 255 Yes 300

Go Back

CH He3 Attenuation Measurements

PAS Experiment Attenuation Measurements

PAS_He3_Detector

PAS_Experiment

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