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 |
|
|
| 2 |
Detector on poly at +1250V |
255 |
Yes |
163 |
300 |
|
|
| 3 |
Detector on poly at +1250V |
255 |
Yes |
150 |
300 |
|
|
| 4 |
Detector on poly at +1250V |
255 |
Yes |
125 |
300 |
|
|
| 5 |
Detector on poly at +1250V |
255 |
Yes |
154 |
300 |
|
|
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 |
|
|
| 2 |
Detector on poly at +1250V |
255 |
Yes |
134 |
600 |
|
|
| 3 |
Detector on poly at +1250V |
255 |
Yes |
124 |
600 |
|
|
| 4 |
Detector on poly at +1250V |
255 |
Yes |
145 |
600 |
|
|
| 5 |
Detector on poly at +1250V |
255 |
Yes |
133 |
600 |
|
|
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 |
|
900 |
|
|
| 4 |
Detector on poly at +1250V |
255 |
Yes |
|
900 |
|
|
| 5 |
Detector on poly at +1250V |
255 |
Yes |
|
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 |
|
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 |
|
|
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
