CH PAS He3 BorAl Attenuation Study

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| ]]

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.

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

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		600
4	Detector on poly at +1250V	255	Yes		600
5	Detector on poly at +1250V	255	Yes		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		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) 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

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CH He3 Attenuation Measurements

PAS Experiment Attenuation Measurements

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PAS_Experiment