BriansRanLogbook

This is where I write down what I'm doing

1/13/23 : Turned on HpGe HV to 1500 and learned about analog to digital signal processing

detected signal rate -vs- HpGe Voltage

HpGe Detector

HPGe Counts vs Voltage Cs-137 Source

High Voltage (V)	Counts (with source)	Counts (no source)
1492.67	1532.5 ± 36.67	167.5 ± 7.78
799.15	1336.5 ± 2.12	149.4 ± 34.65
396.83	1193.5 ± 54.48	127.5 ± 7.78
197.19	1035.5 ± 40.31	121 ± 4.24
4.88	562.5 ± 2.12	332 ± 35.36

He3 Tube

1/27/23 : Turned on He3 detector, adjusted to find counts with Cf source in containment and out of containment

2/3/23 : Same as 1/27, adjusting discriminator voltage and recording counts with Cf-252 source. Encountered strange effects of higher counts with source away at low QD voltage. Sets of measurements notably inconsistent.

He3 Counts vs Voltage (1208 HV)

Discriminator Voltage (V)	Counts/10s (no source)	Counts/10s (with source)
2.003	4.4 ± 1.67	97.0 ± 8.49
1.788	4.8 ± 1.09	108.2 ± 10.89
1.503	5.4 ± 2.22	105.7 ± 8.63
1.227	7.9 ± 3.14	109.8 ± 9.34
1.009	89.9 ± 7.87	234.1 ± 20.06
0.799	2656 ± 251.1	2447 ± 183.0
0.485	55479 ± 1325	48360 ± 1938

Plateau graph for He3 tube at 1208V

2/10/23 Same procedure as 2/3/23, just changing HV applied to He3 detector to values of 1300V then 1100V.

He3 Counts vs Voltage (1100 HV)

Discriminator Voltage (V)	Counts/10s (no source)	Counts/10s (with source)
1.971	4.6 ± 2.37	107.7 ± 13.17
1.775	7.7 ± 2.11	100 ± 10.70
1.486	5.5 ± 2.32	104.8 ± 12.79
1.248	4.7 ± 2.00	99.6 ± 7.09
1.013	75.2 ± 12.17	171 ± 12.82
0.762	3074 ± 143.0	2833 ± 894.7
0.509	19658 ± 424.6	40290 ± 2402

Plateau graph for He3 tube at 1100V

He3 Counts vs Voltage (1300 HV)

Discriminator Voltage (V)	Counts/10s (no source)	Counts/10s (with source)
1.971	5.4 ± 1.78	111.3 ± 9.97
1.773	5.3 ± 1.89	97.3 ± 7.70
1.524	7.1 ± 4.51	99.7 ± 11.78
1.275	12.2 ± 3.55	117.3 ± 23.11
0.993	177.7 ± 8.18	351.9 ± 28.71
0.784	2691.2 ± 114.7	2763.7 ± 126.2
0.485	50346 ± 3831	53920 ± 4354

Plateau graph for He3 tube at 1300V

04/04/2023

• Worked with Dr. Forest to tune the He3 detector such that the peak height of the signal could be read by the computer.
• Set up the computer to read from the peak sensing ADC and start taking measurements.
• Started a background measurement to run overnight.

04/05/2023

• Ended the background measurement.
• Took a new measurement, this time with source out.

04/07/2023

• Worked with Dr. Forest to graph the two measurements and to create a graph of the source out measurement minus the background measurement.
• Began re-tuning the detector in order to repeat the process once more.