BriansRanLogbook

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Revision as of 22:05, 11 April 2023 by Rasmbria (talk | contribs)
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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
HpGe Detector Voltage vs Counts graph.jpg

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

03/31/2023

  • Analyzed the plateau graphs.
  • Began taking plateau measurements between a discriminator voltage range of about 1.000V and 1.250V to determine where the noise is cut from the signal.
  • Got abnormal fluctuations in counts.

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.

04/11/2023

  • Finished tuning the detector and took another source out measurement. The discriminator threshold this time was at 3.660V.
  • Completed a second background measurement.