Difference between revisions of "Cf252 runs with HPGe"
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[[2nCor 44|go back]] | [[2nCor 44|go back]] | ||
| + | I made a page discussing neutron damage to the HPGe detector as a function of the total amount of fast neutrons per cm^2 irradiated on the detector face. 5*10^6 n/cm^2 is a factor of 10 below the point where damage was first observed in an experiment. | ||
=12/29/16= | =12/29/16= | ||
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!Run # !! RunTime [sec] !! distance[cm] !! n flux <math>[\frac{n}{cm^2}]</math><br><math>=\frac{n_{rate}t}{4\pi d^2}</math> <br>([[Cf-252 rates table|<small>Cf252 rates</small>]]) || Integral <br>n flux <br> <math>[\frac{n}{cm^2}] </math> ||configuration || notes | !Run # !! RunTime [sec] !! distance[cm] !! n flux <math>[\frac{n}{cm^2}]</math><br><math>=\frac{n_{rate}t}{4\pi d^2}</math> <br>([[Cf-252 rates table|<small>Cf252 rates</small>]]) || Integral <br>n flux <br> <math>[\frac{n}{cm^2}] </math> ||configuration || notes | ||
|- | |- | ||
| − | | 5609 || 4060 || 30 || 6850 || 6850 || Cf252 in. Coincidence between HPGe and timing PMT || A ToF spectrum exists but is very hectic. Problem may be that the TDC stop is determined by a widened timing PMT pulse in coinc with a HPGe pulse that has high timing jitter. | + | | 5609 || 4060 || 30 || 6850 || 6850 || Cf252 in. Coincidence between HPGe and timing PMT || A ToF spectrum exists but is very hectic. Problem may be that the TDC stop is determined by a widened timing PMT pulse in coinc. with a HPGe pulse that has high timing jitter. |
|- | |- | ||
| none || 1250 || 26 || 2800 || 9655 || colspan=2 |Not taking data during this time. | | none || 1250 || 26 || 2800 || 9655 || colspan=2 |Not taking data during this time. | ||
Revision as of 22:12, 30 December 2016
I made a page discussing neutron damage to the HPGe detector as a function of the total amount of fast neutrons per cm^2 irradiated on the detector face. 5*10^6 n/cm^2 is a factor of 10 below the point where damage was first observed in an experiment.
12/29/16
| Run # | RunTime [sec] | distance[cm] | n flux (Cf252 rates) |
Integral n flux |
configuration | notes |
|---|---|---|---|---|---|---|
| 5609 | 4060 | 30 | 6850 | 6850 | Cf252 in. Coincidence between HPGe and timing PMT | A ToF spectrum exists but is very hectic. Problem may be that the TDC stop is determined by a widened timing PMT pulse in coinc. with a HPGe pulse that has high timing jitter. |
| none | 1250 | 26 | 2800 | 9655 | Not taking data during this time. | |
| 5611 | 2509 | 30 | 4230 | 13885 | Cf252 in. Coincidence between HPGe and timing PMT. TDC stop was changed to always be 1200 ns after PMT timing pulse, otherwise same setup as 5609. | ToF looks good. Neutron rate approx. 3 Hz for detector 90. |
| 5613 | 10025 | 15 | 0 | 13885 | Na-22 source. Coincidence between HPGe and timing PMT | Calibration |
| 5614 | 654 | 15 | 0 | 13885 | Co-60 source. Coincidence between HPGe and timing PMT | Calibration |