Difference between revisions of "Neutron Time of Flight Test"
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| − | = | + | ==Verifying Neutron Detection== |
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| − | This test included one detector and a collimated Cf-252 source. The detector was placed 16 inches away from the source collimator. Tests were performed with various thicknesses of poly in between the two. Each count was 5 minutes long and three counts were taken for each test. | + | This test included one detector and a collimated Cf-252 source. The detector was placed 16 inches away from the source collimator. Tests were performed with various thicknesses of poly in between the two. Each count was 5 minutes long and three counts were taken for each test. Detector D was used at 1618 volts through channel 3 of LeCroy power supply and a threshold of 77mV set through the blue faced CFD. |
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|- | |- | ||
|setup | |setup | ||
| − | |1 block (4") | + | |1 poly block (4") |
| − | |2 blocks (8") | + | |2 poly blocks (8") |
| − | |3 blocks (12") | + | |3 ply blocks (12") |
| − | |4 blocks (16") | + | |4 poly blocks (16") |
| − | |no | + | |no poly |
|background | |background | ||
| − | |background with detector shielded | + | |background with detector shielded with 4" poly |
|- | |- | ||
|test 1 counts | |test 1 counts | ||
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|1334 | |1334 | ||
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| + | |} | ||
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| + | ---- | ||
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| + | ==Test for Time of Flight== | ||
| + | A test was performed using a Cf-252 source and two plastic scintillator detectors. The two detectors were placed in parallel with the source. The idea was that the source would emit a neutron and that neutron would hit the first detector and then the second. The signals from the detectors would show up on the oscilloscope being spaced a certain measurable distance/time apart. This was acquired by gating the signal. | ||
| + | |||
| + | [http://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL Go Back] | ||
Latest revision as of 06:22, 5 February 2009
Verifying Neutron Detection
This test included one detector and a collimated Cf-252 source. The detector was placed 16 inches away from the source collimator. Tests were performed with various thicknesses of poly in between the two. Each count was 5 minutes long and three counts were taken for each test. Detector D was used at 1618 volts through channel 3 of LeCroy power supply and a threshold of 77mV set through the blue faced CFD.
| setup | 1 poly block (4") | 2 poly blocks (8") | 3 ply blocks (12") | 4 poly blocks (16") | no poly | background | background with detector shielded with 4" poly |
| test 1 counts | 7180 | 5142 | 3945 | 3235 | 11793 | 1620 | 1314 |
| test 2 counts | 7291 | 5213 | 3994 | 3084 | 11694 | 1648 | 1336 |
| test 3 counts | 7319 | 5205 | 4014 | 3150 | 11872 | 1629 | 1352 |
| averages | 7263 | 5187 | 3984 | 3156 | 11786 | 1632 | 1334 |
Test for Time of Flight
A test was performed using a Cf-252 source and two plastic scintillator detectors. The two detectors were placed in parallel with the source. The idea was that the source would emit a neutron and that neutron would hit the first detector and then the second. The signals from the detectors would show up on the oscilloscope being spaced a certain measurable distance/time apart. This was acquired by gating the signal.