A neutron detector sensitive from 2 to 100 MeV is described. neutron/cm -sec at a counting rate of one per minute, the energy resolution is 12% at 15 MeV and 30% at 100 MeV. The angle between the incoming neutron and the recoil neutron is measured to ± 10 .
The energy and flux measurement of D–D and D–T fusion neutrons provides a nonperturbing probe of plasma performance. In particular, ion temperature distribution of the plasma can be determined. This information can distinguish neutron production mechanisms, i.e., knock-on or thermonuclear in origin. To perform a fast neutron measurement, a high data rate double scatter spectrometer has been developed. This allows for a definitive measurement of the flux, energy, angle, and time distributions of neutrons from within the plasma. In addition, x-ray discrimination can be achieved from the time-of-flight information. The specific design issues and performance of the spectrometer will be described.
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