Abstract
A new type of fast neutron spectrometer composed of a CH 4 proportional counter and a Si semiconductor detector which is called the counter telescope type was constructed for plasma-temperature diagnostics. The counting gas CH 4 is used as a converter of neutrons to protons. Since the energy loss of the proton in the converter CH 4 can be fairly precisely measured with the proportional counter, the energy resolution for the proton is high, so that a good energy resolution for neutrons is obtained. The energy resolution of the spectrometer itself excluding the energy spread of the D–T 14 MeV neutrons was 1.7% which seems to be the best so far, and the detection efficiency was 1×10 −6. If better energy resolution is preferable, even 0.5% is obtained and the efficiency in this case is 4×10 −8.
Published Version
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