A compact neutron counter telescope with thick radiator (Cotetra) for fusion experiment

Details A compact neutron counter telescope with thick radiator (Cotetra) for fusion experiment A compact neutron counter telescope with thick radiator (Cotetra) for fusion experiment

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993cnct.rept.....o&link_type=abstract

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Physics

Computerized Simulation, Dynamic Range, Neutron Counters, Neutron Spectrometers, Plasmas (Physics), Monte Carlo Method, Recoil Protons, Telescopes

Scientific paper

A new type of neutron spectrometer, based on recoil proton measurement, was developed for diagnosing a DT fusion plasma. This spectrometer has such advantages as: (1) direct measurement of the neutron energy without the unfolding procedure, (2) relatively high detection efficiency for 14 MeV neutrons, (3) a wide dynamic range of counting rate, and (4) perfect n-gamma discrimination. To examine the performance of this spectrometer, a Monte Carlo simulation code was developed. It predicts that we may achieve energy resolution up to 3 percent with a detection efficiency of 10(exp -5) (count cm(sup 2)/n) if we could successfully adjust the condition of the spectrometer. A prototype spectrometer was constructed and was compared with the Monte Carlo prediction. The energy resolution of 5.3 plus or minus 0.7 percent for 14 MeV neutron was obtained for the prototype spectrometer and the calculation agrees with the experimental results within its margin of error if we take into account the intrinsic energy resolution of the detector that is used in the prototype.

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