A novel diagnostic for ion temperature and density is discussed. The diagnostic, based on the detection of the 24-MeV gamma photon from the D(d, γ)4He fusion reaction, appears feasible in reactor-oriented tokamaks. The use of an optimized differential neutron/gamma filter reduces this ratio from 107at the plasma to approx. 1 on the detector. Under these conditions, measurement of the plasma ion temperature and density of a thermonuclear plasma is possible by using a large, high-purity germanium detector as a spectrometer.
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