Diagnostics with charged fusion products in ASDEX

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Abstract
A diagnostic for measuring the spectra of 3-MeV protons and 1-MeV tritons from DD fusion reactions in a tokamak has been developed. The emphasis in this work was on obtaining an energy resolution high enough to get information on the ion energy distribution from the energy spectra of the charged fusion reaction products. This low-noise system allowed the first direct measurement of the spectra of 1-MeV tritons from a tokamak. The diagnostic system is described, and measurements of the ion temperature and spectra resulting from non-Maxwellian ion distributions are presented. Rotating the detector from shot to shot to get different lines of sight, it is even possible to obtain an emission profile of the fusion reaction products.