UC Irvine

For ‘;beam-target’ fusion reactions, collimated measurements of the energy spectrum of one of the reaction products can provide information on the degree of anisotropy of the reacting beam ions. Early measurements of the spectrum of 15 MeV protons produced by reactions between energetic3He ions and relatively cold deuterons during fast-wave minority heating in the PLT tokamak found an asymmetric, downward-shifted fusion spectrum. New spectral measurements with a thicker detector that collects the full proton energy indicate that the velocity distribution of fast3He ions is peaked perpendicular to the tokamak magnetic field. © 1984 IOP Publishing Ltd.