Abstract
Profiles of the d(d,p)t fusion reaction are measured in the PLT Tokamak using an array of collimated 3 MeV proton detectors. During deuterium neutral beam injection, the emission profile indicates that the beam deposition is as narrow as predicted by a bounce-averaged Fokker-Planck code. The fast ion tail formed by lower hybrid waves (at densities above the critical density for current drive) also peaks strongly near the magnetic axis.
Highlights
The deposition of auxiliary power affects the heating and stability of a tokamak plasma
The results indicate that the wave damping on ions is centrally located and that the fast-ion tail probably only dissipates a small fraction of the applied lower hybrid power
This paper presents experimental results obtained by measuring 3 MeV protons pro duced in d(d,p)t fusion reactions with an array of collimated silicon surface barrier detec tors
Summary
The deposition of auxiliary power affects the heating and stability of a tokamak plasma. Measurements of the density of energetic ions created by auxiliary heating can be used to infer the power deposition profile. The density of energetic ions was studied by measuring the spatial distribution of d(d,n)3He fusion reactions during neutral beam (STRACHAN, 1978) and lower hybrid (SCHUSS, 1981) heating. Fusion reaction rate profiles were measured during lower hybrid heating of a PLT deuterium plasma at a density where the fusion reactivity was enhanced by the formation of an ion tail. In this case, the fusion reactions are due to the energetic ion tail created by the lower hybrid waves. The results indicate that the wave damping on ions is centrally located and that the fast-ion tail probably only dissipates a small fraction of the applied lower hybrid power
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