Alpha-tail production with ion-cyclotron-resonance heating of He-4-beam ions in JET plasmas

• Third-harmonic ion-cyclotron-resonance heating of He-4-beam ions has produced for the first time on the JET tokamak high-energy populations of He-4 ions to simulate 3.5 MeV fusion-born alpha (alpha) particles. Acceleration of He-4 ions to the MeV energy range is confirmed by gamma-ray emission from the nuclear reaction Be-9(alpha, ngamma) C-12 and excitation of Alfven eigenmodes. Concomitant electron heating and sawtooth stabilization are observed. The scheme could be used in next-step tokamaks to gain information on trapped alpha particles and to test a diagnostics in the early nonactivated phase of operation.

Nyckelord

toroidal alfven eigenmodes

deuterium-tritium plasmas

fusion test reactor

dt plasmas

tokamak plasma

icrf waves

performance

particles

tftr

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