Modelling of minority ion cyclotron current drive during the activated phase of ITER

摘要

Neoclassical tearing modes, triggered by the long-period sawteeth expected in tokamaks with large non-thermal alpha-particle populations, may impose a severe limit on experiments with large fusion yields and on reactors. Sawtooth destabilization by localized current drive could relax the limit and improve plasma performance. He-3 minority ion cyclotron current drive around the sawtooth inversion radius has been planned for ITER. Several ion species, including beam injected D ions and fusion born a particles, are however also resonant in the plasma and may represent a parasitic absorption of RF power.