Abstract
The ponderomotive force due to high‐frequency microinstabilities can affect the low‐frequency macrostability. Two examples of this phenomenon are discussed. It is shown that an α particle loss‐cone instability stabilizes the flute mode of an ignited, axisymmetric mirror plasma. In tokamaks, the ion‐whistler instability, driven by an anisotropic population of energetic particles, stabilizes the internal kink mode for JET range of parameters.
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