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Fast excitation of geodesic acoustic mode by energetic particle beams

A new mechanism for Geodesic acoustic mode (GAM) excitation by a not fully slowed down energetic particle (EP) beam is analysed to explain experimental observations in Large Helical Device. It is shown that the positive velocity space gradient near the lower-energy end of the EP distribution function can strongly drive GAM unstable. The new features of this EP-induced GAM (EGAM) are: 1. no instability threshold in the pitch angle; 2. the EGAM frequency can be higher than the local GAM frequency; and 3. the instability growth rate is much larger than that driven by a fully slowed down EP beam.

preprint2015arXivOpen access
Jintao CaoZhiyong QiuFulvio Zonca
physics.plasm-ph
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Open access3 authors1 topic
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Jintao CaoZhiyong QiuFulvio Zonca

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