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Energetic Geodesic Acoustic Modes Associated with Two-Stream-like Instabilities in Tokamak Plasmas

Qu, Zhisong; Hole, Matthew; Fitzgerald, Michael


An unstable branch of the energetic geodesic acoustic mode (EGAM) is found using fluid theory with fast ions characterized by their narrow width in energy distribution and collective transit along field lines. This mode, with a frequency much lower than the thermal GAM frequency ωGAM, is now confirmed as a new type of unstable EGAM: a reactive instability similar to the two-stream instability. The mode can have a very small fast ion density threshold when the fast ion transit frequency is...[Show more]

CollectionsANU Research Publications
Date published: 2016
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.116.095004
Access Rights: Open Access


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