Short wavelength geodesic acoustic mode excitation by energetic particles

Taking the collisionless damping of the geodesic acoustic mode (GAM) in the short wavelength limit originally investigated in [Z. Qiu et al., Plasma Phys. Controlled Fusion 51, 012001 (2009)] as an example, the physics processes underlying wave particle resonances in the short wavelength limit are c...

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Bibliographic Details
Published in:Physics of plasmas 2018-01, Vol.25 (1)
Main Authors: Chen, Liu, Qiu, Zhiyong, Zonca, Fulvio
Format: Article
Language:English
Subjects:
Controlled fusion
Damping
Distribution functions
Energetic particles
Excitation
Pitch (inclination)
Plasma physics
Plasmas (physics)
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Summary:Taking the collisionless damping of the geodesic acoustic mode (GAM) in the short wavelength limit originally investigated in [Z. Qiu et al., Plasma Phys. Controlled Fusion 51, 012001 (2009)] as an example, the physics processes underlying wave particle resonances in the short wavelength limit are clarified. As an illustrative application, GAM excitation by energetic particles in the short wavelength limit is investigated assuming a single pitch angle slowing-down fast ion equilibrium distribution function. Conditions for this energetic particle-induced GAM to be unstable are discussed.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5003142