Short Wavelength Geodesic Acoustic Mode Excitation by Energetic Particles
Liu Chen, Zhiyong Qiu, Fulvio Zonca
TL;DR
This paper investigates the excitation of short wavelength geodesic acoustic modes (GAMs) by energetic particles, clarifying wave-particle resonance physics and identifying conditions for instability using a simplified fast ion distribution model.
Contribution
It provides a detailed analysis of wave-particle resonance mechanisms for short wavelength GAM excitation by energetic particles, extending understanding of EGAM instability conditions.
Findings
Identifies key resonance processes in short wavelength GAM excitation.
Derives conditions under which energetic particles destabilize GAMs.
Clarifies the role of fast ion distributions in EGAM instability.
Abstract
Taking the collisionless damping of geodesic acoustic mode (GAM) as an example, the physics processes underlying wave particle resonances in the short wavelength limit are clarified. As illus- trative application, GAM excitation by energetic particles in short wavelength limit is investigated assuming a single pitch angle slowing-down fast ion equilibrium distribution function. Conditions for this energetic particle-induced GAM (EGAM) to be unstable are discussed.
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