Nonlinear Splitting of Fast Particle Driven Waves in a Plasma: Observation and Theory

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作者：

A Fasoli，BN Breizman，D Borba，RF Heeter，MS Pekker，SE Sharapov

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摘要：

The measured spectra of fast particle driven Alfvén eigenmodes in the JET tokamak plasma are interpreted on the basis of a nonlinear model of near-threshold kinetic instabilities. The observed mode splitting is a manifestation of the general nonlinear phenomena due to the combination of resonant wave-particle interaction and collisionlike relaxation of the resonant particles. The instability growth rate and the effective collision frequency of the resonant particles are determined.

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关键词：

Theoretical or Mathematical, Experimental/ plasma Alfven waves plasma instability plasma nonlinear processes plasma toroidal confinement/ nonlinear splitting fast particle driven waves plasma fast particle driven Alfven eigenmodes JET tokamak plasma nonlinear model near-threshold kinetic instabilities mode splitting nonlinear phenomena resonant wave-particle interaction collisionlike relaxation resonant particles instability growth rate/ A5235B Plasma magnetohydrodynamic waves, Alfven and hydromagnetic waves A5255G Plasma in torus (stellarator, tokamak, etc.) A5235P Plasma instabilities A5235M Nonlinear plasma waves and nonlinear interactions