Existence of Weakly Damped Kinetic Alfven Eigenmodes in Reversed Shear Tokamak Plasmas.

Gorelenkov, N. N.

Technical Information Center Oak Ridge Tennessee

关键词: Plasma physics;    Nuclear fusion;    Tokamak devices;    Alfven eigenmodes;    Damping;   

RP-ID  :  DE2009953698

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A kinetic theory of weakly damped Alfven Eigenmode (AE) solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. We show that the ideal MHD model is not sufficient for the eigenmode solutions if the standard causality condition bypass rule is applied. Finite Larmor radius effects are required, which introduce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alfvenic instabilities with frequencies sweeping down and reaching their minimum (bottom).