Existence of weakly damped kinetic Alfv́n eigenmodes in reversed shear tokamak plasmas

N. N. Gorelenkov

doi:10.1063/1.3027512

Existence of weakly damped kinetic Alfv́n eigenmodes in reversed shear tokamak plasmas

N. N. Gorelenkov

PPPL Theory

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

A kinetic theory of weakly damped Alfv́n eigenmode solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. It is shown that finite Larmor radius (FLR) effects are required for global eigenmode solutions. FLR effects induce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alfv́nic instabilities with frequencies sweeping down and reaching their minimum (bottom).

Original language	English (US)
Article number	110701
Journal	Physics of Plasmas
Volume	15
Issue number	11
DOIs	https://doi.org/10.1063/1.3027512
State	Published - 2008

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.3027512

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title = "Existence of weakly damped kinetic Alf{\'v}n eigenmodes in reversed shear tokamak plasmas",

abstract = "A kinetic theory of weakly damped Alf{\'v}n eigenmode solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. It is shown that finite Larmor radius (FLR) effects are required for global eigenmode solutions. FLR effects induce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alf{\'v}nic instabilities with frequencies sweeping down and reaching their minimum (bottom).",

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AB - A kinetic theory of weakly damped Alfv́n eigenmode solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. It is shown that finite Larmor radius (FLR) effects are required for global eigenmode solutions. FLR effects induce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alfv́nic instabilities with frequencies sweeping down and reaching their minimum (bottom).

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DO - 10.1063/1.3027512

M3 - Article

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JF - Physics of Plasmas

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Existence of weakly damped kinetic Alfv́n eigenmodes in reversed shear tokamak plasmas

Abstract

All Science Journal Classification (ASJC) codes

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