Unstable universal drift eigenmodes in toroidal plasmas

C. Z. Cheng; Liu Chen

doi:10.1063/1.863202

Unstable universal drift eigenmodes in toroidal plasmas

C. Z. Cheng
, Liu Chen

Institute of Space and Plasma Sciences

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

35 Citations (Scopus)

Abstract

The eigenmode equation describing ballooning collisionless drift instabilities is analyzed both analytically and numerically. A new branch of eigenmodes, which corresponds to quasi-bound states due to toroidal coupling effects such as ion ∇B drifts, is shown to be destabilized by electron Landau damping for typical tokamak parameters. This branch cannot be understood by the strong coupling approximation. However, the slab-like (Pearlstein-Berk-type) branch is found to remain stable and experience enhanced shear damping.

Original language	English
Pages (from-to)	1770-1773
Number of pages	4
Journal	Physics of Fluids
Volume	23
Issue number	9
DOIs	https://doi.org/10.1063/1.863202
Publication status	Published - 1980

All Science Journal Classification (ASJC) codes

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1063/1.863202

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title = "Unstable universal drift eigenmodes in toroidal plasmas",

abstract = "The eigenmode equation describing ballooning collisionless drift instabilities is analyzed both analytically and numerically. A new branch of eigenmodes, which corresponds to quasi-bound states due to toroidal coupling effects such as ion ∇B drifts, is shown to be destabilized by electron Landau damping for typical tokamak parameters. This branch cannot be understood by the strong coupling approximation. However, the slab-like (Pearlstein-Berk-type) branch is found to remain stable and experience enhanced shear damping.",

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AU - Cheng, C. Z.

AU - Chen, Liu

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N2 - The eigenmode equation describing ballooning collisionless drift instabilities is analyzed both analytically and numerically. A new branch of eigenmodes, which corresponds to quasi-bound states due to toroidal coupling effects such as ion ∇B drifts, is shown to be destabilized by electron Landau damping for typical tokamak parameters. This branch cannot be understood by the strong coupling approximation. However, the slab-like (Pearlstein-Berk-type) branch is found to remain stable and experience enhanced shear damping.

AB - The eigenmode equation describing ballooning collisionless drift instabilities is analyzed both analytically and numerically. A new branch of eigenmodes, which corresponds to quasi-bound states due to toroidal coupling effects such as ion ∇B drifts, is shown to be destabilized by electron Landau damping for typical tokamak parameters. This branch cannot be understood by the strong coupling approximation. However, the slab-like (Pearlstein-Berk-type) branch is found to remain stable and experience enhanced shear damping.

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U2 - 10.1063/1.863202

DO - 10.1063/1.863202

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SN - 1070-6631

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JO - Physics of Fluids

JF - Physics of Fluids

IS - 9

ER -

Unstable universal drift eigenmodes in toroidal plasmas

Abstract

All Science Journal Classification (ASJC) codes

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