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

32 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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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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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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Unstable universal drift eigenmodes in toroidal plasmas

Abstract

All Science Journal Classification (ASJC) codes

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