Fast-ion-driven vertical modes in magnetically confined toroidal plasmas

T. Barberis; F. Porcelli; A. Yolbarsop

doi:10.1088/1741-4326/ac5ad0

Fast-ion-driven vertical modes in magnetically confined toroidal plasmas

T. Barberis
, F. Porcelli
, A. Yolbarsop

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

Abstract

A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfvén frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.

Original language	American English
Article number	064002
Journal	Nuclear Fusion
Volume	62
Issue number	6
DOIs	https://doi.org/10.1088/1741-4326/ac5ad0
State	Published - Jun 2022
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

Keywords

axisymmetric MHD modes
energetic particle confinement and stability in magnetically confined plasmas
theory of tokamak fusion plasmas

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10.1088/1741-4326/ac5ad0

Cite this

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title = "Fast-ion-driven vertical modes in magnetically confined toroidal plasmas",

abstract = "A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfv{\'e}n frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.",

keywords = "axisymmetric MHD modes, energetic particle confinement and stability in magnetically confined plasmas, theory of tokamak fusion plasmas",

author = "T. Barberis and F. Porcelli and A. Yolbarsop",

note = "Publisher Copyright: {\textcopyright} EURATOM 2022.",

year = "2022",

month = jun,

doi = "10.1088/1741-4326/ac5ad0",

language = "American English",

volume = "62",

journal = "Nuclear Fusion",

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T1 - Fast-ion-driven vertical modes in magnetically confined toroidal plasmas

AU - Barberis, T.

AU - Porcelli, F.

AU - Yolbarsop, A.

N1 - Publisher Copyright: © EURATOM 2022.

PY - 2022/6

Y1 - 2022/6

N2 - A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfvén frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.

AB - A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfvén frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.

KW - axisymmetric MHD modes

KW - energetic particle confinement and stability in magnetically confined plasmas

KW - theory of tokamak fusion plasmas

UR - https://www.scopus.com/pages/publications/85128491044

UR - https://www.scopus.com/pages/publications/85128491044#tab=citedBy

U2 - 10.1088/1741-4326/ac5ad0

DO - 10.1088/1741-4326/ac5ad0

M3 - Article

SN - 0029-5515

VL - 62

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 6

M1 - 064002

ER -

Fast-ion-driven vertical modes in magnetically confined toroidal plasmas

Abstract

ASJC Scopus subject areas

Keywords

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