Neutral beam driven global Alfvén eigenmodes in the Wendelstein W7-AS stellarator

A. Weller; D. A. Spong; R. Jaenicke; A. Lazaros; F. P. Penningsfeld; S. Sattler

doi:10.1103/PhysRevLett.72.1220

Neutral beam driven global Alfvén eigenmodes in the Wendelstein W7-AS stellarator

A. Weller
, D. A. Spong
, R. Jaenicke
, A. Lazaros
, F. P. Penningsfeld
, S. Sattler

Fusion Theory and Modeling

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

68 Scopus citations

Abstract

During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium β, which is driven by the energetic beam particles. As interpretation is given in terms of marginally stable global Alfvén eigenmodes (GAE), which are destabilized by Landau resonances of the far circulating particles. Toroidicity induced gaps for toroidal Alfvén eigenmodes do not occur in W7-AS but GAE modes in gaps below the shear Alfvén continua can be excited. This is investigated within a gyrofluid model, which has been used sucessfully for tokamak cases previously.

Original language	English
Pages (from-to)	1220-1223
Number of pages	4
Journal	Physical Review Letters
Volume	72
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.72.1220
State	Published - 1994

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10.1103/PhysRevLett.72.1220

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@article{9ace853ae0e3463cb00b9a76f5e4fa57,

title = "Neutral beam driven global Alfv{\'e}n eigenmodes in the Wendelstein W7-AS stellarator",

abstract = "During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium β, which is driven by the energetic beam particles. As interpretation is given in terms of marginally stable global Alfv{\'e}n eigenmodes (GAE), which are destabilized by Landau resonances of the far circulating particles. Toroidicity induced gaps for toroidal Alfv{\'e}n eigenmodes do not occur in W7-AS but GAE modes in gaps below the shear Alfv{\'e}n continua can be excited. This is investigated within a gyrofluid model, which has been used sucessfully for tokamak cases previously.",

author = "A. Weller and Spong, \{D. A.\} and R. Jaenicke and A. Lazaros and Penningsfeld, \{F. P.\} and S. Sattler",

year = "1994",

doi = "10.1103/PhysRevLett.72.1220",

language = "English",

volume = "72",

pages = "1220--1223",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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T1 - Neutral beam driven global Alfvén eigenmodes in the Wendelstein W7-AS stellarator

AU - Weller, A.

AU - Spong, D. A.

AU - Jaenicke, R.

AU - Lazaros, A.

AU - Penningsfeld, F. P.

AU - Sattler, S.

PY - 1994

Y1 - 1994

N2 - During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium β, which is driven by the energetic beam particles. As interpretation is given in terms of marginally stable global Alfvén eigenmodes (GAE), which are destabilized by Landau resonances of the far circulating particles. Toroidicity induced gaps for toroidal Alfvén eigenmodes do not occur in W7-AS but GAE modes in gaps below the shear Alfvén continua can be excited. This is investigated within a gyrofluid model, which has been used sucessfully for tokamak cases previously.

AB - During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium β, which is driven by the energetic beam particles. As interpretation is given in terms of marginally stable global Alfvén eigenmodes (GAE), which are destabilized by Landau resonances of the far circulating particles. Toroidicity induced gaps for toroidal Alfvén eigenmodes do not occur in W7-AS but GAE modes in gaps below the shear Alfvén continua can be excited. This is investigated within a gyrofluid model, which has been used sucessfully for tokamak cases previously.

UR - https://www.scopus.com/pages/publications/0000515238

U2 - 10.1103/PhysRevLett.72.1220

DO - 10.1103/PhysRevLett.72.1220

M3 - Article

AN - SCOPUS:0000515238

SN - 0031-9007

VL - 72

SP - 1220

EP - 1223

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

ER -

Neutral beam driven global Alfvén eigenmodes in the Wendelstein W7-AS stellarator

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