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Observation of magnetohydrodynamic instabilities in Heliotron J plasmas

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Date

2007

Authors

Yamamoto, S
Nagasaki, Kazunobu
Suzuki, Y
Mizuuchi, T
Okada, H
Kobayashi, S
Blackwell, Boyd
Kondo, Katsumi
Motojima, G
Nakajima, N

Journal Title

Journal ISSN

Volume Title

Publisher

American Nuclear Society

Abstract

Two kinds of magnetohydrodynamics instability are observed in electron cyclotron heating and neutral beam injection-heated Heliotron J plasmas. One is the pressure-driven interchange modes with m = 2/n = 1 and m = 5/n = 3 and low frequency (fexp < 20 kHz), which are observed in the plasma with a rational surface of 1/2π= 0.5 or 0.65. The other is the energetic ion-driven global Alfvén eigenmodes (GAEs) in the Alfvén frequency range. To identify the observed GAEs, the frequency of the observed mode with shear Alfvén spectra calculated by CAS3D3 is compared. The interchange mode with m= 5M = 3 and bursting GAE with intense magnetic fluctuations may affect the bulk plasma confinement and energetic ion transport, respectively.

Description

Keywords

Keywords: Electron cyclotron resonance; Magnetohydrodynamics; Neutron beams; Particle accelerators; Particle beam injection; Plasma confinement; Plasma heating; Transport properties; Alfvén eigenmodes; Interchange modes; Magnetic fluctuations; Magnetohydrodynamic i Advanced stellarator; Alfvén eigenmodes; MHD instabilities

Citation

URI

http://hdl.handle.net/1885/19231

Collections

Open Access Research

Source

Fusion Science and Technology

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

Restricted until

2037-12-31

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