MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection

K. Toi; S. Ohdachi; S. Yamamoto; S. Sakakibara; K. Y. Watanabe; N. Nakajima; X. Ding; J. Li; S. Morita; K. Narihara; K. Tanaka; T. Tokuzawa; H. Yamada; Q. Yang

doi:10.1088/1009-0630/6/3/001

MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection

K. Toi
, S. Ohdachi
, S. Yamamoto
, S. Sakakibara
, K. Y. Watanabe
, N. Nakajima
, X. Ding
, J. Li
, S. Morita
, K. Narihara
, K. Tanaka
, T. Tokuzawa
, H. Yamada
, Q. Yang

School of Electrical Engineering

National Institute for Fusion Science
Nagoya University
Southestern Institute of Physics

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

1 Scopus citations

Abstract

MHD stability of the Large Helical Device (LHD) plasmas produced with intense neutral beam injection is experimentally studied. When the steep pressure gradient near the edge is produced through L-H transition or linear density ramp experiment, interchange-like MHD modes whose rational surface is located very close to the last closed flux surface are strongly excited in a certain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmas produced at low toroidal field, various Alfvén eigenmodes are often excited. Bursting toroidal Alfvén egenmodes excited by the presence of energetic ions induce appreciable amount of energetic ion loss, but also trigger the formation of internal and edge transport barriers.

Original language	English
Pages (from-to)	2269-2274
Number of pages	6
Journal	Plasma Science and Technology
Volume	6
Issue number	3
DOIs	https://doi.org/10.1088/1009-0630/6/3/001
State	Published - Jun 2004

Keywords

Alfvén eigenmodes
Interchange instabilities
L-H transition

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10.1088/1009-0630/6/3/001

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Toi, K., Ohdachi, S., Yamamoto, S., Sakakibara, S., Watanabe, K. Y., Nakajima, N., Ding, X., Li, J., Morita, S., Narihara, K., Tanaka, K., Tokuzawa, T., Yamada, H., & Yang, Q. (2004). MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection. Plasma Science and Technology, 6(3), 2269-2274. https://doi.org/10.1088/1009-0630/6/3/001

@article{2cf941a2cca84641a45643c55e7e065a,

title = "MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection",

abstract = "MHD stability of the Large Helical Device (LHD) plasmas produced with intense neutral beam injection is experimentally studied. When the steep pressure gradient near the edge is produced through L-H transition or linear density ramp experiment, interchange-like MHD modes whose rational surface is located very close to the last closed flux surface are strongly excited in a certain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmas produced at low toroidal field, various Alfv{\'e}n eigenmodes are often excited. Bursting toroidal Alfv{\'e}n egenmodes excited by the presence of energetic ions induce appreciable amount of energetic ion loss, but also trigger the formation of internal and edge transport barriers.",

keywords = "Alfv{\'e}n eigenmodes, Interchange instabilities, L-H transition",

author = "K. Toi and S. Ohdachi and S. Yamamoto and S. Sakakibara and Watanabe, \{K. Y.\} and N. Nakajima and X. Ding and J. Li and S. Morita and K. Narihara and K. Tanaka and T. Tokuzawa and H. Yamada and Q. Yang",

year = "2004",

month = jun,

doi = "10.1088/1009-0630/6/3/001",

language = "英语",

volume = "6",

pages = "2269--2274",

journal = "Plasma Science and Technology",

issn = "1009-0630",

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Toi, K, Ohdachi, S, Yamamoto, S, Sakakibara, S, Watanabe, KY, Nakajima, N, Ding, X, Li, J, Morita, S, Narihara, K, Tanaka, K, Tokuzawa, T, Yamada, H & Yang, Q 2004, 'MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection', Plasma Science and Technology, vol. 6, no. 3, pp. 2269-2274. https://doi.org/10.1088/1009-0630/6/3/001

TY - JOUR

T1 - MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection

AU - Toi, K.

AU - Ohdachi, S.

AU - Yamamoto, S.

AU - Sakakibara, S.

AU - Watanabe, K. Y.

AU - Nakajima, N.

AU - Ding, X.

AU - Li, J.

AU - Morita, S.

AU - Narihara, K.

AU - Tanaka, K.

AU - Tokuzawa, T.

AU - Yamada, H.

AU - Yang, Q.

PY - 2004/6

Y1 - 2004/6

N2 - MHD stability of the Large Helical Device (LHD) plasmas produced with intense neutral beam injection is experimentally studied. When the steep pressure gradient near the edge is produced through L-H transition or linear density ramp experiment, interchange-like MHD modes whose rational surface is located very close to the last closed flux surface are strongly excited in a certain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmas produced at low toroidal field, various Alfvén eigenmodes are often excited. Bursting toroidal Alfvén egenmodes excited by the presence of energetic ions induce appreciable amount of energetic ion loss, but also trigger the formation of internal and edge transport barriers.

AB - MHD stability of the Large Helical Device (LHD) plasmas produced with intense neutral beam injection is experimentally studied. When the steep pressure gradient near the edge is produced through L-H transition or linear density ramp experiment, interchange-like MHD modes whose rational surface is located very close to the last closed flux surface are strongly excited in a certain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmas produced at low toroidal field, various Alfvén eigenmodes are often excited. Bursting toroidal Alfvén egenmodes excited by the presence of energetic ions induce appreciable amount of energetic ion loss, but also trigger the formation of internal and edge transport barriers.

KW - Alfvén eigenmodes

KW - Interchange instabilities

KW - L-H transition

UR - https://www.scopus.com/pages/publications/33746343965

U2 - 10.1088/1009-0630/6/3/001

DO - 10.1088/1009-0630/6/3/001

M3 - 文章

AN - SCOPUS:33746343965

SN - 1009-0630

VL - 6

SP - 2269

EP - 2274

JO - Plasma Science and Technology

JF - Plasma Science and Technology

IS - 3

ER -

MHD instabilities and their effects on plasma confinement in large helical device plasmas with intense neutral beam injection

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Keywords

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