Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments

H. Kimura; M. Saigusa; S. Moriyama; T. Kondoh; Y. Neyatani; T. Ozeki; T. Nishitani; Y. Kusama; T. Fujii; M. Sato; M. Memoto; K. Tobita; C. Z. Cheng

doi:10.1016/0375-9601(95)00052-5

Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments

H. Kimura, M. Saigusa, S. Moriyama, T. Kondoh, Y. Neyatani, T. Ozeki, T. Nishitani, Y. Kusama, T. Fujii, M. Sato, M. Memoto, K. Tobita, C. Z. Cheng

Institute of Space and Plasma Sciences

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

36 Citations (Scopus)

Abstract

High frequency MHD activities observed during second harmonic ICRF heating are identified to be toroidicity-induced Alfvén eigenmodes (TAE) driven by MeV protons produced by ICRF heating. Correlation between MeV protons and TAE modes is clearly observed. TAE mode amplitude increases exponentially with increasing toroidal mode number up to more than ten. The tendency cannot be explained by present local TAE stability theories. Long suppression of TAE modes after a giant sawtooth crash can be explained by fast ion loss due to the sawtooth crash and evolving q-profile.

Original language	English
Pages (from-to)	86-92
Number of pages	7
Journal	Physics Letters A
Volume	199
Issue number	1-2
DOIs	https://doi.org/10.1016/0375-9601(95)00052-5
Publication status	Published - 1995 Mar 20

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1016/0375-9601(95)00052-5

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Kimura, H., Saigusa, M., Moriyama, S., Kondoh, T., Neyatani, Y., Ozeki, T., Nishitani, T., Kusama, Y., Fujii, T., Sato, M., Memoto, M., Tobita, K., & Cheng, C. Z. (1995). Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments. Physics Letters A, 199(1-2), 86-92. https://doi.org/10.1016/0375-9601(95)00052-5

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title = "Excitation of high n toroidicity-induced Alfv{\'e}n eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments",

abstract = "High frequency MHD activities observed during second harmonic ICRF heating are identified to be toroidicity-induced Alfv{\'e}n eigenmodes (TAE) driven by MeV protons produced by ICRF heating. Correlation between MeV protons and TAE modes is clearly observed. TAE mode amplitude increases exponentially with increasing toroidal mode number up to more than ten. The tendency cannot be explained by present local TAE stability theories. Long suppression of TAE modes after a giant sawtooth crash can be explained by fast ion loss due to the sawtooth crash and evolving q-profile.",

author = "H. Kimura and M. Saigusa and S. Moriyama and T. Kondoh and Y. Neyatani and T. Ozeki and T. Nishitani and Y. Kusama and T. Fujii and M. Sato and M. Memoto and K. Tobita and Cheng, {C. Z.}",

year = "1995",

month = mar,

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doi = "10.1016/0375-9601(95)00052-5",

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Kimura, H, Saigusa, M, Moriyama, S, Kondoh, T, Neyatani, Y, Ozeki, T, Nishitani, T, Kusama, Y, Fujii, T, Sato, M, Memoto, M, Tobita, K & Cheng, CZ 1995, 'Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments', Physics Letters A, vol. 199, no. 1-2, pp. 86-92. https://doi.org/10.1016/0375-9601(95)00052-5

TY - JOUR

T1 - Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments

AU - Kimura, H.

AU - Saigusa, M.

AU - Moriyama, S.

AU - Kondoh, T.

AU - Neyatani, Y.

AU - Ozeki, T.

AU - Nishitani, T.

AU - Kusama, Y.

AU - Fujii, T.

AU - Sato, M.

AU - Memoto, M.

AU - Tobita, K.

AU - Cheng, C. Z.

PY - 1995/3/20

Y1 - 1995/3/20

N2 - High frequency MHD activities observed during second harmonic ICRF heating are identified to be toroidicity-induced Alfvén eigenmodes (TAE) driven by MeV protons produced by ICRF heating. Correlation between MeV protons and TAE modes is clearly observed. TAE mode amplitude increases exponentially with increasing toroidal mode number up to more than ten. The tendency cannot be explained by present local TAE stability theories. Long suppression of TAE modes after a giant sawtooth crash can be explained by fast ion loss due to the sawtooth crash and evolving q-profile.

AB - High frequency MHD activities observed during second harmonic ICRF heating are identified to be toroidicity-induced Alfvén eigenmodes (TAE) driven by MeV protons produced by ICRF heating. Correlation between MeV protons and TAE modes is clearly observed. TAE mode amplitude increases exponentially with increasing toroidal mode number up to more than ten. The tendency cannot be explained by present local TAE stability theories. Long suppression of TAE modes after a giant sawtooth crash can be explained by fast ion loss due to the sawtooth crash and evolving q-profile.

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U2 - 10.1016/0375-9601(95)00052-5

DO - 10.1016/0375-9601(95)00052-5

M3 - Article

AN - SCOPUS:0001832673

SN - 0375-9601

VL - 199

SP - 86

EP - 92

JO - Physics Letters A

JF - Physics Letters A

IS - 1-2

ER -

Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments

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