Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U

Y. Kusama; G. Y. Fu; G. J. Kramer; M. Saigusa; T. Oikawa; T. Ozeki; S. Moriyama; F. V. Tchernychev; M. Nemoto; T. Kondoh; T. Hatae; K. Tobita; M. Kuriyama; C. Z. Cheng; H. Kimura

doi:10.1088/0741-3335/41/9/308

Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U

Y. Kusama, G. Y. Fu, G. J. Kramer, M. Saigusa, T. Oikawa, T. Ozeki, S. Moriyama, F. V. Tchernychev, M. Nemoto, T. Kondoh, T. Hatae, K. Tobita, M. Kuriyama, C. Z. Cheng, H. Kimura

ENG - Quantum Science and Energy Engineering

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

5 Citations (Scopus)

Abstract

High-frequency modes in the 525-550 kHz range with toroidal mode numbers n = 3-7 were excited after the sawtooth crash during ion cyclotron range of frequency (ICRF) heating. Based on the stability analysis using the NOVA-K code, these modes were found to be consistent with ellipticity-induced Alfvén eigenmodes (EAEs) excited in the EAE gap located at the q = 1 surface. A change in the safety factor after the sawtooth crash was essential for the excitation of EAEs in the core region of the plasma. The high-frequency modes were stabilized by the neutral beam injection at 350 keV using negative-ion-based neutral beam (NNB) injectors. Stability analysis using the NOVA-K code has shown that NNB-injected ions enhance the damping of the EAEs and tend to stabilize them.

Original language	English
Pages (from-to)	1167-1177
Number of pages	11
Journal	Plasma Physics and Controlled Fusion
Volume	41
Issue number	9
DOIs	https://doi.org/10.1088/0741-3335/41/9/308
Publication status	Published - 1999 Sept

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Kusama, Y., Fu, G. Y., Kramer, G. J., Saigusa, M., Oikawa, T., Ozeki, T., Moriyama, S., Tchernychev, F. V., Nemoto, M., Kondoh, T., Hatae, T., Tobita, K., Kuriyama, M., Cheng, C. Z., & Kimura, H. (1999). Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U. Plasma Physics and Controlled Fusion, 41(9), 1167-1177. https://doi.org/10.1088/0741-3335/41/9/308

@article{e33b2da0156044b4a930af763a462884,

title = "Destabilization of ellipticity-induced Alfv{\'e}n eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U",

abstract = "High-frequency modes in the 525-550 kHz range with toroidal mode numbers n = 3-7 were excited after the sawtooth crash during ion cyclotron range of frequency (ICRF) heating. Based on the stability analysis using the NOVA-K code, these modes were found to be consistent with ellipticity-induced Alfv{\'e}n eigenmodes (EAEs) excited in the EAE gap located at the q = 1 surface. A change in the safety factor after the sawtooth crash was essential for the excitation of EAEs in the core region of the plasma. The high-frequency modes were stabilized by the neutral beam injection at 350 keV using negative-ion-based neutral beam (NNB) injectors. Stability analysis using the NOVA-K code has shown that NNB-injected ions enhance the damping of the EAEs and tend to stabilize them.",

author = "Y. Kusama and Fu, {G. Y.} and Kramer, {G. J.} and M. Saigusa and T. Oikawa and T. Ozeki and S. Moriyama and Tchernychev, {F. V.} and M. Nemoto and T. Kondoh and T. Hatae and K. Tobita and M. Kuriyama and Cheng, {C. Z.} and H. Kimura",

year = "1999",

month = sep,

doi = "10.1088/0741-3335/41/9/308",

language = "English",

volume = "41",

pages = "1167--1177",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "9",

}

Kusama, Y, Fu, GY, Kramer, GJ, Saigusa, M, Oikawa, T, Ozeki, T, Moriyama, S, Tchernychev, FV, Nemoto, M, Kondoh, T, Hatae, T, Tobita, K, Kuriyama, M, Cheng, CZ & Kimura, H 1999, 'Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U', Plasma Physics and Controlled Fusion, vol. 41, no. 9, pp. 1167-1177. https://doi.org/10.1088/0741-3335/41/9/308

TY - JOUR

T1 - Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U

AU - Kusama, Y.

AU - Fu, G. Y.

AU - Kramer, G. J.

AU - Saigusa, M.

AU - Oikawa, T.

AU - Ozeki, T.

AU - Moriyama, S.

AU - Tchernychev, F. V.

AU - Nemoto, M.

AU - Kondoh, T.

AU - Hatae, T.

AU - Tobita, K.

AU - Kuriyama, M.

AU - Cheng, C. Z.

AU - Kimura, H.

PY - 1999/9

Y1 - 1999/9

N2 - High-frequency modes in the 525-550 kHz range with toroidal mode numbers n = 3-7 were excited after the sawtooth crash during ion cyclotron range of frequency (ICRF) heating. Based on the stability analysis using the NOVA-K code, these modes were found to be consistent with ellipticity-induced Alfvén eigenmodes (EAEs) excited in the EAE gap located at the q = 1 surface. A change in the safety factor after the sawtooth crash was essential for the excitation of EAEs in the core region of the plasma. The high-frequency modes were stabilized by the neutral beam injection at 350 keV using negative-ion-based neutral beam (NNB) injectors. Stability analysis using the NOVA-K code has shown that NNB-injected ions enhance the damping of the EAEs and tend to stabilize them.

AB - High-frequency modes in the 525-550 kHz range with toroidal mode numbers n = 3-7 were excited after the sawtooth crash during ion cyclotron range of frequency (ICRF) heating. Based on the stability analysis using the NOVA-K code, these modes were found to be consistent with ellipticity-induced Alfvén eigenmodes (EAEs) excited in the EAE gap located at the q = 1 surface. A change in the safety factor after the sawtooth crash was essential for the excitation of EAEs in the core region of the plasma. The high-frequency modes were stabilized by the neutral beam injection at 350 keV using negative-ion-based neutral beam (NNB) injectors. Stability analysis using the NOVA-K code has shown that NNB-injected ions enhance the damping of the EAEs and tend to stabilize them.

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AN - SCOPUS:0032655240

SN - 0741-3335

VL - 41

SP - 1167

EP - 1177

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 9

ER -

Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U

Abstract

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