Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U

Y. Kusama; G. J. Kramer; H. Kimura; M. Saigusa; T. Ozeki; K. Tobita; T. Oikawa; K. Shinohara; T. Kondoh; M. Moriyama; F. V. Tchernychev; M. Nemoto; A. Morioka; M. Iwase; N. Isei; T. Fujita; S. Takeji; M. Kuriyama; R. Nazikian; G. Y. Fu; K. W. Hill; C. Z. Cheng

doi:10.1088/0029-5515/39/11Y/324

Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U

Y. Kusama, G. J. Kramer, H. Kimura, M. Saigusa, T. Ozeki, K. Tobita, T. Oikawa, K. Shinohara, T. Kondoh, M. Moriyama, F. V. Tchernychev, M. Nemoto, A. Morioka, M. Iwase, N. Isei, T. Fujita, S. Takeji, M. Kuriyama, R. Nazikian, G. Y. FuK. W. Hill, C. Z. Cheng

ENG - Quantum Science and Energy Engineering

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Abstract

The excitation and stabilization of Alfven eigenmodes and their impact on energetic ion confinement were investigated with negative ion based neutral beam injection at 330-360 keV into weak or reversed magnetic shear plasmas on JT-60U. Toroidicity induced Alfven eigenmodes (TAEs) were observed in weak shear plasmas with 〈β_h〉≥0.1% and 0.4≤v_b∥/v_A≤1. The stability of TAEs is consistent with predictions by the NOVA-K code. New burst modes and chirping modes were observed in the higher β regime of 〈β_h〉≥0.2%. The effect of TAEs, burst modes and chirping modes on fast ion confinement has been found to be small so far. It was found that a strongly reversed shear plasma with internal transport barrier suppresses AEs.

Original language	English
Pages (from-to)	1837-1843
Number of pages	7
Journal	Nuclear Fusion
Volume	39
Issue number	Special Issu
DOIs	https://doi.org/10.1088/0029-5515/39/11Y/324
Publication status	Published - 1999

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Kusama, Y., Kramer, G. J., Kimura, H., Saigusa, M., Ozeki, T., Tobita, K., Oikawa, T., Shinohara, K., Kondoh, T., Moriyama, M., Tchernychev, F. V., Nemoto, M., Morioka, A., Iwase, M., Isei, N., Fujita, T., Takeji, S., Kuriyama, M., Nazikian, R., ... Cheng, C. Z. (1999). Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U. Nuclear Fusion, 39(Special Issu), 1837-1843. https://doi.org/10.1088/0029-5515/39/11Y/324

@article{dc5a4d00d64f4f3ea7203838ae005b89,

title = "Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U",

abstract = "The excitation and stabilization of Alfven eigenmodes and their impact on energetic ion confinement were investigated with negative ion based neutral beam injection at 330-360 keV into weak or reversed magnetic shear plasmas on JT-60U. Toroidicity induced Alfven eigenmodes (TAEs) were observed in weak shear plasmas with 〈βh〉≥0.1% and 0.4≤vb∥/vA≤1. The stability of TAEs is consistent with predictions by the NOVA-K code. New burst modes and chirping modes were observed in the higher β regime of 〈βh〉≥0.2%. The effect of TAEs, burst modes and chirping modes on fast ion confinement has been found to be small so far. It was found that a strongly reversed shear plasma with internal transport barrier suppresses AEs.",

author = "Y. Kusama and Kramer, {G. J.} and H. Kimura and M. Saigusa and T. Ozeki and K. Tobita and T. Oikawa and K. Shinohara and T. Kondoh and M. Moriyama and Tchernychev, {F. V.} and M. Nemoto and A. Morioka and M. Iwase and N. Isei and T. Fujita and S. Takeji and M. Kuriyama and R. Nazikian and Fu, {G. Y.} and Hill, {K. W.} and Cheng, {C. Z.}",

year = "1999",

doi = "10.1088/0029-5515/39/11Y/324",

language = "English",

volume = "39",

pages = "1837--1843",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "Special Issu",

}

Kusama, Y, Kramer, GJ, Kimura, H, Saigusa, M, Ozeki, T, Tobita, K, Oikawa, T, Shinohara, K, Kondoh, T, Moriyama, M, Tchernychev, FV, Nemoto, M, Morioka, A, Iwase, M, Isei, N, Fujita, T, Takeji, S, Kuriyama, M, Nazikian, R, Fu, GY, Hill, KW & Cheng, CZ 1999, 'Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U', Nuclear Fusion, vol. 39, no. Special Issu, pp. 1837-1843. https://doi.org/10.1088/0029-5515/39/11Y/324

TY - JOUR

T1 - Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U

AU - Kusama, Y.

AU - Kramer, G. J.

AU - Kimura, H.

AU - Saigusa, M.

AU - Ozeki, T.

AU - Tobita, K.

AU - Oikawa, T.

AU - Shinohara, K.

AU - Kondoh, T.

AU - Moriyama, M.

AU - Tchernychev, F. V.

AU - Nemoto, M.

AU - Morioka, A.

AU - Iwase, M.

AU - Isei, N.

AU - Fujita, T.

AU - Takeji, S.

AU - Kuriyama, M.

AU - Nazikian, R.

AU - Fu, G. Y.

AU - Hill, K. W.

AU - Cheng, C. Z.

PY - 1999

Y1 - 1999

N2 - The excitation and stabilization of Alfven eigenmodes and their impact on energetic ion confinement were investigated with negative ion based neutral beam injection at 330-360 keV into weak or reversed magnetic shear plasmas on JT-60U. Toroidicity induced Alfven eigenmodes (TAEs) were observed in weak shear plasmas with 〈βh〉≥0.1% and 0.4≤vb∥/vA≤1. The stability of TAEs is consistent with predictions by the NOVA-K code. New burst modes and chirping modes were observed in the higher β regime of 〈βh〉≥0.2%. The effect of TAEs, burst modes and chirping modes on fast ion confinement has been found to be small so far. It was found that a strongly reversed shear plasma with internal transport barrier suppresses AEs.

AB - The excitation and stabilization of Alfven eigenmodes and their impact on energetic ion confinement were investigated with negative ion based neutral beam injection at 330-360 keV into weak or reversed magnetic shear plasmas on JT-60U. Toroidicity induced Alfven eigenmodes (TAEs) were observed in weak shear plasmas with 〈βh〉≥0.1% and 0.4≤vb∥/vA≤1. The stability of TAEs is consistent with predictions by the NOVA-K code. New burst modes and chirping modes were observed in the higher β regime of 〈βh〉≥0.2%. The effect of TAEs, burst modes and chirping modes on fast ion confinement has been found to be small so far. It was found that a strongly reversed shear plasma with internal transport barrier suppresses AEs.

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UR - http://www.scopus.com/inward/citedby.url?scp=12944253109&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/39/11Y/324

DO - 10.1088/0029-5515/39/11Y/324

M3 - Article

AN - SCOPUS:12944253109

SN - 0029-5515

VL - 39

SP - 1837

EP - 1843

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - Special Issu

ER -

Characteristics of Alfven eigenmodes, burst modes and chirping modes in the Alfven frequency range driven by negative ion based neutral beam injection in JT-60U

Abstract

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