Energetic-ion-driven toroidal alfvén eigenmodes observed in a heliotron/torsatron plasma

M. Takechi; K. Toi; S. Takagi; G. Matsunaga; K. Ohkuni; S. Ohdachi; R. Akiyama; D. S. Darrow; A. Fujisawa; M. Gotoh; H. Idei; H. Iguchi; M. Isobe; T. Kondo; M. Kojima; S. Kubo; S. Lee; T. Minami; S. Morita; K. Matsuoka; S. Nishimura; S. Okamura; M. Osakabe; M. Sasao; M. Shimizu; C. Takahashi; K. Tanaka; Y. Yoshimura

doi:10.1103/PhysRevLett.83.312

Energetic-ion-driven toroidal alfvén eigenmodes observed in a heliotron/torsatron plasma

M. Takechi, K. Toi, S. Takagi, G. Matsunaga, K. Ohkuni, S. Ohdachi, R. Akiyama, D. S. Darrow, A. Fujisawa, M. Gotoh, H. Idei, H. Iguchi, M. Isobe, T. Kondo, M. Kojima, S. Kubo, S. Lee, T. Minami, S. Morita, K. MatsuokaS. Nishimura, S. Okamura, M. Osakabe, M. Sasao, M. Shimizu, C. Takahashi, K. Tanaka, Y. Yoshimura

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Abstract

Toroidal Alfvén eigenmodes (TAEs) of low toroidal mode number, n=1 and 2, are observed in neutral-beam-heated plasmas in the compact helical system heliotron/torsatron. The observed frequency is proportional to the computed TAE frequency and lies near the lower bound of the innermost TAE gap. The modes are excited only when the beam velocity exceeds about half the central Alfvén velocity and when the net plasma current induced by coinjected neutral beams is in the required range. The modes are localized in the plasma core region, between 0.2 and 0.6 of the plasma minor radius.

Original language	English
Pages (from-to)	312-315
Number of pages	4
Journal	Physical review letters
Volume	83
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.83.312
Publication status	Published - Jan 1 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.83.312

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Takechi, M., Toi, K., Takagi, S., Matsunaga, G., Ohkuni, K., Ohdachi, S., Akiyama, R., Darrow, D. S., Fujisawa, A., Gotoh, M., Idei, H., Iguchi, H., Isobe, M., Kondo, T., Kojima, M., Kubo, S., Lee, S., Minami, T., Morita, S., ... Yoshimura, Y. (1999). Energetic-ion-driven toroidal alfvén eigenmodes observed in a heliotron/torsatron plasma. Physical review letters, 83(2), 312-315. https://doi.org/10.1103/PhysRevLett.83.312

Takechi, M, Toi, K, Takagi, S, Matsunaga, G, Ohkuni, K, Ohdachi, S, Akiyama, R, Darrow, DS, Fujisawa, A, Gotoh, M, Idei, H, Iguchi, H, Isobe, M, Kondo, T, Kojima, M, Kubo, S, Lee, S, Minami, T, Morita, S, Matsuoka, K, Nishimura, S, Okamura, S, Osakabe, M, Sasao, M, Shimizu, M, Takahashi, C, Tanaka, K & Yoshimura, Y 1999, 'Energetic-ion-driven toroidal alfvén eigenmodes observed in a heliotron/torsatron plasma', Physical review letters, vol. 83, no. 2, pp. 312-315. https://doi.org/10.1103/PhysRevLett.83.312

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title = "Energetic-ion-driven toroidal alfv{\'e}n eigenmodes observed in a heliotron/torsatron plasma",

abstract = "Toroidal Alfv{\'e}n eigenmodes (TAEs) of low toroidal mode number, n=1 and 2, are observed in neutral-beam-heated plasmas in the compact helical system heliotron/torsatron. The observed frequency is proportional to the computed TAE frequency and lies near the lower bound of the innermost TAE gap. The modes are excited only when the beam velocity exceeds about half the central Alfv{\'e}n velocity and when the net plasma current induced by coinjected neutral beams is in the required range. The modes are localized in the plasma core region, between 0.2 and 0.6 of the plasma minor radius.",

author = "M. Takechi and K. Toi and S. Takagi and G. Matsunaga and K. Ohkuni and S. Ohdachi and R. Akiyama and Darrow, {D. S.} and A. Fujisawa and M. Gotoh and H. Idei and H. Iguchi and M. Isobe and T. Kondo and M. Kojima and S. Kubo and S. Lee and T. Minami and S. Morita and K. Matsuoka and S. Nishimura and S. Okamura and M. Osakabe and M. Sasao and M. Shimizu and C. Takahashi and K. Tanaka and Y. Yoshimura",

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doi = "10.1103/PhysRevLett.83.312",

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AU - Takechi, M.

AU - Toi, K.

AU - Takagi, S.

AU - Matsunaga, G.

AU - Ohkuni, K.

AU - Ohdachi, S.

AU - Akiyama, R.

AU - Darrow, D. S.

AU - Fujisawa, A.

AU - Gotoh, M.

AU - Idei, H.

AU - Iguchi, H.

AU - Isobe, M.

AU - Kondo, T.

AU - Kojima, M.

AU - Kubo, S.

AU - Lee, S.

AU - Minami, T.

AU - Morita, S.

AU - Matsuoka, K.

AU - Nishimura, S.

AU - Okamura, S.

AU - Osakabe, M.

AU - Sasao, M.

AU - Shimizu, M.

AU - Takahashi, C.

AU - Tanaka, K.

AU - Yoshimura, Y.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Toroidal Alfvén eigenmodes (TAEs) of low toroidal mode number, n=1 and 2, are observed in neutral-beam-heated plasmas in the compact helical system heliotron/torsatron. The observed frequency is proportional to the computed TAE frequency and lies near the lower bound of the innermost TAE gap. The modes are excited only when the beam velocity exceeds about half the central Alfvén velocity and when the net plasma current induced by coinjected neutral beams is in the required range. The modes are localized in the plasma core region, between 0.2 and 0.6 of the plasma minor radius.

AB - Toroidal Alfvén eigenmodes (TAEs) of low toroidal mode number, n=1 and 2, are observed in neutral-beam-heated plasmas in the compact helical system heliotron/torsatron. The observed frequency is proportional to the computed TAE frequency and lies near the lower bound of the innermost TAE gap. The modes are excited only when the beam velocity exceeds about half the central Alfvén velocity and when the net plasma current induced by coinjected neutral beams is in the required range. The modes are localized in the plasma core region, between 0.2 and 0.6 of the plasma minor radius.

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JF - Physical review letters

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Energetic-ion-driven toroidal alfvén eigenmodes observed in a heliotron/torsatron plasma

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