MHD characteristics in the high beta regime of the Large Helical Device

S. Sakakibara; H. Yamada; K. Y. Watanabe; Y. Narushima; K. Toi; S. Ohdachi; M. Takechi; S. Yamamoto; K. Narihara; K. Tanaka; N. Ashikawa; P. De Vries; M. Emoto; H. Funaba; M. Goto; K. Ida; H. Idei; K. Ikeda; S. Inagaki; N. Inoue; M. Isobe; S. Kado; O. Kaneko; K. Kawahata; K. Khlopenkov; T. Kobuchi; A. Komori; S. Kubo; R. Kumazawa; Y. Liang; S. Masuzaki; T. Minami; J. Miyazawa; T. Morisaki; S. Morita; S. Murakami; S. Muto; T. Mutoh; Y. Nagayama; Y. Nakamura; H. Nakanishi; K. Nishimura; N. Noda; T. Notake; N. Ohyabu; Y. Oka; M. Osakabe; T. Ozaki; R. O. Pavlichenko; B. J. Peterson; A. Sagara; K. Saito; R. Sakamoto; H. Sasao; M. Sasao; K. Sato; M. Sato; T. Seki; T. Shimozuma; M. Shoji; H. Suzuki; Y. Takeiri; N. Tamura; T. Tokuzawa; Y. Torii; K. Tsumori; I. Yamada; S. Yamaguchi; M. Yokoyama; Y. Yoshimura; T. Watari; N. Nakajima; K. Ichiguchi; H. Takahashi; A. W. Cooper; K. Yamazaki; O. Motojima; Y. Hamada; M. Fujiwara

doi:10.1088/0029-5515/41/9/306

MHD characteristics in the high beta regime of the Large Helical Device

S. Sakakibara, H. Yamada, K. Y. Watanabe, Y. Narushima, K. Toi, S. Ohdachi, M. Takechi, S. Yamamoto, K. Narihara, K. Tanaka, N. Ashikawa, P. De Vries, M. Emoto, H. Funaba, M. Goto, K. Ida, H. Idei, K. Ikeda, S. Inagaki, N. InoueM. Isobe, S. Kado, O. Kaneko, K. Kawahata, K. Khlopenkov, T. Kobuchi, A. Komori, S. Kubo, R. Kumazawa, Y. Liang, S. Masuzaki, T. Minami, J. Miyazawa, T. Morisaki, S. Morita, S. Murakami, S. Muto, T. Mutoh, Y. Nagayama, Y. Nakamura, H. Nakanishi, K. Nishimura, N. Noda, T. Notake, N. Ohyabu, Y. Oka, M. Osakabe, T. Ozaki, R. O. Pavlichenko, B. J. Peterson, A. Sagara, K. Saito, R. Sakamoto, H. Sasao, M. Sasao, K. Sato, M. Sato, T. Seki, T. Shimozuma, M. Shoji, H. Suzuki, Y. Takeiri, N. Tamura, T. Tokuzawa, Y. Torii, K. Tsumori, I. Yamada, S. Yamaguchi, M. Yokoyama, Y. Yoshimura, T. Watari, N. Nakajima, K. Ichiguchi, H. Takahashi, A. W. Cooper, K. Yamazaki, O. Motojima, Y. Hamada, M. Fujiwara

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38 Citations (Scopus)

Abstract

The highest volume averaged beta values β_t of 2.2% at B_t = 0.75 T (gas puff) and 2.4% at β_t, = 1.3 T (pellet) in helical devices have been achieved in LHD. The β_t dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with β_t and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high β_t discharges, and the abrupt disappearance of the mode leads to restoration of the T_e profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.

Original language	English
Pages (from-to)	1177-1183
Number of pages	7
Journal	Nuclear Fusion
Volume	41
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/41/9/306
Publication status	Published - Sep 1 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/41/9/306

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Sakakibara, S., Yamada, H., Watanabe, K. Y., Narushima, Y., Toi, K., Ohdachi, S., Takechi, M., Yamamoto, S., Narihara, K., Tanaka, K., Ashikawa, N., De Vries, P., Emoto, M., Funaba, H., Goto, M., Ida, K., Idei, H., Ikeda, K., Inagaki, S., ... Fujiwara, M. (2001). MHD characteristics in the high beta regime of the Large Helical Device. Nuclear Fusion, 41(9), 1177-1183. https://doi.org/10.1088/0029-5515/41/9/306

Sakakibara, S, Yamada, H, Watanabe, KY, Narushima, Y, Toi, K, Ohdachi, S, Takechi, M, Yamamoto, S, Narihara, K, Tanaka, K, Ashikawa, N, De Vries, P, Emoto, M, Funaba, H, Goto, M, Ida, K, Idei, H, Ikeda, K, Inagaki, S, Inoue, N, Isobe, M, Kado, S, Kaneko, O, Kawahata, K, Khlopenkov, K, Kobuchi, T, Komori, A, Kubo, S, Kumazawa, R, Liang, Y, Masuzaki, S, Minami, T, Miyazawa, J, Morisaki, T, Morita, S, Murakami, S, Muto, S, Mutoh, T, Nagayama, Y, Nakamura, Y, Nakanishi, H, Nishimura, K, Noda, N, Notake, T, Ohyabu, N, Oka, Y, Osakabe, M, Ozaki, T, Pavlichenko, RO, Peterson, BJ, Sagara, A, Saito, K, Sakamoto, R, Sasao, H, Sasao, M, Sato, K, Sato, M, Seki, T, Shimozuma, T, Shoji, M, Suzuki, H, Takeiri, Y, Tamura, N, Tokuzawa, T, Torii, Y, Tsumori, K, Yamada, I, Yamaguchi, S, Yokoyama, M, Yoshimura, Y, Watari, T, Nakajima, N, Ichiguchi, K, Takahashi, H, Cooper, AW, Yamazaki, K, Motojima, O, Hamada, Y & Fujiwara, M 2001, 'MHD characteristics in the high beta regime of the Large Helical Device', Nuclear Fusion, vol. 41, no. 9, pp. 1177-1183. https://doi.org/10.1088/0029-5515/41/9/306

@article{a221af0e635a4786ba39329b6909ff4b,

title = "MHD characteristics in the high beta regime of the Large Helical Device",

abstract = "The highest volume averaged beta values βt of 2.2% at Bt = 0.75 T (gas puff) and 2.4% at βt, = 1.3 T (pellet) in helical devices have been achieved in LHD. The βt dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with βt and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high βt discharges, and the abrupt disappearance of the mode leads to restoration of the Te profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.",

author = "S. Sakakibara and H. Yamada and Watanabe, {K. Y.} and Y. Narushima and K. Toi and S. Ohdachi and M. Takechi and S. Yamamoto and K. Narihara and K. Tanaka and N. Ashikawa and {De Vries}, P. and M. Emoto and H. Funaba and M. Goto and K. Ida and H. Idei and K. Ikeda and S. Inagaki and N. Inoue and M. Isobe and S. Kado and O. Kaneko and K. Kawahata and K. Khlopenkov and T. Kobuchi and A. Komori and S. Kubo and R. Kumazawa and Y. Liang and S. Masuzaki and T. Minami and J. Miyazawa and T. Morisaki and S. Morita and S. Murakami and S. Muto and T. Mutoh and Y. Nagayama and Y. Nakamura and H. Nakanishi and K. Nishimura and N. Noda and T. Notake and N. Ohyabu and Y. Oka and M. Osakabe and T. Ozaki and Pavlichenko, {R. O.} and Peterson, {B. J.} and A. Sagara and K. Saito and R. Sakamoto and H. Sasao and M. Sasao and K. Sato and M. Sato and T. Seki and T. Shimozuma and M. Shoji and H. Suzuki and Y. Takeiri and N. Tamura and T. Tokuzawa and Y. Torii and K. Tsumori and I. Yamada and S. Yamaguchi and M. Yokoyama and Y. Yoshimura and T. Watari and N. Nakajima and K. Ichiguchi and H. Takahashi and Cooper, {A. W.} and K. Yamazaki and O. Motojima and Y. Hamada and M. Fujiwara",

year = "2001",

month = sep,

day = "1",

doi = "10.1088/0029-5515/41/9/306",

language = "English",

volume = "41",

pages = "1177--1183",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "9",

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TY - JOUR

T1 - MHD characteristics in the high beta regime of the Large Helical Device

AU - Sakakibara, S.

AU - Yamada, H.

AU - Watanabe, K. Y.

AU - Narushima, Y.

AU - Toi, K.

AU - Ohdachi, S.

AU - Takechi, M.

AU - Yamamoto, S.

AU - Narihara, K.

AU - Tanaka, K.

AU - Ashikawa, N.

AU - De Vries, P.

AU - Emoto, M.

AU - Funaba, H.

AU - Goto, M.

AU - Ida, K.

AU - Idei, H.

AU - Ikeda, K.

AU - Inagaki, S.

AU - Inoue, N.

AU - Isobe, M.

AU - Kado, S.

AU - Kaneko, O.

AU - Kawahata, K.

AU - Khlopenkov, K.

AU - Kobuchi, T.

AU - Komori, A.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Liang, Y.

AU - Masuzaki, S.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Murakami, S.

AU - Muto, S.

AU - Mutoh, T.

AU - Nagayama, Y.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Nishimura, K.

AU - Noda, N.

AU - Notake, T.

AU - Ohyabu, N.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Pavlichenko, R. O.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Saito, K.

AU - Sakamoto, R.

AU - Sasao, H.

AU - Sasao, M.

AU - Sato, K.

AU - Sato, M.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Suzuki, H.

AU - Takeiri, Y.

AU - Tamura, N.

AU - Tokuzawa, T.

AU - Torii, Y.

AU - Tsumori, K.

AU - Yamada, I.

AU - Yamaguchi, S.

AU - Yokoyama, M.

AU - Yoshimura, Y.

AU - Watari, T.

AU - Nakajima, N.

AU - Ichiguchi, K.

AU - Takahashi, H.

AU - Cooper, A. W.

AU - Yamazaki, K.

AU - Motojima, O.

AU - Hamada, Y.

AU - Fujiwara, M.

PY - 2001/9/1

Y1 - 2001/9/1

N2 - The highest volume averaged beta values βt of 2.2% at Bt = 0.75 T (gas puff) and 2.4% at βt, = 1.3 T (pellet) in helical devices have been achieved in LHD. The βt dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with βt and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high βt discharges, and the abrupt disappearance of the mode leads to restoration of the Te profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.

AB - The highest volume averaged beta values βt of 2.2% at Bt = 0.75 T (gas puff) and 2.4% at βt, = 1.3 T (pellet) in helical devices have been achieved in LHD. The βt dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with βt and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high βt discharges, and the abrupt disappearance of the mode leads to restoration of the Te profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.

UR - http://www.scopus.com/inward/record.url?scp=0035470102&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035470102&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/41/9/306

DO - 10.1088/0029-5515/41/9/306

M3 - Article

AN - SCOPUS:0035470102

VL - 41

SP - 1177

EP - 1183

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 9

ER -

MHD characteristics in the high beta regime of the Large Helical Device

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