Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device

H. Yamada; K. Y. Watanabe; S. Sakakibara; S. Murakami; M. Osakabe; O. Kaneko; K. Narihara; K. Tanaka; K. Ida; T. Minami; M. Goto; H. Idei; S. Inagaki; S. Kado; K. Kawahata; A. Komori; S. Kubo; J. Miyazawa; T. Morisaki; S. Morita; H. Nakanishi; S. Ohdachi; N. Ohyabu; Y. Oka; B. J. Peterson; R. Sakamoto; M. Shoji; H. Suzuki; Y. Takeiri; K. Toi; T. Tokuzawa; T. Tsumori; I. Yamada; K. Ohkubo; S. Sudo; K. Yamazaki; O. Motojima; M. Fujiwara

doi:10.1103/PhysRevLett.84.1216

Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device

H. Yamada, K. Y. Watanabe, S. Sakakibara, S. Murakami, M. Osakabe, O. Kaneko, K. Narihara, K. Tanaka, K. Ida, T. Minami, M. Goto, H. Idei, S. Inagaki, S. Kado, K. Kawahata, A. Komori, S. Kubo, J. Miyazawa, T. Morisaki, S. MoritaH. Nakanishi, S. Ohdachi, N. Ohyabu, Y. Oka, B. J. Peterson, R. Sakamoto, M. Shoji, H. Suzuki, Y. Takeiri, K. Toi, T. Tokuzawa, T. Tsumori, I. Yamada, K. Ohkubo, S. Sudo, K. Yamazaki, O. Motojima, M. Fujiwara

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Abstract

The confinement characteristics of large net-current-free plasmas heated by neutral-beam injection have been investigated in the Large Helical Device (LHD). A systematic enhancement in energy-confinement times from the scaling derived from the medium-sized heliotron/torsatron experiments have been observed, which is attributed to the edge pedestal. The core confinement is scaled with the Bohm term divided by the square root of the gyro radii. The comparative analysis using a dimensionally similar discharge in the Compact Helical System indicates gyro-Bohm dependence in the core and transport improvement in the edge region of LHD plasmas.

Original language	English
Pages (from-to)	1216-1219
Number of pages	4
Journal	Physical review letters
Volume	84
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.84.1216
Publication status	Published - 2000
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.84.1216

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Yamada, H., Watanabe, K. Y., Sakakibara, S., Murakami, S., Osakabe, M., Kaneko, O., Narihara, K., Tanaka, K., Ida, K., Minami, T., Goto, M., Idei, H., Inagaki, S., Kado, S., Kawahata, K., Komori, A., Kubo, S., Miyazawa, J., Morisaki, T., ... Fujiwara, M. (2000). Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device. Physical review letters, 84(6), 1216-1219. https://doi.org/10.1103/PhysRevLett.84.1216

Yamada, H, Watanabe, KY, Sakakibara, S, Murakami, S, Osakabe, M, Kaneko, O, Narihara, K, Tanaka, K, Ida, K, Minami, T, Goto, M, Idei, H, Inagaki, S, Kado, S, Kawahata, K, Komori, A, Kubo, S, Miyazawa, J, Morisaki, T, Morita, S, Nakanishi, H, Ohdachi, S, Ohyabu, N, Oka, Y, Peterson, BJ, Sakamoto, R, Shoji, M, Suzuki, H, Takeiri, Y, Toi, K, Tokuzawa, T, Tsumori, T, Yamada, I, Ohkubo, K, Sudo, S, Yamazaki, K, Motojima, O & Fujiwara, M 2000, 'Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device', Physical review letters, vol. 84, no. 6, pp. 1216-1219. https://doi.org/10.1103/PhysRevLett.84.1216

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title = "Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device",

abstract = "The confinement characteristics of large net-current-free plasmas heated by neutral-beam injection have been investigated in the Large Helical Device (LHD). A systematic enhancement in energy-confinement times from the scaling derived from the medium-sized heliotron/torsatron experiments have been observed, which is attributed to the edge pedestal. The core confinement is scaled with the Bohm term divided by the square root of the gyro radii. The comparative analysis using a dimensionally similar discharge in the Compact Helical System indicates gyro-Bohm dependence in the core and transport improvement in the edge region of LHD plasmas.",

author = "H. Yamada and Watanabe, {K. Y.} and S. Sakakibara and S. Murakami and M. Osakabe and O. Kaneko and K. Narihara and K. Tanaka and K. Ida and T. Minami and M. Goto and H. Idei and S. Inagaki and S. Kado and K. Kawahata and A. Komori and S. Kubo and J. Miyazawa and T. Morisaki and S. Morita and H. Nakanishi and S. Ohdachi and N. Ohyabu and Y. Oka and Peterson, {B. J.} and R. Sakamoto and M. Shoji and H. Suzuki and Y. Takeiri and K. Toi and T. Tokuzawa and T. Tsumori and I. Yamada and K. Ohkubo and S. Sudo and K. Yamazaki and O. Motojima and M. Fujiwara",

year = "2000",

doi = "10.1103/PhysRevLett.84.1216",

language = "English",

volume = "84",

pages = "1216--1219",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

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TY - JOUR

T1 - Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device

AU - Yamada, H.

AU - Watanabe, K. Y.

AU - Sakakibara, S.

AU - Murakami, S.

AU - Osakabe, M.

AU - Kaneko, O.

AU - Narihara, K.

AU - Tanaka, K.

AU - Ida, K.

AU - Minami, T.

AU - Goto, M.

AU - Idei, H.

AU - Inagaki, S.

AU - Kado, S.

AU - Kawahata, K.

AU - Komori, A.

AU - Kubo, S.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Nakanishi, H.

AU - Ohdachi, S.

AU - Ohyabu, N.

AU - Oka, Y.

AU - Peterson, B. J.

AU - Sakamoto, R.

AU - Shoji, M.

AU - Suzuki, H.

AU - Takeiri, Y.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Tsumori, T.

AU - Yamada, I.

AU - Ohkubo, K.

AU - Sudo, S.

AU - Yamazaki, K.

AU - Motojima, O.

AU - Fujiwara, M.

PY - 2000

Y1 - 2000

N2 - The confinement characteristics of large net-current-free plasmas heated by neutral-beam injection have been investigated in the Large Helical Device (LHD). A systematic enhancement in energy-confinement times from the scaling derived from the medium-sized heliotron/torsatron experiments have been observed, which is attributed to the edge pedestal. The core confinement is scaled with the Bohm term divided by the square root of the gyro radii. The comparative analysis using a dimensionally similar discharge in the Compact Helical System indicates gyro-Bohm dependence in the core and transport improvement in the edge region of LHD plasmas.

AB - The confinement characteristics of large net-current-free plasmas heated by neutral-beam injection have been investigated in the Large Helical Device (LHD). A systematic enhancement in energy-confinement times from the scaling derived from the medium-sized heliotron/torsatron experiments have been observed, which is attributed to the edge pedestal. The core confinement is scaled with the Bohm term divided by the square root of the gyro radii. The comparative analysis using a dimensionally similar discharge in the Compact Helical System indicates gyro-Bohm dependence in the core and transport improvement in the edge region of LHD plasmas.

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U2 - 10.1103/PhysRevLett.84.1216

DO - 10.1103/PhysRevLett.84.1216

M3 - Article

AN - SCOPUS:0001200076

SN - 0031-9007

VL - 84

SP - 1216

EP - 1219

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

ER -

Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device

Abstract

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