Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device

Y. Nagayama; K. Kawahata; Inagaki Shigeru; B. J. Peterson; S. Sakakibara; K. Tanaka; T. Tokuzawa; K. Y. Watanabe; N. Ashikawa; H. Chikaraishi; M. Emoto; H. Funaba; M. Goto; Y. Hamada; K. Ichiguchi; K. Ida; H. Idei; T. Ido; K. Ikeda; S. Imagawa; A. Isayama; M. Isobe; A. Iwamoto; O. Kaneko; S. Kitagawa; A. Komori; S. Kubo; R. Kumazawa; S. Masuzaki; K. Matsuoka; T. Mito; J. Miyazawa; T. Morisaki; S. Morita; O. Motojima; S. Murakami; T. Mutoh; S. Muto; N. Nakajima; Y. Nakamura; H. Nakanishi; K. Narihara; Y. Narushima; A. Nishimura; K. Nishimura; A. Nishizawa; N. Noda; S. Ohdachi; K. Ohkubo; N. Ohyabu; Y. Oka; M. Osakabe; T. Ozaki; A. Sagara; K. Saito; R. Sakamoto; M. Sasao; K. Sato; T. Seki; T. Shimozuma; M. Shoji; H. Suzuki; S. Sudo; K. Takahata; Y. Takeiri; K. Toi; K. Tsumori; H. Yamada; I. Yamada; K. Yamazaki; N. Yanagi; M. Yokoyama; Y. Yoshimura; Y. Yoshinuma; T. Watari

doi:10.1103/PhysRevLett.90.205001

Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device

Y. Nagayama, K. Kawahata, Inagaki Shigeru, B. J. Peterson, S. Sakakibara, K. Tanaka, T. Tokuzawa, K. Y. Watanabe, N. Ashikawa, H. Chikaraishi, M. Emoto, H. Funaba, M. Goto, Y. Hamada, K. Ichiguchi, K. Ida, H. Idei, T. Ido, K. Ikeda, S. ImagawaA. Isayama, M. Isobe, A. Iwamoto, O. Kaneko, S. Kitagawa, A. Komori, S. Kubo, R. Kumazawa, S. Masuzaki, K. Matsuoka, T. Mito, J. Miyazawa, T. Morisaki, S. Morita, O. Motojima, S. Murakami, T. Mutoh, S. Muto, N. Nakajima, Y. Nakamura, H. Nakanishi, K. Narihara, Y. Narushima, A. Nishimura, K. Nishimura, A. Nishizawa, N. Noda, S. Ohdachi, K. Ohkubo, N. Ohyabu, Y. Oka, M. Osakabe, T. Ozaki, A. Sagara, K. Saito, R. Sakamoto, M. Sasao, K. Sato, T. Seki, T. Shimozuma, M. Shoji, H. Suzuki, S. Sudo, K. Takahata, Y. Takeiri, K. Toi, K. Tsumori, H. Yamada, I. Yamada, K. Yamazaki, N. Yanagi, M. Yokoyama, Y. Yoshimura, Y. Yoshinuma, T. Watari

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Abstract

Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.

Original language	English
Number of pages	1
Journal	Physical Review Letters
Volume	90
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.90.205001
Publication status	Published - Jan 1 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.90.205001

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Nagayama, Y., Kawahata, K., Shigeru, I., Peterson, B. J., Sakakibara, S., Tanaka, K., Tokuzawa, T., Watanabe, K. Y., Ashikawa, N., Chikaraishi, H., Emoto, M., Funaba, H., Goto, M., Hamada, Y., Ichiguchi, K., Ida, K., Idei, H., Ido, T., Ikeda, K., ... Watari, T. (2003). Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device. Physical Review Letters, 90(20). https://doi.org/10.1103/PhysRevLett.90.205001

Nagayama, Y, Kawahata, K, Shigeru, I, Peterson, BJ, Sakakibara, S, Tanaka, K, Tokuzawa, T, Watanabe, KY, Ashikawa, N, Chikaraishi, H, Emoto, M, Funaba, H, Goto, M, Hamada, Y, Ichiguchi, K, Ida, K, Idei, H , Ido, T, Ikeda, K, Imagawa, S, Isayama, A, Isobe, M, Iwamoto, A, Kaneko, O, Kitagawa, S, Komori, A, Kubo, S, Kumazawa, R, Masuzaki, S, Matsuoka, K, Mito, T, Miyazawa, J, Morisaki, T, Morita, S, Motojima, O, Murakami, S, Mutoh, T, Muto, S, Nakajima, N, Nakamura, Y, Nakanishi, H, Narihara, K, Narushima, Y, Nishimura, A, Nishimura, K, Nishizawa, A, Noda, N, Ohdachi, S, Ohkubo, K, Ohyabu, N, Oka, Y, Osakabe, M, Ozaki, T, Sagara, A, Saito, K, Sakamoto, R, Sasao, M, Sato, K, Seki, T, Shimozuma, T, Shoji, M, Suzuki, H, Sudo, S, Takahata, K, Takeiri, Y, Toi, K, Tsumori, K, Yamada, H, Yamada, I, Yamazaki, K, Yanagi, N, Yokoyama, M, Yoshimura, Y, Yoshinuma, Y & Watari, T 2003, 'Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device', Physical Review Letters, vol. 90, no. 20. https://doi.org/10.1103/PhysRevLett.90.205001

@article{84e8319b9f0b4c1c8b63ce76fa3c8ea4,

title = "Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device",

abstract = "Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.",

author = "Y. Nagayama and K. Kawahata and Inagaki Shigeru and Peterson, {B. J.} and S. Sakakibara and K. Tanaka and T. Tokuzawa and Watanabe, {K. Y.} and N. Ashikawa and H. Chikaraishi and M. Emoto and H. Funaba and M. Goto and Y. Hamada and K. Ichiguchi and K. Ida and H. Idei and T. Ido and K. Ikeda and S. Imagawa and A. Isayama and M. Isobe and A. Iwamoto and O. Kaneko and S. Kitagawa and A. Komori and S. Kubo and R. Kumazawa and S. Masuzaki and K. Matsuoka and T. Mito and J. Miyazawa and T. Morisaki and S. Morita and O. Motojima and S. Murakami and T. Mutoh and S. Muto and N. Nakajima and Y. Nakamura and H. Nakanishi and K. Narihara and Y. Narushima and A. Nishimura and K. Nishimura and A. Nishizawa and N. Noda and S. Ohdachi and K. Ohkubo and N. Ohyabu and Y. Oka and M. Osakabe and T. Ozaki and A. Sagara and K. Saito and R. Sakamoto and M. Sasao and K. Sato and T. Seki and T. Shimozuma and M. Shoji and H. Suzuki and S. Sudo and K. Takahata and Y. Takeiri and K. Toi and K. Tsumori and H. Yamada and I. Yamada and K. Yamazaki and N. Yanagi and M. Yokoyama and Y. Yoshimura and Y. Yoshinuma and T. Watari",

year = "2003",

month = jan,

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doi = "10.1103/PhysRevLett.90.205001",

language = "English",

volume = "90",

journal = "Physical Review Letters",

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T1 - Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device

AU - Nagayama, Y.

AU - Kawahata, K.

AU - Shigeru, Inagaki

AU - Peterson, B. J.

AU - Sakakibara, S.

AU - Tanaka, K.

AU - Tokuzawa, T.

AU - Watanabe, K. Y.

AU - Ashikawa, N.

AU - Chikaraishi, H.

AU - Emoto, M.

AU - Funaba, H.

AU - Goto, M.

AU - Hamada, Y.

AU - Ichiguchi, K.

AU - Ida, K.

AU - Idei, H.

AU - Ido, T.

AU - Ikeda, K.

AU - Imagawa, S.

AU - Isayama, A.

AU - Isobe, M.

AU - Iwamoto, A.

AU - Kaneko, O.

AU - Kitagawa, S.

AU - Komori, A.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Masuzaki, S.

AU - Matsuoka, K.

AU - Mito, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Motojima, O.

AU - Murakami, S.

AU - Mutoh, T.

AU - Muto, S.

AU - Nakajima, N.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Narihara, K.

AU - Narushima, Y.

AU - Nishimura, A.

AU - Nishimura, K.

AU - Nishizawa, A.

AU - Noda, N.

AU - Ohdachi, S.

AU - Ohkubo, K.

AU - Ohyabu, N.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Sagara, A.

AU - Saito, K.

AU - Sakamoto, R.

AU - Sasao, M.

AU - Sato, K.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Suzuki, H.

AU - Sudo, S.

AU - Takahata, K.

AU - Takeiri, Y.

AU - Toi, K.

AU - Tsumori, K.

AU - Yamada, H.

AU - Yamada, I.

AU - Yamazaki, K.

AU - Yanagi, N.

AU - Yokoyama, M.

AU - Yoshimura, Y.

AU - Yoshinuma, Y.

AU - Watari, T.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.

AB - Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.

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DO - 10.1103/PhysRevLett.90.205001

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SN - 0031-9007

VL - 90

JO - Physical Review Letters

JF - Physical Review Letters

IS - 20

ER -

Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device

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