Sawtooth oscillation in current-carrying plasma in the large helical device

Y. Nagayama, K. Kawahata, S. Inagaki, 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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

By using the ECE diagnostics, new types of sawtooth crashes in helical plasmas in LHD were discovered. One is the full sawtooth crash in the case of countercurrent, and another is the annular crash in the case of cocurrent. The plasma confinement is slightly degraded due to the sawtooth oscillation. An observed rapid mixture of the plasma in the limited region suggests that sawtooth crashes in LHD are reconnection phenomena.

Original languageEnglish
Pages (from-to)205001/1-205001/4
JournalPhysical Review Letters
Volume90
Issue number20
Publication statusPublished - May 23 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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