Extension and characteristics of an ECRH plasma in LHD

S. Kubo, T. Shimozuma, Y. Yoshimura, T. Notake, H. Idei, S. Inagaki, M. Yokoyama, K. Ohkubo, R. Kumazawa, Y. Nakamura, K. Saito, T. Seki, T. Mutoh, T. Watari, K. Narihara, I. Yamada, K. Ida, Y. Takeiri, H. Funaba, N. OhyabuK. Kawahata, O. Kaneko, H. Yamada, K. Itoh, N. Ashikawa, M. Emoto, M. Goto, Y. Hamada, T. Ido, K. Ikeda, M. Isobe, K. Khlopenkov, T. Kobuchi, S. Masuzaki, T. Minami, J. Miyazawa, T. Morisaki, S. Morita, S. Murakami, S. Muto, K. Nagaoka, Y. Nagayama, H. Nakanishi, Y. Narushima, K. Nishimura, M. Nishiura, N. Noda, S. Ohdachi, Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson, A. Sagara, S. Sakakibara, R. Sakamoto, M. Shoji, S. Sudo, N. Takeuchi, N. Tamura, K. Tanaka, K. Toi, T. Tokuzawa, K. Tsumori, K. Watanabe, T. Watanabe, K. Yamazaki, M. Yoshinuma, A. Komori, O. Motojima

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    29 Citations (Scopus)

    Abstract

    One of the main objectives of LHD is to extend the plasma confinement database for helical systems and to demonstrate such extended plasma confinement properties to be sustained in the steady state. Among the various plasma parameter regimes, the study of confinement properties in the collisionless regime is of particular importance. Electron cyclotron resonance heating (ECRH) has been extensively used for these confinement studies of LHD plasma from the initial operation. The system optimizations including the modification of the transmission and antenna system are performed with special emphasis on the local heating properties. As a result, a central electron temperature of more than 10 keV with an electron density of 0.6 × 1019 m-3 is achieved near the magnetic axis. The electron temperature profile is characterized by a steep gradient similar to those of an internal transport barrier observed in tokamaks and stellarators. The 168 GHz ECRH system demonstrated efficient heating at densities more than 1.0 × 10 20 m-3. The continuous wave ECRH system is successfully operated to sustain a 756 s discharge.

    Original languageEnglish
    Article number008
    Pages (from-to)A81-A90
    JournalPlasma Physics and Controlled Fusion
    Volume47
    Issue number5 A
    DOIs
    Publication statusPublished - May 1 2005

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Condensed Matter Physics

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