Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier

T. Shimozuma, S. Kubo, H. Idei, S. Inagaki, N. Tamura, T. Tokuzawa, T. Morisaki, K. Y. Watanabe, K. Ida, I. Yamada, K. Narihara, S. Muto, M. Yokoyama, Y. Yoshimura, T. Notake, K. Ohkubo, T. Seki, K. Saito, R. Kumazawa, T. MutohT. Watari, A. Komori

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    Two types of improved core confinement were observed during centrally focused electron cyclotron heating (ECH) into plasmas sustained by counter (CNTR) and Co neutral beam injections (NBI) in the Large Helical Device. The CNTR NBI plasma displayed transition phenomena to the high-electron-temperature state and had a clear electron internal transport barrier, while the Co NBI plasma did not show a clear transition or an ECH power threshold but showed broad high temperature profiles with moderate temperature gradient. This indicated that the Co NBI plasma with additional ECH also had an improved core confinement. The electron heat transport characteristics of these plasmas were directly investigated using heat pulse propagation excited by modulated ECH. These effects appear to be related to the m/n = 2/1 rational surface or the island induced by NBI beam-driven current.

    Original languageEnglish
    Pages (from-to)1396-1403
    Number of pages8
    JournalNuclear Fusion
    Volume45
    Issue number11
    DOIs
    Publication statusPublished - Oct 25 2005

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Condensed Matter Physics

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