Physics of Heliotron J Confinement

This paper reviews the results of an experimental study undertaken in Heliotron J over the past few years to explore the physics design base for a new concept of a helical-axis heliotron. Measurements of electron cyclotron resonance (ECR)/neutral beam injection (NBI)/ion cyclotron range of frequenci...

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Veröffentlicht in:Plasma and Fusion Research 2010/12/10, Vol.5, pp.S2003-S2003
Hauptverfasser: SANO, Fumimichi, MIZUUCHI, Tohru, NAGASAKI, Kazunobu, HANATANI, Kiyoshi, OKADA, Hiroyuki, NAKAMURA, Yuji, MINAMI, Takashi, KOBAYASHI, Shinji, YAMAMOTO, Satoshi, KONOSHIMA, Shigeru, OHSHIMA, Shinsuke, TAKEUCHI, Masaki, IJIRI, Yoshiyuki, YAGUCHI, Keiji, SENJU, Tohru, SHIBANO, Masashi, TOHSHI, Kiyoshi, SAKAMOTO, Kinzou, MATSUYAMA, Akinobu, MUKAI, Kiyofumi, MINAMI, Keishi, KISHI, Shintarou, LEE, Hyunyong, TAKABATAKE, Yu, YASHIRO, Hiroaki, YAMAMOTO, Kento, NOMURA, Kohta, SUWA, Masashige, YOSHINO, Hayao, MURAKAMI, Sadayoshi, MUTOH, Takashi, TAKEIRI, Yasuhiko, NAGAOKA, Kenichi, OKAMURA, Shoichi, WATANABE, Kiyomasa Y., YOKOYAMA, Masayuki, SUZUKI, Yasuhiro, YOSHIMURA, Yasuo, NISHIMURA, Shin, TAMURA, Naoki, SAKAKIBARA, Satoru, MOTOJIMA, Gen, NISHINO, Nobuhiro, FUKUDA, Takeshi, NAKASHIMA, Yousuke, FENG, Zhen, YANG, Qingwei, FERNÁNDEZ, Angela, CAPPA, Alvaro, TRIBALDOS, Victor, BLACKWELL, Boyd D., CHECHKIN, Viktor V.
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Sprache:eng
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Zusammenfassung:This paper reviews the results of an experimental study undertaken in Heliotron J over the past few years to explore the physics design base for a new concept of a helical-axis heliotron. Measurements of electron cyclotron resonance (ECR)/neutral beam injection (NBI)/ion cyclotron range of frequencies (ICRF) heating plasmas have been made for understanding global energy confinement in connection with the international stellarator scaling law (ISS04), spontaneous confinement improvement (L-H transition), confinement improvement based on supersonic molecular beam injection (SMBI), magnetohydrodynamic (MHD) activity, edge plasma characteristics, including rotation of a filamentary turbulence structure, and plasma current control, including the electron cyclotron current drive (ECCD), the energetic-particle driven Alfvén eigenmodes, and related fast ion dynamics. The results are discussed in terms of the rotational transform ι/2π and the bumpiness εb (or the effective helical ripple εeff). Control of these two parameters was experimentally demonstrated to be the key issue in determining the optimum performance of Heliotron J. The result confirms that the helical-axis heliotron provides a unique and high potential for exploiting an alternative and advanced path to future helical systems.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.5.S2003