Physics of Heliotron J Confinement

Fumimichi SANO; Tohru MIZUUCHI; Kazunobu NAGASAKI; Kiyoshi HANATANI; Hiroyuki OKADA; Yuji NAKAMURA; Takashi MINAMI; Shinji KOBAYASHI; Satoshi YAMAMOTO; Shigeru KONOSHIMA; Shinsuke OHSHIMA; Masaki TAKEUCHI; Yoshiyuki IJIRI; Keiji YAGUCHI; Tohru SENJU; Masashi SHIBANO; Kiyoshi TOHSHI; Kinzou SAKAMOTO; Akinobu MATSUYAMA; Kiyofumi MUKAI; Keishi MINAMI; Shintarou KISHI; Hyunyong LEE; Yu TAKABATAKE; Hiroaki YASHIRO; Kento YAMAMOTO; Kohta NOMURA; Masashige SUWA; Hayao YOSHINO; Sadayoshi MURAKAMI; Takashi MUTOH; Yasuhiko TAKEIRI; Kenichi NAGAOKA; Shoichi OKAMURA; Kiyomasa Y. WATANABE; Masayuki YOKOYAMA; Yasuhiro SUZUKI; Yasuo YOSHIMURA; Shin NISHIMURA; Naoki TAMURA; Satoru SAKAKIBARA; Gen MOTOJIMA; Nobuhiro NISHINO; Takeshi FUKUDA; Yousuke NAKASHIMA; Zhen FENG; Qingwei YANG; Angela FERNÁNDEZ; Alvaro CAPPA; Victor TRIBALDOS; Boyd D. BLACKWELL; Viktor V. CHECHKIN

doi:10.1585/pfr.5.S2003

Regular Articles

Physics of Heliotron J Confinement

Fumimichi SANO, Tohru MIZUUCHI, Kazunobu NAGASAKI, Kiyoshi HANATANI, Hiroyuki OKADA, Yuji NAKAMURA, Takashi MINAMI, Shinji KOBAYASHI, Satoshi YAMAMOTO, Shigeru KONOSHIMA, Shinsuke OHSHIMA, Masaki TAKEUCHI, Yoshiyuki IJIRI, Keiji YAGUCHI, Tohru SENJU, Masashi SHIBANO, Kiyoshi TOHSHI, Kinzou SAKAMOTO, Akinobu MATSUYAMA, Kiyofumi MUKAI, Keishi MINAMI, Shintarou KISHI, Hyunyong LEE, Yu TAKABATAKE, Hiroaki YASHIRO, Kento YAMAMOTO, Kohta NOMURA, Masashige SUWA, Hayao YOSHINO, Sadayoshi MURAKAMI, Takashi MUTOH, Yasuhiko TAKEIRI, Kenichi NAGAOKA, Shoichi OKAMURA, Kiyomasa Y. WATANABE, Masayuki YOKOYAMA, Yasuhiro SUZUKI, Yasuo YOSHIMURA, Shin NISHIMURA, Naoki TAMURA, Satoru SAKAKIBARA, Gen MOTOJIMA, Nobuhiro NISHINO, Takeshi FUKUDA, Yousuke NAKASHIMA, Zhen FENG, Qingwei YANG, Angela FERNÁNDEZ, Alvaro CAPPA, Victor TRIBALDOS, Boyd D. BLACKWELL, Viktor V. CHECHKIN

Author information

Fumimichi SANO
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Tohru MIZUUCHI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Kazunobu NAGASAKI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Kiyoshi HANATANI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Hiroyuki OKADA
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Yuji NAKAMURA
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Takashi MINAMI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Shinji KOBAYASHI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Satoshi YAMAMOTO
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Shigeru KONOSHIMA
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Shinsuke OHSHIMA
Kyoto University Pioneering Research Unit for Next Generation, Kyoto 611-0011, Japan
Masaki TAKEUCHI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Yoshiyuki IJIRI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Keiji YAGUCHI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Tohru SENJU
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Masashi SHIBANO
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Kiyoshi TOHSHI
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Kinzou SAKAMOTO
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
Akinobu MATSUYAMA
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Kiyofumi MUKAI
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Keishi MINAMI
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Shintarou KISHI
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Hyunyong LEE
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Yu TAKABATAKE
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Hiroaki YASHIRO
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Kento YAMAMOTO
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Kohta NOMURA
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Masashige SUWA
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Hayao YOSHINO
Graduate School of Energy Science, Kyoto University, Kyoto 611-0011 , Japan
Sadayoshi MURAKAMI
Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
Takashi MUTOH
National Institute for Fusion Science, Gifu 509-5292, Japan
Yasuhiko TAKEIRI
National Institute for Fusion Science, Gifu 509-5292, Japan
Kenichi NAGAOKA
National Institute for Fusion Science, Gifu 509-5292, Japan
Shoichi OKAMURA
National Institute for Fusion Science, Gifu 509-5292, Japan
Kiyomasa Y. WATANABE
National Institute for Fusion Science, Gifu 509-5292, Japan
Masayuki YOKOYAMA
National Institute for Fusion Science, Gifu 509-5292, Japan
Yasuhiro SUZUKI
National Institute for Fusion Science, Gifu 509-5292, Japan
Yasuo YOSHIMURA
National Institute for Fusion Science, Gifu 509-5292, Japan
Shin NISHIMURA
National Institute for Fusion Science, Gifu 509-5292, Japan
Naoki TAMURA
National Institute for Fusion Science, Gifu 509-5292, Japan
Satoru SAKAKIBARA
National Institute for Fusion Science, Gifu 509-5292, Japan
Gen MOTOJIMA
National Institute for Fusion Science, Gifu 509-5292, Japan
Nobuhiro NISHINO
Graduate School of Engineering, Hiroshima University, Hiroshima 739-8527, Japan
Takeshi FUKUDA
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Yousuke NAKASHIMA
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
Zhen FENG
Center for Fusion Science, Southwestern Institute of Physics, Sichuan 610041, China
Qingwei YANG
Center for Fusion Science, Southwestern Institute of Physics, Sichuan 610041, China
Angela FERNÁNDEZ
Laboratorio Nacional de Fusion, EURATOM-CIEMAT, 28040 Madrid, Spain
Alvaro CAPPA
Laboratorio Nacional de Fusion, EURATOM-CIEMAT, 28040 Madrid, Spain
Victor TRIBALDOS
Laboratorio Nacional de Fusion, EURATOM-CIEMAT, 28040 Madrid, Spain
Boyd D. BLACKWELL
Australian National University, Canberra, Australia
Viktor V. CHECHKIN
Institute of Plasma Physics, NSC KIP, 61108 Kharkov, Ukraine

Keywords: Heliotron J, helical-axis heliotron, bumpiness, stellarator, confinement improvement, L-H transition, H-mode, ISS04, MHD, ECCD, SMBI, Alfvén eigenmode, advanced helical system

JOURNAL FREE ACCESS

2010 Volume 5 Pages S2003

DOI https://doi.org/10.1585/pfr.5.S2003

Details

Abstract

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 ε_b (or the effective helical ripple ε_eff). 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.

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