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(OV/1-6) Recent Advance in LHD Experiment

O. Motojima¹⁾, N. Ohyabu¹⁾, A. Komori¹⁾, O. Kaneko¹⁾, H. Yamada¹⁾, K. Kawahata¹⁾, Y. Nakamura¹⁾, K. Ida¹⁾, T. Akiyama²⁾, N. Ashikawa¹⁾, W.A. Cooper³⁾, A. Ejiri⁴⁾, M. Emoto¹⁾, N. Ezumi⁵⁾, H. Funaba¹⁾, A. Fukuyama⁶⁾, P. Goncharov⁷⁾, M. Goto¹⁾, H. Idei¹⁾, K. Ikeda¹⁾, S. Inagaki¹⁾, M. Isobe¹⁾, S. Kado⁸⁾, H. Kawazome⁶⁾, K. Khlopenkov¹⁾, T. Kobuchi¹⁾, K. Kondo⁶⁾, A. Kostrioukov¹⁾, S. Kubo¹⁾, R. Kumazawa¹⁾, Y. Liang¹⁾, J.F. Lyon⁹⁾, A. Mase¹⁰⁾, S. Masuzaki¹⁾, T. Minami¹⁾, J. Miyazawa¹⁾, T. Morisaki¹⁾, S. Morita¹⁾, S. Murakami¹⁾, S. Muto¹⁾, T. Mutoh¹⁾, K. Nagaoka¹⁾, Y. Nagayama¹⁾, N. Nakajima¹⁾, K. Nakamura¹¹⁾, H. Nakanishi¹⁾, K. Narihara¹⁾, Y. Narushima¹⁾, K. Nishimura¹⁾, N. Nishino¹²⁾, N. Noda¹⁾, T. Notake¹³⁾, H. Nozato⁴⁾, S. Ohdachi¹⁾, Y. Oka¹⁾, H. Okada⁶⁾, S. Okamura¹⁾, M. Osakabe¹⁾, T. Ozaki¹⁾, B.J. Peterson¹⁾, A. Sagara¹⁾, T. Saida⁷⁾, K. Saito¹⁾, S. Sakakibara¹⁾, M. Sakamoto¹¹⁾, R. Sakamoto¹⁾, M. Sasao¹⁾, K. Sato¹⁾, M. Sato¹⁾, T. Seki¹⁾, T. Shimozuma¹⁾, M. Shoji¹⁾, H. Suzuki¹⁾, Y. Takeiri¹⁾, N. Takeuchi¹³⁾, N. Tamura¹⁾, K. Tanaka¹⁾, M.Y. Tanaka¹⁾, Y. Teramachi¹⁴⁾, K. Toi¹⁾, T. Tokuzawa¹⁾, Y. Tomota¹⁵⁾, Y. Torii¹³⁾, K. Tsumori¹⁾, K.Y. Watanabe¹⁾, T. Watari¹⁾, Y. Xu¹⁾, I. Yamada¹⁾, S. Yamamoto¹³⁾, T. Yamamoto¹³⁾, M. Yokoyama¹⁾, S. Yoshimura¹⁾, Y. Yoshimura¹⁾, M. Yoshinuma¹⁾, N. Asakura¹⁶⁾, T. Fujita¹⁶⁾, T. Fukuda¹⁶⁾, T. Hatae¹⁶⁾, S. Higashijima¹⁶⁾, A. Isayama¹⁶⁾, Y. Kamada¹⁶⁾, H. Kubo¹⁶⁾, Y. Kusama¹⁶⁾, Y. Miura¹⁶⁾, T. Nakano¹⁶⁾, H. Ninomiya¹⁶⁾, T. Oikawa¹⁶⁾, N. Oyama¹⁶⁾, Y. Sakamoto¹⁶⁾, K. Shinohara¹⁶⁾, T. Suzuki¹⁶⁾, H. Takenaga¹⁶⁾, K. Ushigusa¹⁶⁾, T. Hino¹⁷⁾, M. Ichimura¹⁸⁾, Y. Takase⁴⁾, F. Sano⁶⁾, H. Zushi¹¹⁾, T. Satow¹⁾, S. Imagawa¹⁾, T. Mito¹⁾, I. Ohtake¹⁾, T. Uda¹⁾, K. Itoh¹⁾, K. Ohkubo¹⁾, S. Sudo¹⁾, K. Yamazaki¹⁾, K. Matsuoka¹⁾, Y. Hamada¹⁾, M. Fujiwara^1)
 
1) National Institute for Fusion Science, Toki, Japan
²⁾ Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Japan
³⁾ CRPP, EPFL), Lausanne, Switzerland
⁴⁾ Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
⁵⁾ Nagano National College of Technology, Nagono, Japan
⁶⁾ Graduate School of Energy Science, Kyoto University, Uji, Japan
⁷⁾ Department of Fusion Science, School of Mathematical and Physical Science, Graduate University for Advanced Studies, Hayama, Japan
⁸⁾ High Temperature Plasma Center, The Univ. of Tokyo, Tokyo, Japan
⁹⁾ Oak Ridge National Laboratory, Tennessee, USA
¹⁰⁾ Advanced Science and Technology Center for Cooperative Research, Kyushu Univ. Japan
¹¹⁾ Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
¹²⁾ Faculty of Engineering, Hiroshima Univ., Hiroshima, Japan
¹³⁾ Department of Energy Engineering and Science, Nagoya University, Nagoya, Japan
¹⁴⁾ The Polytechnic University, Japan
¹⁵⁾ Department of Engineering, Ibaraki Univ. Japan
¹⁶⁾ Naka Fusion Research Institute, JAERI, Japan
¹⁷⁾ Faculty of Engineering, Hokkaido University, Sapporo, Japan
¹⁸⁾ University of Tsukuba, Tsukuba, Japan

Abstract.  Steady progress has been made in the first four years of the LHD experiment. High performance has been realized in the inward shifted configuration ( R_ax = 3.6 m), which has good orbit properties. The energy confinement is found to be 50 % higher than that predicted by the ISS95 Scaling and the enhancement is attributed to formation of a temperature profile with high edge temperature. We have achieved the maximum stored energy of 1.1 MJ. Despite its magnetic hill geometry, an average beta of 3.2 % was achieved without any significant deterioration of the confinement due to MHD plasma activity. Good confinement of helically trapped high energy particles appears to lead to successful ICRF minority heating. When a certain level of ECRH power is added in the core of the low density discharges, improvement of core electron confinement (ITB) and hence high central electron temperature as high as 10 keV are clearly observed. In the core, positive radial electric field is observed, suggesting a critical role of the electric field in the ITB formation. The island ( n/m = 1/1) generated by external error fields is found to shrink significantly due to the plasma effect of low collisionality.

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