| Autor: |
Hiroshi Yamada, Naoki Tamura, Masaki Osakabe, Byron J. Peterson, R. O. Pavlichenko, K. V. Khlopenkov, Hisamichi Funaba, Yasuo Yoshimura, Tokihiko Tokuzawa, Takashi Mutoh, Kazuo Toi, Takashi Satow, Yasuhiko Takeiri, T. Kobuchi, Suguru Masuzaki, S. Tanahashi, A.T. Notake, S. Yamamoto, J. Miyazawa, Keisuke Matsuoka, Kunizo Ohkubo, K. Nishimura, Dirk Hartmann, Kazumichi Narihara, Yasuji Hamada, Shigeru Inagaki, Tetsuo Seki, N. Ashikawa, Sadatsugu Muto, Osamu Motojima, Katsuyoshi Tsumori, Sadao Satoh, Takashi Minami, Hiroshi Idei, Nobuyoshi Ohyabu, Mamoru Shoji, Kenji Tanaka, Tomo-Hiko Watanabe, Yan Ping Zhao, Y. Liang, Katsumi Ida, M. Sasao, Satoshi Ohdachi, Takashi Shimozuma, K. Yamazaki, A. V. Krasilnikov, Kimitaka Itoh, Yuki Torii, Hideya Nakanishi, Atsushi Fukuyama, Yoshihide Oka, Hiroyuki Okada, Kenji Saito, Masahiko Emoto, Yoshio Nagayama, N. Inoue, Shin Kubo, N. Noda, Shinichiro Kado, Motoshi Goto, T. Ozaki, Soichiro Yamaguchi, Akio Sagara, S. Murakami, Tomohiro Morisaki, H. Sasao, Ryuhei Kumazawa, Akio Komori, Masayuki Yokoyama, Satoru Sakakibara, M. Fujiwara, M. Sato, Katsunori Ikeda, Osamu Kaneko, Y. Nakamura, Kuninori Sato, Kazuo Kawahata, K.Y. Watanabe, Ryuichi Sakamoto, S. Morita, Masao Okamoto, Shigeru Sudo, Mitsutaka Isobe, Ichihiro Yamada, T. Watari, P.C. De Vries, Hajime Suzuki, M. Takechi |
| Rok vydání: |
2001 |
| Předmět: |
|
| Zdroj: |
Nuclear Fusion. 41:325-332 |
| ISSN: |
0029-5515 |
| DOI: |
10.1088/0029-5515/41/3/310 |
| Popis: |
An ion cyclotron range of frequency (ICRF) heating experiment was conducted in the third campaign of LHD in 1999. 1.35 MW of ICRF power were injected into the plasma and 200 kJ of stored energy were obtained, which was maintained for 5 s by ICRF power only after the termination of ECH. The impurity problem was so completely overcome that the pulse length was easily extended to 68 s at a power level of 0.7 MW. The utility of a liquid stub tuner in steady state plasma heating was demonstrated in this discharge. The energy confinement time of the ICRF heated plasma has the same dependences on plasma parameters as those of the ISS95 stellarator scaling with a multiplication factor of 1.5, which is a high efficiency comparable to that of NBI. Such an improvement in performance was obtained by various means, including: (a) scanning of the magnetic field intensity and minority concentration, (b) improvement of particle orbits due to a shift of magnetic axis and (c) reduction of the number of impurity ions by means of titanium gettering and the use of carbon divertor plates. In the optimized heating regime, ion heating turned out to be the dominant heating mechanism, unlike in CHS and W7-AS. Owing to the high quality of the heating and the parameter range being extended far beyond that of previous experiments, the experiment can be regarded as the first complete demonstration of ICRF heating in stellarators. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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