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Author(s):
S. Okamura, K. Matsuoka, R. Akiyama, D.S. Darrow, A. Ejiri, A. Fujisawa, M. Fujiwara, M. Goto, K. Ida H. Idei, H. Iguchi, N. Inoue, M. Isobe, K. Itoh, S. Kado, K. Khlopenkov, T. Kondo, S. Kubo, A. Lazaros, S. Lee, G. Matsunaga, T. Minami, S. Morita, S. Murakami, N. Nakajima, N. Nikai, S. Nishimura, I. Nomura, S. Ohdachi, K. Ohkuni, M. Osakabe, R. Pavlichenko, B. Peterson, R. Sakamoto, H. Sanuki, M. Sasao, A. Shimizu, Y. Shirai, S. Sudo, S. Takagi, C. Takahashi, S. Takayama, M. Takechi, K. Tanaka, K. Toi, K. Yamazaki, Y. Yoshimura and T. Watari
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Title:
Confinement Physics Study in a Small Low-Aspect-Ratio Helical Device CHS
Date of publication:
Oct. 1998
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Key words:
IAEA, fusion energy conference, Yokohama
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Abstract:
The configuration parameter of the plasma position relative to the center of helical coil winding is very effective one to control the MHD stability and the trapped particle confinement in Heliotron/Torsatron systems. But these two characteristics are contradictory in this parameter to each other. Inward shifted configuration is favorable for the drift-orbit-optimization but it is predicted unstable with the Mercier criterion. Various physics problems, such as an electric field structure, plasma rotation, MHD phenomena, have been studied in CHS with a compromising intermediate position. With this standard configuration, CHS has supplied experimental results for understanding general toroidal confinement physics and low-aspect-ratio helical systems. In the recent experiments, it was found that the wide range of inward shifted configurations gives stable plasma discharges without any restriction to the special pressure profile. Such enhanced range of operation made it possible to study experimentally the drift-orbit-optimized configuration in the Heliotron/Torsatron systems. The effect of configuration improvement was studied with plasmas in a low collisionality regime.
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