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Transport Analysis of High-Beta Plasmas on LHD

Hisamichi Funaba, Kiyomasa Watanabe, Satoru Sakakibara, Ichihiro Yamada, Kenji Tanaka, Tokihiko Tokuzawa, Masaki Osakabe, Yoshiro Narushima, Noriyoshi Nakajima, Masayuki Yokoyama, Hiroshi Yamada, Osamu Kaneko, Kazuo Kawahata, LHD Experimental Group, Sadayoshi Murakami

Fusion Science and Technology / Volume 51 / Number 1 / January 2007 / Pages 129-137

Technical Paper / Stellarators /

Local transport properties of high-beta plasmas in the Large Helical Device are studied by comparing the beta dependence of the experimental results with that of the gyro-reduced Bohm-type transport coefficients. The gradual degradation of global confinement in the high-beta regime seems to be mainly caused by the increment in the local transport at the peripheral region. Effects of the resistive pressure-gradient-driven (g-mode) turbulence on the peripheral transport are also studied. The comparison of the experimental transport coefficients and the calculation results shows that the resistive g-mode can be considered as one of the causes of this degradation.

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