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Author(s):
K. Toi, T. Morisaki, S. Sakakibara, S. Ohdachi, T.Minami, S. Morita, H. Yamada, K. Tanaka, K. Ida, S. Okamura, A. Ejiri, H. Iguchi, K. Nishimura, K. Matsuoka, A. Ando, J. Xu, I. Yamada, K. Narihara, R. Akiyama, H. Idei, S. Kubo, T. Ozaki, C. Takahashi, K. Tsumori
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Title:
H-Mode Study in CHS
Date of publication:
Feb.1995
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Key words:
L-H Transition, Edge Transport Barrier, Heliotron/Torsatron, Collapse of Magnetic Island, Radial Electric Field
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Abstract:
In CHS rapid H-mode transition is observed in NBI heated deuterium and hydrogen plasmas without obvious isotope effect, when a net plasma current is ramped up to increase the external rotational transform. The H-mode of CHS has many similarities with those in tokamak. Recent measurement with fast response Langmuir probes has revealed that the rapid change in floating potential occurs at the transition, but the change follows the formation of edge transport barrier. The presence of iota/2pi=l surface near the edge and sawtooth crash triggered by internal modes may play an important role for determining the H-mode transition in CHS.
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