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Author(s):
K. Toi, T. Morisaki, S. Sakakibara, A. Ejiri, H. Yamada, S. Morita, K. Tanaka, N. Nakajima, S. Okamura, H. Iguchi, K. Ida, K. Tsumori, S. Ohdachi, K. Nishimura, K. Matsuoka, J. Xu, I. Yamada, T. Minami, K. Narihara, R. Akiyama, A. Ando, H. Arimoto, A. Fujisawa, M. Fujiwara, H. Idei, O. Kaneko, K. Kawahata, A. Komori, S. Kubo, R. Kumazawa,
T. Ozaki, A. Sagara, C. Takahashi, Y. Takita and T. Watari
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Title:
Impact of Rotational-Transform Profile Control on Plasma Confinement and Stability in CHS
Date of publication:
Aug. 1994
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Key words:
L-H Transition, Heliotron/Torsatron, Transport Barrier, Threshold Power, Rotational Transform, Density Fluctuations
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Abstract:
In neutral beam heated plasma of CHS, which is a low aspect-ratio heliotron/torsatron device, the effect of rotational transform (chi) profile shape on plasma confinement and stability is studied by inducing a net plasma current (Ip). In the case that the external chi is increased by Ip, very rapid H-mode transition (within ~0.2 ms) is observed at the thresholds of Ip and heating power, having all characteristics found in the tokamak H-mode. There is no obvious difference in the H-mode characteristics between deuterium and hydrogen plasmas. In the opposite case that the external chi is decreased by reversing Ip, the H-mode transition is not observed.
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