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(EXP2/17) Confinement Studies during LHCD and LHW Ion Heating on HL-1M

Y. Liu, X. D. Li, E. Y. Wang, J. Rao, Y. Yuan, H. Xia, W. M. Xuan, S. W. Xue, X. T. Ding, G. C. Guo, S. K. Yang, J. L. Luo, G. Y. Liu, J. E. Zeng, L. F. Xie, M.W. Wang Z. H. Kang, Z. C. Deng, M. L. Shi, J. Q. Zhang, W. Y. Hong, L. W. Yan, P. F. Zhao, X. W. Deng

Southwestern Institute of Physics, P.O. Box 432, Chengdu, Sichuan, 610041, China

Abstract.  Confinement Studies during LHCD and LHW Ion Heating on HL-1M LHCD experiments were conducted on HL-1M in the past years. The LHW system is composed of a 2×12 multijunction launcher and two klystrons of 500kW. The confinement improvement by LHCD was confirmed on HL-1M. The investigations on the relationship between the confinement and the edge plasma phenomena were carried out. The confinement improvement seems to be related with the production of radial electron field during LHCD. Recently several distinctive phenomena related with plasma confinement were observed during LHCD. These phenomena include an ELM-like perturbation in boundary plasma and a sudden collapse of soft-X ray radiation from central plasma. Usually ELM mode was obtained in divertor configuratin, while on HL-1M the ELM mode was trigged by LHCD in limiter configuration. Moreover, at high density, distinct ion heating by LHW was observed. Analyses shows that the parameter decay instability seems to play a role in the mechanism of the ion heating.

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IAEA 2001