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Author(s):
K. Nishimura, R. Kumazawa, T. Mutoh, T. Watari, T. Seki, A. Ando, S. Masuda, F. Shinpo, S. Murakami, S. Okamura, H. Yamada, K. Matsuoka, S. Morita, T. Ozaki, K. Ida, H. Iguchi, I. Yamada, A. Ejiri, H. Idei, S. Muto, K. Tanaka, J. Xu, R. Akiyama, H. Arimoto, M. Isobe, M. Iwase, O. Kaneko, S. Kubo, T. Kawamoto, A. Lazaros, T. Morisaki, S. Sakakibara, Y. Takita, C. Takahashi and K. Tsumori
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Title:
ICRF Heating in CHS
Date of publication:
Sep. 1994
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Key words:
ICRF heating, minority heating, helical system, boronization
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Abstract:
ICRF heating experiments with five poloidal half-turn antennas have been carried out in Compact Helical System (CHS). These antennas designed for the inward shifted magnetic configuration (R_ax=92.1cm) were installed in the high field side of helical field. A high power RF pulse is applied to a deuterium plasma with hydrogen minority initiated by ECH or NBI. The plasma performance was mainly affected by the oxygen radiation which was reduced by more than 2 times by boronization. The plasma stored energy reached 2.2 kJ with 590 kW of RF power from 5 antennas and was sustained to the end of the RF pulse(60msec). Two-component ion energy spectrum was observed by NPA. The combined heating with NBI was also successful and achieved the increase in the stored energy of 0.8 kJ with 450 kW of RF power from 5 antennas.
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