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(EXP4/06) Radio Frequency Experiments in JFT-2M: Demonstration of Innovative Applications of a Travelling Wave Antenna

T. Ogawa¹⁾, K. Hoshino¹⁾, S. Kanazawa²⁾, M. Saigusa²⁾, T. Ido³⁾, H. Kawashima¹⁾, N. Kasuya⁴⁾, Y. Takase⁴⁾, H. Kimura¹⁾, Y. Miura¹⁾, K. Takahashi¹⁾, C. P. Moeller⁵⁾, R. I. Pinsker⁵⁾, C. C. Petty^5)
 
1) Japan Atomic Energy Research Institute, Tokai-mura Ibaraki, 319-1195 Japan.
²⁾ Ibaraki University, Hitachi, Ibaraki, 316-8511 Japan.
³⁾ National Institute for Fusion Science, Toki, Gifu, 509-52 Japan.
⁴⁾ The University of Tokyo, Bunkyou-ku, Tokyo, 113-0033 Japan.
⁵⁾ General Atomics, San Diego, California, 92186-5608 U.S.A.

Abstract.  Abstract. Several innovative applications of a traveling wave (combline) antenna designed for fast wave current drive have been demonstrated for the first time in the JFT-2M tokamak. High energy electrons of at least 10 keV were produced in the plasma core by highly directional fast waves in electron-cyclotron-heated plasmas. The ponderomotive potential of the beat wave, produced by fast waves at two different frequencies, was directly measured for the first time by a heavy ion beam probe. Plasma production was demonstrated using the wave fields excited by the combline antenna over a wide range of toroidal magnetic fields (0.5$\sim$2.2 T).

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