Radio Frequency Experiments in JFT-2M:Demonstration of Innovative Applications of a Traveling 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. Petty5) and JFT-2M group
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.
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 (0.5~2.2 T).