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Author(s):
T.Seki, R.Kumazawa, Y.Takase, A.Fukuyama, T.Watari, A.Ando, Y.Oka, O.Kaneko, K.Adati, R.Akiyama, R.Ando, T.Aoki, Y.Hamada, S.Hidekuma, S.Hirokura, K.Ida, K.Itoh, S.-I.Itoh, E.Kako, A. Karita, K.Kawahata, T.Kawamoto, Y.Kawasumi, S.Kitagawa, Y.Kitoh, M.Kojima, T.Kuroda, K.Masai, S.Morita, K.Narihara, Y.Ogawa, K.Ohkubo, S.Okajima, T.Ozaki, M.Sakamoto, M.Sasao, K.Sato, K.N.Sato, F.Shinbo, H.Takahashi, S.Tanahashi, Y.Taniguchi, K.Toi and T.Tsuzuki
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Title:
Application of Intermediate Frequency Range Fast Wave to JIPP T-IIU Plasma
Date of publication:
Sep. 1990
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Key words:
fast wave current drive, electron heating, 3rd ion harmonic heating, 130 MHz rf system, antenna phasing, JIPP T-IIU tokamak
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Abstract:
A series of experiments using a newly constructed 130 MHz RF system has been conducted on the JIPP T-IIU tokamak since 1989. It is predicted theoretically that the fast wave in this range of frequency weakly interacts with particles . Though weak, two mechanisms of wave absorption were identified in the experiment : electron Landau/transit-time damping and 3rd ion cyclotron harmonic heating. The former has an intimate connection with fast wave current drive and the latter can provide a new regime of plasma heating or a possible method of controling transport of alpha-particles . It was found that the efficiency of the 3rd cyclotron heating is improved by using it in the combination with NBI and ICRF heating . The heating efficiency obtained is as high as that of conventional heating. The experimental results are also analyzed on the basis of a theory of the global wave which takes into account wave particle interactions . These mechanism of wave particle interactions are competing with each other as they will be under more realistic reactor conditions.
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