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(EXP1/16) Compact Toroid Injection Experiment in JFT-2M

T. Ogawa, N. Fukumoto¹, M. Nagata¹, H. Ogawa, M. Maeno, K. Hasegawa, T. Shibata, T. Uyama¹, J. Miyazawa², S. Kasai, H. Kawashima, Y. Miura, S. Sengoku, H. Imura and the JFT-2M Team

Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, 319-1195 Japan,
¹ Himeji Institute of Technology, Himeji, Hyogo, 671-22 Japan,
² National Institute for Fusion Science, Toki, Gifu, 509-52 Japan.

Abstract.  Compact toroid (CT)injection experiments with H-mode plasmas were carried out for the first time in JFT-2M. The soft x-ray emission profile shows central penetration of CT in H-mode plasma heated by 1.2 MW NBI as well as in OH plasmas, with toroidal magnetic field of 0.8 T. The line-averaged electron density rapidly increased by $\Delta$$\overline{\mathrm{n_e}}$ $\propto$ 0.2×10¹⁹m^{- 3} at a rate of 4×10²¹m^{- 3}/s in H-mode and the fuelling efficiency was roughly 20%.The asymmetrical radial profile in the soft x-ray emission was produced for $\propto$ 50$\mu$s by the central penetration of CT.

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