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(FT2/3) Anisotropic Radiation Damage by Charge Exchange Neutrals under the High Ion Temperature Discharges in TRIAM-1M

T. Hirai¹, T. Fujiwara, K. Tokunaga, N. Yoshida, S. Itoh and the TRIAM Group

Research Institute for Applied Mechanics, Kyushu University, Japan
¹ Interdisciplinary Graduate School of Engineering and Sciences, Kyushu University, Japan

Abstract.  Plasma irradiation experiments have been carried out in TRIAM-1M. Thin foil specimens were exposed to a high ion temperature plasma (hydrogen plasma, limiter configuration) and the microstructural evolution was examined by means of transmission electron microscopy. The anisotropic radiation damage due to charge exchange (CX) hydrogen neutrals was clearly shown. This anisotropy could be explained as the effect of gradient B drift. By the comparison with the areal density obtained from hydrogen beam irradiation experiments, the angular dependence of the CX neutrals fluence was estimated quantitatively. The localized formation of energetic CX neutrals at the lower half of the plasma indicates stronger sputtering and radiation damage at the bottom of the torus.

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