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(THP2/38) Fast Responses in L/H Transition

T. Iwasaki¹, S. Toda, S.-I. Itoh, M. Yagi, K. Itoh²

Research Institute for Applied Mechanics, Kyushu University 87, Kasuga 816-8580, Japan
¹ Interdisciplinary Graduate School of Engineering Sciences, Kyushu University39, Kasuga 816-8580, Japan
² National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu, 509-5292, Japan

Abstract.  An equation which includes the non-local effect in the heat flux is introduced to study the transient transport phenomena. A non-local heat flux, which is expressed in terms of the integral equation, is superimposed on the conventional form of the heat flux. This model is applied to describe the fast responses in the transition from Low confinement mode (L-mode) to High confinement mode (H-mode). A small fraction of non-local component in the heat flux is found to be very effective in modifying the response against L/H transition. The transient features of the transport property, which are observed in the response of heat pulse propagation, are qualitatively reproduced by the transport simulations based on this model.

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