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(EXP2/15) Comparative Studies of a Spherical Tokamak and a Conventional Tokamak: Magnetic Turbulence-Induced Transport

   
H. Toyama , K. Hanada ¹, H. Totsuka ², E. Ishiyama , S. Shiraiwa , S. Duorah , I. Nakajima ³, M. Ushigome , N. Uetake , K. Tanji , N. Kasuya , Y. Nagashima , K. Yamagishi , A. Ejiri , Y. Takase 
 
Department of Physics, Graduate School of Science, University of Tokyo, Tokyo, Japan
¹ Advanced Fusion Research Center, Research Institute for Applied Mechanics, Kyusyu University, Japan
² Hitachi, Ltd., Tokyo, Japan
³ Fujitsu, Ltd., Tokyo, Japan

Abstract
The paper reports experiments on turbulence -induced transport in plasmas with aspect ratios A of 1.4 $\sim$ 2.5 in a single machine. There is little aspect ratio dependence in electrostatic fluctuations. The relative levels of magnetic fluctuations in the core region are 0.01% and 0.05% for A = 1.4 and 2.5, respectively. The electron heat transport estimated from the magnetic fluctuation level of 0.01% is 0.2 $\rm kW/m^2$, which is less than 2% of the electron heat flux of 13 $\rm kW/m^2$ estimated from the global power balance. Thus in spherical tokamak s, the present results show that magnetic fluctuations are not responsible for electron heat transport, as in conventional tokamaks.

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