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Author(s):
M. Okamoto, A.A. Maluckov, S. Satake, N. Nakajima and H. Sugama
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Title:
Transport and Radial Electric Field in Torus Plasmas
Date of publication:
Dec. 2002
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Key words:
neoclassical transport, effect of finite orbit width, radial electric field, FORTEC, potato particle, Lagrangian formulation, heat diffusivity, diffusion process, irregular magnetic field, statistical point of view, non-local transport.
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Abstract:
Transport phenomena in torus plasmas are discussed focusing on the genaration of the neoclassical radial electric field. A sophisticated delta f Monte Carlo particle simulation code "FORTEC" is developed including the effect of finite orbit width (FOW), which is the non-local property of the plasma transport. It will be shown that the neoclassical radial electric field in the axisymmetric tokamak is generated due to this FOW effect. The Lagrangian approach is applied to construct a non-local transport theory in the region of near-axis. The reduction of the heat diffusivity toward the axis will be shown. From a statistical point of view, diffusion processes are studied in the presence of irregular magnetic fields. It is shown that the diffusion processes are non-local in almost all the cases if there are some irregularities in the magnetic field.
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