Sustaining of Dipole Component of Axial Current in a Tokamak

概要

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It is shown that the radial distribution of plasma pressure is closely related to that of main symmetric component of axial current. When the former profile is expressed by p=p_0(1-Ψ/Ψ_a)^γ (A) and that of the latter by j_s=j_<s0>(1-Ψ/Ψ_a)^α (B) the condition of sustaining of the dipole component of axial current in a tokamak is written by γ-1=a (C) where Ψ and Ψ_a are the flux function and its value at the column surface. The relation (C) is obtained as follows. The most important component to modify the symmetric profile (B) is the dipole component, which can be divided into the two sub-components. The first is due to the toroidal curvature effect and the second due to the plasma pressure. The first does not suffer the resistive decay, since the plasma resistivity η is inversely proportional to j_s and so ηj_s is nearly constant. As for the second sub-component, it also does not suffer the resistive decay in the similar way to the first, when (1-Ψ/Ψ_a)^<-a>(1-Ψ/Ψ_a)^<γ-1> is kept constant and this condition gives the interesting relations (C).
社団法人プラズマ・核融合学会の論文
1995-05-25