改善閉じ込めと新古典効果

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Matrix Inversion(MI)method is developed in order to estimate the neoclassical ion thermal diffusivity, x_<NC>, correctly. In the MI method, effects of impurity on x_<NC> are treated self-consistently and no approximation on the friction and the viscosity matrix elements is carried out. The comparison of x_<NC> value between the MI method and the Chang-Hinton's(CH)formula shows that the CH formula overestimates x_<NC> Value twice as large as that of MI method for typical JT-60U plasmas. The different dependence of x_<NC> on the inverse aspect ratio, ε, the effective charge number. Z_<eff>, and the normalized ion collisionality, ν_<*i>, between the MI method and the CH formula is presented. The radial electric field, E_r, is estimated from the momentum and the heat momentum balance equations parallel to the magnetic field. Profiles of E_r are compared between the two types of improved core confinement plasmas with internal transport barrier(ITB)in JT-60U, the "parabolic type ITB" and the "box type ITB". In the box type ITB, the experimentally estimated thermal diffusivity, x^<exp>, decreases in the core region. However, the E_r shear is not so strong. In the box type ITB, a strong E_r shear appears inside the ITB layer and the x^<exp> value decreases drastically to the level of X_<NC>. The E×B shearing rate becomes almost the same as the linear growth rate of the drift microinstability inside the ITB layer of the box type ITB.
社団法人プラズマ・核融合学会の論文
1999-04-25

改善閉じ込めと新古典効果

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