低アスペクト比トカマクの平衡解析と近似モデルについての検討

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タイトル別名
  • Studies on Equilibrium Analysis and Cylindrical Model of Low Aspect Ratio Tokamak
  • テイ アスペクトヒ トカマク ノ ヘイコウ カイセキ ト キンジ モデル ニ

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The low-aspect-ratio tokamak is expected to realize a compact and economical fusion reactor. This paper presents a equilibrium study of low-aspect-ratio tokamaks for the basis of both of Magnetohydrodynamic (MHD) analysis and cylindrical approximation model. Since its external toroidal field coil does not have enough surrounding space for the installation of neutron shielding material, it should be made of a normal conductor, whose current density and the resistive power loss should be estimated. On the basis of the cylindrical approximation model, the relationships are derived between the resistive power loss and various plasma parameters as aspect ratio, elongation, safety factor at the edge, and total beta value. The resistive power loss can be decreased by decreasing aspect ratio, however, neutron wall loading and the total beta increase. It is found that they can be in the reasonable quantitative range by the appropriate selections of the plasma parameters. The evaluation is made of the applicability of the model by comparing the results with those of the numerical MHD analysis.

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