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Nonlinear growth and motion of magnetic islands in regimes with a high fraction of bootstrap current density

Qingquan Yu, Sibylle Günter1998年Plasma Physics and Controlled FusionIF 2.2出版社

The nonlinear evolution of magnetic islands is investigated in regimes with a high fraction of bootstrap current density, which are of great interest for advanced tokamak scenarios. For a sufficiently large fraction of the equilibrium bootstrap current density (measured against the local magnetic shear and the poloidal magnetic fields), the nonlinear island growth and the saturated magnetic island width are found to depend neither on the original local equilibrium magnetic shear nor on the fraction of the bootstrap current density. In addition, in the positive magnetic shear region the magnetic islands together with its rational surface move inwards. The results of corresponding numerical simulations agree well with analytical predictions.

日本語訳

磁気島の非線形発展は、先進トカマクシナリオにおいて大きな関心を集める、高ブートストラップ電流密度割合の領域において調査される。平衡ブートストラップ電流密度の割合が十分に大きい場合(局所磁気シアおよびポロイダル磁場に対して測定される)、非線形磁気島成長および飽和磁気島幅は、元の局所磁気シアにもブートストラップ電流密度の割合にも依存しないことが見出される。さらに、正の磁気シア領域では、磁気島はその有理面とともに内側へ移動する。対応する数値シミュレーションの結果は、解析的予測とよく一致する。

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