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Generation of E  ×  B flow shear by finite orbit width effects from heat sources in tokamaks

S.S. Kim, S. Ku, Hogun Jhang2022年被引用 1Nuclear FusionIF 3出版社

We present a possible mechanism for the generation of strong E × B flow shear relevant to internal transport barrier formation in tokamak plasmas. From gyrokinetic calculations, we show that strong E × B flow shear can be generated by finite orbit width (FOW) effects associated with a non-uniform heat source and is sufficient to lead to transport barrier formation in the core region with a moderate power level. Two FOW effects inducing neoclassical polarization are shown to be responsible for this: (1) the radial drift of particle orbit center due to the variation of the heat source within orbit width and (2) the non-uniformly evolved orbit width by the non-uniform heating.

日本語訳

我々は、トカマクプラズマにおける輸送障壁形成に関連する強いE×Bフローシアの生成メカニズムの可能性を提示する。ジャイロ運動論的計算から、非一様な熱源に伴う有限軌道幅(FOW)効果によって強いE×Bフローシアが生成され得ることを示し、これは中程度のパワーレベルでコア領域における輸送障壁形成をもたらすのに十分である。新古典分極を誘起する2つのFOW効果がこの原因であることを示す:(1) 軌道幅内の熱源の変動による粒子軌道中心の径方向ドリフト、および(2) 非一様加熱による軌道幅の非一様な時間発展。

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