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Helical electric potential modulation via zonal-flow coupling to resonant magnetic perturbations

M. Leconte, J.-H. Kim2017年被引用 1Nuclear FusionIF 3出版社

Helical modulations of the electric potential were observed in several devices during application of resonant magnetic perturbations (RMPs). To address the implication of the helical modulation on RMP-induced transport, we derive a system of 1D equations for zonal flows (ZFs) and helical potential in the presence of RMPs. As ZFs are turbulence-driven, turbulence plays a major role in this plasma self-organization towards a quasi-equilibrium with 3D helical potential. The model reveals how RMPs modify an initially given a saturated-state of coexisting turbulence and ZFs. It is shown that RMPs trigger a transport bifurcation by allowing energy-transfer out of turbulence-driven ZFs into ZF-driven helical potential.

日本語訳

ヘリカル変調された電位が、共鳴磁場摂動(RMP)の印加中に複数の装置で観測された。RMP誘起輸送に対するヘリカル変調の影響を考察するため、RMP存在下での帯状流(ZF)とヘリカル電位に関する1次元方程式系を導出する。ZFは乱流駆動型であるため、乱流は、3次元ヘリカル電位を伴う準平衡状態へのプラズマ自己組織化において主要な役割を果たす。このモデルは、RMPが、共存する乱流とZFの初期飽和状態をどのように変調するかを明らかにする。RMPが、乱流駆動型ZFからZF駆動型ヘリカル電位へのエネルギー移動を可能にすることにより、輸送分岐を誘発することが示される。

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Magnetic perturbationResonant magnetic perturbationZonal flow
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