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System size and shear flow effects on ITG turbulence

ITG乱流におけるシステムサイズとシア流の効果

McMillan, B. F.*; Jolliet, S.; Tran, T. M.*; Bottino, A.*; Lapillonne, X.*; Villard, L.*

McMillan, B. F.*; Jolliet, S.; Tran, T. M.*; Bottino, A.*; Lapillonne, X.*; Villard, L.*

In this work, the role of system size (rhostar scaling) and shear flow levels on ion temperature gradient (ITG) turbulence in gyrokinetic simulations is explored using the ORB5 code. Firstly, the scaling of heat flux level versus system size in plasmas with zero initial flow shear is reexamined. Secondly, the effect of poloidal shear flow on ITG turbulence is examined. Even at flow levels many times smaller than the supression threshold, nonlinear turbulence is only seen in the simulation if the initial perturbation is large: the system manifests subcritical turbulence. Inward or outward propagating avalanches and inward and outward shifted diffusivity profiles are seen according to the sign of the flow shear. In cases with strong flow shear almost all the flux is associated with avalanches, which propagate across the entire region with strong pressure gradient.

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