SOL-divertor plasma fluid simulations based on the anisotropic ion pressure with a virtual divertor

🖥️ Presenter for the FusionEPtalks #83 is Dr. Satoshi Togo, who earned his PhD at the University of Tokyo in 2016 and then worked as a post-doc researcher at the Plasma Research Center, University of Tsukuba, Japan. Until then, he focused on improving SOL-divertor plasma fluid modeling. In 2018, he was employed as one of the ITER-Monaco fellows, and focused on investigating plasma edge turbulence for 2 years. Since December 2020, he has been working as an assistant professor at the Plasma Research Center, University of Tsukuba, Japan
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Date: May 11th, 2023

Conspectus:
Improving scrape-off layer (SOL)-divertor plasma fluid models is highly required to design DEMO divertors. As an alternative to the conventional Braginskii’s plasma fluid model, we have been developing one based on the anisotropic ion pressure which we call AIP model. The parallel viscous flux term, which is an approximation of the anisotropic component of the ion pressure, is excluded in AIP model by directly describing the fluid equations in terms of the parallel and perpendicular ion pressures. That also makes it possible to exclude an explicit use of the Bohm criterion as the sheath boundary condition. Instead, a virtual divertor (VD) model has been incorporated within AIP model which reproduces effects of a sheath region by setting artificial volumetric sink terms in a virtual region beyond a sheath edge. It is demonstrated that the Bohm criterion can be automatically satisfied including some supersonic flow cases. A direct comparison between the Braginskii’s and AIP model shows that there can be a qualitative deviation of solutions between them in a rare collisional plasmas.

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