Numerical Simulation Study of the Magnetic Flux Tube Expansion on the Divertor Plasma Parameters by the LINDA Code

In this research, we investigate the effect of magnetic flux tube expansion on the divertor plasma parameters by using the fluid code LINDA. A comparison between the cylindrical flux tube (without the magnetic flux expansion) and the expansion magnetic flux tube has been undertaken. The aim of the study is to understand the impact of magnetic field expansion on the divertor physics by using the LINDA fluid code. The plasma density (n(i)) is decreased and parallel velocity is increased (u(i parallel to)) toward the target plate with the expansion of magnetic field lines near the target plate. The heat and particle fluxes are reduced significantly on the target plate in the case of the expansion mesh configuration. For the case of cylindrical mesh, advection becomes stronger with the decreasing distance from the target plate. In the case of expansion mesh, diffusion is stronger with the decreasing distance from the target plate. These outcomes clearly indicate the effect of the magnetic field structure on the divertor plasma parameters. (C) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research

Automated summary

The effect of magnetic flux tube expansion on divertor plasma parameters was investigated using the LINDA fluid code. The study showed that plasma density decreases and parallel velocity increases near the target plate with magnetic field expansion. Heat and particle fluxes are significantly reduced on the target plate with expansion mesh configuration, while advection becomes stronger with decreasing distance from the target plate in the case of cylindrical mesh.