Role of e × B on in-out divertor asymmetry in high recycling/partial detachment regimes under L-mode and H-mode conditions

摘要

The role of the E × B electric drift on background plasma and carbon impurity in-out divertor asymmetry was estimated under L-mode and H-mode conditions in the high recycling regime and partial detachment regime by using the edge plasma code SOLPS5.1. It was found that the poloidal electric drift E _r × B also may play a dominant role during H-mode discharge in high recycling regime, instead of the radial electric drift E _θ × B. Moreover, it also was found that during H-mode with partial detachment both components can play simultaneously a crucial role in inducing the in-out asymmetry. Their synergistic effect can make the asymmetry much more obvious than that with either of them separately. However, E _θ × B in partial detachment during L-mode can play a main role in inducing in-out asymmetry, rather than E _r × B. Besides, the role of E × B components on carbon (C) impurity in-out asymmetry was also addressed. Simulation results reveal that E _r × B or E _θ × B individually have a very small effect on C impurity ions in-out asymmetry, especially E _θ × B, while their synergistic effect makes the impurity ions exhibit a much more remarkable in-out asymmetry. Moreover, it was found that the E _r × B and E _θ × B drift flows in the private flux region could play a crucial role in inducing C impurity in-out asymmetry, rather than the parallel flow or electric drift flow in the upstream SOL region when only considering E × B.