Evolution of edge turbulent transport induced by L-mode detachment in the HL-2A tokamak

Abstract

Abstract This paper presents the characteristics of L-mode detachment, together with the behavior of edge turbulent transport and plasma confinement on the HL-2A tokamak. Partially detached and pronounced detached states have been achieved in L-mode plasma. Stored energy was maintained before and after detachment. Edge turbulence and its transport have increased obviously in the partially detached state. In the pronounced detached state, redistribution of the density and temperature profiles due to detachment leads to low amplitude of electron temperature and pressure, as well as very weak edge turbulence and transport. Despite strong plasma radiation in the pronounced detached state, reduced edge turbulent transport contributes to maintaining stored energy in detached L-mode plasma in HL-2A. Different detachment states play an important role in the redistribution of density and temperature profiles, which requires further study.