The B2-Eirene （SOLPS 4.0） code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer （SOL） flow, in the experimental advanced superconducting tokamak （EAST） divertor. Simulation res...The B2-Eirene （SOLPS 4.0） code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer （SOL） flow, in the experimental advanced superconducting tokamak （EAST） divertor. Simulation results show that the SOL flow in the divertor region can exhibit complex behaviour, such as a high Mach flow and flow reversal in different plasma regimes. When the divertor plasma is in the detachment state, the high Mach flow with approaching or exceeding sonic speed is observed away from the target plate in our simulation. When the divertor plasma is in the high recycling ~tate, the flow reversM with a ~mall Mach number （IMI 〈 0.2） is observed near the X-point along the separatrix region. The driving mechanisms for the high Mach flow and the reversed flow are analysed theoretically through momentum and continuity equations, respectively. The profile of the ionization sources is shown to be a possible formation condition causing the complex behaviour of the SOL flow. In addition, the effects of the high Mach flow and the flow reversal on the impurity transport are also discussed in this paper.展开更多
基金Project supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No.085FCQ0123)the Chinese National Fusion Project for ITER (Grant No.2009GB106001)
文摘The B2-Eirene （SOLPS 4.0） code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer （SOL） flow, in the experimental advanced superconducting tokamak （EAST） divertor. Simulation results show that the SOL flow in the divertor region can exhibit complex behaviour, such as a high Mach flow and flow reversal in different plasma regimes. When the divertor plasma is in the detachment state, the high Mach flow with approaching or exceeding sonic speed is observed away from the target plate in our simulation. When the divertor plasma is in the high recycling ~tate, the flow reversM with a ~mall Mach number （IMI 〈 0.2） is observed near the X-point along the separatrix region. The driving mechanisms for the high Mach flow and the reversed flow are analysed theoretically through momentum and continuity equations, respectively. The profile of the ionization sources is shown to be a possible formation condition causing the complex behaviour of the SOL flow. In addition, the effects of the high Mach flow and the flow reversal on the impurity transport are also discussed in this paper.
