Study of plasma-Wall Interactions in Divertor Simulator

(1)偏滤器等离子体模拟器中等离子体热流到靶板的控制。等离子体分离密度阈值的确定获得分离等离子体的密度阈值的实验和分析结果。对分离等离子体可见连续谱线和一系列He-Balmer谱线的清晰观察表明，分离复合等离子体在0.1-0.3 eV的等离子体温度范围内存在局部热平衡。通过调制放电电流，得到了电子温度随时间变化的局部热平衡关系。对靶的粒子通量与复合速率T_e成正比关系非常敏感。热和二次电子发射对靶的等离子体热流的影响由于平板的热和二次电子发射对鞘电压的抑制和对靶的等离子体热流的增强。(2)等离子体分离的二维流体模拟(3)偏滤器模拟器中离子回旋波的加热

(1) Control of Plasma Heat Flow to Target Plate in Divertor Plasma Simulators.Finding of Density Threshold for Plasma DetachmentExperimental and analytical finding of density threshold to obtain a detached plasma. The reason comes from the electron energy loss channel through the e-i energy exchange.Clear Observation of Recombination Process in Detached PlasmasVisible continuum as well as a series of He Balmer spectral lines shows consistently a partial local thermoequilibrium with the plasma temperature of 0.1-0.3eV for detached recombining plasmas.Demonstration of Recombination-dependent partial Flux to the TargetTemporal change in electron temperature has been obtained by the modulated discharge current. The particle flux to the target was found to be very sensitively dependent of T_e on the recombinations rate proportional to T_e^<-4.5>.Effect of Thermo-and Secondary Electron Emissions to Plasma Heat Flow to the TargetThe suppression of the sheath voltage and the enhancement of the plasma heat flow to the target plate are clearly found due to the thermo-and secondary electron emission form the plate(2) 2D Fluid Simulation on the Plasma Detachment(3) Ion Cyclotron Wave Heating in the Divertor Simulator