杂质离子对等离子体边界参量的影响

采用一维流体模型研究了含有杂质离子的等离子体与器壁材料相互作用给边界等离子体参量带来的影响.通过数值模拟，研究了分别选用碳和钨作为器壁材料时，器壁温度不同情形下热发射产生的电子对等离子体器壁电势、电场强度、热发射电子流以及沉积器壁离子动能流的影响.研究结果发现，当面向等离子体材料表面温度升高时，器壁电势和热发射产生的电流将增加，器壁电场强度和离子沉积器壁动能流则会减小，并且钨作为器壁材料要比碳作为器壁材料对于等离子体边界参量影响更明显.此外，研究了钨作为器壁材料时，碳杂质离子（浓度和电荷数）对等离子体器壁参量的影响.

Effects of Impurity Ions on Plasma Boundary Parameters

A one-dimensional fluid model is used to investigate the effect of the interaction between the plasma containing impurity ions and the wall material on the boundary plasma parameters. The effects of electrons produced by thermal emission at different wall temperatures on the plasma wall potential, electric field, thermal emission electron flux and ion kinetic energy fluxes to the wall are studied by numerical simulation. It is found that when the surface temperature of plasma facing materials increases, the wall potential and heat emission flux will increase, the wall electric field and the kinetic energy fluxes to the wall will decrease. The influence of tungsten as the wall material on the plasma boundary parameters is more obvious than that of carbon as the wall material. In addition, the effect of carbon impurity ions (concentration and charge number) on the plasma wall parameters is studied when tungsten is used as the wall material.