等离子体中氖输运及辐射特性模拟

Modeling of the transportation and radiation characteristic of neon in plasma

通过假定一定的温度和密度分布,数值求解了一维等离子体连续性方程,获得了杂质氖电离态分布及辐射功率随空间位置和时间的变化.计算结果显示,在杂质注入时间较短时,由于离子输运及各种损失机制,总杂质密度在空间分布尚未达到平衡,电离态离子主要分布在等离子体周边,完全电离离子所占份额很小.当时间达到0.2s时,氖在等离子体中完全达到平衡状态,体积辐射功率趋于一个稳定的数值.达到平衡状态后,芯部一个很大范围内氖杂质主要以Ne+10离子型态存在,辐射功率以轫致辐射为主,因此辐射功率较小.辐射功率在空间的分布随时间变化较小,主要分布在等离子体周边及边界层一个狭小的辐射带内,说明氖引起的辐射主要由低电离态离子引起.

We have solved the 1-dimentional time-dependent continuity equation of neon in plasma numerically using a finite differential method under the assumed distribution of electron density and temperature.The ionization state distribution and radiation power as function of coordinate changes with time are obtained.Results show that the ionized ions are deposited mainly at plasma periphery and edge region when the gas puffing time is short enough.At time of 0.2 s,the impurity reaches a ionization/recombination and transport equilibrium state.The radiated power is distributed in a very narrow zonal region inside the plasma boundary all the time,and the gas puffing time has little effect of this kind of distribution.