电子回旋共振离子源等离子体中离子动力学的三维模拟
Three-dimensional simulations of ion dynamics in the plasma of an Electron Cyclotron Resonance Ion Source
摘要：
在ECRIS中的离子生产建模使用粒子在细胞中的蒙特卡罗碰撞代码在三维几何形状。只跟踪重粒子（离子和原子），电子密度由准中性要求确定，电子温度是一个自由参数。假设等离子体中的电场小到可以忽略不计，并且忽略了由于“电位骤降”而引起的离子约束。结果发现，ECRIS等离子体的实验观察到的功能密切再现的代码，包括提取的离子束的电荷状态分布和源内的溅射图案。在20 Ne +22 Ne同位素混合物中观察到同位素异常，并对这种现象作出了解释。讨论了离子与壁碰撞产生的快原子参数与壁涂层效应之间的可能联系。
英文摘要：
The ion production in an ECRIS is modelled using a particle-in-cell Monte-Carlo collision code in a three-dimensional geometry. Only the heavy particles (ions and atoms) are tracked, with the electron density determined from the requirement of quasi-neutrality, and the electron temperature is a free parameter. The electric fields in the plasma are assumed to be negligibly small, and the ion confinement due to a "potential dip" is neglected. It is found that experimentally observed features of ECRIS plasma are closely reproduced by the code, including the charge-state-distributions of extracted ion beams and sputtering patterns inside the source. The isotope anomaly is observed for the mixture of 20Ne + 22Ne isotopes, and some explanation for the effect is given. Possible connection between the wall-coating effect and parameters of the fast atoms created in collisions of the ions with the walls is discussed.
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