一种计算金属二次电子发射系数的解析模型

发布时间：2018-08-22 20:30

【摘要】：精确的金属材料二次电子发射系数模型对于计算空间大功率微波部件的微放电功率阈值至关重要,而现有的二次电子发射系数模型在准确性和工程应用两方面不能兼顾。通过分析二次电子的逸出几率,结合修正的Bethe能量损失规律,建立了金属材料二次电子发射系数的解析模型。进一步以未清洗的和Ar离子清洗过的Ag材料为例,用解析模型对试验测量值进行了拟合,在获得解析模型中关键参数的基础上建立了Ag材料二次电子发射系数模型。计算结果显示,在不同入射角度下未清洗和清洗Ag材料的模型计算值与试验值的均方差在4%以内,表明提出的解析模型在减少拟合参数的基础上能够获得具体金属材料精确的二次电子发射系数模型,可用于精确模拟空间大功率微波部件的微放电功率阈值和加速器内部的电子云浓度。
[Abstract]:The accurate model of secondary electron emission coefficient for metal materials is very important to calculate the threshold of micro discharge power of high power microwave components in space, but the existing models of secondary electron emission coefficient can not be considered in both accuracy and engineering application. Based on the analysis of the probability of secondary electron emission and the modified Bethe energy loss rule, an analytical model of secondary electron emission coefficient for metallic materials is established. Taking the uncleaned and ar ion cleaned Ag materials as an example, the experimental data were fitted with analytical model, and the secondary electron emission coefficient model of Ag material was established on the basis of obtaining the key parameters of the analytical model. The results show that the mean square deviation between the calculated values and the experimental values of the uncleaned and cleaned Ag materials at different incident angles is less than 4%. It is shown that the proposed analytical model can obtain a precise secondary electron emission coefficient model for specific metal materials on the basis of reducing fitting parameters. It can be used to accurately simulate the microdischarge power threshold and the electron cloud concentration inside the accelerator.
【作者单位】：中国空间技术研究院西安分院空间微波技术重点实验室;西安交通大学电子与信息工程学院;
【基金】：国家自然科学基金(U1537211,11675278,51675421) 中国博士后科学基金(2015M572661XB) 陕西省博士后科研项目
【分类号】：O462.2

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