表面微孔阵列结构调控二次电子发射特性研究

固体介质的二次电子发射受到材料成分、元素构成、表面状况等因素影响，其中表面状况对于二次电子发射系数起着至关重要的作用，表面微结构调控入射电子在材料表面的运动状态和碰撞频率，进而影响二次电子发射。基于粒子路径追踪算法，建立了一次电子与材料表面碰撞模型，研究了微孔阵列结构参数对二次电子发射系数的调控机制，分析了微孔阵列单元深度、孔径和面积占比的影响规律。研究发现，通过设置合理的结构单元深度和宽度，可以实现对二次电子发射系数的调节。单元孔径宽度为2mm、深度为5mm、数目为169时，二次电子发射系数降低了57%。研究结论可为脉冲功率、航天领域的沿面放电机理分析和抑制提供理论和数据支撑。

Study on secondary electron emission characteristics regulated by surface microporous array structure

The secondary electron emission of solid insulator is affected by material composition, element composition, surface condition and other factors. The surface condition plays a vital role in secondary electron yield. Surface microstructure regulates the motion state of incident electrons on the material surface and then affect the secondary electron emission. Based on the path tracking algorithm, this paper establishes the primary electron-surface collision model, studies the regulation mechanism of the structural parameters of the microporous array on the secondary electron emission coefficient, and analyzes the effects of the unit depth, width and area ratio of the microporous array.It is found that the secondary electron yield can be adjusted by setting the reasonable depth and width of the structural unit. When the unit width is 2mm, the depth is 5mm and the number is 169, the secondary electron yield is reduced by 57%.The conclusions of this paper can provide theoretical and data support for the analysis and suppression of surface discharge mechanism in the field of pulse power and aerospace.