【摘要】 本文发展了一种适合于点发射源特点的空间电荷场数值计算方法。该方法以表面电荷法为基础,包括了空间电荷效应的计算,并对点源结构特点进行了简化处理。为了克服表面电荷法计算电位费时的缺点,本文提出一种“表面电荷-差分法”的混合方法。文中以同心球电容器为例,进行了数值解与理论解的比较。分析结果表明,本文所发展的方面在节省计算机内存与机时,以及计算精度方面均优于以往计算点源系统的方法。更多还原

【Abstract】 A new method has been developed which is suitable for calculating the electrical potential of a point emission source including space charge effects. The method is based on the surface charge method, in which the space charge effects have been considered. A simplification against the structure of point source has been made. In order to avoid the time-consuming computation in the surface charge method, a hybrid method, called "Surface Charge-finite difference" method, has been presented as a supplement. The comparison of numerical and analytical solutions concerning a spherical capacitor has been given in the paper. The method has been applied to calculate the emission feature of a liquid metal ion source. It has been shown that the method is superior to the previous methods in saving the computer time and computer memory and in calculation accuracy.更多还原