强流束在三膜片静电场中的传输模拟

Transport Simulation of Intense Beam in Three-Diaphragm Electrostatic Field

由于强流束有较强的空间电荷效应,强流束的传输一直是备受关注的问题.基于三膜片静电场的传输矩阵、最速下降法和高斯-赛德尔迭代法等理论,应用Visual Fortran编写了强流束在三膜片静电场中传输的计算程序TDEF,TDEF适用于强流束在三膜片静电场中传输的模拟计算.用TDEF和其他程序对不同流强的束流在三膜片静电场中的传输进行模拟计算,并对计算结果进行了比较分析.计算结果显示:随着束流流强的增大,空间电荷效应增强,包络曲线横向发散程度增大.

Due to strong space-charge effect of intense beam, intense beam transport has been highly concerned for years. Based on theory of transport matrix in three-diaphragm electrostatic field, steepest descent algorithm and Gauss-Seidel iterative method, a computer simulation code TDEF was developed with Visual Fortran to calculate intense beam transport in three-diaphragm electrostatic field. TDEF and other codes were used to simulate different current beam transport in three-diaphragm electrostatic field, and the simulation results were compared and analyzed. The calculation results indicate that space-charge effect increases with the rise of beam current, and beam envelope lateral diverges that space-charge effect induces increases.