强流束在二极磁场中传输的模拟计算

Simulation calculation of intense beam transporting in dipole magnet field

为了研究空间电荷力对束流在二极磁场中传输的影响,从理论上用矩阵法分析非强流脉冲束流与强流脉冲束流在二极磁场中的传输矩阵,编写了束流在二极磁场等元件中传输的计算程序。用Powell优化方法计算非强流束传输实现给定的光学条件,用迭代方法计算强流束传输获得自洽解。在不同束流流强条件下,运用该程序与其他程序进行了模拟计算,并对模拟结果进行了比较分析。模拟结果表明:束流流强越大,束流包络曲线横向发散越显著,空间电荷效应越强。

To study space-charge forces' influence on beam transport in dipole magnet field,the matrix method was applied to analyze the transport matrices in dipole magnet field of non-intense pulsed beam and intense pulsed beam theoretically,and a computer code was programmed for the pulsed beam transporting in dipole magnet field.Powell optimization techniques were used to calculate non-intense pulsed beam for attaining the given optical conditions and iteration procedures were adopted to compute intense pulsed beam for obtaining self-consistent solutions in this computer code.The calculations were made by using the code and other codes under the condition of different beam current,and the simulation results were compared and analyzed.The results show that greater beam current causes more apparent beam envelope lateral divergence and more powerful space-charge effect.