双圆筒加速透镜中强流束传输的模拟

Simulation of Intense Beam Transfer in Double-Cylinder Accelerate Lens

用矩阵法分析非强流束流与强流束流在双圆筒加速透镜中的传输,编写束流在双圆筒加速透镜等元件中传输的计算程序DCALENS.采用优化方法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,用DCALENS程序进行模拟计算,并对模拟结果进行比较分析.结果表明:束流流强越大,束流包络曲线横向发散越显著,空间电荷力越强;束流流强大于2 A时,束流包络曲线发散明显.

To study intense beam transfer in double-cylinder accelerate lens,a matrix method is applied to transport matrixs in double-cylinder accelerate lens of non-intense and intense beams.A computer code DCALENS was written for pulsed beams transporting in double-cylinder accelerate lens.Optimization techniques are used for given optical conditions.Iteration procedures are adopted to obtain self-consistent solutions in DCALENS.Calculations made by DCALENS and other codes are compared and analyzed.It shows that the greater the beam current,the more apparent beam envelope lateral divergence,as well as the space-charge effect.As beam current is greater than 2A,beam envelope lateral divergence is obvious.