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计算机模拟计算在各种类型加速器的设计中起着很重要的作用。例如,计算机模拟很快就可以确定加速器各部件的最佳工作参数和所需要的光学条件,使一台加速器复杂的束流输运系统设计变成简单的工作。TRANSPORT程序是当今世界上关于束流输运计算的最优秀程序之一。但是,该程序不能进行静电加速器离子光学系统的计算,也不能作直线加速器的粒子动力学计算。为此从北京大学引进了LEADS程序,它不仅具有TRANSPORT程序的优点,还克服了其不足。对含有聚束(脉冲束流)系统的加速器粒子动力学进行模拟是LEADS程序的新特色。实验中用LEADS程序模拟了200keV直流/脉冲中子发生器束流输运过程,得到了横向相图、纵向相图和束包络图。还用LMOV程序计算和验证了聚束系统,束流脉冲波形图和实验结果比较接近。
Computer simulation plays a very important role in the design of various types of accelerators. For example, computer simulations quickly determine the optimum operating parameters and required optical conditions for each part of the accelerator, making the design of a complex beam-transport system of an accelerator a simple task. The TRANSPORT program is one of the best programs in the world for beam transport calculations. However, the program can not calculate the electrostatic accelerator ion optical system, nor can it be used as a linear accelerator particle dynamics calculation. To this end, LEADS program was introduced from Peking University, which not only has the advantages of TRANSPORT program, but also overcomes its shortcomings. Simulation of accelerator particle dynamics with a beam-streamer system is a new feature of the LEADS program. In the experiment, the LEADS program was used to simulate the beam transport of a 200 keV DC / pulsed neutron generator. The transverse phase diagram, longitudinal phase diagram and beam envelope diagram were obtained. The LMOV program is also used to calculate and verify the bunching system. The pulse waveform of the beam is very close to the experimental results.