200keV直流/脉冲中子发生器束流输运模拟计算

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。

Modulation and Computation of Ion Beam Current Transmission for the 200 keV Continuation/Pulse Neutron Generator

The simulation and computation by computer pay an important role in design of various accelerator. For example, it can quickly confirm the best run parameter and optical condition for a component of the accelerator. Therefore, calculation of complex ion beam current transmission for an accelerator become a simple work. The TRANSPORT program is one of best excellent those for ion beam current transmission modulation program in present world. But, it cannot simulate the linear accelerator beam dynamics and ion optical system of electrostatic accelerator. The LEADS program was introduced from Beijing University. It develop a lot advantages and overcome the some defects compared with TRANSPORT program. To calculate the accelerator dynamics process to contain the buncher(pulse beam current)system is a new characteristic of LEADS program. The process of ion beam transfers for a 200 keV nutron generator is simulated by using a computer program LEADS. The x-plane drawing, y-plane drawing and beam envelopes are gained. The buncher system of nutron generator also is validated by a computer program LMOV. The figure of pulse ion beam is agree with result of experiment.