Rhodotron型加速器粒子动力学研究

Dynamics Study of the Rhodotron Accelerator

Rhodotron是一种新型的CW电子加速器,已经广泛应用于辐照加工的很多领域.本文利用Parmela程序研究其动力学特性,深入分析了束团的同步条件、相聚过程以及在CW工作状态下束团相遇碰撞等一系列纵向动力学问题;并详细探讨了空间电荷效应、横向聚焦过程的实现、初始参量对横向束流特性的影响等横向动力学问题.在上述研究基础上,计算出束流损失功率的分布,并比较了模拟计算结果与Rhodotron原型机的实际参数,两者的结果基本一致,由此证明了这种研究方法的可行性.

A new CW electron accelerator with a single compact RF cavity, the Rhodotron, has been applied widely in many fields of industrial irradiation. The paper focuses on dynamics characteristics of the Rhodotron. The longitudinal and transverse dynamics simulations have been performed with the Parmela code. In this paper, synchronous condition of beam acceleration is deduced and the process of longitudinal phase capture is also studied. The problem that bulks overlap each other in the center of the RF cavity under the CW mode is solved by adjusting the parameters of bending magnets. The process that the major traverse focusing is achieved using the bending magnets is analyzed carefully. It is generalized how the space charge effect and the variation of initial parameters impact on transverse beam stability. The distribution of beam losing power is calculated for the radiation protection of this machine. The simulation results agree with the operational parameters of the Rhodotron's prototype, which confirm the research method's feasibility.