论文部分内容阅读
北京散裂中子源(BSNS)的主加速器——快循环同步加速器(RCS)采用H~-剥离注入方法,将从直线加速器预加速的束流进行累积和进一步加速．束流损失率的控制是该类高功率质子加速器所面临的关键问题之一,而束流损失中很重要的部分是由空间电荷效应造成的．为了减小该类束流损失,注入系统设计中利用H~-剥离注入和相空间涂抹方法将直线加速器预加速的发射度较小的束流尽可能均匀地涂抹到较大的横向相空间中．与其他的类似加速器相比,RCS注入系统将所有注入元件放在一个长为9m的无色散漂移节中以充分节省RCS环的纵向空间,并使对注入系统的操作与对RCS主体的操作完全独立．对于RCS累积的粒子数1．9×10~(13),空间电荷效应对粒子的运动有非常重要的作用,本文介绍了采用ORBIT程序进行三维模拟计算并进行设计优化的结果．还介绍了系统设计时需要考虑的其他重要因素,如质子穿越、电子收集等．
The main accelerators - fast cycle synchrotron (RCS) of Beijing spallation neutron source (BSNS) use H ~ - stripping injection method to accumulate and further accelerate the beam pre-accelerated from linear accelerator. The control of beam loss rate is one of the key problems faced by this kind of high-power proton accelerator, and a very important part of the beam loss is caused by the space charge effect. In order to reduce this type of beam loss, the H ~ - stripping injection and phase space smearing methods are used in the injection system design to spread the beam with lower emittance pre - accelerated by linear accelerator to the larger lateral phase space as much as possible . Compared to other similar accelerators, the RCS injection system places all of the injection elements in a 9m long, dispersive drift section to fully conserve RCS ring longitudinal space and to allow complete operation of the injection system and operation of the RCS body independent. For the RCS accumulation of 1.9 × 10 ~ (13) particles, space charge effect plays a very important role in the motion of particles. This paper introduces the ORBIT program for three-dimensional simulation and design optimization results. Also introduced the system design need to consider other important factors, such as proton traversal, electron collection and so on.