基于电介质的2.5 MeV小型化高束流功率加速管设计  

Design of a 2.5 MeV miniaturization accelerator with high averagebeam power based on dielectric materials

作　　者：范雨轩 杨京鹤 朱志斌[1] 王博 王常强 雷瀚 Fan Yuxuan;Yang Jinghe;Zhu Zhibin;Wang Bo;Wang Changqiang;Lei Han(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院核技术综合研究所,北京102413

出　　处：《强激光与粒子束》2025年第5期164-170,共7页High Power Laser and Particle Beams

基　　金：中国原子能科学研究院青年英才项目(YC222412001504)。

摘　　要：横向尾场导致的束流崩溃效应是限制加速器向强流小型化发展的主要因素。介质金属盘片混合加速结构是具有小型化高束流功率特性的新型加速结构,但其结构较为复杂,导致装配和调谐困难。通过开展介质金属盘片混合加速结构研究,明确介质材料对腔体性能的影响,从而优化结构以解决装配和调谐的问题。该结构优化后可以大幅度降低横向尾场导致的束流崩溃,增大束流功率。基于优化后的结构,设计一只工作频率为S波段2 856 MHz,具有小型化高束流平均功率特性的2.5 MeV加速管。介绍了加速结构的优化及加速管的物理设计,采用数值计算方法完成了加速管束流动力学设计,并用PARMELA进行了验证计算。本研究明确该结构具有成为新一代大束流功率辐照直线加速器的潜力。Industrial linear accelerators are gradually moving towards high average beam power in small,compact shapes.The beam break-up effect due to the transverse wakefield is the main limitation to its performance improvement.The hybrid dielectric-iris-loaded structure is a new miniaturization accelerating structure with high average beam power.The main problem is difficulty in assembly and tuning.Through the study of dielectric based accelerating structures,a miniaturization accelerator with high average beam power was designed and optimized.During the research process,the influence of dielectric structural parameters on the accelerating structure size,accelerating gradient,and beam power was analyzed.The optimized accelerating structure size was reduced by about one-third compared to conventional iris-loaded accelerating structure.It can achieve the same acceleration gradient.The insertion of a simple dielectric tube into the dielectric structure made assembly and tuning easier.The optimized accelerator operats at S-band with the frequency of 2856 MHz and voltage of 2.5 MeV.During the research process,beam dynamics is calculated through numerical calculation methods and PARMELA.Our research provides an important groundwork for further development of irradiation linear accelerators.

关 键 词：加速器 介质金属盘片混合加速结构 尾场 束流崩溃 

分 类 号：TL11[核科学技术—核能科学]