漂移管直线加速器加速电场分布及稳定性调谐研究  

Design Study on Accelerating Field Distribution and Stability Tuning of Drift Tube Linac

作　　者：刘华昌[1,2] 李阿红 彭军[1,2] 樊梦旭 巩克云[1,2] 瞿培华 李波[1,2] 王云 陈强[1,2] 吴小磊 

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]东莞中子科学中心,广东东莞523803

出　　处：《原子能科学技术》2017年第10期1874-1879,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11105166);中国科学院青年创新促进会项目资助(2015011)

摘　　要：漂移管直线加速器(DTL)加工和安装的误差会导致腔内加速电场分布偏离设计值。为了补偿该偏差,通常在腔内安装调谐装置。同时,在腔内引入耦合杆周期结构,通过调节耦合杆与漂移管之间的间隙,可提高DTL腔内加速电场的稳定性。本文基于高频谐振腔理论和小球拉线测量技术,搭建了一套高精度电场测量系统。结合仿真模拟和实验,实现了中国散裂中子源(CSNS)DTL的加速电场和稳定性调谐,使得腔内实际加速电场分布与设计值相对偏差小于2%,谐振频率和电场稳定性均达到设计指标。The fabrication and assembly errors of the drift tube linac（DTL）may cause a large discrepancy on the distribution of the accelerating field.The tuner was typically used to compensate the deviation.Meanwhile,a series of post-couplers were introduced to increase the stability of the accelerating field by properly adjusting the gap between post-coupler and drift tube.In this paper,based on RF resonant cavity theory and bead pull technology,a high-precision measurement system was established.Combining the simulation with experiment,the low power resonant frequency tuning of CSNS DTL tank was successfully performed.The relative deviation between real field distribution and design result is less than 2%,and the resonant frequency and stability reach the tuning objective.

关 键 词：漂移管直线加速器 高频谐振腔 电场调谐 稳定性 

分 类 号：TL53[核科学技术—核技术及应用]