S波段束流相位探测腔与偏心式波导耦合预聚束器的设计  

Design of a beam phase cavity and a waveguide coupled eccentric circle structure prebuncher in S-band

作　　者：贺祥[1] 侯汨[1] 赵风利[1] 裴士伦[1] 

机构地区：[1]中国科学院高能物理研究所,粒子加速物理与技术重点实验室,北京100049

出　　处：《强激光与粒子束》2015年第7期250-253,共4页High Power Laser and Particle Beams

基　　金：中国科学院高能物理研究所研发基金项目(K755YF19ZZ)

摘　　要：设计了工作于S波段的波导耦合型预聚束器和束流相位探测腔.为了增加功率容量,预聚束器采用波导耦合机制代替了传统的同轴耦合环耦合,而偏心圆结构的设计能够补偿因耦合窗口的引入导致的径向电场不对称,进一步改善了强流束流品质.预聚束器设计指标与测试结果：耦合系数1.73,空载品质因数2195,腔体谐振频率的可调范围为2854.55～2856.9MHz.为实现测量束流相对射频脉冲的时间,进行强流输入功率补偿,选择了能够在线进行束流相位实时测量的束流相位探测腔,采用旋转对称结构,并通过两个同轴耦合环提取束流通过时激发的感应信号,作为直线相控系统的参考信号.束流相位探测腔设计与测试结果：空载品质因数2392,3dB带宽为2.05MHz,腔体谐振频率的可调范围为2805.45～2809.45MHz.所有器件的仿真设计与测试结果基本一致.A new waveguide coupled prebuncher and a new beam phase cavity working at S band are designed. For increas ing the power capacity, the waveguide coupling mechanism is used instead of the traditional coaxial ring coupling for the pre buncher. An eccentric circle structure of the cavity is adopted to solve the problem of an asymmetric electrical field along the ra dial direction caused by the introduction of the waveguide coupling window, which improves the beam quality on high beam cur rent. The measurement results of a coupling coefficient of 1.73 range from 2 854.55 MHz to 2 856.9 MHz are got in the final and RF pulse in order to compensate the input power with the equipment for the real time measurement of beam phase. The , an unloaded quality factor of 2195 as well as a variable frequency prototype of prebuncher. For measuring the timing between beam high beam current, a beam phase cavity is chosen to be the on line beam phase cavity has a rotational symmetrical structure, and two coaxial coupling rings are used to extract the inducted signal from the beam, which will be used as the reference signal of the phase controlling system. The prototype of beam phase cavity has a measurement result of an unloaded quality factor of 2392, a 3 dB bandwidth of 2.05 MHz as well as a variable frequency range from 2 805.45 MHz to 2 809.45 MHz. The measurement results match well with the simulation results.

关 键 词：预聚束器 偏心圆结构 波导耦合 束流相位探测腔 S波段 

分 类 号：TL53[核科学技术—核技术及应用] TL503.2