回旋加速器高频腔的设计与分析  

Design and analysis of positron emission tomography cyclotron RF cavity

作　　者：田瑞霞[1] 王贤武[1] 金鹏[1] 许哲 冯勇[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000

出　　处：《强激光与粒子束》2014年第10期283-287,共5页High Power Laser and Particle Beams

基　　金：创新群体重离子加速器物理和技术前言课题(11221064)

摘　　要：根据正电子发射断层显像(PET)回旋加速器的物理要求与实际情况,确定了PET回旋高频双腔体的具体设计方案。在加速电压比较高的要求下,充分利用有限的空间,设计1/4波长线的异型覆面的竖腔结构腔体,采用短路片与移动电容板双调谐结构,满足了频率调谐要求;同时获得较高的品质因数,达到了物理设计要求的加速电压。利用Microwave Studio CST程序对腔体的Q0值、热分布、功率损耗、微调电容做了详细的分析与计算;对实际测量值与仿真计算值进行了对比,并对产生的误差进行了分析和讨论。腔体电压实际测量值达到50kV以上,频率稳定度达到设计指标1.0×10-6/d。According to the physical requirements and the actual situation of Positron Emission Tomography （PET） cyclo trons at Institute of Modern Physics, Chinese Academy of Sciences （IMP, CAS）, a new compact RF cavity with a quarter wave resonator structure and a profiled cover was designed with high accelerated e-field gradient. Additionally, a special dual tuning structure with a short-plate and a movable capacitor plate was designed to meet the requirements of complicated tuning operation mode. The simulated results from Microwave Studio （CST） showed that the design obtained a high quality factor and reached a rated accelerated voltage. The electro-magnetic analysis was carried out, and the power loss tolerance and the thermal distribution were calculated. A prototype cavity was fabricated and measured in January, 2013, and the tested results indicated that the accelerated voltage was higher than 50 kV and the frequency stability was 10^-6/d, both of them reached the original design specification. This proves that the measured results agree well with the simulated ones. All detailed simulations and measurements were analyzed and discussed.

关 键 词：回旋加速器 腔体设计 品质因数 频率稳定度 

分 类 号：TN821.8[电子电信—信息与通信工程]