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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
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)
