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回旋加速器高频腔的设计与分析
Design and analysis of positron emission tomography cyclotron RF cavity
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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50 kV 以上，频率稳定度达到设计指标1．0×10-6/d。Abstract: 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 accel-erated voltage was higher than 50 kV and the frequency stability was 10 -6/d,both of them reached the original design specifica-tion.This proves that the measured results agree well with the simulated ones.All detailed simulations and measurements were analyzed and discussed.
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