CAJ | 학술논문

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。
근거정전자발사단층현상（PET）회선가속기적물리요구여실제정황，학정료 PET 회선고빈쌍강체적구체설계방안。재가속전압비교고적요구하，충분이용유한적공간，설계1/4파장선적이형복면적수강결구강체，채용단로편여이동전용판쌍조해결구，만족료빈솔조해요구；동시획득교고적품질인수，체도료물리설계요구적가속전압。이용 Microwave Studio CST 정서대강체적 Q0치、열분포、공솔손모、미조전용주료상세적분석여계산；대실제측량치여방진계산치진행료대비，병대산생적오차진행료분석화토론。강체전압실제측량치체도50 kV 이상，빈솔은정도체도설계지표1．0×10-6/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 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.