325 MHz低β半波长谐振腔设计

摘要

对质子加速器中半波长谐振腔(HWR)型的设计进行了研究,完成一种新型HWR超导腔的初步设计.通过对超导腔设计方法及设计原则的研究,结合相关半波长谐振腔的研究现状,充分利用电磁设计软件的功能,对325 MHz低β大孔径的半波长谐振腔进行了设计研究.在建模中,针对腔体的不同部位进行比较分析,优化模型形状；在计算中,采用新型有限元网格,使计算快速而结果稳定；在后处理中,使用参数扫描,实现了腔形参数优化；在腔形分析中,计算了二次电子倍增效应,验证了腔体形状的可行性.通过此设计过程,使所设计的新型β为0.12的HWR腔具有较好的电磁参数,满足质子加速器的要求,并可应用到实际工程中.%A 325 MHz low beta half wave resonator (HWR) for proton accelerator was designed.The study on the principle of designing a superconducting cavity was described.The modeling on a new HWR was performed on different parts,then the electromagnetic analysis of the HWR was implemented.In the process of cavity design,parametric modeling was used to construct the cavity shape,then curved tetrahedral mesh cells were used to fulfill the EM calculation,and parameters sweeping was used to optimize the RF parameters of HWR superconducting cavity.The HWR cavity shape was also analyzed by means of multipacting calculation using TRACK3P code.Satisfied RF parameters were achieved on the new designed 325 MHz low beta HWR cavity.The new HWR cavity will be fabricated after more analysis and it may be applied to the linac for proton accelerator in the future.