摘要：功率耦合器是粒子加速腔射频功率馈送的关键部件。耦合器在安装至加速腔之前,必须进行常温高功率测试和锻炼,以检验加工工艺和设计指标,提高其射频性能。详细介绍了中国科学院近代物理研究所ADS25 Me V加速器样机162.5 MHz耦合器测试平台的改进设计。针对原有接触式测试锻炼方式的不足,提出非接触式测试锻炼方案。对耦合器测试锻炼过程进行了物理抽象,采用理论模拟的方法分析测试腔体功率传输。基于分析结果设计了低损耗、宽通带、多用途的非接触式耦合器测试腔体。该腔体可实现20 k W测试功率下60 W左右的腔体损耗和15 MHz-3 d B带宽。

摘要：为满足C-ADS项目建设对超导轮辐腔Spoke021的需求,对Spoke021进行了详细的电磁参数优化。对Spoke021的参数化模型进行参数扫描,针对腔体的关键电磁特征量寻找可能存在的极值,详细分析、解释了优化过程中各个参数发生变化的物理意义。在Spoke021各参数达到最终优化值时,表征腔体性能的两个关键比值分别为:E_p/E_(acc)=3.14,Bp/E_(aCC)=4.77 mT/(MV/m)。考虑到次级电子倍增(Multipacting,MP)对Spoke021运行中所能达到的性能指标有很重要影响,对腔体的MP进行了建模分析。结果表明,当Spoke021工作在E_(acc)=10 MV/m情况下,没有发生MP,优化得到的参数可以满足Spoke021工程设计的需要;最后计算了腔体的TTF曲线,表明该腔体具有较宽的速度接受度。

摘要：A superconducting squeezed type half-wave resonator （HWR） of β=0.09 has been developed at the Institute of Modern Physics, Lanzhou. In this paper, a basic design is presented for the stiffening structure for the detuning effect caused by helium pressure and Lorentz force. The mechanical modal analysis has been investigated the with finite element method （FEM）. Based on these considerations, a new stiffening structure is proposed for the HWR cavity. The computation results concerning the frequency shift show that the low beta HWR cavity with new stiffening structure has low frequency sensitivity coefficient df/dp and Lorentz force detuning coefficient KL, and stable mechanical properties.