TESLA式高阶模衰减器的改进与设计研究

Improvement Study of TESLA Style HOM Coupler

为了消除超导加速腔中高阶模场对加速粒子的影响,在DESY的高阶模耦合器结构的基础上本文提出了改进的耦合器．用HFSS程序针对1．5cell腔设计优化了高阶模耦合器,得到高阶模耦合器对几种主要模式的吸收．研究结果表明,采用新型结构后,衰减器对主要有害模的衰减由-40dB提高到 -15dB,使原有高阶模衰减器的性能明显提高．该高阶模衰减器也适用于国产2cell超导腔的使用．

To eliminate the higher order modes （HOMs） in superconducting cavity, an improvement study on HOM coupler has been done. With Code HFSS, the HOM coupler for 1＋1/2 Cell superconducting cavity of the Peking University has been designed and optimized. The improved HOM coupler can absorb main HOMs out to -15dB from -40dB, which proves this HOM coupler to be effective.