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中国科学院近代物理研究所设计的工作频率为325 MHz、最优β为0.52的双柱超导Spoke腔的电磁已经完成。详细地描述了Spoke基部横截面形状和大小对腔体射频性能的影响,采用了跑道形来取代通常的圆形Spoke基部截面。从归一化峰值电磁场和分路阻抗两方面出发,比较了横截面为横向跑道和纵向跑道的Spoke基部。Spoke基部横截面的形状为横向跑道时能得到较好的射频参数,满足中国ADS(C-ADS)的工程需求。最后利用CST粒子工作室对得到的腔体进行了二次电子倍增分析,在工作电压附近不存在二次电子倍增,验证了该腔体形状的可行性。
Institute of Modern Physics, Chinese Academy of Sciences designed a working frequency of 325 MHz, the optimal β 0.52 double column Spoke cavity electromagnetic has been completed. The effect of the shape and size of Spoke’s base cross-section on the RF performance of the cavity is described in detail. The runner shape is used instead of the usual circular Spoke base section. Starting from the normalized peak electromagnetic field and shunt impedance, the Spoke base with transverse cross-section and longitudinal runway is compared. The shape of Spoke’s base cross-section can obtain better RF parameters for horizontal runways and meet the engineering requirements of China ADS (C-ADS). Finally, the cavity obtained by CST particle studio was subjected to secondary electron multiplication analysis. There was no secondary electron multiplication near the working voltage, which verified the feasibility of the cavity shape.