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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。
In order to meet the demand of Spoke021 for superconducting spoke chamber in C-ADS project, Spoke021 was optimized in detail. Parametric model of Spoke021 is scanned by parameter, the possible extreme value of the key electromagnetic characteristic of the cavity is searched, and the physical meaning of the change of each parameter in the optimization process is explained and explained in detail. When the parameters of Spoke021 reach the final optimization value, the two key ratios that characterize the cavity performance are: E_p / E acc = 3.14, Bp / E aCC = 4.77 mT / (MV / m). Considering that secondary multiplication (MP) has an important influence on the performance index that Spoke021 can reach, MP of the cavity is modeled and analyzed. The results show that MP does not occur when Spoke021 works at E acc = 10 MV / m, and the optimized parameters can meet the needs of Spoke021 engineering design. Finally, the TTF curve of the cavity is calculated, which shows that the cavity has better performance Wide speed acceptance.