三次谐波谐振腔模态分析
Third Harmonic Cavity Modal Analysis
摘要：
FNAL设计并制造了三次谐波腔，用于DESY的FLASH/XFEL设施，以最大限度地减少沿聚束的能量传播。这些腔中的模式进行了分析和频率误差的敏感性进行了评估。电路模型被用来模拟微带。增强的双稳态电路模型，包括连续的细胞耦合，除了通常的最近邻耦合。模式匹配代码是用来促进快速模拟，将制造误差。用一系列突变点逼近曲线曲面，并检验了这种方法的有效性
英文摘要：
Third harmonic cavities have been designed and fabricated by FNAL to be used at the FLASH/XFEL facility at DESY to minimise the energy spread along the bunches. Modes in these cavities are analysed and the sensitivity to frequency errors are assessed. A circuit model is employed to model the monopole bands. The monopole circuit model is enhanced to include successive cell coupling, in addition to the usual nearest neighbour coupling. A mode matching code is used to facilitate rapid simulations, incorporating fabrication errors. Curves surfaces are approximated by a series of abrupt transitions and the validity of this approach is examined
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