耦合腔链等效电路模型计算加速管场分布

Calculating Field Distribution of a Linear Accelerator Using Equivalent Circuit Model

介绍利用耦合腔链等效电路模型计算加速管场分布的原理和方法．把加速腔链等效为谐振电路, 通过求解回路方程组,并引入分流阻抗等物理参数,可计算加速腔链整管的电磁场幅值和相位分布．这一计算方法对加速管动力学设计和加速管几何参数设计有很好的指导意义,并在16MeV返波加速管设计调试过程中得到了应用和验证．

Equivalent circuit model is used to calculate field distribution of a coupled cavity chain. An RF cavity can be represented as a resonant LC circuit and the coupler as an idealized transformer. By solving the equations of the circuit model and simulating each cavity shape, the field distribution of the entire cavity chain is calculated. This method is very useful in particle dynamics simulation and accelerator geometry design. Calculation result and experimental measurement of a 16MeV BTW（backward traveling wave） linac is presented.