200MHz质子带窗四翼型射频四极场加速器结构模拟研究

Simulation for 200 MHz proton 4-vane RF quadrupole accelerator with window

根据束流动力学设计方案,使用电磁场计算软件CST Microwave Studio对带窗四翼型射频四极场(RFQ)结构进行了模拟研究,分析了加速腔结构参数对其物理特性的影响,得到了200MHz质子带窗四翼型RFQ优化结构方案。该结构的比分路阻抗为79.5kΩ·m,模式间隔达25.802MHz。与传统的四翼型RFQ比较结果表明:带窗四翼型RFQ具有较低的工作频率范围、良好的电稳定性以及较高的比分路阻抗。

According to the beam dynamics design,the influence of structure parameters on physical parameters was investigated after modeling the 4-vane RF quadrupole（RFQ）with window and three-dimensional electrodynamics simulations by CST Microwave Studio.We obtained the preliminary structural scheme of the 200MHz proton 4-vane RFQ with window,the specific shunt impedance of the structure was 79.5kΩ·m,frequency separation of two modes was 25.802MHz.Comparative research of the 4-vane RFQ with window and the traditional 4-vane RFQ shows that the 4-vane RFQ with window provides low operating frequency range,fine electrical stability and relatively high specific shunt impedance.