Simulation of TM_(610) higher-order mode cylindrical cavity
An S-band cylindrical cavity works on TM_(610) higher-order mode was designed on the basis of electromagnetic the-ory.Electromagnetic field distribution,frequency and mode spacing of TM_(610) mode and its adjacent modes were calculated by using HFSS,ISFELD3D,MAFIA and CST-MS.Simulation results indicate that the electromagnetic field of TM_(610) mode distributes in the section around drift tube,and there is no electromagnetic field in the center of the cavity.A ferrite RF absorber was set in the center of the cavity to suppress the non-work modes based on the characteristic of TM_(610) mode.Simulation results of HFSS show that most non-work modes are eliminated by RF absorber except the TM_(510) mode.An absorption cavity coupled to the main cavity was used to suppress the TM_(510) mode.Simulation results show that the absorption-cavity attenuated most energy of TM_(510) mode,and the Q value decreased from 15 604 to 571.