Purpose Higher-order modes(HOMs)may affect beam stability and refrigeration requirements of superconducting cavity such as the 166.6MHz SC cavity,which is studied at IHEP.Under certain conditions,beam-induced HOMs can...Purpose Higher-order modes(HOMs)may affect beam stability and refrigeration requirements of superconducting cavity such as the 166.6MHz SC cavity,which is studied at IHEP.Under certain conditions,beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the superconducting cavities.Methods In order to limit these effects,we consider the use of the HOM coupler with HOMs extraction on the cutoff tubes of the 166.6MHz SC cavity.Results The HOM coupler can deeply suppress the fundamental mode and efficiently extract dangerous high-order modes.Conclusions In this paper,the HOM coupler design process is presented,which operates at 166.6MHz.The RF and thermal behavior are discussed.In order to verify the designs,a rapid prototype for the favored couplerwas fabricated and characterized on a low-power test stand.展开更多
文摘Purpose Higher-order modes(HOMs)may affect beam stability and refrigeration requirements of superconducting cavity such as the 166.6MHz SC cavity,which is studied at IHEP.Under certain conditions,beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the superconducting cavities.Methods In order to limit these effects,we consider the use of the HOM coupler with HOMs extraction on the cutoff tubes of the 166.6MHz SC cavity.Results The HOM coupler can deeply suppress the fundamental mode and efficiently extract dangerous high-order modes.Conclusions In this paper,the HOM coupler design process is presented,which operates at 166.6MHz.The RF and thermal behavior are discussed.In order to verify the designs,a rapid prototype for the favored couplerwas fabricated and characterized on a low-power test stand.
