A compact TM_(020)-mode RF cavity was proposed and studied by KEK and RIKEN for the storage ring of the NanoTerasu facility.However,performance limitations due to accelerating mode leakage into the coaxial slots have ...A compact TM_(020)-mode RF cavity was proposed and studied by KEK and RIKEN for the storage ring of the NanoTerasu facility.However,performance limitations due to accelerating mode leakage into the coaxial slots have been identified.This paper presents an improved TM_(020)-mode cavity design to solve this issue.By employing an elliptical choke,the leakage power can be significantly reduced.Harmful parasitic modes other than the TM_(020)-mode are effectively suppressed using the elliptical choke placed at the magnetic node of the TM_(020)-mode.Through optimization,this improved TM_(020)-mode RF cavity meets the requirements of the Super Tau-Charm Facility(STCF)collider rings with a beam current of up to 2 A.Detailed mechanical design and thermal analysis confirm the feasibility and stability of the improved cavity.展开更多
基金supported by the“Hundred Talents Program”of the Chinese Academy of Sciences(No.KJ2310007003)the Fundamental Research Funds for the Central Universities(Nos.WK2310000114,KY2310000047,and KY2310000067)+1 种基金the Chinese Academy of Sciences President’s International Fellowship Initiative(No.2025PD0102)Super Tau-Charm Facility key technology research project。
文摘A compact TM_(020)-mode RF cavity was proposed and studied by KEK and RIKEN for the storage ring of the NanoTerasu facility.However,performance limitations due to accelerating mode leakage into the coaxial slots have been identified.This paper presents an improved TM_(020)-mode cavity design to solve this issue.By employing an elliptical choke,the leakage power can be significantly reduced.Harmful parasitic modes other than the TM_(020)-mode are effectively suppressed using the elliptical choke placed at the magnetic node of the TM_(020)-mode.Through optimization,this improved TM_(020)-mode RF cavity meets the requirements of the Super Tau-Charm Facility(STCF)collider rings with a beam current of up to 2 A.Detailed mechanical design and thermal analysis confirm the feasibility and stability of the improved cavity.
