IPAC'24 - 15th International Particle Accelerator Conference

Preliminary design of a new superconducting harmonic cavity for HALF storage ring

WEPS60

22 May 2024, 16:00

2h

Blues (MCC Exhibit Hall A)

Poster Presentation MC7.T07 Superconducting RF Wednesday Poster Session

Speaker

Zexin Cao (University of Science and Technology of China)

Description

A superconducting (SC) 1.5 GHz (3rd harmonic) cavity is being developed for lengthening bunch and improving beam lifetime in the Hefei Advanced Light Facility (HALF) storage ring. This SC cavity is excited by an electron beam with 350 mA current, 1 nC charge, and ~6.7 ps length. This contribution presents optimizations on such a SC harmonic cavity in detail. Through optimizations it has a low R/Q < 45 Ω, which has potential to achieve a good bunch lengthening. It utilizes a large-radius beam pipe which traps the fundamental (1.5 GHz, TM010) mode, but allows all other cavity monopole and dipole higher-order-modes (HOMs) to travel into a room-temperature RF absorber. All of harmful HOMs are strong-ly damped using a pair of silicon carbide (SiC) rings. In addition, preliminary thermal analysis on the SiC rings is also described in this contribution

Funding Agency

This work is supported by the “Hundred Talents Program” of the Chinese Academy of Sciences, the Fundamental Research Funds for the Central Universities and Hefei Advanced Light Facility Project.