Design Study on Medium beta SC Half-Wave Resonator at IMP

TL;DR

This paper presents the design optimization of a 325 MHz superconducting half-wave resonator with various geometries, focusing on electromagnetic performance, mechanical stability, and frequency stability under helium pressure variations.

Contribution

It introduces a comprehensive design study optimizing geometry and mechanical features to improve performance and stability of a medium beta superconducting half-wave resonator.

Findings

Optimized cavity geometries reduce peak electromagnetic fields.

Studied frequency shifts due to helium pressure fluctuations.

Designed a robust helium vessel for mechanical stability.

Abstract

A superconducting half-wave resonator has been designed with the frequency of 325 MHz and beta of 0.51. Different geometry parameters and shapes of inner conductors (racetrack, ring-shape and elliptical-shape) were optimized to decrease the peak electromagnetic fields to obtain higher accelerating gradients and minimize the dissipated power on the cavity walls. To suppress the operation frequency shift caused by the helium pressure fluctuations and maximize the tuning ranges, the frequency shifts and mechanical properties were studied on the electric and magnetic areas separately. At the end, the helium vessel was also designed to keep the mechanical structure as robust as possible. The fabrication and test of the prototype will be completed in the beginning of 2016.