Design of a 325MHz Half Wave Resonator prototype at IHEP

TL;DR

This paper presents the design, simulation, optimization, fabrication, and testing of a 325MHz superconducting half wave resonator prototype for high beam proton accelerators, demonstrating promising electromagnetic performance.

Contribution

It introduces a detailed design and fabrication process for a 325MHz HWR prototype, including electromagnetic analysis, multipacting simulation, and mechanical optimization, with successful vertical test results.

Findings

Achieved Eacc=7MV/m with Q0=1.4×10^9 at 4.2K

Reached Eacc=15.9MV/m with Q0=4.3×10^8 in vertical test

Demonstrated feasibility of the HWR design for CW proton accelerators

Abstract

A 325MHz beta=0.14 superconducting half wave resonator(HWR) prototype has been developed at the Institute of High Energy Physics(IHEP), which can be applied in continuous wave (CW) high beam proton accelerators. In this paper, the electromagnetic (EM) design, multipacting simulation, mechanical optimization, and fabrication are introduced in details. In vertical test at 4.2K, the cavity reached Eacc=7MV/m with Q0=1.4*10^9 and Eacc=15.9MV/m with Q0=4.3*10^8.