Development of Fundamental Power Coupler for C-ADS Superconducting Elliptical cavities

TL;DR

This paper presents the design and analysis of a high-power fundamental power coupler for 5-cell elliptical cavities in China's Accelerator Driven sub-critical System, focusing on RF performance, thermal management, and multipacting suppression.

Contribution

It introduces a novel coaxial coupler design optimized for high power RF delivery, thermal efficiency, and clean room assembly for superconducting cavities.

Findings

Successful RF design and external Q calculation.

Effective thermal analysis ensuring low heat load.

Multipacting simulations indicating reliable operation.

Abstract

5-cell elliptical cavities are chosen for the main linac of China Accelerator Driven sub-critical System in the medium energy section. Each cavity is driven by one fundamental power coupler delivering RF power up to 150 kW. A single window, coaxial type coupler satisfying high power requirements, class 10 clean room assembly with cavity and low heat load simultaneously was designed. This paper gives the details of RF design, external Q calculation and thermal analysis as well as multipacting simulations of the coupler.