esign and low-power test of an HOM-damped Normal-Conducting Cavity for WALS

Radio frequency (RF) cavities for advanced storage rings, also known as diffraction-limited storage rings, are under development. To this end, a competitive and promising approach involves normal-conducting continuous wave technology. The design and preliminary test of a 499.654MHz RF cavity for the Wuhan Advanced Light Source (WALS) based on specific beam parameters were conducted at the SSRF. Multi-objective evolutionary algorithms have been utilized to optimize RF properties, such as the power loss and power density, resulting in better performance in the continuous wave mode. Further improvements were made to suppress multipacting effects in the working area. To operate stably with the beam, higher-order mode dampers were applied to better address the coupling bunch instability than in previous designs, along with thermal analysis to achieve the desired RF performance. Comprehensive simulation studies demonstrated the stable operation of the RF cavity at the defined beam parameters in the WALS design. A prototype RF cavity was then developed, and the RF performance results in a low-power test showed good agreement with the design and simulation, exhibiting readiness for high-power experiments and operation.