High Q₀ R&D Applicable to CEBAF Cavities

The Continuous Electron Beam Accelerator Facility (CEBAF) is the first accelerator of its kind to utilize large-scale superconducting radiofrequency (SRF) cavities. Ongoing research and development efforts have led to significant improvements in both accelerating gradient and quality factor. In this presentation, we present an update on C100 and C75-style single cell and multicell cavities, currently being used in CEBAF accelerator to explore the possibilities of reducing heat load by improving the quality factor. Low-temperature nitrogen infusion and medium-temperature baking have been applied to several cavities, achieving quality factor of higher than 2x10¹⁰ at 2.07 K at operating gradient of 20 MV/m.