Speaker
Description
Nb3Sn SRF cavities have attracted increasing attention as a candidate for next-generation accelerators due to their potential to achieve high Q-values even at 4.2 K, enabling operation with conduction cooling. Since 2019, KEK has been developing Nb3Sn single-cell cavities via the vapor diffusion method using Sn and SnCl2 sources. In parallel, a dedicated small-scale coating system was constructed to promote systematic investigations using planar samples. This contribution presents recent progress in both single-cell cavity coatings and sample-based investigations. Notably, our best-performing cavity achieved an accelerating gradient of 17.5 MV/m with a Q-value of 1.2×10¹⁰ at 5 MV/m and 4.2 K. Through systematic trials, we are beginning to clarify how coating parameters—such as source amount and heating duration—under our furnace environment relate to cavity performance. In addition, sample studies have provided intriguing insights into how variations in coating conditions affect the resulting film quality. These insights are being used to refine the coating protocol in the large cavity furnace.
Funding Agency
This work was supported by 【MEXT Development of key element technologies to improve the performance of future accelerators Program】 Japan Grant Number JPMXP1423812204.
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