Speaker
Description
Nb$_3$Sn is one of the most promising materials for next-generation superconducting radio-frequency (SRF) cavities, as it enables high-Q operation at 4 K. This feature opens the possibility of conduction-cooled SRF systems without liquid helium. At KEK, Nb$_3$Sn coating development based on the Sn vapor diffusion method has been in progress since 2019, with continuous improvements in cavity performance. Last year, the coating furnace was dismantled, relocated, and recommissioned. After the relocation, cavity development was resumed with verification of coating reproducibility, achieving stable coating and improved cavity performance. In parallel, coating studies using a coupon cavity equipped with sample holders have been initiated. This approach enables preparation of samples that reproduce the Nb$_3$Sn film formed on the cavity inner surface, allowing more detailed surface characterization than in conventional sample studies. We will report recent progress in Nb$_3$Sn cavity development after furnace relocation, together with the results of surface characterization using these samples.
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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