Publications
Publication Information
| Title | Managing Sn-supply to tune surface characteristics of vapor-diffusion coating of Nb3Sn |
| Authors | Uttar Pudasaini, Charles Reece, Jayendrika Tiskumara |
| JLAB number | JLAB-ACC-21-3443 |
| LANL number | (None) |
| Other number | DOE/OR/23177-5255 |
| Document Type(s) | (Meeting) |
| Category: | SRF Technology |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Meeting Poster compiled for SRF 2021 | |
| Publication Abstract: | Nb3Sn promises better RF performance (Q and Eacc) than niobium at any given temperature because of superior superconducting properties. Nb3Sn-coated SRF cavities are now produced routinely by growing a few microns thick Nb3Sn films inside Nb cavities via the tin vapor diffusion technique. Sn evaporation and consumption during the growth process notably affect the quality of the coating. Aiming at favorable surface characteristics that could enhance the RF performance, many coatings were produced by varying Sn sources and temperature profiles. Coupon samples were examined using different material characterization techniques, and a selected few sets of coating parameters were used to coat 1.3 GHz single-cell cavities for RF testing. The Sn supply's careful tuning is essential to manage the microstructure, roughness, and overall surface characteristics of the coating. We summarize the material analysis of witness samples and discuss the performance of several Nb3Sn-coated single-cell cavities linked to Sn-source characteristics and observed Sn consumption during the film growth process. |
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| Group: | SRF Research & Dev |
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