Publications
Publication Information
| Title | RF surface resistance tuning of superconducting niobium via thermal diffusion of native oxide | ||
| Authors | Eric Lechner, Ari Palczewski, Charles Reece, John Angle, Fred Stevie, Michael Kelley | ||
| JLAB number | JLAB-ACC-21-3401 | ||
| LANL number | arXiv:2106.06647 | ||
| Other number | DOE/OR/23177-5222 | ||
| Document Type(s) | (Journal Article) | ||
| Category: | SRF Technology |
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| Associated with EIC: | No | ||
| Supported by Jefferson Lab LDRD Funding: | No | ||
| Funding Source: | Nuclear Physics (NP) | ||
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Journal Compiled for Applied Physics Letters Volume 119 Page(s) 082601 Refereed | |||
| Publication Abstract: | Extremely low RF surface resistance of superconducting niobium has been realized via interstitial thermal diffusion of several atomic species into the surface. Recently, Nb superconducting radio frequency cavities vacuum heat treated between 300-400°C for a few hours have exhibited very high quality factors (~5×1010 at 2.0 K). New secondary ion mass spectrometry measurements of O, N and C show this enhancement in RF surface conductivity is primarily associated with interstitial oxygen diffusion and doping via dissolution of the native oxide. We apply a theory of oxygen decomposition and diffusion to quantify previously unknown parameters crucial in modeling this process. Radio frequency measurements of a vacuum heat treated Nb superconducting radio frequency cavity confirm the minimized surface resistance previously expected only from 800°C diffusive doping with nitrogen. | ||
| Experiment Numbers: | other | ||
| Group: | SRF Research & Dev | ||
| Document: | |||
| DOI: | https://doi.org/10.1063/5.0059464 | ||
| Accepted Manuscript: | APL21-AR-04954.pdf | ||
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