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Publication Information
Title RF surface resistance tuning of superconducting niobium via thermal diffusion of native oxide
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.
Author(s) Eric Lechner, Ari Palczewski, Charlie Reece, John Angle, Fred Stevie, Michael Kelley
Publication Date August 2021
Category SRF Technology
Document Type Journal Article
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
Affiliation Accelerator Ops, R&D / Inst for SRF Sci & Tech / SRF Research & Dev
Funding Source Nuclear Physics (NP)
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-ACC-21-3401 OSTI Number: 1814703
LANL Number: arXiv:2106.06647 Other Number: DOE/OR/23177-5222
Associated with an experiment No
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Journal Article
Journal Name Applied Physics Letters
Refereed Yes
Volume 119
Issue
Page(s) 082601
Attachments/Datasets/DOI Link
Document(s)
APL21-AR-04954.pdf (Accepted Manuscript)
DOI Link
Dataset(s) (none)
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