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Title: Effect of interstitial impurities on the field dependent microwave surface resistance of niobium

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4960801· OSTI ID:22594353
 [1]; ; ; ; ;  [1];  [2]
  1. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  2. Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 (United States)

Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in the material. This effect is attributed to the lowering of the Mattis-Bardeen surface resistance with increasing accelerating field; however, the microscopic origin of this phenomenon is poorly understood. Meanwhile, an enhancement of the sensitivity to trapped magnetic field is typically observed for such cavities. In this paper, we conduct a systematic study on these different components contributing to the total surface resistance as a function of different levels of dissolved nitrogen, in comparison with standard surface treatments for niobium resonators. Adding these results together, we are able to show which is the optimum surface treatment that maximizes the Q-factor of superconducting niobium resonators as a function of expected trapped magnetic field in the cavity walls. These results also provide insights on the physics behind the change in the field dependence of the Mattis-Bardeen surface resistance, and of the trapped magnetic vortex induced losses in superconducting niobium resonators.

OSTI ID:
22594353
Journal Information:
Applied Physics Letters, Vol. 109, Issue 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
Country of Publication:
United States
Language:
English

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Unprecedented quality factors at accelerating gradients up to 45 MVm −1 in niobium superconducting resonators via low temperature nitrogen infusion journal August 2017
Revealing the role of nitrogen on hydride nucleation and stability in pure niobium using first-principles calculations journal October 2018
Simple model for the rf field amplitude dependence of the trapped flux sensitivity in superconducting rf cavities journal February 2019
Time-dependent Ginzburg-Landau treatment of rf magnetic vortices in superconductors: Vortex semiloops in a spatially nonuniform magnetic field journal March 2020
Revealing the role of nitrogen on hydride nucleation and stability in pure niobium using first principles calculations text January 2018
Axion production and detection with superconducting RF cavities text January 2019
Ultra-Low Surface Resistance via Vacuum Heat Treatment of Superconducting Radiofrequency Cavities text January 2019
Time-dependent Ginzburg-Landau treatment of RF Magnetic Vortices in Superconductors: Vortex-Semiloops in a Spatially Nonuniform Magnetic Field text January 2019
Flux expulsion in niobium superconducting radio-frequency cavities of different purity and essential contributions to the flux sensitivity text January 2019