Improvement and protection of niobium surface superconductivity by atomic layer deposition and heat treatment

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Description

A method to treat the surface of Nb is described, which potentially can improve the performance of superconducting rf cavities. We present tunneling and x-ray photoemission spectroscopy measurements at the surface of cavity-grade niobium samples coated with a 3 nm alumina overlayer deposited by atomic layer deposition. The coated samples baked in ultrahigh vacuum at low temperature degraded superconducting surface. However, at temperatures above 450 C, the tunneling conductance curves show significant improvements in the superconducting density of states compared with untreated surfaces.

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3 pages

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Proslier, T.; Zasadzinski, J.; Moore, J.; Pellin, M.; Elam, J.; Cooley, L. et al. November 1, 2008.

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Description

A method to treat the surface of Nb is described, which potentially can improve the performance of superconducting rf cavities. We present tunneling and x-ray photoemission spectroscopy measurements at the surface of cavity-grade niobium samples coated with a 3 nm alumina overlayer deposited by atomic layer deposition. The coated samples baked in ultrahigh vacuum at low temperature degraded superconducting surface. However, at temperatures above 450 C, the tunneling conductance curves show significant improvements in the superconducting density of states compared with untreated surfaces.

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3 pages

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  • Report No.: FERMILAB-PUB-08-543-TD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 947211
  • Archival Resource Key: ark:/67531/metadc902116

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  • November 1, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • July 26, 2017, 11:28 a.m.

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Proslier, T.; Zasadzinski, J.; Moore, J.; Pellin, M.; Elam, J.; Cooley, L. et al. Improvement and protection of niobium surface superconductivity by atomic layer deposition and heat treatment, article, November 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc902116/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.