Effect of Surface Flow on Topography in Niobium Electropolishing

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Electropolishing (EP) is reliably delivering improved performance of multi-celled niobium SRF accelerator cavities, attributed to the smoother surface obtained. This superior leveling is a consequence of an etchant concentration gradient layer that arises in the HF-H2SO4 electrolyte adjacent to the niobium surface during polishing. Electrolyte circulation raises the prospect that fluid flow adjacent to the surface might affect the diffusion layer and impair EP performance. In this study, preliminary bench-top experiments with a moving electrode apparatus were conducted. We find that flow conditions approximating cavity EP show no effects attributable to depletion layer disruption.

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Kelley, M. J.; Reece, C. E. & Zhao, L. March 1, 2011.

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Electropolishing (EP) is reliably delivering improved performance of multi-celled niobium SRF accelerator cavities, attributed to the smoother surface obtained. This superior leveling is a consequence of an etchant concentration gradient layer that arises in the HF-H2SO4 electrolyte adjacent to the niobium surface during polishing. Electrolyte circulation raises the prospect that fluid flow adjacent to the surface might affect the diffusion layer and impair EP performance. In this study, preliminary bench-top experiments with a moving electrode apparatus were conducted. We find that flow conditions approximating cavity EP show no effects attributable to depletion layer disruption.

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  • PAC 2011, 28 Mar - 1 Apr 2011, New York, NY

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  • Report No.: JLAB-FEL-11-1432
  • Report No.: DOE/OR/23177-1956
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1032452
  • Archival Resource Key: ark:/67531/metadc835053

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  • March 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 3:13 p.m.

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Kelley, M. J.; Reece, C. E. & Zhao, L. Effect of Surface Flow on Topography in Niobium Electropolishing, article, March 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc835053/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.