Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities

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Microroughness is viewed as a critical issue for attaining optimum performance of superconducting radio frequency accelerator cavities. The principal surface smoothing methods are buffered chemical polish (BCP) and electropolish (EP). The resulting topography is characterized by atomic force microscopy (AFM). The power spectral density (PSD) of AFM data provides a more thorough description of the topography than a single-value roughness measurement. In this work, one dimensional average PSD functions derived from topography of BCP and EP with different controlled starting conditions and durations have been fitted with a combination of power law, K correlation, and shifted Gaussian models to extract ... continued below

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043502 [18 pages]

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Charles Reece, Hui Tian, Michael Kelley, Chen Xu April 1, 2012.

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Microroughness is viewed as a critical issue for attaining optimum performance of superconducting radio frequency accelerator cavities. The principal surface smoothing methods are buffered chemical polish (BCP) and electropolish (EP). The resulting topography is characterized by atomic force microscopy (AFM). The power spectral density (PSD) of AFM data provides a more thorough description of the topography than a single-value roughness measurement. In this work, one dimensional average PSD functions derived from topography of BCP and EP with different controlled starting conditions and durations have been fitted with a combination of power law, K correlation, and shifted Gaussian models to extract characteristic parameters at different spatial harmonic scales. While the simplest characterizations of these data are not new, the systematic tracking of scale-specific roughness as a function of processing is new and offers feedback for tighter process prescriptions more knowledgably targeted at beneficial niobium topography for superconducting radio frequency applications.

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043502 [18 pages]

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  • Journal Name: Physical Review Special Topics - Accelerators and Beams; Journal Volume: 14; Journal Issue: 4

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  • Report No.: JLAB-ACC-12-1487
  • Report No.: DOE/OR/23177-1986
  • Grant Number: AC05-06OR23177
  • DOI: 10.1103/PhysRevSTAB.15.043502 | External Link
  • Office of Scientific & Technical Information Report Number: 1040711
  • Archival Resource Key: ark:/67531/metadc846415

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • April 1, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:07 p.m.

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Charles Reece, Hui Tian, Michael Kelley, Chen Xu. Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities, article, April 1, 2012; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc846415/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.