Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities
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 microsc...
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American Physical Society
2012-04-01
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Series: | Physical Review Special Topics. Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevSTAB.15.043502 |
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doaj-fae7169146b84407b4bf5049b628730a2020-11-25T02:13:59ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022012-04-0115404350210.1103/PhysRevSTAB.15.043502Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavitiesChen XuHui TianCharles E. ReeceMichael J. KelleyMicroroughness 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.http://doi.org/10.1103/PhysRevSTAB.15.043502 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chen Xu Hui Tian Charles E. Reece Michael J. Kelley |
spellingShingle |
Chen Xu Hui Tian Charles E. Reece Michael J. Kelley Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities Physical Review Special Topics. Accelerators and Beams |
author_facet |
Chen Xu Hui Tian Charles E. Reece Michael J. Kelley |
author_sort |
Chen Xu |
title |
Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities |
title_short |
Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities |
title_full |
Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities |
title_fullStr |
Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities |
title_full_unstemmed |
Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities |
title_sort |
topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities |
publisher |
American Physical Society |
series |
Physical Review Special Topics. Accelerators and Beams |
issn |
1098-4402 |
publishDate |
2012-04-01 |
description |
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. |
url |
http://doi.org/10.1103/PhysRevSTAB.15.043502 |
work_keys_str_mv |
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