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Title: Laser polishing of niobium for application to superconducting radio frequency cavities

Abstract

Superconducting radio frequency niobium cavities are at the heart of an increasing number of particle accelerators. Their performance is dominated by a several nanometer thick layer at the interior surface. Maximizing the smoothness of this surface is critical, and aggressive chemical treatments are now employed to this end. The authors describe laser-induced surface melting as an alternative 'greener' approach. Selection of laser parameters guided by modeling achieved melting that reduced the surface roughness from the fabrication process. The resulting topography was examined by scanning electron microscope and atomic force microscope (AFM). Plots of power spectral density computed from the AFM data give further insight into the effect of laser melting on the topography of the mechanically polished (only) niobium.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1052213
Report Number(s):
JLAB-FEL-12-1638; DOE/OR/23177-2330
Journal ID: ISSN 1071-1023; TRN: US1300382
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science & Technology B
Additional Journal Information:
Journal Volume: 30; Journal Issue: 5; Journal ID: ISSN 1071-1023
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE

Citation Formats

Singaravelu, Senthil, Klopf, John Michael, Xu, Chen, Krafft, Geoffrey, and Kelley, Michael J. Laser polishing of niobium for application to superconducting radio frequency cavities. United States: N. p., 2012. Web. doi:10.1116/1.4752216.
Singaravelu, Senthil, Klopf, John Michael, Xu, Chen, Krafft, Geoffrey, & Kelley, Michael J. Laser polishing of niobium for application to superconducting radio frequency cavities. United States. https://doi.org/10.1116/1.4752216
Singaravelu, Senthil, Klopf, John Michael, Xu, Chen, Krafft, Geoffrey, and Kelley, Michael J. 2012. "Laser polishing of niobium for application to superconducting radio frequency cavities". United States. https://doi.org/10.1116/1.4752216.
@article{osti_1052213,
title = {Laser polishing of niobium for application to superconducting radio frequency cavities},
author = {Singaravelu, Senthil and Klopf, John Michael and Xu, Chen and Krafft, Geoffrey and Kelley, Michael J.},
abstractNote = {Superconducting radio frequency niobium cavities are at the heart of an increasing number of particle accelerators. Their performance is dominated by a several nanometer thick layer at the interior surface. Maximizing the smoothness of this surface is critical, and aggressive chemical treatments are now employed to this end. The authors describe laser-induced surface melting as an alternative 'greener' approach. Selection of laser parameters guided by modeling achieved melting that reduced the surface roughness from the fabrication process. The resulting topography was examined by scanning electron microscope and atomic force microscope (AFM). Plots of power spectral density computed from the AFM data give further insight into the effect of laser melting on the topography of the mechanically polished (only) niobium.},
doi = {10.1116/1.4752216},
url = {https://www.osti.gov/biblio/1052213}, journal = {Journal of Vacuum Science & Technology B},
issn = {1071-1023},
number = 5,
volume = 30,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 2012},
month = {Sat Sep 01 00:00:00 EDT 2012}
}