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Title: Laser polishing of niobium for superconducting radio-frequency accelerator applications

Abstract

Interior surfaces of niobium cavities used in superconducting radio frequency accelerators are now obtained by buffered chemical polish and/or electropolish. Laser polishing is a potential alternative, having advantages of speed, freedom from noxious chemistry and availability of in-process inspection. We studied the influence of the laser power density and laser beam raster rate on the surface topography. These two factors need to be combined carefully to smooth the surface without damage. Computational modeling was used to estimate the surface temperature and gain insight into the mechanism of laser polishing. Power spectral density analysis of surface topography measurements shows that laser polishing can produce smooth topography similar to that obtained by electropolish. This is a necessary first step toward introducing laser polishing as an alternative to the currently practiced chemical polishing.

Authors:
 [1];  [1];  [2];  [2]
  1. William and Mary College
  2. JLAB
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1150700
Report Number(s):
JLAB-ACC-14-1927; DOE/OR/23177-3166
Journal ID: ISSN 1098--4402
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. ST Accel. Beams; Journal Volume: 17; Journal Issue: 08
Country of Publication:
United States
Language:
English

Citation Formats

Zhao, Liang, Klopf, John M., Reece, Charles E., and Kelley, Michael J.. Laser polishing of niobium for superconducting radio-frequency accelerator applications. United States: N. p., 2014. Web. doi:10.1103/PhysRevSTAB.17.083502.
Zhao, Liang, Klopf, John M., Reece, Charles E., & Kelley, Michael J.. Laser polishing of niobium for superconducting radio-frequency accelerator applications. United States. doi:10.1103/PhysRevSTAB.17.083502.
Zhao, Liang, Klopf, John M., Reece, Charles E., and Kelley, Michael J.. Fri . "Laser polishing of niobium for superconducting radio-frequency accelerator applications". United States. doi:10.1103/PhysRevSTAB.17.083502.
@article{osti_1150700,
title = {Laser polishing of niobium for superconducting radio-frequency accelerator applications},
author = {Zhao, Liang and Klopf, John M. and Reece, Charles E. and Kelley, Michael J.},
abstractNote = {Interior surfaces of niobium cavities used in superconducting radio frequency accelerators are now obtained by buffered chemical polish and/or electropolish. Laser polishing is a potential alternative, having advantages of speed, freedom from noxious chemistry and availability of in-process inspection. We studied the influence of the laser power density and laser beam raster rate on the surface topography. These two factors need to be combined carefully to smooth the surface without damage. Computational modeling was used to estimate the surface temperature and gain insight into the mechanism of laser polishing. Power spectral density analysis of surface topography measurements shows that laser polishing can produce smooth topography similar to that obtained by electropolish. This is a necessary first step toward introducing laser polishing as an alternative to the currently practiced chemical polishing.},
doi = {10.1103/PhysRevSTAB.17.083502},
journal = {Phys. Rev. ST Accel. Beams},
number = 08,
volume = 17,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}