Improving the work function of the niobium surface of SRF cavities by plasma processing
Abstract
An in situ plasma processing technique using chemically reactive oxygen plasma to remove hydrocarbons from superconducting radio frequency cavity surfaces at room temperature was developed at the spallation neutron source, at Oak Ridge National Laboratory. To understand better the interaction between the plasma and niobium surface, surface studies on small samples were performed. In this article, we report the results from those surface studies. The results show that plasma processing removes hydrocarbons from top surface and improves the surface work function by 0.5₋1.0 eV. Improving the work function of RF surface of cavities can help to improve their operational performance.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1240564
- Alternate Identifier(s):
- OSTI ID: 1358800
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Surface Science
- Additional Journal Information:
- Journal Volume: 369; Journal Issue: C; Journal ID: ISSN 0169-4332
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SRF cavity; Plasma processing; niobium; Surface science; SIMS; SKP
Citation Formats
Tyagi, P. V., Doleans, M., Hannah, B., Afanador, R., McMahan, C., Stewart, S., Mammosser, J., Howell, M., Saunders, J., Degraff, B., and Kim, S. -H. Improving the work function of the niobium surface of SRF cavities by plasma processing. United States: N. p., 2016.
Web. doi:10.1016/j.apsusc.2016.02.030.
Tyagi, P. V., Doleans, M., Hannah, B., Afanador, R., McMahan, C., Stewart, S., Mammosser, J., Howell, M., Saunders, J., Degraff, B., & Kim, S. -H. Improving the work function of the niobium surface of SRF cavities by plasma processing. United States. https://doi.org/10.1016/j.apsusc.2016.02.030
Tyagi, P. V., Doleans, M., Hannah, B., Afanador, R., McMahan, C., Stewart, S., Mammosser, J., Howell, M., Saunders, J., Degraff, B., and Kim, S. -H. Fri .
"Improving the work function of the niobium surface of SRF cavities by plasma processing". United States. https://doi.org/10.1016/j.apsusc.2016.02.030. https://www.osti.gov/servlets/purl/1240564.
@article{osti_1240564,
title = {Improving the work function of the niobium surface of SRF cavities by plasma processing},
author = {Tyagi, P. V. and Doleans, M. and Hannah, B. and Afanador, R. and McMahan, C. and Stewart, S. and Mammosser, J. and Howell, M. and Saunders, J. and Degraff, B. and Kim, S. -H.},
abstractNote = {An in situ plasma processing technique using chemically reactive oxygen plasma to remove hydrocarbons from superconducting radio frequency cavity surfaces at room temperature was developed at the spallation neutron source, at Oak Ridge National Laboratory. To understand better the interaction between the plasma and niobium surface, surface studies on small samples were performed. In this article, we report the results from those surface studies. The results show that plasma processing removes hydrocarbons from top surface and improves the surface work function by 0.5₋1.0 eV. Improving the work function of RF surface of cavities can help to improve their operational performance.},
doi = {10.1016/j.apsusc.2016.02.030},
journal = {Applied Surface Science},
number = C,
volume = 369,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2016},
month = {Fri Jan 01 00:00:00 EST 2016}
}
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