Improving the work function of the niobium surface of SRF cavities by plasma processing

P. V. Tyagi; M. Doleans; B. Hannah; R. Afanador; C. McMahan; S. Stewart; J. Mammosser; M. Howell; J. Saunders; B. Degraff; S. H. Kim

doi:10.1016/j.apsusc.2016.02.030

Improving the work function of the niobium surface of SRF cavities by plasma processing

P. V. Tyagi, M. Doleans, B. Hannah, R. Afanador, C. McMahan, S. Stewart, J. Mammosser, M. Howell, J. Saunders, B. Degraff, S. H. Kim

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

An in situ plasma processing technique using chemically reactive oxygen plasma to remove hydrocarbons from superconducting radio frequency cavity surfaces at room temperature has been 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.

Original language	English
Pages (from-to)	29-35
Number of pages	7
Journal	Applied Surface Science
Volume	369
DOIs	https://doi.org/10.1016/j.apsusc.2016.02.030
State	Published - Apr 30 2016
Externally published	Yes

Funding

The authors express their gratitude toward Department of Energy (DOE), USA for funding support of the work presented here under the contract DE-AC05-00OR22725.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725

Keywords

Hydrocarbons removal
Niobium surface
Plasma processing
SRF cavity
Scanning kelvin probe
Secondary Ion Mass Spectroscopy
Surface science
Work function

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10.1016/j.apsusc.2016.02.030

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title = "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 has been 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.",

keywords = "Hydrocarbons removal, Niobium surface, Plasma processing, SRF cavity, Scanning kelvin probe, Secondary Ion Mass Spectroscopy, Surface science, Work function",

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AU - Tyagi, P. V.

AU - Doleans, M.

AU - Hannah, B.

AU - Afanador, R.

AU - McMahan, C.

AU - Stewart, S.

AU - Mammosser, J.

AU - Howell, M.

AU - Saunders, J.

AU - Degraff, B.

AU - Kim, S. H.

N1 - Publisher Copyright: © Published by Elsevier B.V.

PY - 2016/4/30

Y1 - 2016/4/30

N2 - An in situ plasma processing technique using chemically reactive oxygen plasma to remove hydrocarbons from superconducting radio frequency cavity surfaces at room temperature has been 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.

AB - An in situ plasma processing technique using chemically reactive oxygen plasma to remove hydrocarbons from superconducting radio frequency cavity surfaces at room temperature has been 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.

KW - Hydrocarbons removal

KW - Niobium surface

KW - Plasma processing

KW - SRF cavity

KW - Scanning kelvin probe

KW - Secondary Ion Mass Spectroscopy

KW - Surface science

KW - Work function

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Improving the work function of the niobium surface of SRF cavities by plasma processing

Abstract

Funding

Keywords

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