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  • 13.12.20

    Rights statement: This is the author’s version of a work that was accepted for publication in Materials Chemistry and Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Chemistry and Physics, 273, 2021 DOI: 10.1016/j.matchemphys.2021.125062

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X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities

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X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities. / Aliasghari, S.; Skeldon, P.; Zhou, X. et al.

In: Materials Chemistry and Physics, Vol. 273, 125062, 15.11.2021.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Aliasghari, S, Skeldon, P, Zhou, X, Gholinia, A, Zhang, X, Valizadeh, R, Pira, C, Junginger, T, Burt, G & Withers, PJ 2021, 'X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities', Materials Chemistry and Physics, vol. 273, 125062. https://doi.org/10.1016/j.matchemphys.2021.125062

APA

Aliasghari, S., Skeldon, P., Zhou, X., Gholinia, A., Zhang, X., Valizadeh, R., Pira, C., Junginger, T., Burt, G., & Withers, P. J. (2021). X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities. Materials Chemistry and Physics, 273, [125062]. https://doi.org/10.1016/j.matchemphys.2021.125062

Vancouver

Aliasghari S, Skeldon P, Zhou X, Gholinia A, Zhang X, Valizadeh R et al. X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities. Materials Chemistry and Physics. 2021 Nov 15;273:125062. Epub 2021 Jul 27. doi: 10.1016/j.matchemphys.2021.125062

Author

Bibtex

@article{263f03f5a70e456ba2a84e0b8e4d34d7,
title = "X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities",
abstract = "A combination of X-ray computed tomography (CT) and focused ion beam - scanning electron microscopy (FIB-SEM) has been employed to investigate substrate and related surface defects in a niobium coated superconducting radio frequency (SRF) copper cavity. The cavity was manufactured by spinning, with subsequent application of a sputtering-deposited niobium coating (≈40 μm thick) on the internal surface. Before coating, the copper surface was pre-treated in several stages, ending with chemical polishing. CT and FIB-SEM identified furrow defects (≈20 μm deep) in the copper beneath the coating, which originated from the spinning process. The furrows were filled with niobium and contained voids at the Nb/Cu interface that extended a few microns into the niobium coating. The presence of the defects led to similar furrows at the niobium surface. The study revealed the importance of pre-treatment of the cavity internal surface and control of the spinning process to avoid defects that may have deleterious influence on the Q slope and durability of the niobium coating. ",
keywords = "Coating, CT, FIB-SEM, Niobium, SRF Cavity, Superconductivity, Coatings, Computerized tomography, Superconducting materials, Coating defects, Computed tomographic, Focused ion beam-scanning electron microscopies, Focused ions beams, Internal surfaces, Niobium coatings, Radio frequency cavity, Spinning process, Superconducting radio frequency, X-ray computed, Scanning electron microscopy",
author = "S. Aliasghari and P. Skeldon and X. Zhou and A. Gholinia and X. Zhang and R. Valizadeh and C. Pira and T. Junginger and G. Burt and P.J. Withers",
note = "This is the author{\textquoteright}s version of a work that was accepted for publication in Materials Chemistry and Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Chemistry and Physics, 273, 2021 DOI: 10.1016/j.matchemphys.2021.125062",
year = "2021",
month = nov,
day = "15",
doi = "10.1016/j.matchemphys.2021.125062",
language = "English",
volume = "273",
journal = "Materials Chemistry and Physics",
issn = "0254-0584",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - X-ray computed tomographic and focused ion beam/electron microscopic investigation of coating defects in niobium-coated copper superconducting radio-frequency cavities

AU - Aliasghari, S.

AU - Skeldon, P.

AU - Zhou, X.

AU - Gholinia, A.

AU - Zhang, X.

AU - Valizadeh, R.

AU - Pira, C.

AU - Junginger, T.

AU - Burt, G.

AU - Withers, P.J.

N1 - This is the author’s version of a work that was accepted for publication in Materials Chemistry and Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Chemistry and Physics, 273, 2021 DOI: 10.1016/j.matchemphys.2021.125062

PY - 2021/11/15

Y1 - 2021/11/15

N2 - A combination of X-ray computed tomography (CT) and focused ion beam - scanning electron microscopy (FIB-SEM) has been employed to investigate substrate and related surface defects in a niobium coated superconducting radio frequency (SRF) copper cavity. The cavity was manufactured by spinning, with subsequent application of a sputtering-deposited niobium coating (≈40 μm thick) on the internal surface. Before coating, the copper surface was pre-treated in several stages, ending with chemical polishing. CT and FIB-SEM identified furrow defects (≈20 μm deep) in the copper beneath the coating, which originated from the spinning process. The furrows were filled with niobium and contained voids at the Nb/Cu interface that extended a few microns into the niobium coating. The presence of the defects led to similar furrows at the niobium surface. The study revealed the importance of pre-treatment of the cavity internal surface and control of the spinning process to avoid defects that may have deleterious influence on the Q slope and durability of the niobium coating.

AB - A combination of X-ray computed tomography (CT) and focused ion beam - scanning electron microscopy (FIB-SEM) has been employed to investigate substrate and related surface defects in a niobium coated superconducting radio frequency (SRF) copper cavity. The cavity was manufactured by spinning, with subsequent application of a sputtering-deposited niobium coating (≈40 μm thick) on the internal surface. Before coating, the copper surface was pre-treated in several stages, ending with chemical polishing. CT and FIB-SEM identified furrow defects (≈20 μm deep) in the copper beneath the coating, which originated from the spinning process. The furrows were filled with niobium and contained voids at the Nb/Cu interface that extended a few microns into the niobium coating. The presence of the defects led to similar furrows at the niobium surface. The study revealed the importance of pre-treatment of the cavity internal surface and control of the spinning process to avoid defects that may have deleterious influence on the Q slope and durability of the niobium coating.

KW - Coating

KW - CT

KW - FIB-SEM

KW - Niobium

KW - SRF Cavity

KW - Superconductivity

KW - Coatings

KW - Computerized tomography

KW - Superconducting materials

KW - Coating defects

KW - Computed tomographic

KW - Focused ion beam-scanning electron microscopies

KW - Focused ions beams

KW - Internal surfaces

KW - Niobium coatings

KW - Radio frequency cavity

KW - Spinning process

KW - Superconducting radio frequency

KW - X-ray computed

KW - Scanning electron microscopy

U2 - 10.1016/j.matchemphys.2021.125062

DO - 10.1016/j.matchemphys.2021.125062

M3 - Journal article

VL - 273

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

M1 - 125062

ER -