Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity
We report radio-frequency measurements of quality factors and temperature mapping of a nitrogen doped Nb superconducting RF cavity. Cavity cutouts of hot and cold spots were studied with low temperature scanning tunneling microscopy and spectroscopy, X-ray photoelectron spectroscopy and secondary el...
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| Format: | Article |
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Frontiers Media S.A.
2023-08-01
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| Series: | Frontiers in Electronic Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/femat.2023.1235918/full |
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| author | Eric M. Lechner Eric M. Lechner Basu Dev Oli Junki Makita Gianluigi Ciovati Gianluigi Ciovati Alex Gurevich Maria Iavarone |
| author_facet | Eric M. Lechner Eric M. Lechner Basu Dev Oli Junki Makita Gianluigi Ciovati Gianluigi Ciovati Alex Gurevich Maria Iavarone |
| author_sort | Eric M. Lechner |
| collection | DOAJ |
| description | We report radio-frequency measurements of quality factors and temperature mapping of a nitrogen doped Nb superconducting RF cavity. Cavity cutouts of hot and cold spots were studied with low temperature scanning tunneling microscopy and spectroscopy, X-ray photoelectron spectroscopy and secondary electron microscopy. Temperature mapping revealed a substantial reduction of the residual resistance upon cooling the cavity with a greater temperature gradient and hysteretic losses at the quench location, pointing to trapped vortices as the dominant source of residual surface resistance. Analysis of the tunneling spectra in the framework of a proximity effect theory shows that hot spots have a reduced pair potential and a wider distribution of the contact resistance between the Nb and the top Nb oxide. Alone, these degraded superconducting properties account for a much weaker excess dissipation as compared with the vortex contribution. Based on the correlation between the quasiparticle density of states and temperature mapping, we suggest that degraded superconducting properties may facilitate vortex nucleation or settling of trapped flux during cooling the cavity through the critical temperature. |
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| format | Article |
| id | doaj.art-852e5ea49cc543d88d50052d8f8fbf5a |
| institution | Directory Open Access Journal |
| issn | 2673-9895 |
| language | English |
| last_indexed | 2024-04-24T14:06:43Z |
| publishDate | 2023-08-01 |
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| series | Frontiers in Electronic Materials |
| spelling | doaj.art-852e5ea49cc543d88d50052d8f8fbf5a2024-04-03T10:19:25ZengFrontiers Media S.A.Frontiers in Electronic Materials2673-98952023-08-01310.3389/femat.2023.12359181235918Characterization of dissipative regions of a N-doped superconducting radio-frequency cavityEric M. Lechner0Eric M. Lechner1Basu Dev Oli2Junki Makita3Gianluigi Ciovati4Gianluigi Ciovati5Alex Gurevich6Maria Iavarone7Department of Physics, Temple University, Philadelphia, PA, United StatesThomas Jefferson National Accelerator Facility, Newport News, VA, United StatesDepartment of Physics, Temple University, Philadelphia, PA, United StatesCenter for Accelerator Science, Department of Physics, Old Dominion University, Norfolk, VA, United StatesThomas Jefferson National Accelerator Facility, Newport News, VA, United StatesCenter for Accelerator Science, Department of Physics, Old Dominion University, Norfolk, VA, United StatesCenter for Accelerator Science, Department of Physics, Old Dominion University, Norfolk, VA, United StatesDepartment of Physics, Temple University, Philadelphia, PA, United StatesWe report radio-frequency measurements of quality factors and temperature mapping of a nitrogen doped Nb superconducting RF cavity. Cavity cutouts of hot and cold spots were studied with low temperature scanning tunneling microscopy and spectroscopy, X-ray photoelectron spectroscopy and secondary electron microscopy. Temperature mapping revealed a substantial reduction of the residual resistance upon cooling the cavity with a greater temperature gradient and hysteretic losses at the quench location, pointing to trapped vortices as the dominant source of residual surface resistance. Analysis of the tunneling spectra in the framework of a proximity effect theory shows that hot spots have a reduced pair potential and a wider distribution of the contact resistance between the Nb and the top Nb oxide. Alone, these degraded superconducting properties account for a much weaker excess dissipation as compared with the vortex contribution. Based on the correlation between the quasiparticle density of states and temperature mapping, we suggest that degraded superconducting properties may facilitate vortex nucleation or settling of trapped flux during cooling the cavity through the critical temperature.https://www.frontiersin.org/articles/10.3389/femat.2023.1235918/fullsuperconductivitysuperconducting RF cavitieselectron tunnelingmicroscopyresonatorniobium |
| spellingShingle | Eric M. Lechner Eric M. Lechner Basu Dev Oli Junki Makita Gianluigi Ciovati Gianluigi Ciovati Alex Gurevich Maria Iavarone Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity Frontiers in Electronic Materials superconductivity superconducting RF cavities electron tunneling microscopy resonator niobium |
| title | Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity |
| title_full | Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity |
| title_fullStr | Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity |
| title_full_unstemmed | Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity |
| title_short | Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity |
| title_sort | characterization of dissipative regions of a n doped superconducting radio frequency cavity |
| topic | superconductivity superconducting RF cavities electron tunneling microscopy resonator niobium |
| url | https://www.frontiersin.org/articles/10.3389/femat.2023.1235918/full |
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