Proximity breakdown of hydrides in superconducting niobium cavities

Many modern and proposed future particle accelerators rely on superconducting radio frequency cavities made of bulk niobium as primary particle accelerating structures. Such cavities suffer from the anomalous field dependence of their quality factors Q0. High field degradation-so-called 'high f...

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Bibliographic Details
Published inSuperconductor science & technology Vol. 26; no. 3; pp. 35003 - 5
Main Authors Romanenko, A, Barkov, F, Cooley, L D, Grassellino, A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.03.2013
Institute of Physics
Subjects
Applied sciences
Breakdown
Cures
Electronics
Exact sciences and technology
Holes
Hydrides
Niobium
Quality factor
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Superconductivity
Q factor
High field
Hydrides
Particle acceleration
Superconductor device
Radiofrequency
Niobium
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Summary:Many modern and proposed future particle accelerators rely on superconducting radio frequency cavities made of bulk niobium as primary particle accelerating structures. Such cavities suffer from the anomalous field dependence of their quality factors Q0. High field degradation-so-called 'high field Q-slope'-is so far unexplained even though an empirical cure is known. Here, we propose a mechanism based on the presence of proximity-coupled niobium hydrides that can explain this effect. Furthermore, the same mechanism can be present in any surface-sensitive experiments or superconducting devices involving niobium.
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ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/26/3/035003