Abstract
Recent studies of the quality factor degradation mechanisms in superconducting RFniobium cavities at high surface magnetic fields revealed that RF performance may dependon the total hydrogen content in the 40 nm thick near-surface layer. Hydrogen distributionin niobium and its near-surface content variations after different chemical surfacetreatments has been addressed in previous studies. However, only chemical treatments werestudied while heat treatments are equally important. In this work we use the elastic recoildetection (ERD) technique to systematically study the distribution of hydrogen in niobiumsheet and cavity cutout samples subjected to chemical and heat treatments typicallyperformed on niobium cavities. Our results indicate the near-surface segregation ofhydrogen at the niobium oxide/niobium interface, and do not show any significantvariation in hydrogen content after various heat and chemical treatments. We do notobserve a direct correlation between total hydrogen content and the high fieldQ slope. Consequences of the observed hydrogen segregation are discussed in the framework of theNbHx phase diagram.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
