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The Effect of Defects on Functional Properties of Niobium for Superconducting Radio-Frequency Cavities: A First-Principles Study

Abstract Niobium is the primary material for fabricating superconducting radio-frequency (SRF) cavities. However, presence of impurities and defects degrade the superconducting behavior of niobium twofold, first by nucleating non-superconducting phases and second by increasing the residual surface resistance of cavities. In particular, niobium absorbs hydrogen during cavity fabrication and promotes precipitation of non-superconducting niobium hydride phases. Additionally, magnetic flux trapping at defects leads to a normal conducting (non-superconducting) core which increases surface resistance and negatively affects niobium performance for superconducting applications. However, undelaying mechanisms related to hydride formation and dissolution alon... (more)
Created Date 2019
Contributor Garg, Pulkit (Author) / Solanki, Kiran N (Advisor) / Jiao, Yang (Committee member) / Oswald, Jay (Committee member) / Arizona State University (Publisher)
Subject Materials Science / Flux trapping / Grain Boundaries / Hydrogen / Niobium / SRF cavities / Superconducting
Type Doctoral Dissertation
Extent 111 pages
Language English
Note Doctoral Dissertation Materials Science and Engineering 2019
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS

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Description Dissertation/Thesis