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Influence of Material Properties and Processing on Stability and Protectability in Superconducting Cables and Composites

Kovacs, Christopher Joseph
http://orcid.org/0000-0002-3625-7516
http://rave.ohiolink.edu/etdc/view?acc_num=osu1574650528575944

Abstract Details

2019, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
A next generation high field accelerator magnet (>15 T @ 4.2 K) has yet to be achieved. The superconducting accelerator magnet has three major parts; the superconducting composite winding, the wrapped insulation, and the impregnation. The conductor/wrap/impregnation (CWI) composite has a multitude of material and interfacial properties that determine the magnet’s “stability” and “protectability”. These two metrics are important to the successful operation of a superconducting accelerator magnet. The superconducting state within an accelerator magnet is exposed to a multitude of instability mechanisms which can lead to a local superconductive to normal state transition. This “normal zone” can recover to the superconducting state or can grow catastrophically in the form of a quench. Stability, the ability of the CWI composite to avert a quench, is determined by minimum quench power (MQP) and minimum quench energy (MQE). Protectability, the ability of a magnet constructed out of a CWI composites to mitigate a quench, is determined by the maximum voltages, temperatures, and mechanical stresses generated during a quench and the ability of the CWI composite to handle that exposure. In this document, material properties related to stability and protectability are discussed for CWI composites composed of Nb3Sn or Rare Earth Barium Copper Oxide (REBCO) superconductors. This work discusses composite structure and processing in the context of CWI composite stability and protectability. Analytical models will be used to generate quick solutions and expectations that accompany changes in the CWI composite. Single strand superconducting composites, superconducting cable composites, and entire CWI composites have been measured under current excitation by various sources, including a 30 kA superconducting transformer. Two special materials selections: (i) a high thermal conductivity impregnant and (ii) a metal to insulator transitioning insert for interconductor contacts, have been integrated into a CWI composite and their properties measured. It was shown that MQP is the property of concern for REBCO composites and that structure and processing, a strong determining factor for stability, stability and protectability, can simultaneously be enhanced (i) by the use of a new high thermal conductivity impregnation, and (ii) nanoparticle consolidations which can function as metal to insulator transitioning inserts for REBCO coated conductor interfaces.
Michael Sumption, Prof. (Advisor)
Sheikh Akbar, Prof. (Committee Member)
Tyler Grassman, Prof. (Committee Member)
220 p.
Materials Science
superconducting cable; Nb3Sn; REBCO; HTS; Accelerator Magnets; Stability; protection; processing; materials; material properties

Recommended Citations

Citations

  • Kovacs, C. J. (2019). Influence of Material Properties and Processing on Stability and Protectability in Superconducting Cables and Composites [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574650528575944

    APA Style (7th edition)

  • Kovacs, Christopher. Influence of Material Properties and Processing on Stability and Protectability in Superconducting Cables and Composites. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1574650528575944.

    MLA Style (8th edition)

  • Kovacs, Christopher. "Influence of Material Properties and Processing on Stability and Protectability in Superconducting Cables and Composites." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574650528575944

    Chicago Manual of Style (17th edition)

osu1574650528575944
489
© 2019, some rights reserved.Creative Commons License Influence of Material Properties and Processing on Stability and Protectability in Superconducting Cables and Composites by Christopher Joseph Kovacs is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.