Study of Flux Pinning in Thick Film REBCO Coated Conductors Over a Wide Range of Magnetic Fields and Temperatures

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dc.contributor.advisorSelvamanickam, Venkat
dc.contributor.committeeMemberWolfe, John C.
dc.contributor.committeeMemberKulkarni, Yashashree
dc.contributor.committeeMemberArdebili, Haleh
dc.contributor.committeeMemberRyou, Jae-Hyun
dc.creatorKochat, Mehdi
dc.creator.orcid0000-0002-2928-0718
dc.date.accessioned2020-06-02T03:04:10Z
dc.date.createdMay 2020
dc.date.issued2020-05
dc.date.submittedMay 2020
dc.date.updated2020-06-02T03:04:11Z
dc.description.abstractRE-Ba-Cu-O (REBCO, RE = rare earth) coated conductors are approaching the large-scale electric power and magnetic applications over a wide range of temperatures and magnetic fields owing to their high critical current density (Jc), their high critical temperature (Tc) and their strong irreversibility field (Hirr). However, further enhancement of the engineering critical current (Je) is required to make REBCO more cost-effective. Improving Je can be achieved by combining two strategies: achieving a thickness independent Jc and enhancing the flux pinning landscape in REBCO through the incorporation of artificial pinning centers (APC). In this work, are studied REBCO tapes deposited using an advanced metal organic vapor deposition process (A-MOCVD) allowing the growth of up to 5 µm thick high performing REBCO films without a deterioration in Jc. BaMO3 (M: Zr, Hf, and Nb) self-assembled nanorods with different concentrations up to 15 mol% were incorporated into REBCO to enhance their Jc over a wide range of temperature (4.2—77 K) and applied magnetic field (0—31 T). The effect of the density, size, and continuity of the BMOs were systematically studied revealing a stronger contribution of the continuous and dense nanorods to the Jc at high magnetic fields and low temperatures. Additionally, BaZrO3 doped REBCO were subject to post-deposition tensile-creep-deformation at 580°C leading to an increase in the density of ab-plane stacking faults which correlated with up to 3 times higher critical current than a reference sample at 77 K and 1 T when the magnetic field is parallel to the ab-plane. Finally, Artificial Neural Networks (ANN) were trained to accurately predict lower temperature critical currents out of the 65 K critical currents. The ANN predictions showed an average error of 2.8% at 4.2 K and 13 T when applied on a validation dataset containing 100 samples.
dc.description.departmentMechanical Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: Kochat, Mehdi, Rudra Pratap, Eduard Galstyan, Goran Majkic, and Venkat Selvamanickam. "Electromagnetic Properties of Thick Film REBCO Tapes." IEEE Transactions on Applied Superconductivity 29, no. 5 (2019): 1-4. And in: Kochat, Mehdi, Eduard Galstyan, and Venkat Selvamanickam. "Enhancement of the electromagnetic properties of fully-processed REBCO tapes by high-temperature tensile-creep deformation." Superconductor Science and Technology 33, no. 5 (2020): 055005.
dc.identifier.urihttps://hdl.handle.net/10657/6563
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectFlux pinning
dc.subjectREBCO coated conductors
dc.subjectMachine Learning
dc.subjectcritical current density
dc.titleStudy of Flux Pinning in Thick Film REBCO Coated Conductors Over a Wide Range of Magnetic Fields and Temperatures
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2022-05-01
local.embargo.terms2022-05-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentMechanical Engineering, Department of
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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