Flux Pinning Study Of Reba2cu3o7 Delta Coated Conductors For High Field Magnet Applications

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Flux Pinning Study Of Reba2cu3o7 Delta Coated Conductors For High Field Magnet Applications

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Author : Aixia Xu
language : en
Publisher:
Release Date : 2012

Flux Pinning Study Of Reba2cu3o7 Delta Coated Conductors For High Field Magnet Applications written by Aixia Xu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Materials science categories.

ABSTRACT: REBa2Cu3O7-delta (REBCO, RE = rare earth) coated conductor (CC) holds great promise for high field magnet applications owing to its strong irreversibility field (Hirr), low electromagnetic anisotropy (gamma2), and high critical current density (Jc). The work of this thesis is tightly related to the development of the funded 32 T, all-superconducting magnet project at the ASC/NHMFL. My concern is thus for understanding the optimizing of the working parameters of REBCO CC at low temperatures T, and very high magnetic fields H, focusing on how to enhance Ic and to reduce its angular dependence. Increasing the active cross:section is a direct and economical strategy to enhance the current:carrying capability for REBCO coated conductors. Unfortunately, the high Jc in thin REBCO layers is seldom sustained in thick layers because of difficulties of thick film growth control. In the presence of strong 3D (pin separation far less than film thickness) pins, a high and thickness-independent (Jc) should result. One of major tasks of this thesis is to explore what are the effective strong 3D pins that develop a high and thickness-independent Jc. High and weak thickness-dependent Jc at 77 K is obtained on most recent coated conductors, and BZO nanorods and RE2O3 nanoparticles are identified as strong 3D pins contributing to this respectable Jc performance. At 77 K, we found that the strong pinning of BZO nanorods remains at least up to 9 T, whereas the strong pinning of RE2O3 nanoparticles gradually evolves to weak collective pinning as the irreversibility field is approached. The second principal part of this thesis concentrates on understanding and minimizing the angular dependence of Jc. Our study is based on the following procedure. First, we investigated the angular dependence of Jc (Jc(theta)) in the working condition of the future 32 T all-superconducting magnet, i.e. 4.2 K and high magnetic field up to 31 T. Our work shows that the low temperature Jc(theta) is Ginzburg-Landau-like at low fields and cusp-like towards the ab-plane at high fields. More interestingly, the typically observed Jc c-axis peak of BaZrO3 nanorods (BZO)-containing REBCO at high temperatures disappears at T le 40 K. We observed that Jc(H[is parallel to]c) follows well a power law with exponent alpha approx 0.5 for coated conductors without BZO nanorods and alpha approx 0.7 for coated conductors containing BZO nanorods. More importantly, BZO-containing coated conductors show higher and broader Jc(theta) at least up to 31 T, which is strongly beneficial to high field magnet applications. Finally, we performed Jc(theta) study over a broad temperature domain, 4.2 K to Tc and magnet fields up to 31 T. We found that weak uncorrelated pinning dominates the low temperature Jc. It raises and broadens Jc in the full angular range. We conclude that BZO nanorods induce dense random defects, like oxygen vacancies, atomic disorder etc., which can exert a large pinning effect at low temperatures where thermal fluctuations are small. Near the ab-plane there is clear evidence for strong correlated defects, which we deduce is due to intrinsic pinning by the Cu-O charge reservoir layers The last section discusses the pinning design relevant to coated conductors. Two types of thin films made by pulsed laser deposition (PLD) with well designed defects were studied- one shows Y2O3 precipitates and a high strain which also generates dense point pinning; the second one presents dense stacking faults. The main conclusion is that Jc(theta) can be modulated by tailoring the strain introduced by the mismatch between second phases and REBCO layer. Intrinsic pinning governs Hirr(H[is parallel to]ab), and stacking faults govern Jc(H[is parallel to]ab) and enhance Hirr(H[is parallel to]ab) at T ge 40 K. The thesis contains 8 chapters. The first chapter introduces the background and motivation of this work. Chapter 2 presents thickness dependence of Jc studies. Chapter 3 through chapter 6 present Jc(H, T, theta) characterization and pinning studies on REBCO coated conductors. Chapter 7 presents the pinning mechanisms found in PLD thin films grown with designed pinning structures. The summary and future work is presented in chapter 8.

Flux Pinning And Ac Loss Studies On Ybco Coated Conducters

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Author : Mariappan Parans Paranthaman
language : en
Publisher:
Release Date : 2007

Flux Pinning And Ac Loss Studies On Ybco Coated Conducters written by Mariappan Parans Paranthaman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Electric currents, Alternating categories.

Major advances have been made in the last 18 years in high-temperature superconductor (HTS) research and development, resulting in increased use of HTS materials in commercial and pre-commercial electric-power applications. This new and important book addresses the issues related to flux pinning, AC losses and thick YBCO film growth. Written by top most scientists in the world, it presents the current status and issues related to YBCO coated conductors and the need for further fundamental materials science work in YBCO coated conductor. This will be a useful handbook for years to come.

Flux Pinning In Yttrium Barium Copper Oxide Coated Conductors

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Author : Zhijun Chen
language : en
Publisher:
Release Date : 2008

Flux Pinning In Yttrium Barium Copper Oxide Coated Conductors written by Zhijun Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

Study Of Electromagnetic Properties Of Zr Doped Reba2cu3o7 X Coated Conductors Fabricated By Metal Organic Chemical Vapor Deposition Over A Wide Range Of Temperature Magnetic Fields

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Author : Yao Yao
language : en
Publisher:
Release Date : 2012

Study Of Electromagnetic Properties Of Zr Doped Reba2cu3o7 X Coated Conductors Fabricated By Metal Organic Chemical Vapor Deposition Over A Wide Range Of Temperature Magnetic Fields written by Yao Yao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Materials engineering categories.

Zr-doped REBa2Cu3O7-x (REBCO and RE = Gd, Y in this thesis) coated conductors fabricated by the Metal Organic Chemical Vapor Deposition (MOCVD) method has demonstrated excellent in-field performance at 77K and a low magnetic field in previous research. However, the most important and promising applications of HTS coated conductors requires excellent in-field performance at various cryogenic temperatures between 77K and 20K, or even lower temperatures, with a high external magnetic field. In this thesis, REBCO coated conductor samples with different Zr contents (0%-15%) fabricated by the MOCVD method were systematically studied in a series of electromagnetic measurements at a wide range of temperatures and fields. Interesting pinning effects of various Zr-doping levels were observed across the temperature and field range. In order to interpret these pinning phenomena, microstructural analysis was done using SEM and TEM methods to reveal the influence of temperature, field and chemical composition on the performance and microstructure of Zr-doped REBCO coated conductors.

Flux Pinning Of Bi2sr2cacu2o 8 Delta High Tc Superconducting Tapes Utilizing Sr Ca 14cu24o 41 Delta And Sr2caal2o6 Defects

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Author :
language : en
Publisher:
Release Date : 2003

Flux Pinning Of Bi2sr2cacu2o 8 Delta High Tc Superconducting Tapes Utilizing Sr Ca 14cu24o 41 Delta And Sr2caal2o6 Defects written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

Efforts to improve the magnetic flux-pinning properties of Bi2Sr2CaCu2O(8+delta)/Ag (2212/Ag) tape conductors utilizing (Sr(1-x)Ca(x)14Cu24O(41+delta) and Sr2CaAl2O6 defects are described. Precursor powders with composition(2212 + N% volume fraction Sr10Ca4Cu24O(41+delta); N = 0, 7, 15) were prepared by solid-state reaction to obtain subsolidus phase equilibrium at 860 deg C, as measured by X-ray diffraction (XRD). Nanophase (10 - 20 nm)Al2O3 was added (1.1% mass fraction) to N = 0 and 15 fully reacted powders. Brush-on coated tapes (13 - 17 micrometers 2212 thickness) were processed by a partial-melt growth method in air with variable melting from 865 deg C to 890 deg C, and slow-cool recrystallization from 856 deg C to 847 deg C. The effect of different melt temperatures and compositions on film properties (phase assemblages, orientations, and compositions, and defect sizes) was studied by XRD, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS).

Characterization Of Minerals Metals And Materials 2019

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Author : Bowen Li
language : en
Publisher: Springer
Release Date : 2019-02-13

Characterization Of Minerals Metals And Materials 2019 written by Bowen Li and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-13 with Technology & Engineering categories.

This collection gives broad and up-to-date results in the research and development of materials characterization and processing. Topics covered include characterization methods, ferrous materials, non-ferrous materials, minerals, ceramics, polymer and composites, powders, extraction, microstructure, mechanical behavior, processing, corrosion, welding, solidification, magnetic, electronic, environmental, nano-materials, and advanced materials The book explores scientific processes to characterize materials using modern technologies, and focuses on the interrelationships and interdependence among processing, structure, properties, and performance of materials.

Superconductivity

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Author : Paolo Mele
language : en
Publisher: Springer Nature
Release Date : 2019-08-21

Superconductivity written by Paolo Mele and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-21 with Technology & Engineering categories.

This book provides readers with a comprehensive overview of the science of superconducting materials. It serves as a fundamental information source on the actual techniques and methodologies involved in superconducting materials growth, characterization and processing. This book includes coverage of several categories of medium and high-temperature superconducting materials: cuprate oxides, borides, and iron-based chalcogenides and pnictides. Provides a single-source reference on superconducting materials growth, characterization and processing; Bridges the gap between materials science and applications of superconductors; Discusses several categories of superconducting materials such as cuprate oxides, borides, and iron-based chalcogenides and pnictides; Covers synthesis, characterization, and processing of superconducting materials, as well as the nanoengineering approach to tailor the properties of the used materials at the nanoscale level.

Magnetic Superconductors

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Author : A. V. Narlikar
language : en
Publisher: Nova Science Pub Incorporated
Release Date : 2003

Magnetic Superconductors written by A. V. Narlikar and has been published by Nova Science Pub Incorporated this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Science categories.

This volume focuses on the topical area of magnetic superconductors. Rutheno cuprates and quaternary borocarbides are the two frontal materials forming the mainstay of the book. The authors are noted for their pioneering contribution in the field. In all, there are 6 chapters written by 18 researchers from 6 countries taking stock of frontal issues of both experiment and theory. Chapter headings: Phase Separation, Magnetism and Superconductivity in Rutheno-Cuprates; Coexistence of Superconductivity and Magnetism in R2-xCexRuSr2Cu2O10-d(R=Eu and Gd); Magneto-Superconductivity in Rutheno-Cuprates RuSr2GdCu28-d (Ru-1212) AND RuSr2(Gd0.75 Ce0.25)2Cu2O10-d (Ru-1222): A Critical Review; Therman Conductivity in Magnetic Superconductors; Magnon Specific Heat of the Antiferromagnetic Superconductors RNi2B2C [R=Tm, Er, Ho, Dy]; On the Role of the Electronic Structure in the Properties of Pseudo Quaternary Borocarbides.

Experimental Techniques For Low Temperature Measurements

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Author : Jack Ekin
language : en
Publisher: Oxford University Press
Release Date : 2006-10-12

Experimental Techniques For Low Temperature Measurements written by Jack Ekin and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-10-12 with Science categories.

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Superconducting Accelerator Magnets

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Author : K.-H. Mess
language : en
Publisher: World Scientific
Release Date : 1996

Superconducting Accelerator Magnets written by K.-H. Mess and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.

The main topic of the book are the superconducting dipole and quadrupole magnets needed in high-energy accelerators and storage rings for protons, antiprotons or heavy ions. The basic principles of low-temperature superconductivity are outlined with special emphasis on the effects which are relevant for accelerator magnets. Properties and fabrication methods of practical superconductors are described. Analytical methods for field calculation and multipole expansion are presented for coils without and with iron yoke. The effect of yoke saturation and geometric distortions on field quality is studied. Persistent magnetization currents in the superconductor and eddy currents the copper part of the cable are analyzed in detail and their influence on field quality and magnet performance is investigated. Superconductor stability, quench origins and propagation and magnet protection are addressed. Some important concepts of accelerator physics are introduced which are needed to appreciate the demanding requirements on field quality in large storage rings. The operational experience with the superconducting HERA collider serves as an illustration. Finally superconducting correction coils and practical construction and fabrication methods of accelerator magnets are discussed. The physical and technical principles described in the book are substantiated with a wealth of experimental data on multipoles, persistent- and eddy-current effects, quench performance and much more.