Journal ArticleDOI
Development of magnesium diboride (MgB2) wires and magnets using in situ strand fabrication method
Michael Tomsic,M A Rindfleisch,J. Yue,Kevin McFadden,David Doll,J. Phillips,M.D. Sumption,M. Bhatia,S.D. Bohnenstiehl,E.W. Collings +9 more
TLDR
In this paper, the progress on MgB2 conductor and coil development in the last several years at Hyper Tech Research, Inc. is discussed, and the authors discuss the potential to be integrated in a variety of commercial applications such as magnetic resonance imaging, fault current limiters, transformers, motors, generators, adiabatic demagnetization refrigerators, magnetic separation, magnetic levitation, energy storage and high energy physics applications.Abstract:
Since 2001 when magnesium diboride (MgB2) was first reported to have a transition temperature of 39 K, conductor development has progressed to where MgB2 superconductor wire in kilometer-long piece-lengths has been demonstrated in magnets and coils. Work has started on demonstrating MgB2 wire in superconducting devices now that the wire is available commercially. MgB2 superconductors and coils have the potential to be integrated in a variety of commercial applications such as magnetic resonance imaging, fault current limiters, transformers, motors, generators, adiabatic demagnetization refrigerators, magnetic separation, magnetic levitation, energy storage, and high energy physics applications. This paper discusses the progress on MgB2 conductor and coil development in the last several years at Hyper Tech Research, Inc.read more
Citations
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Journal ArticleDOI
Two-band superconductor magnesium diboride
TL;DR: In this paper, the authors focus on the most important features of the 40 K superconductor MgB2, including the weakly interacting multiple bands (the σ and π bands) and the distinct multiple superconducting energy gaps.
Journal ArticleDOI
Ultrahigh current-carrying capability in clean MgB2 films
TL;DR: In this article, the authors studied the current carrying capability of high quality epitaxial MgB2 films synthesized using the hybrid physical-chemical vapor deposition technique by both transport measurement in nanobridge constrictions and magnetization measurement.
Journal ArticleDOI
Critical current densities and n-values of MgB 2 strands over a wide range of temperatures and fields
TL;DR: In this article, critical current densities, Jct, and n-values were extracted from transport measurements and were found to be universally related (for all B and T) according to in which mÕ = 0.52Õ± 0.11, with a T-dependent p in the range of about 0.08-0.21.
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Strong enhancement of high-field critical current properties and irreversibility field of MgB2 superconducting wires by coronene active carbon source addition via the new B powder carbon-coating method
TL;DR: In this article, an effective carbon-containing additive, coronene (C24H12), was used to fabricate MgB2 wires using the powder-in-tube (PIT) and internal Mg diffusion (IMD) processes.
Journal ArticleDOI
Enhanced critical fields and superconducting properties of pre-doped B powder-type MgB2 strands
Michael A. Susner,Y. Yang,M.D. Sumption,E.W. Collings,M A Rindfleisch,M.J. Tomsic,J. V. Marzik +6 more
TL;DR: In this paper, powders containing varying amounts of C were used to produce in-situ MgB2 strands which showed high values of Bc2, Birr and transport Jc (104.A cm − 2 at 13.3 T).
References
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Journal ArticleDOI
Superconducting properties of MgB2 tapes and wires
TL;DR: In this paper, the effect of the initial MgB2 particle size on the performance of the powder-in-tube (PIT) process was investigated and it was shown that a critical amount of impurities introduced during the particle reduction process is responsible for the observed maximum of Jc and Birr.
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Upper critical fields of powder-in-tube-processed MgB2/Fe tape conductors
TL;DR: In this paper, the authors measured the upper critical field of pure and SiC-added MgB2/Fe/Fe tapes prepared by the powder-in-tube process.
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Large upper critical field and irreversibility field in MgB2 wires with SiC additions
M.D. Sumption,M. Bhatia,M A Rindfleisch,M.J. Tomsic,Saeid Soltanian,Shi Xue Dou,E.W. Collings +6 more
TL;DR: In this article, resistive transition measurements were reported for MgB2 strands with SiC dopants, and the average particle sizes were 200 nm, 30 nm, and 15 nm.
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Substitution-induced pinning in MgB2 superconductor doped with SiC nano-particles
TL;DR: In this paper, a combination of counter-balanced Si and C co-substitution for B, leading to a large number of intragranular dislocations and the dispersed nano-size impurities induced by the substitution.
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Substitution induced pinning in MgB_2 superconductor doped with SiC nano-particles
TL;DR: By doping MgB_2 superconductor with SiC nano-particles, the authors successfully introduced pinning sites directly into the crystal lattice of Mb_2 grains (intra-grain pinning).