Journal ArticleDOI
High trapped fields in bulk MgB2 prepared by hot-pressing of ball-milled precursor powder
Günter Fuchs,Wolfgang Häßler,Konstantin Nenkov,J. Scheiter,O. Perner,A. Handstein,T. Kanai,Ludwig Schultz,Bernhard Holzapfel,Bernhard Holzapfel +9 more
TLDR
In this article, the authors investigated the temperature dependence of the trapped field for short MgB2 samples (height?1.6?mm), and achieved trapped fields of up to B0?=?3.2?T at 15?K.Abstract:
Bulk superconducting MgB2 samples, 20?mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped fields of B0?=?5.4?T were obtained at 12?K in one of the investigated trapped field magnets (height 8?mm) at the centre of the bulk surface. Investigating the temperature dependence of the trapped field for short MgB2 samples (height ?1.6?mm), trapped fields of up to B0?=?3.2?T at 15?K were achieved. These high trapped fields are related to extremely high critical current densities of up to 106?A?cm?2 at 15?K, indicating strong pinning due to nanocrystalline MgB2 grains. Expected trapped field data for long trapped field magnets prepared from the available MgB2 material are estimated.read more
Citations
More filters
Journal ArticleDOI
Modelling of bulk superconductor magnetization
TL;DR: In this paper, the authors present a topical review of the current state of the art in modelling the magnetization of bulk superconductors, including both (RE)BCO (where RE?=?rare earth or Y) and MgB2 materials.
Journal ArticleDOI
Bulk superconductors: a roadmap to applications
John H. Durrell,Mark D. Ainslie,Difan Zhou,Philippe Vanderbemden,Tom Bradshaw,Susannah Speller,Mykhaylo Filipenko,David A. Cardwell +7 more
TL;DR: Athanassopoulou et al. as discussed by the authors have expressed their thanks to the participants at the workshop and acknowledged financial support for the road-mapping exercise on which this work is based from the University of Cambridge EPSRC Impact Acceleration Account (EP/K503757/1).
Journal ArticleDOI
Permanent magnet with MgB2 bulk superconductor
TL;DR: In this article, the 40-K-class metallic HTS magnesium diboride (MgB2) permanent magnet was shown to be an excellent permanent magnet for high-field applications requiring a strong and stable magnetic field.
Journal ArticleDOI
Development in processing of MgB2 cryo-magnet superconductors
Jacques G. Noudem,Jacques G. Noudem,M. Aburras,P. Bernstein,Xavier Chaud,Miryala Muralidhar,Masato Murakami +6 more
TL;DR: In this paper, commercial MgB2 powders were sintered with an applied mechanical pressure, leading to Mg-B2 pellets with 99% relative density, and the critical current density was measured equal to 5.6 × 104 A/cm2 at 20
Journal ArticleDOI
Demonstration of an iron-pnictide bulk superconducting magnet capable of trapping over 1 T
Jeremy D Weiss,Akiyasu Yamamoto,Akiyasu Yamamoto,Akiyasu Yamamoto,Anatolii Polyanskii,R. B. Richardson,David C. Larbalestier,Eric E. Hellstrom +7 more
TL;DR: A trapped field of over 1 T at 5 K and 0.5 T at 20 K has been measured between a stack of magnetized cylinders of bulk polycrystalline Ba0.6K0.4Fe2As2 superconductors as mentioned in this paper.
References
More filters
Journal ArticleDOI
Kinetics and kinematics for translational motions in microgravity during parabolic flight.
TL;DR: The goal is to combine kinetic and kinematic data to examine translational motions during microgravity adaptations to encourage fine-control motions as these reduce the risk of injury and increase controllability.
Journal ArticleDOI
High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K
Masaru Tomita,Masato Murakami +1 more
TL;DR: A post-fabrication treatment is presented that improves the mechanical properties as well as thermal conductivity of a bulk Y-Ba-Cu-O magnet, thereby increasing its field-trapping capacity and thermal stability and internal mechanical strength.
Journal ArticleDOI
Magnetic properties and critical currents of MgB2
TL;DR: In this paper, a review of the superconducting properties of MgB2 that are relevant for power applications is presented, focusing on the reversible mixed state parameters, which define the limiting conditions for loss-free currents: the transition temperature, the upper critical field and the depairing current.
Journal ArticleDOI
Improved superconducting properties in nanocrystalline bulk MgB2
TL;DR: In this paper, high density nanocrystalline MgB2 bulk superconductors with distinctly improved pinning were prepared by mechanical alloying of Mg and B powders at ambient temperatures followed by hot pressing.
Journal ArticleDOI
Improved superconducting properties in nanocrystalline bulk MgB_2
TL;DR: In this article, high-density nanocrystalline MgB_2 bulk superconductors with improved pinning were obtained by mechanical alloying of Mg and B powders and hot compaction at ambient temperatures.