Flux Dynamics in Inhomogeneous Bulk Superconductor During Pulsed Field Magnetization

Shiraishi, R.; Ohsaki, Hiroyuki

doi:10.1109/tasc.2005.864280

Cited by 16 publications

(14 citation statements)

References 8 publications

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“…Inhomogeneities occur during the growth process of c-axis seeded, single grain (RE)BCO bulk superconductors, resulting in the formation of growth section regions (GSRs) and growth sector boundaries (GSBs), as shown in figure 2, with a higher J c for the GSBs in comparison with the GSRs [98,[109][110][111]. These play a significant role in the magnetization of these materials, particularly for the PFM technique, where they can affect the magnitude and shape of the trapped field and the maximum temperature rise, and different results are observed in comparison to FC and ZFC, particularly for lower applied fields [104].…”

Section: Inhomogeneities In (Re)bco Bulk Superconductorsmentioning

confidence: 99%

“…In general, and for most standard cases, the equation for J c is relatively easy to introduce into a model once the dependence on magnetic field, temperature and position is known [108]. The role of inhomogeneities in the PFM process has been analysed numerically in [90,98,99,114]. In [90], a model is presented based on the three-dimensional (3D) FEM H-formulation [75,77,90,115], but in principle, as described in Section 2.2, other formulations are interchangable.…”

Section: Inhomogeneities In (Re)bco Bulk Superconductorsmentioning

confidence: 99%

“…J c0 can be considered a constant value or as a temperature-dependent function J c0 (T) if thermal considerations are necessary. Equation ( 4) has been applied variously to bulk superconductors in [97][98][99][100][101][102]. The material-dependent constants can be estimated via the trapped field profile of the bulk (for example, [97]) or by measurements of the magnetic moment hysteresis (m-H) loops of sub-specimens taken from the bulk (for example, [16,103,49]) at different temperatures.…”

Section: Understanding Flux Dynamicsmentioning

confidence: 99%

See 2 more Smart Citations

Modelling of bulk superconductor magnetization

Ainslie

Fujishiro

2015

Supercond. Sci. Technol.

185

166

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This paper presents 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 MgB 2 materials. Such modelling is a powerful tool to understand the physical mechanisms of their magnetization, to assist in interpretation of experimental results, and to predict the performance of practical bulk superconductor-based devices, which is particularly important as many superconducting applications head towards the commercialisation stage of their development in the coming years. In addition to the analytical and numerical techniques currently used by researchers for modelling such materials, the commonly used practical techniques to magnetize bulk superconductors are summarised with a particular focus on pulsed field magnetization (PFM), which is promising as a compact, mobile and relatively inexpensive magnetizing technique. A number of numerical models developed to analyse the issues related to PFM and optimise the technique are described in detail, including understanding the dynamics of the magnetic flux penetration and the influence of material inhomogeneities, thermal properties, pulse duration, magnitude and shape, and the shape of the magnetization coil(s). The effect of externally applied magnetic fields in different configurations on the attenuation of the trapped field is also discussed. A number of novel and hybrid bulk superconductor structures are described, including improved thermal conductivity structures and ferromagnet-superconductor structures, which have been designed to overcome some of the issues related to bulk superconductors and their magnetization and enhance the intrinsic properties of bulk superconductors acting as trapped field magnets (TFMs). Finally, the use of hollow bulk cylinders/tubes for shielding is analysed.

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Section: Inhomogeneities In (Re)bco Bulk Superconductorsmentioning

confidence: 99%

Section: Inhomogeneities In (Re)bco Bulk Superconductorsmentioning

confidence: 99%

Section: Understanding Flux Dynamicsmentioning

confidence: 99%

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Modelling of bulk superconductor magnetization

Ainslie

Fujishiro

2015

Supercond. Sci. Technol.

185

166

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“…The electric field involved when measuring the commonly used E-J power law is usually around 10 -6 V cm -1 at J c [10], and a typical power law of J 20 would imply a resistivity that is many orders of magnitude larger than the normal state resistivity which must be an upper limit. Thus the electric field generated in a PFM process is in a completely different regime from that in an E-J characterisation, which is beyond any reliable experimental results that are currently available.…”

Section: Methodsmentioning

confidence: 99%

Theoretical simulation studies of pulsed field magnetisation of (RE)BCO bulk superconductors

Lewin

Campbell

et al. 2010

J. Phys.: Conf. Ser.

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“…Numerical simulations were also carried out to study the electromagnetic properties in an inhomogeneous bulk. Ohsaki et al investigated the magnetic flux motion in bulk superconductor during PFM using the given angled or cos curve model [21,22]. To understand the magnetic flux dynamics mechanism and temperature rise in the bulk superconductor, the simulation was performed by assuming that the critical current density in the GSBs was four times higher than that in the GSRs [23].…”

Section: Introductionmentioning

confidence: 99%

Analysis of mechanical behavior in inhomogeneous high-temperature superconductors under pulsed field magnetization

Yong

Zhou

2020

Supercond. Sci. Technol.

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Melt-textured large, single-grain REBCO (RE: rare earth element or Y) bulk superconductors have growth sector boundaries (GSBs) and growth sector regions (GSRs). The critical current density is dependent on the GSBs and the GSRs, which will influence the electromagnetic field and the temperature field distributions. REBCO bulk superconductors are brittle materials and during the manufacturing process, cracks and inclusions may exist, therefore it is necessary to analyze the mechanical response during the magnetization process. In this paper, the mechanical response of an inhomogeneous cylinder superconductor under electromagnetic stress and the thermal stress during the pulsed field magnetization process is studied. By solving the coupled magnetic and heat diffusion equations in association with a modified E − J power-law relationship, we can obtain the electromagnetic field and the temperature field distributions; then, the mechanical response of the bulk can be determined. The trend shown by our numerical simulation is consistent with the experimental results. Then we study the mechanical behavior of inhomogeneous high-temperature superconductors with and without a flux jump. The case without or with the SUS 304 ring is also analyzed.

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Flux Dynamics in Inhomogeneous Bulk Superconductor During Pulsed Field Magnetization

Cited by 16 publications

References 8 publications

Modelling of bulk superconductor magnetization

Modelling of bulk superconductor magnetization

Theoretical simulation studies of pulsed field magnetisation of (RE)BCO bulk superconductors

Analysis of mechanical behavior in inhomogeneous high-temperature superconductors under pulsed field magnetization

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