Numerical Simulation of Pulsed Field Magnetization of Cryocooler-Cooled Bulk Superconductor

Ohsaki, Hiroyuki; Matsumura, Subaru; Kawamoto, Shinji; Shiraishi, R.

doi:10.1063/1.2908700

Cited by 3 publications

(3 citation statements)

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“…where α is the critical current density extrapolated to T = 0 K, T c ≈ 90-92 K in the case of a (RE)BCO bulk superconductor, and m = 1.5 [78,90,103,123] or 2 [124,125]. There are also examples where a linear J c (T) relationship is assumed ( [99,101] and see sections 3.3.1 and 4).…”

Section: Inhomogeneities In (Re)bco Bulk Superconductorsmentioning

confidence: 99%

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%

Modelling of bulk superconductor magnetization

Ainslie

Fujishiro

2015

Supercond. Sci. Technol.

185

166

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“…Physical phenomena during PFM are described using electromagnetic and thermal equations on the axisymmetric co-ordinate, which were obtained from [12]. Based on the setup around the bulk, the framework of the theoretical simulation was constructed.…”

Section: Theoretical Model and Simulationmentioning

confidence: 99%

“…Several studies of theoretical simulations for PFM have reported using a solenoid coil [10][11][12]. Experimental research has remained limited and has shown little progress in exploring the enhancement of the trapped field using PFM.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of magnetic flux trapping on superconducting bulk magnetized by pulsed field using a vortex-type coil

Fujishiro¹,

Naito²,

Oyama³

2011

Supercond. Sci. Technol.

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Numerical simulations of trapped field B z and temperature T have been performed for a cryo-cooled superconducting bulk disc after applying a magnetic pulse using a vortex-type coil. Results of the simulation qualitatively reproduced experimental results reported by Ida et al (2004 Physica C 412-414 638). Using the vortex-type coil, the magnetic flux does not intrude into the bulk from the periphery but intrudes from both surfaces of the bulk disc. The temperature rise was less than that obtained when using a conventional solenoid coil. The effect of the trapped field enhancement using a long pulse application is small, which suggests that down-sizing of the condenser bank used for the pulsed field magnetization is possible and that the use of the vortex-type coil is desirable for practical applications.

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Magnetization of Superconducting Bulks

Fujishiro¹

2011

TEION KOGAKU

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Synopsis:The applications of REBaCuO superconducting bulks (RE: rare earth element or Y) have been investigated recently because of the enhancement of the superconducting characteristics such as critical current density J c and the trapped field B T . A superconducting bulk can trap higher B T of over 17 T via conventional field-cooled magnetization (FCM) and B T =5.2 T via pulsed field magnetization (PFM), which has been intensively studied because a superconducting magnet is not used. This review article summarizes the magnetizing mechanism of the superconductors, the recent activities of PFM conducted experimentally and numerically, and the practical applications of several superconducting bulk magnet devices.Keywords: bulk superconductor, pulse field magnetizing, trapped field, heat generation, bulk magnet

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Numerical Simulation of Pulsed Field Magnetization of Cryocooler-Cooled Bulk Superconductor

Cited by 3 publications

References 0 publications

Modelling of bulk superconductor magnetization

Modelling of bulk superconductor magnetization

Mechanism of magnetic flux trapping on superconducting bulk magnetized by pulsed field using a vortex-type coil

Magnetization of Superconducting Bulks

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