CUED Publications database

Pulsed field magnetization of 0°-0° and 45°-45° bridge-seeded Y-Ba-Cu-O bulk superconductors

Ainslie, MD and Zou, J and Mochizuki, H and Fujishiro, H and Shi, YH and Dennis, AR and Cardwell, DA (2015) Pulsed field magnetization of 0°-0° and 45°-45° bridge-seeded Y-Ba-Cu-O bulk superconductors. Superconductor Science and Technology, 28. ISSN 0953-2048

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Large, single-grain (RE)BCO (where RE = rare earth or Y) bulk superconductors with complicated geometries are required for a variety of potential applications, such as rotating machines, magnetic bearings and magnetic separation. As a consequence, the top multi-seeded melt growth process has been studied over many years in an attempt to deliver large, single grains for practical applications. Among these techniques, the so-called bridge-seeding produces the best alignment of two seeds during melt processing of multi-seed samples. In this paper, the trapped field performance and magnetic flux dynamics of two bridge-seeded, multi-seed samples magnetized by pulsed field magnetization are analyzed: one with a 45°-45° and another with a 0°-0° bridge seed. Based on an analysis of the flux penetration across the seeds and in-between the seeds of the 45°-45° multi-seed sample, an estimated J c distribution over the ab-plane is determined, which provides the basis for further analysis via numerical simulation. A three-dimensional finite-element model, developed to qualitatively reproduce and interpret the experimental results, was employed to investigate the influence of the length of the bridge seed for such multi-seed samples. The simulation results agree well with the observed experimental results, in that the multi-seed sample's particular inhomogeneous J c distribution acts to distort the trapped field profile from a traditional conical Bean's profile, which is determined by the length and direction of the bridge seed on the bulk surface.

Item Type: Article
Divisions: Div C > Materials Engineering
Depositing User: Unnamed user with email
Date Deposited: 17 Jul 2017 19:11
Last Modified: 09 Sep 2021 02:26
DOI: 10.1088/0953-2048/28/12/125002