# A trapped field of 17.6 T in melt-processed, bulk Gd-Ba-Cu-O reinforced with shrink-fit steel

Durrell, JH and Dennis, AR and Jaroszynski, J and Ainslie, MD and Palmer, KGB and Shi, Y-H and Campbell, AM and Hull, J and Strasik, M and Hellstrom, EE and Cardwell, DA (2014) A trapped field of 17.6 T in melt-processed, bulk Gd-Ba-Cu-O reinforced with shrink-fit steel. Superconductor Science and Technology, 27. 082001-. ISSN 0953-2048

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## Abstract

The ability of large grain, REBa$_{2}$Cu$_{3}$O$_{7-\delta}$ [(RE)BCO; RE = rare earth] bulk superconductors to trap magnetic field is determined by their critical current. With high trapped fields, however, bulk samples are subject to a relatively large Lorentz force, and their performance is limited primarily by their tensile strength. Consequently, sample reinforcement is the key to performance improvement in these technologically important materials. In this work, we report a trapped field of 17.6 T, the largest reported to date, in a stack of two, silver-doped GdBCO superconducting bulk samples, each of diameter 25 mm, fabricated by top-seeded melt growth (TSMG) and reinforced with shrink-fit stainless steel. This sample preparation technique has the advantage of being relatively straightforward and inexpensive to implement and offers the prospect of easy access to portable, high magnetic fields without any requirement for a sustaining current source.

Item Type: Article cond-mat.supr-con cond-mat.supr-con UNSPECIFIED Div C > Materials Engineering Cron Job 10 Jun 2014 15:45 19 Aug 2014 19:00