Baghdadi, M., Ruiz, H.S. and Coombs, T.A. (2016) Properties of magnetized second generation superconductors in rotating machines: Critical rule of substrates in magnetization and demagnetization of HTS stacked tapes. Physical Review Applied. (Submitted)

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Abstract

The problem of demagnetization in superconducting bulks in practical applications has received considerable attention in recent years. Yet the redistribution of the current inside a superconducting bulk because of the crossed and rotating magnetic field is the biggest objection on the practicability of superconductors in rotating machines. Recently, the stacked tape configuration unveiled a great potential as an alternative to superconducting bulks. On the basis of the finite element analysis, a detailed assessment is carried out to ascertain how the physical geometry of a sample can not only enhance the initial magnetization, but also, more importantly, to lessen the demagnetization. It is proven that the trapped field is logarithmically proportional to the number of layers while its maximum occurs when aspect ratio, the ratio between the height and shorter dimension of the ab-plane in a stack, is close to one.

In addition to self-protective intrinsic nature of stacked tapes that is associated with the thickness of superconducting tapes, a state-of-the-art technique is introduced for further protection of tapes as opposed to crossed and rotating magnetic fields. This technique, which is based on the shielding characteristic of superconducting tape, becomes even more interesting when it is applied to superconducting bulks, where a striking reduction of the demagnetization is achieved.

Item Type:	Book
Uncontrolled Keywords:	Crossed field; Rotating magnetic field; Superconducting tapes
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	01 May 2018 13:02
URI:	http://gala.gre.ac.uk/id/eprint/15332

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