Controlled levitation of bulk superconductors

Ken Nagashima; Yukikazu Iwasa; Koichiro Sawa; Masato Murakami

doi:10.1109/77.892145

Controlled levitation of bulk superconductors

Ken Nagashima, Yukikazu Iwasa, Koichiro Sawa, Masato Murakami

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Levitation of bulk Y-Ba-Cu-O superconductors could successfully be controlled using a Bi-Sr-Ca-Cu-O superconducting electromagnet. It was found that stable levitation without tilting was obtained only when the sample trapped a certain amount of field, the minimum of which depended on the external field and the sample dimensions. We also employed the novel analysis method for levitation based on the total energy balance, which is much simpler than the force method and could be applied to the understanding of general levitation behavior. Numerical analyzes thus developed suggested that stable levitation of superconductors with large dimensions can only be achieved when the induced currents can flow with three dimensional freedom.

Original language	English
Pages (from-to)	1642-1648
Number of pages	7
Journal	IEEE Transactions on Applied Superconductivity
Volume	10
Issue number	3
DOIs	https://doi.org/10.1109/77.892145
Publication status	Published - 2000 Sept
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/77.892145

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title = "Controlled levitation of bulk superconductors",

abstract = "Levitation of bulk Y-Ba-Cu-O superconductors could successfully be controlled using a Bi-Sr-Ca-Cu-O superconducting electromagnet. It was found that stable levitation without tilting was obtained only when the sample trapped a certain amount of field, the minimum of which depended on the external field and the sample dimensions. We also employed the novel analysis method for levitation based on the total energy balance, which is much simpler than the force method and could be applied to the understanding of general levitation behavior. Numerical analyzes thus developed suggested that stable levitation of superconductors with large dimensions can only be achieved when the induced currents can flow with three dimensional freedom.",

author = "Ken Nagashima and Yukikazu Iwasa and Koichiro Sawa and Masato Murakami",

note = "Funding Information: Manuscript received December 10, 1999; revised August 29, 2000. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. The review of this paper was supervised by Editor J. Schwartz. K. Nagashima is with Railway Technical Research Institute, Kokubunji-shi, Tokyo 185-8540 Japan (e-mail: ken@rtri.or.jp). Y. Iwasa is with Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02193 USA. K. Sawa is with the Department of Electrical engineering, Keio University, Kohoku-ku, Yokohama 223-8522 Japan. M. Murakami is with Superconductivity Research Laboratory, Minato-ku, Tokyo 105-0023 Japan. Publisher Item Identifier S 1051-8223(00)11331-4. Copyright: Copyright 2007 Elsevier B.V., All rights reserved.",

year = "2000",

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AU - Sawa, Koichiro

AU - Murakami, Masato

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PY - 2000/9

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N2 - Levitation of bulk Y-Ba-Cu-O superconductors could successfully be controlled using a Bi-Sr-Ca-Cu-O superconducting electromagnet. It was found that stable levitation without tilting was obtained only when the sample trapped a certain amount of field, the minimum of which depended on the external field and the sample dimensions. We also employed the novel analysis method for levitation based on the total energy balance, which is much simpler than the force method and could be applied to the understanding of general levitation behavior. Numerical analyzes thus developed suggested that stable levitation of superconductors with large dimensions can only be achieved when the induced currents can flow with three dimensional freedom.

AB - Levitation of bulk Y-Ba-Cu-O superconductors could successfully be controlled using a Bi-Sr-Ca-Cu-O superconducting electromagnet. It was found that stable levitation without tilting was obtained only when the sample trapped a certain amount of field, the minimum of which depended on the external field and the sample dimensions. We also employed the novel analysis method for levitation based on the total energy balance, which is much simpler than the force method and could be applied to the understanding of general levitation behavior. Numerical analyzes thus developed suggested that stable levitation of superconductors with large dimensions can only be achieved when the induced currents can flow with three dimensional freedom.

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Controlled levitation of bulk superconductors

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