NDLI: The use of the Bi-2223 superconducting tubes

Content Provider	IEEE Xplore Digital Library
Author	Plechacek, V. Hejtmanek, J. Sima, V.
Copyright Year	2002
Abstract	The work is mainly devoted to the possibility of the use of the BPSCCO tubes as permanent superconducting magnets, i.e. to the increase of the critical current density J/sub c/ and the trapped magnetic flux density B/sub tr/. The obtained results are also applied for the superconducting current leads and fault current limiters. The Bi-2223 tubes were prepared by the isostatic pressing using a pressing mandrel and they were thermomechanically processed several times. It was shown that the texture formed during the process and favorably influencing J/sub c/ is more pronounced in tubes with thinner walls. With regard to this fact, a superconducting magnet composed of many thinner tubes was prepared. The trapped magnetic flux density in the hole of the magnet reached up to 0.5 T at 20 K and, after cooling the magnet at 15 K, the B/sub tr/ value of 0.5 T was maintained seemingly without relaxation for five days. This multi tubes magnet was also compared with one composed of two tubes of thicker walls. The J/sub c/ of about 1000 A/cm/sup 2/ (at 77 K and under self field of about 20 mT) achieved for the single tubes indicates an advantage of the use of relatively thin Bi-2223 tubes for the superconducting current leads and fault current limiters.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	703
Ending Page	706
Page Count	4
File Size	825602
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting magnets Magnetic flux Superconducting materials Fault current limiters Pressing Superconducting films Magnetic materials Shape Permanent magnets Heat treatment
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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