Ag-sheathed Bi2Sr2CaCu2O8 square wire insulated with oxidized hastelloy fiber braid

K. Watanabe, G. Nishijima, S. Awaji, Y. Hikichi, T. Hasegawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Oxidized Hastelloy X (Hx) fiber braid has been demonstrated to work well as a good electric insulation of Ag-sheathed Bi2Sr2CaCu 2O8 (Ag/Bi2212) wires. In order to develop a wind-and-react processed Ag/Bi2212 superconducting magnet with a high coil current density, we fabricated a test coil employing 45 m long Ag/Bi2212 square shape wire with 50 μm Hx fiber braid. A test coil, whose size is 73 mm outer diameter, 64.5 mm inner diameter, and 74 mm coil winding height, consisted of 4 layers and 210 turns, and was heat-treated at around 890°C in oxygen gas. The critical current Ic of the test coil was 245 A at 4.2 K in a self-field, corresponding to a 67% value of the short sample Ic heat-treated at the same time for comparison. Coil inductance was calculated to be 1.9 mH, and as a result, the same inductance value was obtained in the test coil. It was found that a Hx cloth knitting method enables us to insulate sufficiently between wires in Ag/Bi2212 square shape wire.

Original languageEnglish
Title of host publicationAdvances in Cryogenic Engineering - Transactions of the InternationalCryogenic Materials Conference, ICMC, Vol. 54
Pages439-444
Number of pages6
DOIs
Publication statusPublished - 2008
Event2007 Cryogenic Engineering and International Cryogenic Materials Conferences, CEC-ICMC 2007 - Chattanooga, TN, United States
Duration: 2007 Jul 162007 Jul 20

Publication series

NameAIP Conference Proceedings
Volume986
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other2007 Cryogenic Engineering and International Cryogenic Materials Conferences, CEC-ICMC 2007
CountryUnited States
CityChattanooga, TN
Period07/7/1607/7/20

Keywords

  • BiSrCaCuO wire
  • Hastelloy X
  • electric insulation
  • wind-and-react process

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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