Referenced Items are not available for this document.
Recent processing developments in Bi/sub 1.8/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/. (BSCCO-2223) bars have produced bulk BSCCO-2223 bars with properties advantageous for power applications. Cold isostatically pressed (CIP) and sinter-forged BSCCO-2223 both have low AC loss, which make them desirable for use in power devices. Thermal conductivity of the CIP bars is lower than that of the previously used sinter-forged samples by a factor of 2. CIP bars with cross-sectional areas of /spl ap/0.75 cm/sup 2/ and carrying 250 A RMS transport current have AC loss values of 30 /spl mu/J/cycle-cm at 50 Hz and 77 K. A pair of prototype downlinks were designed and built with sinter forged bars to deliver a continuous AC current of 1500 A over a temperature gradient of 77 to 4.2 K while delivering about /spl ap/200 mW of heat to the liquid-helium-cooled end. This paper discusses the design considerations and modeling of downlinks, which supply high AC currents over the 77 to 4.2 K temperature gradient with low thermal losses.
Published in:
Applied Superconductivity, IEEE Transactions on
(Volume:7
,
Issue:
2
)
Date of Publication: June 1997
- Page(s):
- 711 - 714
- ISSN :
- 1051-8223
- INSPEC Accession Number:
- 5663316
- Digital Object Identifier :
- 10.1109/77.614603
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- June 1997
- Sponsored by :
- The IEEE Council on Superconductivity
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