Design of a high-current ac downlink using Bi-based superconductors

B. L. Fisher, Michael T. Lanagan, U. Balachandran, S. Honjo, T. Hara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Recent processing developments in Bi18Pb0.4Sr2Ca2Cu3O 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 =0.75 cm2 and carrying 250 A RMS transport current have AC loss values of 30 (oj/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 ≈200 mW of heat to the liquid-helium-cooled end. This paper will discuss 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.

Original languageEnglish (US)
Pages (from-to)711-714
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume7
Issue number2 PART 1
StatePublished - 1997

Fingerprint

Superconducting materials
high current
alternating current
Thermal gradients
temperature gradients
Helium
liquid helium
Thermal conductivity
thermal conductivity
prototypes
heat
cycles
Liquids
Processing
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Fisher, B. L., Lanagan, M. T., Balachandran, U., Honjo, S., & Hara, T. (1997). Design of a high-current ac downlink using Bi-based superconductors. IEEE Transactions on Applied Superconductivity, 7(2 PART 1), 711-714.
Fisher, B. L. ; Lanagan, Michael T. ; Balachandran, U. ; Honjo, S. ; Hara, T. / Design of a high-current ac downlink using Bi-based superconductors. In: IEEE Transactions on Applied Superconductivity. 1997 ; Vol. 7, No. 2 PART 1. pp. 711-714.
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Fisher, BL, Lanagan, MT, Balachandran, U, Honjo, S & Hara, T 1997, 'Design of a high-current ac downlink using Bi-based superconductors', IEEE Transactions on Applied Superconductivity, vol. 7, no. 2 PART 1, pp. 711-714.

Design of a high-current ac downlink using Bi-based superconductors. / Fisher, B. L.; Lanagan, Michael T.; Balachandran, U.; Honjo, S.; Hara, T.

In: IEEE Transactions on Applied Superconductivity, Vol. 7, No. 2 PART 1, 1997, p. 711-714.

Research output: Contribution to journalArticle

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AU - Balachandran, U.

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AU - Hara, T.

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