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

B. L. Fisher; M. T. Lanagan; U. Balachandran; S. Honjo; T. Hara

doi:10.1109/77.614603

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

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

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2 Scopus citations

Abstract

Recent processing developments in Bi₁₈Pb_0.4Sr₂Ca₂Cu₃O _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 language	English (US)
Pages (from-to)	711-714
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	7
Issue number	2 PART 1
DOIs	https://doi.org/10.1109/77.614603
State	Published - 1997

All Science Journal Classification (ASJC) codes

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

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title = "Design of a high-current ac downlink using Bi-based superconductors",

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.",

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AU - Fisher, B. L.

AU - Lanagan, M. T.

AU - Balachandran, U.

AU - Honjo, S.

AU - Hara, T.

PY - 1997

Y1 - 1997

N2 - 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.

AB - 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.

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

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