Effect of interfacial resistance on AC loss as a function of applied ac field in YBCO filamentary conductors

Robert C. Duckworth; Fredrick A. List; Yifei Zhang

doi:10.1109/TASC.2009.2018455

Effect of interfacial resistance on AC loss as a function of applied ac field in YBCO filamentary conductors

Robert C. Duckworth, Fredrick A. List, Yifei Zhang

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

While continuous stabilization in filamentary Y-Ba-Cu-O (YBCO) coated conductors can generate additional heating due to coupling loss, a balance between low ac loss and conductor stability can be found through the introduction of interfacial resistance between the stabilizer and the filaments. The impact of interfacial resistance with respect to ac loss as a function of field was studied for YBCO filaments with a continuous silver cap layer. Starting with uncoated YBCO filaments on standard Ion Beam Assisted Deposition (IBAD) templates, an interfacial resistance between filaments was introduced through the exposure of filaments to air at room temperature and followed by the deposition of a continuous, 3 μm thick silver cap layer. The interfacial resistance between silver and the YBCO was controlled by oxygen annealing at different temperatures between 200 °C and 450 ° C. Measurements of the ac loss as a function of applied perpendicular field and frequency and the interfacial resistance revealed a correlation between the coupling loss and the oxygen annealing temperature, where the coupling loss was lowest at an oxygen annealing temperature of 200 C.

Original language	English
Article number	4967857
Pages (from-to)	3327-3331
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	19
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2009.2018455
State	Published - Jun 2009

Funding

Manuscript received August 22, 2008. First published May 26, 2009; current version published July 15, 2009. This work was supported by the U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability, Superconductivity Program for Electric Power Systems under Contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
Oak Ridge National Laboratory

Keywords

AC loss
Conductor stability
Continuous stabilization
YBCO coated conductors

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10.1109/TASC.2009.2018455

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title = "Effect of interfacial resistance on AC loss as a function of applied ac field in YBCO filamentary conductors",

abstract = "While continuous stabilization in filamentary Y-Ba-Cu-O (YBCO) coated conductors can generate additional heating due to coupling loss, a balance between low ac loss and conductor stability can be found through the introduction of interfacial resistance between the stabilizer and the filaments. The impact of interfacial resistance with respect to ac loss as a function of field was studied for YBCO filaments with a continuous silver cap layer. Starting with uncoated YBCO filaments on standard Ion Beam Assisted Deposition (IBAD) templates, an interfacial resistance between filaments was introduced through the exposure of filaments to air at room temperature and followed by the deposition of a continuous, 3 μm thick silver cap layer. The interfacial resistance between silver and the YBCO was controlled by oxygen annealing at different temperatures between 200 °C and 450 ° C. Measurements of the ac loss as a function of applied perpendicular field and frequency and the interfacial resistance revealed a correlation between the coupling loss and the oxygen annealing temperature, where the coupling loss was lowest at an oxygen annealing temperature of 200 C.",

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AU - Duckworth, Robert C.

AU - List, Fredrick A.

AU - Zhang, Yifei

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N2 - While continuous stabilization in filamentary Y-Ba-Cu-O (YBCO) coated conductors can generate additional heating due to coupling loss, a balance between low ac loss and conductor stability can be found through the introduction of interfacial resistance between the stabilizer and the filaments. The impact of interfacial resistance with respect to ac loss as a function of field was studied for YBCO filaments with a continuous silver cap layer. Starting with uncoated YBCO filaments on standard Ion Beam Assisted Deposition (IBAD) templates, an interfacial resistance between filaments was introduced through the exposure of filaments to air at room temperature and followed by the deposition of a continuous, 3 μm thick silver cap layer. The interfacial resistance between silver and the YBCO was controlled by oxygen annealing at different temperatures between 200 °C and 450 ° C. Measurements of the ac loss as a function of applied perpendicular field and frequency and the interfacial resistance revealed a correlation between the coupling loss and the oxygen annealing temperature, where the coupling loss was lowest at an oxygen annealing temperature of 200 C.

AB - While continuous stabilization in filamentary Y-Ba-Cu-O (YBCO) coated conductors can generate additional heating due to coupling loss, a balance between low ac loss and conductor stability can be found through the introduction of interfacial resistance between the stabilizer and the filaments. The impact of interfacial resistance with respect to ac loss as a function of field was studied for YBCO filaments with a continuous silver cap layer. Starting with uncoated YBCO filaments on standard Ion Beam Assisted Deposition (IBAD) templates, an interfacial resistance between filaments was introduced through the exposure of filaments to air at room temperature and followed by the deposition of a continuous, 3 μm thick silver cap layer. The interfacial resistance between silver and the YBCO was controlled by oxygen annealing at different temperatures between 200 °C and 450 ° C. Measurements of the ac loss as a function of applied perpendicular field and frequency and the interfacial resistance revealed a correlation between the coupling loss and the oxygen annealing temperature, where the coupling loss was lowest at an oxygen annealing temperature of 200 C.

KW - AC loss

KW - Conductor stability

KW - Continuous stabilization

KW - YBCO coated conductors

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ER -

Effect of interfacial resistance on AC loss as a function of applied ac field in YBCO filamentary conductors

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