Monel Contribution to AC Losses in MgB2 Wires in Frequencies Up to 18 kHz

Yasha Nikulshin; Shuki Wolfus; Alex Friedman; Vladmir Ginodman; Gianni Grasso; Matteo Tropeano; Gianmarco Bovone; Maurizio Vignolo; Carlo Ferdeghini; Yosef Yeshurun

doi:https://doi.org/10.1109/tasc.2018.2841926

Monel Contribution to AC Losses in MgB₂ Wires in Frequencies Up to 18 kHz

Yasha Nikulshin, Shuki Wolfus, Alex Friedman, Vladmir Ginodman, Gianni Grasso, Matteo Tropeano, Gianmarco Bovone, Maurizio Vignolo, Carlo Ferdeghini, Yosef Yeshurun

Bar-Ilan University

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

Abstract

AC losses for a wide range of ac amplitudes and frequencies have been studied in magnesium diboride (MgB₂ ) superconducting wire with 36 filaments and Monel sheath at different temperatures and dc current levels. The results show a strong nonlinear frequency dependence below 1 kHz, which crosses over to a more moderate linear behavior at frequencies up to 18 kHz. Surprisingly, the introduction of dc current causes a significant reduction in the ac losses. Finite element simulations yield ac losses consistent with that observed experimentally. The simulations show that the magnetic Monel sheath is a dominant source for ac losses in zero dc current and that nonzero dc current saturates the magnetization, thus reducing the ac losses.

Original language	English
Article number	6200906
Journal	IEEE Transactions on Applied Superconductivity
Volume	28
Issue number	8
DOIs	https://doi.org/10.1109/tasc.2018.2841926
State	Published - Dec 2018

Keywords

AC losses
finite element method (FEM)
magnesium diboride (MgB2 )
superconducting filaments and wires
superconducting magnetic energy storage (SMES)

All Science Journal Classification (ASJC) codes

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

Access to Document

https://doi.org/10.1109/tasc.2018.2841926

Cite this

@article{c910742ef2e641ea90ffb36ec1e84a2b,

title = "Monel Contribution to AC Losses in MgB2 Wires in Frequencies Up to 18 kHz",

abstract = "AC losses for a wide range of ac amplitudes and frequencies have been studied in magnesium diboride (MgB2 ) superconducting wire with 36 filaments and Monel sheath at different temperatures and dc current levels. The results show a strong nonlinear frequency dependence below 1 kHz, which crosses over to a more moderate linear behavior at frequencies up to 18 kHz. Surprisingly, the introduction of dc current causes a significant reduction in the ac losses. Finite element simulations yield ac losses consistent with that observed experimentally. The simulations show that the magnetic Monel sheath is a dominant source for ac losses in zero dc current and that nonzero dc current saturates the magnetization, thus reducing the ac losses.",

keywords = "AC losses, finite element method (FEM), magnesium diboride (MgB2 ), superconducting filaments and wires, superconducting magnetic energy storage (SMES)",

author = "Yasha Nikulshin and Shuki Wolfus and Alex Friedman and Vladmir Ginodman and Gianni Grasso and Matteo Tropeano and Gianmarco Bovone and Maurizio Vignolo and Carlo Ferdeghini and Yosef Yeshurun",

note = "Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",

year = "2018",

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doi = "https://doi.org/10.1109/tasc.2018.2841926",

language = "الإنجليزيّة",

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journal = "IEEE Transactions on Applied Superconductivity",

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T1 - Monel Contribution to AC Losses in MgB2 Wires in Frequencies Up to 18 kHz

AU - Nikulshin, Yasha

AU - Wolfus, Shuki

AU - Friedman, Alex

AU - Ginodman, Vladmir

AU - Grasso, Gianni

AU - Tropeano, Matteo

AU - Bovone, Gianmarco

AU - Vignolo, Maurizio

AU - Ferdeghini, Carlo

AU - Yeshurun, Yosef

PY - 2018/12

Y1 - 2018/12

N2 - AC losses for a wide range of ac amplitudes and frequencies have been studied in magnesium diboride (MgB2 ) superconducting wire with 36 filaments and Monel sheath at different temperatures and dc current levels. The results show a strong nonlinear frequency dependence below 1 kHz, which crosses over to a more moderate linear behavior at frequencies up to 18 kHz. Surprisingly, the introduction of dc current causes a significant reduction in the ac losses. Finite element simulations yield ac losses consistent with that observed experimentally. The simulations show that the magnetic Monel sheath is a dominant source for ac losses in zero dc current and that nonzero dc current saturates the magnetization, thus reducing the ac losses.

AB - AC losses for a wide range of ac amplitudes and frequencies have been studied in magnesium diboride (MgB2 ) superconducting wire with 36 filaments and Monel sheath at different temperatures and dc current levels. The results show a strong nonlinear frequency dependence below 1 kHz, which crosses over to a more moderate linear behavior at frequencies up to 18 kHz. Surprisingly, the introduction of dc current causes a significant reduction in the ac losses. Finite element simulations yield ac losses consistent with that observed experimentally. The simulations show that the magnetic Monel sheath is a dominant source for ac losses in zero dc current and that nonzero dc current saturates the magnetization, thus reducing the ac losses.

KW - AC losses

KW - finite element method (FEM)

KW - magnesium diboride (MgB2 )

KW - superconducting filaments and wires

KW - superconducting magnetic energy storage (SMES)

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