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: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

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

11 Scopus citations

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

Bibliographical note

Publisher Copyright:
© 2002-2011 IEEE.

Funding

Manuscript received April 19, 2017; revised February 26, 2018; accepted May 17, 2018. Date of publication May 31, 2018; date of current version July 17, 2018. The design and development of the experimental setup was supported by the Israel Ministry of National Infrastructures, Energy, and Water. The measurements of the Columbus wires have been performed in the framework of the Israeli-Italian Scientific and Technological Cooperation program supported by the Israel Ministry of Science Technology and Space, and the Italian Ministry of Foreign Affairs. The work of Y. Nikulshin was supported by a Ph.D. grant from the Ministry of Science Technology and Space, Israel. This paper was recommended by Associate Editor N. Amemiya. (Corresponding author: Yasha Nikulshin.) Y. Nikulshin, S. Wolfus, A. Friedman, V. Ginodman, and Y. Yeshurun are with the Institute of Superconductivity, Department of Physics, Bar-Ilan University, Ramat-Gan 5290002, Israel (e-mail:,[email protected]).

Funders	Funder number
Israel Ministry of National Infrastructures
Israel Ministry of Science Technology and Space
Ministry of Science Technology and Space, Israel
Ministry for Foreign Affairs

Keywords

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

Access to Document

10.1109/tasc.2018.2841926

Cite this

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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.",

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AU - Grasso, Gianni

AU - Tropeano, Matteo

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