AC Losses in MgB2 Wires and Tapes in Frequencies up to 18 kHz

Yasha Nikulshin; Shuki Wolfus; Vladimir Ginodman; Alex Friedman; Matteo Tropeano; Gianni Grasso; Yosef Yeshurun

doi:10.1109/tasc.2018.2791808

AC Losses in MgB₂ Wires and Tapes in Frequencies up to 18 kHz

Yasha Nikulshin
, Shuki Wolfus
, Vladimir Ginodman
, Alex Friedman
, Matteo Tropeano
, Gianni Grasso
, Yosef Yeshurun

Columbus Superconductors S.p.A.

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

4 Scopus citations

Abstract

We present a study of the ac losses in MgB₂ superconductors under operation mode typical of applications such as SMES and HVDC, utilizing large dc current superimposed with small, switching frequency ac current. The ac losses in two MgB₂ superconductors-a wire with 36 filaments in Monel sheath and a tape with titanium sheath-are compared in a wide range of ac amplitudes and frequencies up to 18 kHz, at different temperatures and dc current levels. Strong influence of the sheath material on the ac losses was found. The wire with Monel sheath shows a strong nonlinear contribution of the magnetic material to the losses. The losses reduce as the Monel approaches saturation at high dc current. In contrast, losses in the tape with Titanium sheath are practically independent of the dc level, and are smaller than losses in the Monel wire for the whole range of measured parameters. The results demonstrate the importance of further development of nonmagnetic low-loss MgB₂ wires and tapes for applications that involve exposure to ac ripple current in switching frequencies.

Original language	English
Article number	8201504
Journal	IEEE Transactions on Applied Superconductivity
Volume	28
Issue number	4
DOIs	https://doi.org/10.1109/tasc.2018.2791808
State	Published - Jun 2018

Bibliographical note

Publisher Copyright:
© 2002-2011 IEEE.

Funding

Manuscript received September 18, 2017; accepted December 14, 2017. Date of publication January 10, 2018; date of current version May 1, 2018. This work was supported by the Israeli Ministry of Science, Technology, and Space. (Corresponding author: Yasha Nikulshin.) Y. Nikulshin, S. Wolfus, V. Ginodman, A. Friedman, and Y. Yeshurun are with the Department of Physics, Institute of Superconductivity, Bar-Ilan University, Ramat Gan 5290002, Israel (e-mail: [email protected]). M. Tropeano and G. Grasso are with Columbus Superconductors SpA, Genova 16133, Italy. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2018.2791808

Funders
Israeli Ministry of Science, Technology, and Space

Keywords

AC loss
MgB2
SMES superconducting magnet energy storage

Access to Document

10.1109/tasc.2018.2791808

Cite this

@article{8da621335f2847b49a8924c0acdbfe06,

title = "AC Losses in MgB2 Wires and Tapes in Frequencies up to 18 kHz",

abstract = "We present a study of the ac losses in MgB2 superconductors under operation mode typical of applications such as SMES and HVDC, utilizing large dc current superimposed with small, switching frequency ac current. The ac losses in two MgB2 superconductors-a wire with 36 filaments in Monel sheath and a tape with titanium sheath-are compared in a wide range of ac amplitudes and frequencies up to 18 kHz, at different temperatures and dc current levels. Strong influence of the sheath material on the ac losses was found. The wire with Monel sheath shows a strong nonlinear contribution of the magnetic material to the losses. The losses reduce as the Monel approaches saturation at high dc current. In contrast, losses in the tape with Titanium sheath are practically independent of the dc level, and are smaller than losses in the Monel wire for the whole range of measured parameters. The results demonstrate the importance of further development of nonmagnetic low-loss MgB2 wires and tapes for applications that involve exposure to ac ripple current in switching frequencies.",

keywords = "AC loss, MgB2, SMES superconducting magnet energy storage",

author = "Yasha Nikulshin and Shuki Wolfus and Vladimir Ginodman and Alex Friedman and Matteo Tropeano and Gianni Grasso and Yosef Yeshurun",

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

year = "2018",

month = jun,

doi = "10.1109/tasc.2018.2791808",

language = "אנגלית",

volume = "28",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "4",

}

TY - JOUR

T1 - AC Losses in MgB2 Wires and Tapes in Frequencies up to 18 kHz

AU - Nikulshin, Yasha

AU - Wolfus, Shuki

AU - Ginodman, Vladimir

AU - Friedman, Alex

AU - Tropeano, Matteo

AU - Grasso, Gianni

AU - Yeshurun, Yosef

PY - 2018/6

Y1 - 2018/6

N2 - We present a study of the ac losses in MgB2 superconductors under operation mode typical of applications such as SMES and HVDC, utilizing large dc current superimposed with small, switching frequency ac current. The ac losses in two MgB2 superconductors-a wire with 36 filaments in Monel sheath and a tape with titanium sheath-are compared in a wide range of ac amplitudes and frequencies up to 18 kHz, at different temperatures and dc current levels. Strong influence of the sheath material on the ac losses was found. The wire with Monel sheath shows a strong nonlinear contribution of the magnetic material to the losses. The losses reduce as the Monel approaches saturation at high dc current. In contrast, losses in the tape with Titanium sheath are practically independent of the dc level, and are smaller than losses in the Monel wire for the whole range of measured parameters. The results demonstrate the importance of further development of nonmagnetic low-loss MgB2 wires and tapes for applications that involve exposure to ac ripple current in switching frequencies.

AB - We present a study of the ac losses in MgB2 superconductors under operation mode typical of applications such as SMES and HVDC, utilizing large dc current superimposed with small, switching frequency ac current. The ac losses in two MgB2 superconductors-a wire with 36 filaments in Monel sheath and a tape with titanium sheath-are compared in a wide range of ac amplitudes and frequencies up to 18 kHz, at different temperatures and dc current levels. Strong influence of the sheath material on the ac losses was found. The wire with Monel sheath shows a strong nonlinear contribution of the magnetic material to the losses. The losses reduce as the Monel approaches saturation at high dc current. In contrast, losses in the tape with Titanium sheath are practically independent of the dc level, and are smaller than losses in the Monel wire for the whole range of measured parameters. The results demonstrate the importance of further development of nonmagnetic low-loss MgB2 wires and tapes for applications that involve exposure to ac ripple current in switching frequencies.

KW - AC loss

KW - MgB2

KW - SMES superconducting magnet energy storage

UR - https://www.scopus.com/pages/publications/85041196474

U2 - 10.1109/tasc.2018.2791808

DO - 10.1109/tasc.2018.2791808

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85041196474

SN - 1051-8223

VL - 28

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 4

M1 - 8201504

ER -