Monel Contribution to AC Losses in MgB2 Wires in Frequencies Up To 18 kHz
| Autor: | Vladmir Ginodman, Matteo Tropeano, Y. Nikulshin, Gianmarco Bovone, Shuki Wolfus, Carlo Ferdeghini, Maurizio Vignolo, Alex Friedman, Yosef Yeshurun, G. Grasso |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Range (particle radiation) Yield (engineering) Materials science Condensed matter physics Superconducting wire Monel engineering.material Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Magnetization Amplitude chemistry 0103 physical sciences engineering Magnesium diboride Electrical and Electronic Engineering 010306 general physics Frequency modulation |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-6 |
| ISSN: | 2378-7074 1051-8223 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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