AC loss and stability analysis in multifilamentary superconductors based on temporal evolution of current/temperature distribution
- Yokohama National Univ. (Japan)
Multifilamentary superconductors are often exposed to temporally changing external magnetic field whose magnitude and direction vary spatially in complicated magnet systems such as fusion devices or in multiply-twisted superconducting cables. Here, the temporal evolution of current and temperature distribution in multifilamentary superconductors was calculated numerically, while they are carrying the transport current and are exposed to spatially-distributed magnetic field. Thermomagnetic instabilities in superconductors operating at commercial frequency are initiated when their AC loss becomes maximum. When the external magnetic field is distributed axially, the radial current profile is also distributed axially. This leads to additional coupling loss. In steady state, the temperature rise due to losses is negligible. Quench process has been simulated dynamically, with the external magnetic field distributed axially. During the quench process, large temperature gradient along the conductor axis appears. The magnetic and thermal diffusions along the axis improve the stability limit against thermo-magnetic instabilities.
- OSTI ID:
- 287627
- Report Number(s):
- CONF-950691--
- Journal Information:
- IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt1 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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