Abstract
Due to the low material cost, high critical transition temperature and high-current-carrying capacity, MgB2 round wire with twisted filaments has great potential for applications in engineering. Therefore, it is important to estimate their critical current for optimizing and realizing high-powered wire and cable. A 3-D model is presented to calculate the critical current of wire and cable with twisted filaments. The critical current is estimated based on the Biot-Savart law and self-consistent model. A comparison between 2-D and 3-D models is performed for the wire. We consider the effect of twist pitch on the critical current. Moreover, the critical current of 6-around-1 cable with different twist pitches is analyzed and discussed using the 3-D model. It can be found that twist pitch of filaments plays an important role on the critical current. The model and method may also be useful for other superconducting wires and cables.
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Acknowledgements
We acknowledge the supports from the National Natural Science Foundation of China (nos. 11472120 and 11421062), the National Key Project of Magneto-Constrained Fusion Energy Development Program (no. 2013GB110002), the New Century Excellent Talents in University of the Ministry of Education of China (NCET-13-0266), and the National Key Project of Scientific Instrument and Equipment Development (11327802).
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Liu, D., Yong, H. & Zhou, Y. A 3-D Numerical Model to Estimate the Critical Current in MgB2 Wire and Cable with Twisted Structure. J Supercond Nov Magn 30, 1757–1765 (2017). https://doi.org/10.1007/s10948-017-4017-5
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DOI: https://doi.org/10.1007/s10948-017-4017-5