Abstract
This paper studies the critical current of second generation, high temperature superconducting coils under an external magnetic field experimentally and numerically. Two identical coils with different coated conductors are fabricated and tested under a direct current (DC) magnetic field along the axis of the coil. Then, a numerical model in cylindrical coordinates based on a sheet current model is built by taking the measured magnetic field dependency to analyze the current distribution and magnetic field distribution. The simulated critical currents of the coils under the DC magnetic field have good agreement with the measured results. We find that under the in-phase field, the critical current decreases as the magnetic field in the innermost turn is enhanced by the external field. Meanwhile, the anti-phase external field increases the critical current a bit at first, then decreases the critical current. We further discuss the critical current criteria of the coils, showing that the parallel field plays a more important role in critical current determination.
Highlights
Second generation (2G), high-temperature superconductors (HTS), known as Rare EarthBarium Copper Oxide (REBCO) tapes, have high critical currents under external magnetic fields; pancake coils wound with Rare EarthBarium Copper Oxide (REBCO) are widely used as insert magnets for high magnetic field devices [1,2,3,4,5]
Barium Copper Oxide (REBCO) tapes, have high critical currents under external magnetic fields; pancake coils wound with REBCO are widely used as insert magnets for high magnetic field devices [1,2,3,4,5]
This paper aims to the critical current of 2G HTS coils under a direct current (DC) magnetic field parallel to the axis of the coil
Summary
Second generation (2G), high-temperature superconductors (HTS), known as Rare EarthBarium Copper Oxide (REBCO) tapes, have high critical currents under external magnetic fields; pancake coils wound with REBCO are widely used as insert magnets for high magnetic field devices [1,2,3,4,5]. For high-field applications, the critical current of REBCO coils is one of the key issues. Polak et al measured the magnetic field and alternating current (AC) loss of the REBCO coil [10]. Fukushima et al fabricated four Gadolinium Barium Copper Oxide (GdBCO) coils and measured the critical current in the self-field [11]. Their experiments showed that the critical current was determined by the magnetic field with 45◦ to the c-axis of the GdBCO layer in the middle of the coil edge.
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