Abstract
REBCO tapes, the so-called second-generation high temperature superconductor, have wide application prospects in electrical engineering and high field magnets because of their high critical current density and superior mechanical and electromagnetic properties. However, a screening current field (SCF) can be induced by the perpendicular component of the magnetic field if the tapes are in a variable magnetic field since the width of the commercial tape is generally more than 2 mm. As a result, the SCF results in an uneven spatial distribution of the magnetic field. In this paper, the SCFs of the quasi-isotropic strand and the directly stacked strand, made of the REBCO tapes, are calculated at 77 K under different orientations of a 300 mT external magnetic field. Then, the experiments are conducted under the same conditions as the simulation. The experimental results are in good agreement with the calculated results. The conclusions of this paper are helpful to understand the SCFs of two kinds of strands and useful in the design of high field magnets in the future.
Highlights
With the depletion of fossil energy, it has become urgent to develop renewable energy
Since the directly stacked strand (DSS) is composed of REBCO tapes in parallel, the magnitude of its screening current field (SCF) at each position on the circumference is almost zero when α is 0○ and does not change obviously with time
The cross section of the quasi-isotropic strand (Q-IS) is centrosymmetric, and their magnitude of SCF is equal at the points symmetric about the center point O, e.g., the magnitude of the SCF at B is equal to that at F
Summary
With the depletion of fossil energy, it has become urgent to develop renewable energy. Nuclear fusion energy has great development prospects due to its advantages of large energy release, abundant raw material reserves, and safe use. The tokamak device is a feasible nuclear fusion reactor, whose cablein-conduit conductor (CICC) is made of NbTi and Nb3Sn.. With the continuous development of high temperature superconducting technology, the REBCO tape has good current carrying capacity and high axial tensile resistance at low temperatures and in high fields and has better stability than low temperature superconductors. These excellent characteristics make it more and more advantageous in the design and manufacture of high field magnets Its temperature margin can reach 10○.4,5 These excellent characteristics make it more and more advantageous in the design and manufacture of high field magnets
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