Abstract
An engineering-feasible design and fabrication procedure for REB2aCu3O7-x (REBCO) magnets based on the strong Ic angle dependence at moderate temperatures (40–77 K) was developed. In this procedure, the Ic value of every REBCO coil of the magnet is calculated from the Ic (B,θ) data of REBCO tape at operating temperature with different applied fields, which is called the “full field-angle dependent Ic method.” This approach has significantly higher accuracy than the conventional method, which only focuses on the Ic value at the coil with the highest perpendicular field component. Additionally, the fitted lift factor at 45 K with different applied fields was closely related to the minimum Ic value at 77 K and 0.5 T. The engineering-feasible design and fabrication procedure for the REBCO magnet was developed on the basis of the Ic values calculated via the “full field-angle dependent Ic method” and lifting-factor fitted method, and it had a design error of <5%. The proposed technique is a more accurate method for the design and fabrication of cooling REBCO coils and will improve the applicability of REBCO magnets in this temperature range.
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