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Description
A 25 T All YBCO superconducting magnet with a warm bore of 52mm is designed for high-frequency gyrotrons in Wuhan National High Magnetic Field Center (WHMFC). The designed peak-peak field inhomogeneity is 50 ppm within 10mm Diameter of Spherical Volume (DSV). The magnet includes Inner, middle and Outer Coils which consists of 34, 56 and 68 double pancakes (DP) wound by bare YBCO tape, respectively. The first part of this paper presents an in-house superconducting magnet optimization code to obtain optimal electromagnetic design with integer numbers of layer and turn. The constraints such as central magnetic field, inhomogeneity, stray field, dimension and critical current characteristics are considered. The second part of this paper presents the stress analysis. The contact status within the magnet and effects of winding tension and over-banding are studied. The third part of this paper presents AC loss calculation model which includes magnetization loss, turn-turn loss and eddy current loss, which results in helium boil-off.
