Progress in the Development of a 25 T All Superconducting Magnet With Small-Scale YBCO Insert Coil

Abstract

The 25 T all superconducting magnet designed as a combination of 14 T low temperature superconductor (LTS) background field magnet and a 11 T YBCO insert coil has been developed at Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The prototype insert coil with no-insulation winding technique has the inner and outer diameters of 16 mm and 54 mm, respectively, and consists of ten single pancakes wound with about 220 m of YBCO conductors produced by Shanghai Superconducting Technologies Co., Ltd (SSTC). The preliminary tests were carried out at 77 K and 4.2 K. The test results show that the performance of coil did not degrade during the manufacturing and impregnation process, and it can generate a steady-state central magnetic field of 9.7 T in the 14.3 T background field, and 10.6 T in self-field. The detailed design, construction, and preliminary test results of the YBCO insert coil will be fully introduced in this paper.