Cryogen-Free 23 T Superconducting Magnet with a 7.5 T YBa_2Cu_3O_7 Insert Coil

摘要

In order to develop a cryogen-free high-field superconducting magnet generating over 20 T, a YBa_2Cu_O_7 (Y123)-coated conductor insert coil is used to enhance a cryogen-free 18T superconducting magnet. The Y123 tape does not require stainless steel reinforcement. The Y123 insert coil, which is almost the same size as the current Bi_2Sr_2Ca_2Cu_3O_(10) (Bi2223) insert coil, is designed to generate 7.5 T at 187 A. It is able to achieve this since without stainless steel reinforcement the number of turns can be greatly increased. A cryogen-free superconducting magnet can achieve a static magnetic field of 23 T, which is higher than that generated by practical superconducting magnets using liquid helium.