高熵合金凝固用高精度低温超导磁体的研制

FABRICATION OF A CONDUCTION COOLED SUPERCONDUCTING MAGNET FOR THE SOLIDIFICATION OF HIGH-ENTROPY ALLOYS

摘要: 根据高熵合金凝固用高精度低温超导磁体的技术要求，研制1套磁场可达10 T，室温直径为100 mm的高精度传导冷却超导磁体。该超导磁体由1组Nb₃Sn和4组NbTi线圈组成，同时设计并制造了直径650 mm、高612 mm的杜瓦。为降低磁体运行过程中漏热，采用1对150 A高温超导电流引线为磁体供电。磁体总质量388 kg，通过1台1.5 W@4.2 K的G-M制冷机作为冷源，经过62 h，将超导磁体冷却至2.92 K，磁体正常运行电流119.95 A，工作磁场10.001 T，励磁过程中未发生失超，运行稳定。同时，对强磁场下高熵合金的凝固进行实验研究，详细介绍了该超导磁体装置的设计、制造和测试过程。

Abstract: According to the technical requirements，a conduction cooled superconducting magnet with the center magnetic field of 10 T and room bore size of 100 mm was designed and fabricated.The magnet consists of 1 set of NbTi coil and 4 sets of Nb₃Sn coils accommodated by a cryostat with an outer diameter of 650 mm and height of 612 mm.The magnet system was cooled by a 1.5 W@4.2 K G-M cryocooler from room temperature to 2.92 K in 62 hours and the total weight of the system is 388 kg.The magnet was tested and reached the maximum operating current of 119.95 A，corresponding to a center magnetic field of 10.001 T without quenching.