Electromagnetic and Stability Study on HTS/LTS Hybrid Superconducting Central Solenoid

Nb 3 Sn is considered to be one of the best candidate low-temperature superconducting (LTS) materials for the fusion superconducting magnet system. However, in consideration of the optimization design work of the fusion device magnet system, higher volts per second under a presupposition of a much more economical device size needs to be achieved. In our recent work, a type of high-temperature superconducting (HTS) and LTS hybrid magnet has been designed for the central solenoid for the fusion device. It can provide maximum volts per second of 220 V · s with the maximum magnetic field of 19.4 T. The inner HTS part of the magnet is designed with the Bi2212 conductor, whereas the outer LTS part is designed with the Nb 3 Sn conductor. It can meet the requirements of a high magnetic field and an operation current for fusion device. The structure design of the HTS/LTS hybrid magnet has been carried out. In addition, variation of the electromagnetic properties, according to the flexible structure design of HTS/LTS hybrid magnet and related stability analysis work, are also illustrated in this paper.