Fast Current Discharging of High Temperature Superconductor Magnets for a Single Silicon Crystal Growth System by Self-Coupling Energy Absorption

This is the authors' abstract. We don't add key points for this paper.

A high temperature superconductor (HTS) magnet is an attractive solution for reducing energy consumption to generate a major-diameter, high-quality single silicon crystal. However, quench has been an urgent problem for the application of HTS coils. Rapidly discharging the current in the coil is a crucial part of quench protection. Previous studies have shown that the copper plates initially intended for support and cooling can accelerate the coil current discharging rate during fast energy extraction. However, it's unclear how the copper plates influence the discharging process of the large scale HTS magnet with a low magnetic field for a single silicon crystal growth system. This paper designs a HTS magnet for a single silicon crystal growth system and a detailed study of the electromagnetic thermal characteristics of the magnet coupled with copper plates and rings has been conducted through simulations. The results show that both the copper plates and the copper rings can absorb energy from the HTS coil through electromagnetic coupling and the copper plates perform better than the copper rings. The copper frame combined with the copper plates and rings shows the best performance in accelerating the current discharging rate as well as decreasing the hot spot temperature of the HTS coil. This copper frame is a promising structure for the quench protection of HTS magnets for a single silicon crystal growth system.