A Novel Pragmatic Magnetic Dam Structure for Ultra-high Field (>27 T) Superconducting Magnet

The magnetic dam (MD) is a promising passive protection method for high-temperature superconducting (HTS) magnets. Urgent problems remain to be resolved in order to put it into practice. This article deals with the deformation problem of the magnetic dam in the background magnet quench. A novel copper–steel composite structure was proposed, which could improve the MD’s mechanical properties. As a comparison criterion, the electromagnetic stress and deformation of the magnetic dam during the background field magnet quench are simulated and analyzed. The effect of different thicknesses of stainless steel on the strength and the protection performance of the magnetic dam is also discussed. The results revealed that the original copper magnetic dam does not possess sufficient strength to survive from the low-temperature superconducting (LTS) magnet quench in the HTS/LTS magnetic system. The composite structure is more apt to be used as a passive protection method for the insert HTS magnets.