Material Requirements and Choices for Non-Destructive Pulsed Magnets

The Dresden High Magnetic Field Laboratory (HLD) is a pulsed-field user facility, which provides external and in-house researchers with the possibility to perform a broad range of experiments in pulsed magnetic fields [1]. Being a member of the European Magnetic Field Laboratory (EMFL), HLD provides access and supports more than 100 scientific projects annually. The HLD develops, manufactures, and operates the non-destructive pulsed magnets for the field range up to 95 T and beyond. The choice of materials in magnet design plays a crucial role.<br/><br/>Here I will discuss various issues of material requirements and the choice of materials for pulsed magnet designs. Most of the pulsed magnets are stress limited due to the strong Lorentz forces with a stress level of the materials very close to the ultimate tensile strength (UTS). Specifically, the conductors should possess a number of contradicting properties, such as high electrical conductivity, high UTS, high ductility, high specific heat, low fatigue, and low magnetoresistance. A very popular approach in the magnet design is a distributed internal reinforcement, which sustains the mechanical stresses inside the coil winding. Here the choice and combination of materials are very important as well. I will report on our long-standing experience with various materials for the pulsed-magnet designs. Obviously, we need novel high-strength materials to generate magnetic fields beyond 100 T with the non-destructive pulsed magnets.<br/><br/>I acknowledge the support of the HLD at HZDR, a member of the European Magnetic Field Laboratory (EMFL).<br/><br/>[1] http://www.hzdr.de/hld