A magnet for semi-continuous fields up to 60 T

The University of Amsterdam has a semicontinuous magnet in operation, which can generate fields up to 40 T and keep these fields constant (within 1:10⁴) during 0.1 s for 40 T, and longer for lower fields. The authors discuss a project for the establishment of a 60-T 100-ms facility primarily based on the concept of the present 40 T 100-ms magnet with its controlled power supply, which makes, within certain limits, any desired field profile possible. A Cu-Be mantle with a core of pure Cu is the most-suitable candidate for the wire material of the 60 T coil. The power supply, rectifier, transformers, and thyristors needed are described. The prospects for the fulfilment of the design are briefly mentioned.