Design and Construction of the New 85T Duplex Magnet at NHMFL-Los Alamos

The National High Magnetic Field Laboratory's Pulsed Field Facility at Los Alamos National Laboratory develops and provides ultra-high pulsed magnetic fields for scientific research. The facility houses several types of non-destructive pulsed magnets which can deliver the peak fields ranging from 60 T to 100 T for users. Two flagship magnets are the 100-T Multi-shot (100TMS) pulsed magnet and the 60-T Long Pulsed (60TLP) magnet, and both magnets are primarily driven by the powerful 1.4 GW generator. These two flagship magnets have been offline since 2019 while the generator was disassembled for program specific rotor upgrade and maintenance. To partially fulfill the strong demand from users to access higher magnetic fields, a new capacitor driven magnet system, the 85-T duplex (85TD) magnet, was recently developed. The 85TD magnet cannot match the magnetic field amplitude of the signature 100TMS generator driven magnet but can deliver 20 Tesla higher than the peak field of the workhouse 65-T short-pulsed magnets. This article will report technical design, construction, and possible risks associated with operation of the 85TD magnet.