Demonstration High Temperature Superconducting Non-Planar Stellarator Magnet with Advanced Manufactured Assemblies

Summary

This final report details a DOE ARPA-E funded project (September 2020 - March 2024) to develop a demonstration high-temperature superconducting (HTS) non-planar stellarator magnet using advanced manufacturing. The project aimed to address challenges in manufacturing complex 3D non-planar HTS magnets for fusion devices, targeting an engineering current density of 1.35 kA/cm2 at 77 K (5 kA in cable) and bend radii as tight as 10-cm. Two prototypes were fabricated: a 1.5m NOVEL cable with 100 REBCO tapes achieved 5.86 kA, and a 2.8m MINOAN coil with 30 REBCO tapes achieved 2.14 kA, both at 77 K, with critical current degradation kept below 15%. Advanced manufactured support plates showed 100% density and met dimensional accuracy targets, demonstrating the potential for over 50% reduction in cost and time, and over 75% waste reduction compared to conventional methods.

Key Facts

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