Renaissance Fusion is advancing the development of a stellarator-based commercial nuclear fusion reactor by combining several key enabling technologies. At the core is a novel magnet system that employs wide, laser-engraved high-temperature superconductors (HTS) to generate complex three-dimensional stellarator magnetic fields.
We propose a simplified workflow in which the current distribution is solved and optimized on a cylindrical surface and laser engraved onto the conductor itself, shifting current complexity from 3D magnet geometry to 2D surface patterning.
To validate this approach, we are implementing a step-by-step deployment of the essential technologies, including the development of a complete production line for the fabrication of large-width superconducting REBCO tapes, laser engraving of superconducting materials, large Cryostation test bench and the manufacturing of large coils with complex electrical pathways designed to generate stellarator-type magnetic fields.
Before the realization of a fully HTS version, Ha proof-of-concept experiment is under construction to generate a stellarator-type magnetic field using coils composed of multiple layers of laser-patterned copper cooled with liquid nitrogen. The expected magnetic field deviation with respect to the target field will be presented, together with the iterative optimization process carried out to accommodate structural supports and vacuum vessel access ports.

Keywords
superconductor|Fusion|Magnet|HTS|REBCO