Bruker and Luvata expand RRP superconductor supply for fusion

Category: Alloys, Blankets, Cryogenics, Magnetized, Magnets, Stellerator, Superconductors, Tokamak, Tritium

Cross-sections of niobium-tin superconducting wire strands, mounted alongside coiled RRP superconductor cable, showing the filament structure behind BEST and Luvata's fusion magnet supply.
Cross-sections of niobium-tin superconducting wire strands, mounted alongside coiled RRP superconductor cable, showing the filament structure behind BEST and Luvata's fusion magnet supply.

The honeycomb pattern in each cross-section is the filament structure that gives RRP wire its current-carrying capacity at up to 20 Tesla

(Image courtesy Luvata Materials & Solutions)

Bruker Energy & Supercon Technologies (BEST) and Luvata Materials & Solutions have agreed a strategic collaboration to scale up manufacturing of RRP superconducting wire, the niobium-tin conductor used in high-field tokamak and stellarator magnets. The companies frame the move as scaling for a coming generation of demonstration plants, a different scale to the research programmes RRP has supplied until now. BEST is also a founding shareholder in Gauss Fusion, the company the announcement names as evaluating RRP for its GIGA platform.

RRP superconductor supply meets a new scale of demand

RRP, the Rod-Restack Process, is what gives Nb3Sn wire the strength to sustain magnetic fields between 12 and 20 Tesla. It has already earned its place in demanding settings elsewhere, powering CERN’s Large Hadron Collider and ultra-high-field NMR magnets. Fusion is where BEST and Luvata’s own history with the technology runs deepest. Both companies point to prior work on ITER and the Wendelstein 7-X stellarator, with BEST’s Nb3Sn wire supplying both projects directly. It’s a track record built at the current scale of fusion research, the scale the two companies now say is about to change.

That shift is already visible in where demand is coming from. Fusion programmes across Europe, the US, China, Japan and South Korea are pushing toward next-generation demonstration plants, and all of them need reliable, industrial-scale superconductor supply to get there. Expanding capacity is BEST and Luvata’s answer, and their bet is that reliability, not just scale, is what wins fusion supply contracts going forward.

BEST’s stake in Gauss Fusion

Gauss Fusion’s own shareholder list includes Bruker EAS, BEST’s German operating entity, alongside RI Research Instruments, according to public reporting on the company’s ownership structure. The engineering case for RRP stands on its own regardless. Gauss Fusion’s published design work puts the maximum field on its GIGA magnet coils at 12 to 13 Tesla, comfortably inside the 12 to 20 Tesla range RRP is built for.

What broader RRP superconductor supply means for fusion procurement

Gauss Fusion’s position points to a wider shift already under way. As national fusion programmes move from research devices toward demonstration and first-of-a-kind plants, superconductor supply becomes a constraint developers can no longer plan around plasma physics alone. BEST and Luvata’s expansion suggests established Nb3Sn manufacturers are positioning for that shift now, ahead of the plants themselves being built. The closer question this deal raises is not whether RRP superconductor supply can scale, but which fusion developers already have an established relationship with their suppliers, and which are still building one.

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