CFS Vertical Integration of HTS Magnets
Pacific Fusion
CFS’s magnet factory matters because in tokamak fusion, the magnet is the machine’s hardest part to source, test, and improve. CFS is not just buying coils from a supplier, it is building a core component that determines reactor size, field strength, and construction timing. That gives it tighter control over schedule and design than most fusion companies, while also creating a capability that can be reused across later plants and outside customers.
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CFS’s whole reactor design is built around high field HTS magnets using REBCO tape. Stronger magnets let a tokamak reach the same plasma performance in a smaller machine, which lowers the amount of steel, concrete, and other plant equipment needed around the core. CFS demonstrated a full scale 20 tesla magnet in 2021 and is now scaling production for SPARC and ARC.
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Very few private fusion companies own this layer of the stack. Tokamak Energy is one of the other notable HTS magnet specialists, and it has turned that capability into a separate magnet business, including a 2026 contract on the UK STEP program. That is the closest proof that magnet manufacturing can become its own strategic asset, not just an internal cost center.
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This also sharpens the contrast with Pacific Fusion and Helion. Pacific is pursuing pulsed inertial fusion, so magnets are not its central bottleneck. Helion uses pulsed field reversed configuration machines and direct electricity conversion, which changes the hardware stack entirely. CFS is therefore competing on a more established tokamak path, but one where owning magnet production can compress iteration cycles and de risk plant delivery.
The next phase is likely to turn magnet capability into market power. If CFS hits SPARC’s 2027 net energy target and moves ARC toward grid delivery, its in house magnet line could become the template for scaling repeated plants, faster customer commitments, and possibly magnet sales into adjacent fusion and industrial markets.