Tokamak Energy — Technical Profile & Analysis
Deep-dive assessment of the Spherical Tokamak architecture, fuel path, and market positioning.
Confinement & Reactor
Magnetic Confinement (Spherical Tokamak)
Fuel Strategy
Deuterium-Tritium
Engineering Moat
HTS REBCO Magnets
Commercial / Funding Profile
Private — Stage Undisclosed
Technology Assessment & Commercial Milestones
Spherical-tokamak pioneer that doubles as the UK's de facto HTS magnet supplier. Tested a 26.2 T HTS magnet at CERN — among the highest fields ever reached by an HTS demountable magnet.
Thesis: Spherical geometry yields the highest β (plasma pressure / magnetic pressure) of any tokamak. Combined with HTS, this enables a much smaller, cheaper compact plant.
Key engineering bottlenecks: Inboard centre-post neutron shielding (no room for thick blanket); Disruption mitigation in compact ST geometry.
Recent milestones: 2022 — ST40 reached 100M °C ion temperature; 2024 — 26.2 T HTS magnet test at CERN; 2025 — Named magnet systems partner for UK STEP.
Device pipeline: ST40 → ST80-HTS demonstrator.
Timeline: Demonstration plant ~2030; commercial 2030s.
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