The brief
- ST40 reached 100 million °C in 2022, a record for a privately funded spherical tokamak.
- Building Demo4, a full set of HTS magnets in tokamak shape, to test fusion-level fields.
- Part of the US DOE Milestone-Based Fusion Development Program.
Programs
Tokamak Energy, two programs
Updated 14 Apr 2026ST40A compact spherical tokamak with copper magnets, used to study very hot plasmas in this shape.ProtoNextUpgrade programme with lithium-coated wallsUpdated 4 Dec 2024View program →Demo4A full set of high-temperature superconducting magnets arranged as a spherical tokamak, to test how they perform together at fusion-level fields.ProtoNextFull-system testingUpdated 14 Apr 2026View program →
Research · Proto · Pilot · Deploy · Scaling
Peers
Company & funding
- HQ
- GB
- Founded
- 2009