What is Proxima building?
Proxima Fusion is developing the technologies and industrial capabilities needed to put stellarator fusion power plants on the grid.
Our quasi-isodynamic (QI) stellarators are designed so that toroidal plasma currents cancel out, enabling stable, continuous operation. Combined with high-temperature superconducting (HTS) magnets, they offer the clearest path to commercial fusion power.
Designing the (near) impossible
Stellarators were exceedingly difficult to design in the past, until the advent of supercomputing. Proxima uses simulation, AI and rapid prototyping to iterate towards integrated designs that address trade-offs across plasma physics, engineering, manufacturability and commercial viability.
Our simulation- and data-driven approach is the foundation for agentic engineering systems where AI drives the design loop, rather than simply assisting it – accelerating the path to putting fusion on the grid.
Shaping magnetic fields for fusion power
Conventional superconductors require near absolute zero temperatures, but higher-temperature superconductors (HTS) can reach higher temperatures, carry high current densities, and produce stronger magnetic fields, creating greater stellarator design freedom and enabling commercial viability.
Proxima and its partners are developing the complete magnet system, from cable and coil design to structural support, cryogenics, and testing. We are also expanding capacity for critical materials and processes required for future fusion devices across Europe.
SMC: The gateway to Alpha and Stellaris
The Stellarator Model Coil (SMC) is Proxima's demonstration HTS stellarator magnet, bringing together computational design, HTS technology, structural engineering, manufacturing, metrology and testing. SMC hardware is already being delivered and will retire key technical risks for stellarators.
Together with our partners, we are currently manufacturing SMC, the first of many stellarator magnets that we'll go on to build in our new magnet factory. Every magnet built and tested strengthens the wider program, generating evidence and manufacturing knowledge that carries forward into Alpha, Stellaris, and future machines.
From complex designs to repeatable hardware
Designing a stellarator is only part of the challenge. Its complex components must be manufactured to tight tolerances, measured, handled, and assembled into an integrated machine.
Proxima is developing the tooling, manufacturing processes, quality systems, facilities and assembly methods needed to build stellarator hardware repeatedly and at scale.
Each build generates evidence that improves the design and strengthens the industrial system required for Alpha and Stellaris.
These capabilities come together in Proxima's two defining programs
Alpha
Alpha is Proxima's demonstration stellarator in which new technologies, manufacturing capabilities, and industrial partnerships converge.
Stellaris
Stellaris is Proxima's concept for a first commercial fusion power plant. Its requirements set our goals, and shape the technologies and industrial capabilities we are developing today.