Proxima Fusion

Proxima Fusion is a German private fusion company founded in 2023 in Munich, emerging as a spinoff from the Max Planck Institute for Plasma Physics (IPP), which operates the Wendelstein 7-X stellarator in Greifswald. The company aims to commercialize stellarator fusion technology, building on the breakthrough results achieved at Wendelstein 7-X.

The stellarator is a magnetic confinement fusion concept that differs from the tokamak in that the magnetic field is generated entirely by external coils, without requiring a plasma current. This makes stellarators inherently more stable than tokamaks (which are susceptible to disruptions) and allows for steady-state operation—a critical advantage for a power plant. However, stellarators are historically more difficult to design and build due to the complex three-dimensional geometry of the magnetic field and coils.

Wendelstein 7-X, the world's largest stellarator, has demonstrated that optimized stellarator designs can achieve the magnetic field quality and plasma confinement needed for fusion. W7-X achieved record plasma durations and validated the theoretical optimization methods used in its design. Proxima Fusion aims to take these results and scale them to a commercial power plant.

The company's approach involves using advanced computational optimization techniques to design stellarator configurations that achieve high plasma performance while maintaining the engineering feasibility of the coil systems. This builds directly on the optimization methodology developed at IPP for W7-X. Proxima Fusion's founding team includes researchers with deep expertise in stellarator physics and computational plasma design.

Proxima Fusion has attracted venture capital investment and is part of the wave of private fusion companies that have emerged in the 2020s. The company benefits from Germany's strong fusion research infrastructure, including IPP, the Karlsruhe Institute of Technology (KIT), and various university programs. The German government's 2024 fusion strategy provides a supportive policy framework for private fusion companies.

The stellarator approach pursued by Proxima Fusion is distinct from the tokamak approach used by most private fusion companies (Commonwealth Fusion Systems, Tokamak Energy, etc.) and from the inertial confinement approach used by Marvel Fusion and Focused Energy. If successful, stellarators could offer a more practical path to steady-state fusion power plants due to their inherent stability and lack of plasma current disruptions.