Wendelstein 7-X stellarator research gets 10-year US-EU deal

The twisted doughnut geometry of the Wendelstein 7-X: superconducting magnet coils surround the plasma vessel of the stellarator designed to demonstrate net energy from plasma confinement

(Image courtesy of Princeton Plasma Physics Laboratory)

The U.S. Department of Energy and Germany’s Max Planck Institute for Plasma Physics have signed a 10-year project agreement to advance Wendelstein 7-X stellarator research, formalising a collaboration that spans equipment supply, personnel deployment, and scientific publications across one of the world’s most closely watched plasma confinement programs. The deal is also the first project established under a new model project framework between the United States and the European Commission, setting a standard for how the US and EU structure joint fusion research efforts going forward.

Wendelstein 7-X stellarator:plasma confinement at the program level

The Wendelstein 7-X, or W7-X, is designed to demonstrate that the stellarator concept can sustain the plasma confinement conditions needed to generate net energy. The device confines plasma – the fourth state of matter – in a twisted doughnut geometry, held in place by superconducting magnet coils. Since first plasma in December 2015, W7-X has produced a series of record-setting results and drawn equipment contributions, personnel, and published research from institutions worldwide, including the Princeton Plasma Physics Laboratory.

PPPL’s involvement runs across all three dimensions. Principal research physicist Novimir Pablant, who contributed to developing the new agreement, described the lab’s engagement as covering equipment, personnel, and publications – the full operational stack of a major collaborative experiment. The 10-year agreement was signed by Jean Paul Allain, director of the Office of Fusion at DOE, and Sibylle Günter, scientific director of IPP. Allain noted the US-IPP collaboration had already been productive for more than 20 years. Günter confirmed that DOE’s involvement had been a key factor in the major results W7-X has achieved since 2015.

A new framework for US-EU stellarator collaboration

The model project framework this agreement inaugurates matters as much for what comes next as for W7-X itself. It is designed to reduce the administrative burden of new partnerships, help program managers follow best practices, and make compliance review easier for oversight bodies. Pablant put it plainly: instead of rebuilding legal groundwork from scratch with each new collaboration, teams now have a consistent framework to work from. That will streamline how future fusion research projects between DOE and EU facilities are initiated and expanded.

Matthew Lanctot, DOE program manager for stellarators, and Peter Kurz of IPP played key roles in developing the agreement alongside Pablant.

Equipment access, expertise, and the public-private path

For private fusion developers, PPPL is positioning the W7-X model as a template for what industry partnerships with a major public-sector program can look like. The lab’s Fusion Research and Technology Hub is designed to give fusion companies access to experimental facilities and 75 years of accumulated scientific expertise without the capital cost of building dedicated infrastructure. Pablant described the working arrangements on W7-X as a strong example of what a successful public-private collaboration could look like, particularly where a major public-sector effort is already underway.

The framework now in place is designed to streamline how the US and EU grow joint fusion research – making this agreement a structural foundation as much as a scientific one.

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