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The table turns slowly as strips of composite material are wound into a perfect ring. One hundred sixty-four turns later, the 3.4-tonne component, with an internal diameter of 5 metres, is ready for bonding, compression, curing, dry machining, inspection and testing.

These are ITER's pre-compression rings, a set of nine composite rings that will support the toroidal field magnet superstructure in the face of huge electromagnetic forces during operation. Encircling the tips of the coil structures at top and bottom, two sets of three rings will "push back" with a centripetal force of thousands of tonnes, suppressing any coil deflection and greatly reducing cyclic fatigue stresses.

The European Domestic Agency is working with principal contractor CNIM (Toulon, France) for the procurement of nine pre-compression rings (six, plus three spares). The raw material—pultrude laminate—is being procured by the European agency from the Finnish company Exel, while the equipment for last-phase testing was built under an ITER Organization contract awarded to Douce Hydro (France) in collaboration with CNIM. 

Production techniques and processes were validated during lengthy prototyping and qualification phases, and series production is underway now.

Visit the European Domestic Agency website to of the production process.  

In advance of the June G20 Summit in Osaka, Japan, Prime Minister Shinzo Abe and French President Emmanuel Macron held bilateral talks that resulted in the release of a five-year cooperation plan. Notably, ITER was one of the items on the agenda.

The plan provides a roadmap for partnership in the fields of maritime security, infrastructure development, global trade, space, cyberspace, cultural and scientific exchange, and the environment.

In Chapter IV (page 5-6), the two countries pledge to reinforce economic partnership with a particular emphasis on innovation—including ways of transitioning to energy systems that are low-carbon or carbon-neutral, affordable and stable. ITER makes that list, as well as the European-Japanese activities of the (advanced fusion energy research taking place in Japan).

Download the roadmap in  or