Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • A wide angle on progress

    Whether captured from the top of a crane or from a drone hovering at an altitude of a few dozen metres, the ITER site isalways spectacular. After almost seven y [...]

    Read more

  • Inside the arena

    A visit to the deep "well" where the ITER Tokamak assembly will begin next year begins with a journey underground ... through a maze of giant pillars, [...]

    Read more

  • 10,000 tonnes of magnets to cool

    In ITER, huge volumesof liquid helium will be circulated throughout a complex, five-kilometre network of pipes, pumps and valves to keep the 10,000-tonne magnet [...]

    Read more

  • Heaviest convoy yet

    The triple convoy that reached ITER on Thursday 13 April wasthe heaviest ever organized since the beginning of "highly exceptional" deliveries in Janu [...]

    Read more

  • Gouging the giant's eye

    On the side of the ITER bioshield that faces the main ITER office building, four large openings have been preserved to allow passage for the neutral beam inject [...]

    Read more

Of Interest

See archived articles

Successful machining trials for full-size radial plates

-Alessandro Bonito-Oliva, EU ITER TF Coils Responsible Officer

The side radial plate completed by CNIM in Toulon, France. Photo courtesy of CNIM. (Click to view larger version...)
The side radial plate completed by CNIM in Toulon, France. Photo courtesy of CNIM.
Good news for the toroidal field coil team at the European Domestic Energy Fusion for Energy (F4E): the two companies assigned to the manufacturing of the full-size radial plate prototypes, CNIM and SIMIC, have reported the successful completion of the machining for one side and one regular radial plate.

ITER Director-General Osamu Motojima (with Alessandro Bonito-Oliva to his right) inspecting the prototype at CNIM in Toulon. (Click to view larger version...)
ITER Director-General Osamu Motojima (with Alessandro Bonito-Oliva to his right) inspecting the prototype at CNIM in Toulon.
The radial plates that hold the conductor of the toroidal field coils are very complex 8.5 x 15 metre, D-shaped stainless steel structures with grooves machined on both sides along a spiral trajectory. Each toroidal field coil is composed of seven double pancake modules. Each double pancake is composed by a radial plate within whose grooves the insulated conductor is embedded. Each coil contains five regular radial plates (with 12 grooves per side) and two side radial plates (with respectively 9 and 3 groves on the two sides).

The side radial plate prototype was manufactured by CNIM based in Toulon, France utilizing seven stainless steel forged plates made of 316LN and butt welded with local vacuum electron beam technology. Each section is fully machined to the final tolerances except the welded areas.

The regular radial plate prototype completed by SIMIC in Camerana, Italy. Photo courtesy of SIMIC. (Click to view larger version...)
The regular radial plate prototype completed by SIMIC in Camerana, Italy. Photo courtesy of SIMIC.
The regular radial plate prototype was manufactured by SIMIC in Camerana, Italy utilizing 16 sections of hipped (hot isostatic pressure) 316LN stainless steel butt welded by narrow gap TIG. Each section was pre-machined before welding leaving extra material; the whole radial plate was then machined with a large portal machine, now belonging to F4E.

On both radial plates the required, and very demanding, tolerances were achieved. This success demonstrates the feasibility of the radial plate for the first time, and also qualifies two different technologies for manufacturing.

F4E is now preparing the launch of the tender procedure for the production of 70 radial plates needed to produce the 10 coils that represent the European share to the ITER toroidal field magnet system.

A special thanks goes to Eva Boter and Marc Cornelis for their big contribution to this "success story."


return to the latest published articles