Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • Fusion world | A helium campaign kicks off at JET

    After achieving record-breaking results on the Joint European Torus during 2021 experiments with the high-performance fuel mix of deuterium and tritium, EUROfus [...]

    Read more

  • Coil winding table | Seven years of faithful service

    In November 2015, workers from the European contractor Sea Alp Engineering, an Italian company based in Turin, began installing a large circular structure at th [...]

    Read more

  • Image of the week | Down under

    It has been close to five months since the first vacuum vessel module was installed in the Tokamak pit. The view from above is by now familiar: a huge D-sha [...]

    Read more

  • On site | An annual reminder about safety

    ITER's Safety and Quality Department knows: you can never repeat an important message often enough. The second annual ITER Safety Day took place on 15 Septe [...]

    Read more

  • Top management | ITER Council appoints new Director-General

    Convening in an extraordinary session in Paris, the ITER Council has appointed Pietro Barabaschi as the next Director-General of the ITER Organization. Mr Barab [...]

    Read more

Of Interest

See archived entries

Successful machining trials for full-size radial plates

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