Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • IAEA and ITER | Even closer cooperation

    Under Practical Arrangements signed in June, the International Atomic Energy Agency and the ITER Organization will be expanding and deepening a long history of [...]

    Read more

  • Neutral Beam Test Facility | High voltage component for MITICA

    Creating reliable high-energy neutral beams at ITER parameters, from a negative ion source, requires such a large technological leap that the components of the [...]

    Read more

  • 24th ITER Council | En route to First Plasma, 63% of the work is done

    The ITER Council has met for the twenty-fourth time since the signature of the ITER Agreement. Representatives from China, the European Union, India, Japan, Kor [...]

    Read more

  • Upper ports | A very international effort

    The 18 upper ports of the ITER vacuum vessel are procured by Russia, manufactured in Germany, and mounted (in part) on the vessel sectors by contractors in Ital [...]

    Read more

  • Paint job | One level done, five to go

    The job is done and the effect is spectacular. At the deepest basement level (B2) of the Tokamak Building, the floors, walls, and ceilings are now perfectly whi [...]

    Read more

Of Interest

See archived entries

Central solenoid

Elements of support cage arriving

US ITER

ITER's six-storey-tall central magnet will require a robust support structure to make sure that it remains secure and aligned in the face of the huge forces at play in the ITER machine. The very first element of the "caging" structure has been delivered by US ITER.

A ''caging'' structure formed by upper and lower key blocks and 18-metre-tall tie plates will ensure that the central solenoid withstands the tremendous forces of the ITER machine and remains aligned and secure. (Click to view larger version...)
A ''caging'' structure formed by upper and lower key blocks and 18-metre-tall tie plates will ensure that the central solenoid withstands the tremendous forces of the ITER machine and remains aligned and secure.
The ITER central solenoid is an 18-metre-tall column at the centre of the machine, formed from six independent magnet windings stacked within a pre-compression support structure.

The different support elements provide a secure base and cage that enables the assembly to withstand thousands of tonnes of force—both pre-load, when forces are applied to the structure to keep vertical gaps and stresses from developing between the modules, and during operation in the face of the machine's internal magnetic forces.

The first six-tonne key block has reached ITER. (Click to view larger version...)
The first six-tonne key block has reached ITER.
The compression structure also ensures that the tall magnet remains aligned and secure during intensive cycling with peak fields of over 13 Tesla. The support structures must endure high mechanical stresses in the ITER environment, and resist fatigue and crack growth from cycles at cryogenic temperatures.

The supportive "cage" is formed from components made from high-strength, superaustenitic stainless steel (Nitronic 50)—tie plates that run the full height of the central solenoid assembly (9 interior and 18 exterior), which connect at top and bottom to upper and lower "key blocks" weighing up to 6 tonnes each (see image). Procurement is proceeding well in the United States, coordinated by US ITER.

The first lower key block was delivered in February to the ITER site and eight more have been shipped; all 18 upper and lower key blocks will have reached ITER before the end of the year. The fabrication of the tie plates and other support structure components—such as load distribution plates and flex brackets—is underway.

Please see the original article on the US ITER website here.



return to the latest published articles