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

  • Cooling water system | The tanks within a tank

    Deep inside the bowels of the Tokamak Building, the entrance to one of most spectacular rooms of the whole installation resembles that of a broom cupboard. [...]

    Read more

  • ITER assembly | Last major assembly contract signed

    One year after finalizing two major machine assembly contracts, the ITER Organization has chosen the contractors who will carry out assembly and installation ac [...]

    Read more

  • ITER Science | The towering importance of data

    The most important product of ITER is data, which will be used to produce the information needed to build models for DEMO and commercial reactors—and much more. [...]

    Read more

  • Image of the week | In my arms!

    In late November, one part of the 'shell' that encloses every vacuum vessel sector—a right-hand outboard thermal shield panel—had been mounted on a giant pre-as [...]

    Read more

  • Brexit | The UK will remain part of ITER

    'It was a great Christmas present,' says Ian Chapman, head of the United Kingdom Atomic Energy Authority. Many in the ITER community would agree. The Brexit neg [...]

    Read more

Of Interest

See archived entries

Cryostat

Adjusting, welding, testing ...

The assembly of the ITER cryostat—the stainless steel "thermos" that insulates the ultra-cold superconducting magnets from the environment—is progressing in an on-site workshop under the responsibility of the Indian Domestic Agency. Indian procurement scope includes the fabrication, assembly, welding and testing of four major sections (the base, lower cylinder, upper cylinder and top lid) as well as the installation and welding of the entire structure in the machine assembly "pit." Main contractor Larsen & Toubro Heavy Engineering has been tasked by the Indian Domestic Agency with the manufacturing design, fabrication and assembly of the cryostat.

 (Click to view larger version...)
The base section of the cryostat resembles a soup plate, with a deep bottom, vertical walls and a wide rim. In the picture above, the vertical walls have been trial fitted between the bottom plate (where the person is standing) and the top rim (which begins above the gap) for inspection.

 (Click to view larger version...)
Following inspection, the wall segments were disassembled. Adjustments are being made as seen above with a high-performance plasma torch. Once reassembled and welded into place, the full cryostat base will weigh 1,250 tonnes—the heaviest single component to be lowered by the overhead cranes into the machine assembly well in the Tokamak Building.

 (Click to view larger version...)
The lower cylinder of the cryostat—30 metres in diameter, 490 tonnes—has been completely assembled. During the welding operations of the last months, approximately 200 metres of circular and vertical welds were carried out. When all activities on this cryostat section conclude, it will be moved from the Cryostat Workshop to a protected location on the platform to make room for the upper cylinder segments that will be arriving from India.

 (Click to view larger version...)
It took approximately four weeks to verify half of the vacuum welds of the lower cylinder. Different specific ultrasonic examination probes are being used by Larsen & Toubro specialists to cover various angles and depth ranges.


return to the latest published articles