Subscribe options

Select your newsletters:

Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Component delivery| A jewel in a box

    Sailing under the flag of Germany, the Regine is a mighty ship, strengthened for heavy cargo and equipped on its portside with two 750-tonne on-board cranes. Ha [...]

    Read more

  • Education | Make your own tokamak with 3D printing!

    It's not Lego, but it is definitely 'hands-on.' To offer a tangible device to illustrate the workings of magnetic confinement fusion in a tokamak, the ITER Orga [...]

    Read more

  • Worksite | Europe's Fusion for Energy is building the ITER installation

    Anyone driving to ITER can take full measure of the enormity of the project a few kilometers before reaching the destination. Gigantic cranes can be seen from a [...]

    Read more

  • Disruption mitigation | Experts in plasma disruptions gather online

    On 20-23 July, 120 international experts participated in the 1st IAEA Technical Meeting on Plasma Disruptions and their Mitigation, jointly organized by the Int [...]

    Read more

  • Start of assembly | World dignitaries celebrate a collaborative achievement

    Due to the constraints imposed by the COVID-19 pandemic, the crowd in the ITER Assembly Hall was small. But thanks to live broadcasting and video feed, the audi [...]

    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