Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • ITER DNA | A "case" study...

    In December last year, and again this year in early May, pre-welding fitting tests demonstrated that steel components as tall as a four-storey building (and wei [...]

    Read more

  • First plasma| Temporary in-vessel protection

    The vacuum vessel, the operating theatre of the ITER machine, needs to be protected against possible damage from the hot plasma at any given time during its ope [...]

    Read more

  • Divertor cassettes | Successful prototypes open way to series

    Before embarking on the fabrication of the 54 complex steel structures that will form a ring at the bottom of the ITER machine—the divertor cassettes—the Europe [...]

    Read more

  • Images of the week | Titan tool 90 percent complete

    Towering 22 metres above ground and weighing approximately 800 tonnes, the twin sector sub-assembly tools (SSAT) are formidable handling machines that will be u [...]

    Read more

  • Video | How does the ITER cryoplant work?

    Cold is essential to ITER—10,000 tonnes of superconducting magnets, the thermal shield that surrounds the machine, the cryopumps that achieve the high vacuum in [...]

    Read more

Of Interest

See archived articles

Cryostat welding begins

R.A.

A few weeks ago, the six tier 1 segments of the cryostat base were positioned on an assembly frame in the Cryostat Workshop and readied for welding operations. Using optical metrology, the 50-tonne elements were carefully aligned like so many slices of a giant steel pie, each separated from the next by a 4 millimetre gap to be filled by welding.

The welding of such a giant component is an impressive sight indeed. Welders, crouching or lying, look positively small on the polished steel surfaces of the segments. (Click to view larger version...)
The welding of such a giant component is an impressive sight indeed. Welders, crouching or lying, look positively small on the polished steel surfaces of the segments.
Before the welders could step on the circular stage, however, one last preparatory step needed to be performed: the "coconut ceremony" which, in the Indian tradition, accompanies important occasions and new starts such as a wedding, a journey or ... a construction project.

On Thursday 8 September, when the last of the coconuts had been broken and shared between all participants, the first welding operations for the ITER cryostat could get off to a start.

Welders work in perfectly coordinated pairs—one operating from on top of the 50-millimetre-thick steel plate and the other, invisible, from underneath.<br /><br /> (Click to view larger version...)
Welders work in perfectly coordinated pairs—one operating from on top of the 50-millimetre-thick steel plate and the other, invisible, from underneath.

The welding of such a giant component is an impressive sight indeed. Welders, crouching or lying, look positively small on the polished steel surfaces of the segments. With protective masks that are illuminated by the intense blue light of the electric arc, they work in perfectly coordinated pairs—one operating from on top of the 50-millimetre-thick steel plate and the other, invisible, from underneath.

Throwing a bridge between the high-tech world of ITER and the Indian tradition of times immemorial, participants broke coconuts to call upon the welding operations the blessing of the elephant-headed Ganesha, the ''remover of obstacles.'' (Click to view larger version...)
Throwing a bridge between the high-tech world of ITER and the Indian tradition of times immemorial, participants broke coconuts to call upon the welding operations the blessing of the elephant-headed Ganesha, the ''remover of obstacles.''
As each segment is made of two steel plates joined by a series of ribs, the same welding operations will be performed on both the upper and lower plates.

When all welding operations are completed on the six tier 1 segments, the pedestal ring (which supports the machine) and the "rim" that runs around the base will be added, thus completing, less than a year and a half from now, the single largest load of the machine assembly—the cryostat base.


return to the latest published articles