Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Bookmark | The Future of Fusion Energy

    To write about fusion is to walk a fine line between the temptation of lyricism and the arid demands of scientific accuracy. Whereas the general media tends to [...]

    Read more

  • Image of the week |The shine of silver

    All ITER components are precious. But some look more precious than others. A vacuum vessel sector, a toroidal field coil, a cryopump, or a divertor cassette a [...]

    Read more

  • JT-60SA | "ITER satellite" to begin operating next year

    In a major assembly milestone for the JT-60SA tokamak, the 12-metre-tall central solenoid was successfully installed by overhead crane on 8 May. Japanese televi [...]

    Read more

  • ITER physics school | Ten years of lectures now available

    The lectures from ten ITER International Schools held since 2007 have been collected and are now available through a dedicated webpage on the ITER website. I [...]

    Read more

  • "Vigyan Samagam" | India showcases megascience

    From micro to macro—specifically, from the India-based Neutrino Observatory (INO) that will study neutrino mass ordering events lasting 10-43 seconds, to the La [...]

    Read more

Of Interest

See archived entries

Cryostat

Next phase for lower cylinder

At approximately 250 tonnes, the second tier of the ITER cryostat's lower cylinder represents only 15 percent of the cryostat's total weight. Still, in order to weld together its many segments, no less than 1.3 tonnes of filling metal will be required—another amazing figure that opens a window into the unique world of the super-massive ITER components ...

Working in pairs, one man on either side of the massive steel plates, welders will use approximately 1.3 tonnes of filling metal to finalize the welding of the second tier of the cryostat's lower cylinder. (Click to view larger version...)
Working in pairs, one man on either side of the massive steel plates, welders will use approximately 1.3 tonnes of filling metal to finalize the welding of the second tier of the cryostat's lower cylinder.
Following a traditional coconut ceremony, welding operations began on 21 February in the onsite Cryostat Workshop for the second level (tier two) of the lower cylinder.

Operating in tandem, one on either side of the cylinder's steel plates, welders will progressively fill the 5.2-metre-high, 50-millimetre-wide, trough-shaped seams between the segments using a technique called "butt welding." The total length of the welds for this part of the lower cylinder will add up to 160 metres.

Controlling distortions is always an issue when welding large high-tech components. "In the ITER cryostat, because of the number of openings, ports and penetrations and also because of the sheer mass of welds involved, welding is a considerable challenge", explains Vikas Dube, the responsible officer for manufacturing activities in the workshop.

Welding operations on the second tier of the lower cylinder should be complete by late March and the whole assembly (tiers one and two) is expected to be ready for factory acceptance testing in June.

 


return to the latest published articles