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Latest ITER Newsline

  • A world in itself

    From a height of some 50 metres, you have the entire ITER worksite at your feet. The long rectangle of the Diagnostics Building stands out in the centre, with [...]

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  • US completes toroidal field deliveries for ITER

    The US Domestic Agency achieved a major milestone in February by completing the delivery of all US-supplied toroidal field conductor to the European toroidal fi [...]

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  • Thin diagnostic coils to be fitted into giant magnets

    Last week was marked by the first delivery of diagnostic components—Continuous External Rogowski (CER) coils—from the European Domestic Agency to the ITER Organ [...]

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  • Addressing the challenge of plasma disruptions

    Plasma disruptions are fast events in tokamak plasmas that lead to the complete loss of the thermal and magnetic energy stored in the plasma. The plasma control [...]

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  • Blending (almost) seamlessly into the landscape

    Located in the foothills of the French Pre-Alps, the ITER installation blends almost seamlessly into the landscape. The architects' choice ofmirror-like steel c [...]

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Of Interest

See archived articles

The largest fridge around

-Sabina Griffith and Bharat Doshi, Cryostat Section Leader

Welded together from thick stainless steel plates measuring between 40 and 180 millimetres, the ITER cryostat will be the world's largest stainless steel high-vacuum chamber. (Click to view larger version...)
Welded together from thick stainless steel plates measuring between 40 and 180 millimetres, the ITER cryostat will be the world's largest stainless steel high-vacuum chamber.
This week, on Tuesday, 6 September, the Indian Domestic Agency ITER India signed the Procurement Arrangement for the ITER cryostat, which will be the world's largest high-vacuum chamber, worth approximately EUR 100 million. It is one of the project's largest procurements and thus represents a significant step towards the construction of ITER.

Welded together from thick stainless steel plates measuring between 40 and 180 millimetres, the cryostat forms the vacuum-tight container surrounding the ITER vacuum vessel and superconducting magnets. The massive structure will have to withstand a vacuum pressure of 1 x 10 -4 Pa; the pump volume is designed for 8,500 m3; and it will have a weight of 3,400 tons. It will have an outer diameter of 28.54 metres and be almost 30 metres tall.

The head of the Indian Domestic Agency, Shishir Deshpande, and his team signing the Procurement Arrangement this week. (Click to view larger version...)
The head of the Indian Domestic Agency, Shishir Deshpande, and his team signing the Procurement Arrangement this week.
The steel cylinder will have 23 penetrations allowing access inside of the cryostat for maintenance, as well as over 200 penetrations—some as large as four metres in size—providing access to the vacuum vessel for cooling systems, magnet feeders, auxiliary heating, diagnostics, and the removal of blanket and divertor parts. Large bellows are used between the cryostat and the vacuum vessel to allow for thermal contraction and expansion in the structures.

Due to size and weight limitations, the Cryostat will be manufactured in segments in India and a sub-assembly of four sections will be prepared at ITER's site workshop. (Click to view larger version...)
Due to size and weight limitations, the Cryostat will be manufactured in segments in India and a sub-assembly of four sections will be prepared at ITER's site workshop.
Due to size and weight limitations, the cryostat will be manufactured in segments in India and a sub-assembly of four sections will be prepared at ITER's site workshop. Finally, the four sections will be assembled into the Tokamak Pit.

The Cryostat Procurement Arrangement was number 59 on ITER's list, bringing to 71 percent the amount of in-kind procurements signed to date for the ITER Project.


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