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Latest ITER Newsline

  • Computer-Aided Design | A new platform with Australia

    In September 2016, the signature of a Cooperation Agreement between the Australian Nuclear Science and Technology Organisation (ANSTO) and the ITER Organization [...]

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  • Ten years later | A prodigious adventure

    ITER began its existence as an aspiration in the early 1980s, as actors in the fusion community called for the joint machine that would demonstrate the feasibil [...]

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  • Image of the week | An impromptu visit

    Afteraddressing the UN Climate Change Conference on 15 November, French President Emmanuel Macron toured thecolourful COP23 exhibition zone. It was towards the [...]

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  • Cryoplant | How to install a compressor

    In order to properly install a helium compressor skid on its concrete pad, you need to start with a large push broom to sweep away the dust that inevitably accu [...]

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  • Magnetic system | Nine rings to fight the force

    Work on the pre-compression ringsof the ITER magnet system progresses in Europe, where work on a full-scale prototype is underway. These technically challenging [...]

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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 tonnes. 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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