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News & Media

Latest ITER Newsline

  • Divertor inner target | Trial by fire

    The first full-scale industrial prototype of a divertor inner vertical target has successfully passed through a rigorous campaign of thermal testing. In the [...]

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  • In-vessel tasks | Step right up onto the platform

    In order to accommodate the dozens of teams that will be involved with assembly tasks on the inside of the vacuum chamber, the ITER Organization has designed a [...]

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  • Steady at the helm | Bernard Bigot accepts a second term

    In a unanimous decision, the ITER Council has voted to reappoint Dr Bernard Bigot to a second five-year term as Director-General of the ITER Organization. The C [...]

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  • Electrical network | Independance Day

    For over 10 years, power has been supplied to ITER by the neighbouring CEA research facility. Since Saturday, however, the entire ITER site is independently pow [...]

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  • Image of the week | A long journey for the last cold box

    Procured by India and manufactured by Linde Kryotechnik AG near Zürich, Switzerland, the last of the cold boxes needed for the ITER cryoplant has begun its long [...]

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Of Interest

See archived entries

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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