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Latest ITER Newsline

  • Neutral beam injection | How ELISE is contributing to ITER

    ITER's neutral beam injection system is based on a radio frequency source that has been the subject of decades of development in Europe. At Max Planck Institute [...]

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  • Image of the week | Almost there

    The Tokamak Building has reached its maximum height ... in terms of concrete that is. The 'jewel box' in reinforced concrete will grow no more; instead, it will [...]

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  • Powerful lasers | A mockup to demonstrate safety

    During ITER operation, high-powered lasers will gather important diagnostic information on the properties and behaviour of the plasma, such as density, temperat [...]

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  • Cryostat | Lower cylinder revealed

    They were all there: those who designed it, those who forged it, those who assembled and welded it, and those who closely monitored the requirements and procedu [...]

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  • Europe's DEMO | What it could be like

    It looks like ITER, feels like ITER, but it's not ITER. In this depiction of what the site layout for the next-step fusion machine, DEMO, might look like in Eur [...]

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Of Interest

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Piece by piece the vacuum vessel takes shape

The AMW consortium (Ansaldo Nucleare S.p.A, Mangiarotti, Walter Tosto) was chosen in 2010 by the European Domestic Agency to manufacture Europe's contribution to the ITER vacuum vessel. The photos below document progress at Walter Tosto, where activities are underway to manufacture the different elements that make up a full vacuum vessel sector.

Many sub-assemblies make up each upper poloidal segment PS2. Pictured, technicians at Walter Tosto position and tack weld flexible housings that will be situated between the double walls of the vacuum vessel. The next step is electron beam welding. (Click to view larger version...)
Many sub-assemblies make up each upper poloidal segment PS2. Pictured, technicians at Walter Tosto position and tack weld flexible housings that will be situated between the double walls of the vacuum vessel. The next step is electron beam welding.
The ITER vacuum vessel will be twice as big and sixteen times as heavy as the largest tokamak in operation today. Its double-wall structure is designed to provide a high quality vacuum for the plasma as well as the first confinement barrier for tritium, forming an important part of safety of the ITER device.

The complex doughnut-shape container is formed from nine sectors that are welded together. Four segments go into the manufacturing of a sector (inboard, upper, equatorial and lower).

Seen from above, one sub-assembly for upper poloidal segment PS2 under fit-up last autumn. The sub-assembly is made of 2 inner shells, 60-millimetre formed plates, 3 poloidal ribs, 16 flexible housings and 4 inter-modular keys. Now, the sub-assembly has been fully welded and the repair of some localized defects is ending. (Click to view larger version...)
Seen from above, one sub-assembly for upper poloidal segment PS2 under fit-up last autumn. The sub-assembly is made of 2 inner shells, 60-millimetre formed plates, 3 poloidal ribs, 16 flexible housings and 4 inter-modular keys. Now, the sub-assembly has been fully welded and the repair of some localized defects is ending.
Technicians at Walter Tosto are carrying out the cold and hot press forming activities for all the segments of the AMW consortium and the full manufacturing of two of the segments—the upper (PS2) and equatorial (PS3) poloidal segments. Each of these in turn is formed from several sub-segments.

When completed, each vacuum vessel sector will be 13 metres high, 6.5 metres wide, 35-85 thick (double wall) and weigh about 450 tonnes.

For more about the ITER vacuum vessel, click here.


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