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Latest ITER Newsline

  • CODAC | The "invisible system" that makes all things possible

    It is easy to spot all the big equipment going into ITER; what is not so visible is the underlying software that makes the equipment come alive. Local control [...]

    Read more

  • Assembly | Zero-gravity in a cramped place

    The volume of the Tokamak pit may be huge, but so are the components that need to be installed. As a result, assembly operators will have very little room to ma [...]

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  • Image of the week | A closer look at KSTAR

    Over its twelve years of operation, the KSTAR tokamak (for Korea Superconducting Tokamak Advanced Research) has built an extremely valuable database for the fut [...]

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  • Pre-compression rings | Six of nine completed

    The European Domestic Agency is responsible for the fabrication of nine pre-compression rings (three top, three bottom and three spare). The first five have bee [...]

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  • Industrial milestone | Japan completes the first D-shaped coil of the ITER Tokamak

    In a ceremony on 30 January, a major industrial achievement was celebrated in Japan—the completion of the first 360-tonne D-shaped toroidal field coil for the I [...]

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Of Interest

See archived entries

Divertor cassettes

Successful prototypes open way to series

Before embarking on the fabrication of the 54 complex steel structures that will form a ring at the bottom of the ITER machine—the divertor cassettes—the European Domestic Agency has been collaborating with industry on the development of real-size prototypes. This phase is now concluding, and the contract for the first series will soon be launched.

Producing such a complex piece of equipment requires advanced expertise in precision machining and welding. Each prototype was progressively fashioned from 25 tonnes of high-grade steel. © Walter Tosto (Click to view larger version...)
Producing such a complex piece of equipment requires advanced expertise in precision machining and welding. Each prototype was progressively fashioned from 25 tonnes of high-grade steel. © Walter Tosto

With a component as complex as the divertor cassette bodies ... better to be safe than sorry.

These U-shaped steel structures at the bottom of the vacuum vessel act as the chassis for components facing the most blistering heat of ITER operation—the divertor dome and inner and outer targets. The cassette bodies are also designed to resist transient electromagnetic induced forces as high as 100 tonnes, provide neutron shielding for the vacuum vessel, and host diagnostic systems and cooling water channels. There are more than a dozen design variants.

Since 2013 the European Domestic Agency—which is providing all 54 divertor cassettes to ITER as well as the inner vertical targets—has been working with industry to develop full-scale prototypes, a strategy that encouraged multiple suppliers to get involved and served to verify that the required quality could be achieved at acceptable cost.

Two European firms carried their participation through to the end—Walter Tosto in Italy and the French-Italian CNIM-SIMIC consortium. The final dimensional checks of the initial procurement program were completed a few weeks ago and cold/hot helium leak tests were successfully performed.  With these results in hand, the European agency is preparing to issue a call for tender for the first series of divertor cassette bodies (not to exceed 20).
 
To find out more, please see the European Domestic Agency website.
 
You can download a poster of the ITER divertor here.


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