Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • Test facility | How do electronics react to magnetic fields?

    A tokamak is basically a magnetic cage designed to confine, shape and control the super-hot plasmas that make fusion reactions possible. Inside the ITER Tokamak [...]

    Read more

  • ITER Robots | No two alike

    More than 500 students took part in the latest ITER Robots challenge. Working from the same instructions and technical specifications, they had worked in teams [...]

    Read more

  • Data archiving | Operating in quasi real time

    To accommodate the first real-time system integrated with the ITER control system, new components of the data archiving system have been deployed. Data archivi [...]

    Read more

  • Repairs | Setting the stage for a critical task

    Like in a game of musical chairs—albeit in slow motion and at a massive scale—components in the Assembly Hall are being transferred from one location to another [...]

    Read more

  • Image of the week | There is life on Planet ITER

    Dated April 2023, this new image of the ITER "planet" places the construction site squarely in the middle. One kilometre long, 400 metres wide, the IT [...]

    Read more

Of Interest

See archived entries

Divertor inner target

Europe launches manufacturing

Fifty-eight inner vertical targets—one for every divertor cassette body (54) plus four spares—will be manufactured under the procurement responsibility of the European Domestic Agency. Positioned at the intersection of magnetic field lines at the bottom of the ITER machine where particle bombardment is particularly intense, these challenging components have undergone a lengthy manufacturing qualification phase. Now, the German firm Research Instruments has been awarded a contract for the first series of 13.

An inner vertical target prototype produced by Research Instruments. Each target weighs approximately 0.5 tonnes and measures 1.5 metres in length. On the curved steel support structure are 1,104 tungsten monoblocks that are actively cooled by pressurized water. (Click to view larger version...)
An inner vertical target prototype produced by Research Instruments. Each target weighs approximately 0.5 tonnes and measures 1.5 metres in length. On the curved steel support structure are 1,104 tungsten monoblocks that are actively cooled by pressurized water.
The plasma-facing components of the ITER divertor—the inner vertical target (Europe), the outer vertical target (Japan), and the dome (Russia)—will be exposed to a heat load that is ten times higher than that of a spacecraft re-entering Earth's atmosphere (10-20 MWm²).

Tungsten, a shiny, silvery-white refractory metal that has a high melting temperature (3400 °C), will armour these plasma-facing components. For the inner vertical target, the maximum expected temperature on the tungsten surface will be about 1000 °C in normal operating conditions and 2000 °C in off-normal conditions.

During a lengthy manufacturing qualification program, the European Domestic Agency, Fusion for Energy, worked with a number of suppliers to ensure competition and mitigate technical risks through the development of different technologies. After the successful fabrication and testing of small-scale (~1/20th) tungsten monoblock mockups mounted around cooling channel, three companies—the AES Consortium (Ansaldo Nucleare, Ansaldo Energia, and SIMIC), Alsymex, and Research Instruments—were able to qualify full-scale prototypes. Among the most difficult challenges encountered were the procurement of tungsten monoblocks, the bonding of the monoblocks to the copper alloy cooling tubes, the fabrication of the steel support structure, and strict dimensional requirements.

In a major milestone that heralds the start of manufacturing, a first contract has been signed with Research Instruments for the production of 13 inner vertical targets.

See the full story on the Fusion for Energy website.



return to the latest published articles