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

  • Top management | Tim Luce, Head of Science & Operation

    What does a seven-year-old growing up in a small community in Arkansas know about what it means to be an 'atomic scientist'? Probably not much. Except, remember [...]

    Read more

  • Blanket shield blocks | Series production milestone in Korea

    It takes many months for a single forged block of stainless steel to be transformed into the complex shape of an ITER blanket shield block, full of gullies, cha [...]

    Read more

  • Image of the week | 5 top lid segments expected

    A little less than five years ago, in December 2015, the first segments of the ITER cryostat (out of a total of 54) were delivered to the construction site from [...]

    Read more

  • On site | As ITER begins assembly, HVAC becomes mission critical

    Not only will heating, ventilation and air conditioning (HVAC) help protect people and equipment during the assembly phase at ITER, but they will also help ensu [...]

    Read more

  • Vacuum vessel | Sector #6 is leak tight

    The first ITER vacuum vessel sector has passed a helium leak test on site with flying colours. Back in March 2020, as experts from the Korean Domestic Agency [...]

    Read more

Of Interest

See archived entries

Getting closer to the heat

Sabina Griffith

A graphical image of the ITER-like wall installed in the JET tokamak. Picture courtesy: JET (Click to view larger version...)
A graphical image of the ITER-like wall installed in the JET tokamak. Picture courtesy: JET
More than 50 international fusion scientists met at the Research Centre in Jülich, Germany, this week (16-19 January) to discuss the latest developments in ITER plasma edge, divertor and wall physics. The meeting of the Scrape-Off-Layer and Divertor Topical Group (DIVSOL) is part of the International Tokamak Physics Activity (ITPA) providing a framework for internationally coordinated fusion research activities.

For experts in divertor, and plasma boundary and wall physicsphysics, this meeting was of particular significance since important decisions about the strategy for the ITER divertor will be required within the coming two years. The question at stake is whether to start with tungsten (W) right away or whether to start with a carbon fibre-reinforced carbon composite (CFC) during the non-nuclear phase and switch to tungsten once the deuterium-tritium operations commence. (Also read Newsline # 196).

The ITPA DIVSOL research activities are therefore strongly focused on solving critical issues associated with issues such as the melting behavior of tungsten under uncontrolled events and the consequences this will have on plasma operation. Meanwhile, the CFC divertor remains the reference strategy before firm conclusions about the issues have been achieved. 

 (Click to view larger version...)
One of the highlights of this week's meeting was the discussion of first results coming from the recently installed "ITER-Like Wall" in the JET tokamak, jointly operated by the EU partners. JET is now running with the same material mix foreseen for the ITER plasma-facing components, using beryllium in the main chamber and a full tungsten divertor. First results show a significantly reduced retention of the plasma fuel in the wall materials, compared with equivalent operation with carbon walls. With a drastically reduced carbon plasma contact, low oxygen levels and low tungsten release rates at high density operations the overall performance of this material mix looks promising.

We thank Volker Philipps (FZ Juelich) and Emanuelle Tsitrone (CEA) for their contributions to this article.



return to the latest published articles