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News & Media

Latest ITER Newsline

  • A world in itself

    From a height of some 50 metres, you have the entire ITER worksite at your feet. The long rectangle of the Diagnostics Building stands out in the centre, with [...]

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  • US completes toroidal field deliveries for ITER

    The US Domestic Agency achieved a major milestone in February by completing the delivery of all US-supplied toroidal field conductor to the European toroidal fi [...]

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  • Thin diagnostic coils to be fitted into giant magnets

    Last week was marked by the first delivery of diagnostic components—Continuous External Rogowski (CER) coils—from the European Domestic Agency to the ITER Organ [...]

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  • Addressing the challenge of plasma disruptions

    Plasma disruptions are fast events in tokamak plasmas that lead to the complete loss of the thermal and magnetic energy stored in the plasma. The plasma control [...]

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  • Blending (almost) seamlessly into the landscape

    Located in the foothills of the French Pre-Alps, the ITER installation blends almost seamlessly into the landscape. The architects' choice ofmirror-like steel c [...]

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Of Interest

See archived articles

Turning the tables on turbulence

-Culham Centre for Fusion Energy, CCFE

Image of plasma fluctuations in the MAST divertor, showing where the filaments are brightest and instabilities are strongest. (Click to view larger version...)
Image of plasma fluctuations in the MAST divertor, showing where the filaments are brightest and instabilities are strongest.
Plasma turbulence has been the bane of fusion scientists for decades. But now they're getting their own back—images of plasma inside the MAST tokamak at Culham are showing how turbulence could actually tackle one of the hottest issues in fusion reactor design.

Plasma is a fascinating but frustrating fact of life for researchers developing fusion energy. The fourth state of matter, despite making up most of the universe, still holds many secrets for Earth-bound physicists. Controlling this incredibly hot ionised gas in a magnetic field within a tokamak is a proven way of triggering fusion reactions, but the downside is that the plasma becomes turbulent and unstable, making it difficult to confine—analogous to the creation of blobs in a lava lamp, or the break-up of clouds in the sky.

The MAST videos provide the closest view yet of plasma in the tokamak's exhaust system, the divertor, and may hold the key to dealing with the intense heat ejected from the fusion chamber onto surrounding surfaces. This is a major concern for researchers designing full-scale tokamak power plants.

The divertor, made from extremely tough materials, acts as a target for the waste plasma, and pumps helium ash and impurities out of the tokamak. But in a fusion power plant the divertor will be exposed to power loads of tens of megawatts per square metre (many times greater than a spacecraft re-entering the atmosphere), putting a strain on even the toughest of structures.

Continue reading on the CCFE website


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