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News & Media

Latest ITER Newsline

  • Tokamak cooling system | Final design achieved

    To remove the heat from the components closest to the plasma, the tokamak cooling water system will rely on over 36 kilometres of nuclear-grade piping and fitti [...]

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  • Worksite progress | Spot the differences

    Let's play the "spot the differences" game between these two general views of the ITER site, one taken last Thursday 18 January, the other three month [...]

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  • Inventions | Where have all the neutrons gone?

    It is not unusual in the course of a work day at the world's largest scientific experiment to rely on creativity to resolve the challenge at hand. But less comm [...]

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  • Neutral beam test facility | Europe delivers first-of-a-kind equipment

    Tullio Bonicelli, in charge of Europe's contributions to the ITER neutral beam heating system, calls them "beyond state-of-the-art components." The hi [...]

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  • Vacuum vessel | First segment completed in Korea

    The technically challenging fabrication of the ITER vacuum vessel is progressing in Korea, where Hyundai Heavy Industries has completed the first poloidal segme [...]

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Of Interest

See archived articles

Fusion world

Record results at KSTAR

Alberto Loarte, Confinement & Modelling Section Leader

Through long-pulse operation, the Korean tokamak KSTAR is capable of contributing to the investigation of the plasma physics of ITER, and future steady-state fusion power plants. (Click to view larger version...)
Through long-pulse operation, the Korean tokamak KSTAR is capable of contributing to the investigation of the plasma physics of ITER, and future steady-state fusion power plants.
Experiments in the Korean tokamak KSTAR in 2017 achieved record-length periods of ELM suppression by the application of three-dimensional magnetic fields with internal coils, which is the same approach for ELM control in ITER.

Edge localized modes (ELMs), which can occur during high-performance operation mode (H-mode), expel bursts of energy and particles from the plasma. The energy released can cause erosion in surrounding material, with potential impact on the lifetime of plasma-facing materials.

The new KSTAR results demonstrate the robustness of the ELM control scheme adopted for ITER. They have also provided interesting information regarding the influence of the effects of the plasma shape on the robustness of this scheme for its practical application in ITER.

In addition, robust ELM suppression has been obtained in KSTAR with 3D magnetic fields with one and two symmetry periods  in the toroidal direction (n = 1, 2) over a range of plasma currents and toroidal fields, whose ratios corresponds to the expected range for long-pulse operation in ITER (burns of 1,000 to 3,000 seconds). This indicates that there might be more flexibility regarding the shape of the 3D magnetic field that needs to be applied for ELM control in the ITER long-pulse scenarios than previously considered.


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