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News & Media

Latest ITER Newsline

  • Vacuum vessel repair | A portfolio

    Whether standing vertically in the Assembly Hall or lying horizontally in the former Cryostat Workshop now assigned to component repair operations, the non-conf [...]

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  • European Physical Society | ITER presents its new plans

    The new ITER baseline and its associated research plan were presented last week at the 50th annual conference of the European Physical Society Plasma Physics Di [...]

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  • Image of the week | The platform's quasi-final appearance

    Since preparation work began in 2007 on the stretch of land that was to host the 42-hectare ITER platform, regular photographic surveys have been organized to d [...]

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  • Cryopumps | Preparing for the cold tests

    Before being delivered to ITER, the torus and cryostat cryopumps are submitted to a  comprehensive series of factory acceptance tests. This is not sufficie [...]

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  • Fusion technologies | Closing a fusion schism

    Historically, inertial confinement and magnetic confinement approaches to fusion have been parallel, separate processes. The ITER Private Sector Fusion Workshop [...]

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Of Interest

See archived entries

ITER NEWSLINE -

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 future operation of ITER as well as for the design basis of a next-step DEMO machine.

The KSTAR tokamak and some of its auxiliary systems, seen from the entrance to the hall. (Click to view larger version...)
The KSTAR tokamak and some of its auxiliary systems, seen from the entrance to the hall.
KSTAR is considerably smaller than ITER (with a 1.8-metre major radius as compared to 6.2 metres) and it differs in many design details. The machine achieved high-performance operation mode (H-mode) in 2010 and reached an ion temperature of 100 million °C in 2018. KSTAR has proved especially efficient in suppressing edge localized modes (ELMs), a phenomenon that can occur during H-mode during which bursts of energy and particles are expelled from the plasma.

Along with the European JET, KSTAR has been at the core of an extensive international program to validate the design of an effective disruption mitigation system based on shattered pellets injection—the very system that will be installed in ITER.

A view from the back, looking toward the entrance. One of the shattered pellet injectors that were installed in 2019 is visible in the inserted image. (Click to view larger version...)
A view from the back, looking toward the entrance. One of the shattered pellet injectors that were installed in 2019 is visible in the inserted image.
Let's take a guided tour of the pristine KSTAR hall at the National Fusion Research Institute in Daejeon, Korea.

1-2: Neutral beam injectors #1 and #2
KSTAR is presently equipped with two 110 kV positive-ion-based neutral beam injectors. A third is optional.

3: Power sources
Whereas the power source for neutral beam injector #1 is located in an adjacent building, the three modules of the power source for injector #2 are installed in the KSTAR hall proper.

4: ECEI diagnostics system
The electron cyclotron emission imaging (ECEI) diagnostic is designed to visualize the electron temperature profile and fluctuations in 2D and 3D. In case a third neutral beam injector is installed, the system would be relocated.

6: Vacuum UV diagnostics system
This prototype vacuum ultraviolet diagnostics system uses spectroscopy to monitor transport and accumulation of the tungsten particles in the plasma.

7: Pellet injector
Part of the international program of R&D on ITER disruption mitigation, two shattered pellet injectors were installed in 2019 (one is visible in the inserted image, the other is in a diametrically opposed location).The equipment was provided by US ITER through Oak Ridge National Laboratory.

8: Cryovalves box
Connected to the cryoplant outside the hall, the valves are activated to control the flux of supercritical helium circulating in the magnet system.

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