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News & Media

Latest ITER Newsline

  • 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 [...]

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  • Vacuum vessel | India completes in-wall shielding package

    The Indian Domestic Agency has completed the procurement of about 9,000 in-wall shielding blocks and accompanying support ribs, brackets and fasteners. The majo [...]

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  • Image of the week | Feeders for the coils

    One by one, whether large or small, the elements of the system that delivers electrical power, cryogenic fluids and instrumentation to the ITER magnets are arri [...]

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  • Busbar installation | "Power cords" thicker than train rails

    Connecting an electrical device to a power source requires an extension cord, generally made of stranded copper wire. Depending on the required current intensit [...]

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  • Manufacturing | The next sector in line

    Thanks to the experience acquired during the fabrication of the first production unit of the vacuum vessel, the Korean Domestic Agency and contractor Hyundai He [...]

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Of Interest

See archived entries

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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