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News & Media

Latest ITER Newsline

  • Manufacturing | Completion of the first vacuum vessel gravity support

    The factory acceptance test on the first ITER vacuum vessel gravity support has been successfully completed at Haneul Engineering in Gunsan, Korea. Under the 8, [...]

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  • Technology | Hail showers in ASDEX Upgrade for ITER disruption mitigation

    Just before the 2021 Christmas holiday break, the team at the ASDEX Upgrade tokamak successfully fired frozen deuterium pellet fragments into a plasma as part o [...]

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  • Image of the week | Like a Meccano under the Christmas tree

    Like Erector set or Meccano parts scattered beneath the tree on Christmas morning, components for the ITER Tokamak cover the floor of the Assembly Hall, waiting [...]

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  • Poloidal field coils | 12 months saved on number two

    Whatever their size or position, the role of the ITER poloidal field coils is to shape and stabilize the plasma inside the vacuum vessel. However, as the plasma [...]

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  • Divertor dome | Russia delivers a full-scale prototype

    A multiyear qualification program in Russia has concluded with the successful manufacturing and testing of a full-scale divertor dome prototype at the Efremov I [...]

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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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