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Latest ITER Newsline

  • Data | Archiving 20 gigabytes per second—and making it usable

    One of the main deliverables of ITER is the data itself—and there will be a tremendous amount of it to store and analyze. During First Plasma, the highest produ [...]

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  • Electrical tests | High voltage, high risk

    In the southern part of the construction platform, a one-hectare yard hosts some of the strangest-looking components of the entire ITER installation. Rows of to [...]

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  • Vacuum vessel | First sector safely docked

    It was 8:00 p.m. on Tuesday 6 April and something quite unusual happened in the ITER Assembly Hall: applause spontaneously erupted from the teams that h [...]

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  • Remote ITER Business Meeting | Virtual interaction, tangible opportunities

    While the advent of Covid-19 has not stopped the relentless advancement of the ITER Project, it has certainly prompted ingenuity in how ITER conducts its work. [...]

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  • Manufacturing | Europe completes pre-compression rings

    The French company CNIM (Toulon) has produced a tenth pre-compression ring for the ITER Project on behalf of Fusion for Energy, the European Domestic Agency. Th [...]

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Of Interest

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Image of the week

Bullseye

Two perfectly circular structures, looking a lot like archery targets, have been installed on the west-facing wall of the Tokamak Complex.

Two large circular openings (not yet visible) will allow power to reach ITER's two heating neutral beam injectors. Today, we can see the opening reserved for a third provisional heating injector (at right) and a smaller ''penetration'' at left for the diagnostics neutral beam injector. (Click to view larger version...)
Two large circular openings (not yet visible) will allow power to reach ITER's two heating neutral beam injectors. Today, we can see the opening reserved for a third provisional heating injector (at right) and a smaller ''penetration'' at left for the diagnostics neutral beam injector.
They are not for shooting, however. The target-like structures mark what will be openings in the concrete for high voltage transmission lines to feed power to the neutral beam injectors.

Injecting high-energy neutral particles into the plasma is the most powerful way to heat it. ITER will be equipped with two heating neutral beam injectors (with a provision for a third) and a neutral beam line for diagnostic purposes.

Neutral beam injectors are massive devices, as large as a school bus, that require considerable electrical power to operate. The transmission lines that will go through the circular opening (one for each injector) will carry extremely high voltage (1 megavolt¹) that requires specific electrical insulation.

A set of dedicated buildings nearby will host the multistage conversion process of the electrical current coming from the 400 kV switchyard—first from AC to DC, then to AC again in order ensure stability, and finally to DC again.

The size of the neutral beam injectors is apparent in this drawing, which shows them in relation to the vacuum vessel (at left). The transmission lines, which must travel through the wall of the Tokamak Building, are correspondingly massive. (Click to view larger version...)
The size of the neutral beam injectors is apparent in this drawing, which shows them in relation to the vacuum vessel (at left). The transmission lines, which must travel through the wall of the Tokamak Building, are correspondingly massive.
The transmission lines will range from 80 to 150 metres in length, depending on the location of the circular openings. Once they pass through the concrete wall of the Tokamak Building, they will take a 90-degree turn to plunge down to the injectors (see drawing).

The ITER neutral beam injection system will be able to deliver approximately one-third of the total heating power needed to bring the plasma to fusion temperature.

¹One megavolt is more than twice the capacity of high-voltage overhead power lines.



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