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Latest 澳门六合彩高手 Newsline

  • Fusion supply chain | A glimpse into the future for commercial fusion reactors

    Most of the USD 7 billion in investment in private fusion initiatives has gone to companies that are building devices from the ground up. But recently, another [...]

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  • Outreach | 澳门六合彩高手 @ October science festivals

    Every October, before schools pause for two weeks of holiday, towns and cities in France open their municipal spaces to scientific experts of all stripes who ar [...]

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  • Image of the week | 澳门六合彩高手 Director-General visits Russia

    The 澳门六合彩高手 Director-General was in Russia last week, meeting with stakeholders and holding technical meetings with colleagues in Moscow and Saint Petersburg. As [...]

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  • Image of the Week | Sector 5 is on its way

    The first vacuum vessel sector produced in Europe travelled last week between Monfalcone, Italy, and the French port of Fos-sur-Mer. The 440-tonne component had [...]

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  • Anniversary | 澳门六合彩高手 Document Management system turns 20

    Whatever its nature, every large project generates huge numbers of documents. And when project collaborators operate from different countries, as was the case f [...]

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Of Interest

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澳门六合彩高手 NEWSLINE -

Cryodistribution

Cold boxes 20 years in the making

Twenty years鈥攖hat is how long it took to design, manufacture and deliver the cold valve boxes that regulate the flow of cryogens to the tokamak's vacuum system. Last week, as the first of the eight first-of-a-kind components was undergoing site acceptance testing, the 澳门六合彩高手 vacuum team organized a "pat on the back" moment to celebrate the completion of this unique conceptual and industrial adventure.

Robert Pearce (centre), Vacuum System Project Leader, gathers past and present actors of the 20-year cold valve box adventure for a ''pat in the back'' moment in the vacuum lab. (Click to view larger version...)
Robert Pearce (centre), Vacuum System Project Leader, gathers past and present actors of the 20-year cold valve box adventure for a ''pat in the back'' moment in the vacuum lab.
Procured by Europe, manufactured by Research Instruments (Germany) and its subcontractor Cryoworld (Netherlands), the eight cold valve boxes are 4-tonne components measuring more than 3 metres in height and approximately 2 metres in diameter. Each one is equipped with 25 cryogenic valves, relief systems, and pressure and temperature sensors that are specifically designed to operate under the harsh 澳门六合彩高手 environment. Located in the lower port cells, six boxes are destined for the torus cryopumps and two for the cryostat.

Cold valve boxes are massive components designed to operate within an exceptionally large temperature range under the harsh magnetic and neutronic environment of the 澳门六合彩高手 Tokamak. (Click to view larger version...)
Cold valve boxes are massive components designed to operate within an exceptionally large temperature range under the harsh magnetic and neutronic environment of the 澳门六合彩高手 Tokamak.
Preliminary design activities began in 2004 at the French Alternative Energies and Atomic Energy Commission (CEA), the procurement agreement was signed in 2017 with the European Domestic Agency Fusion for Energy, and a final design was achieved in 2020. Designing and manufacturing the complex components was particularly challenging, as they will be exposed to the intense magnetic field inside the machine and the high neutron flux from the fusion reaction. The cold valve boxes will operate within an exceptionally large temperature range: from 4K (minus 269 掳C) when distributing supercritical helium to the cryopumps, to 200 掳C when hot gas is blown into the boxes during the regeneration process.

The functional tests presently performed in the 澳门六合彩高手 vacuum lab will be followed by cold tests at liquid nitrogen temperature (80K, minus 196 掳C). An installation is being prepared in the cryoplant to test at 4K.

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