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  • The physics behind the transition to H-mode

    H‐mode—or thesudden improvement of plasma confinement in the magnetic field of tokamaksby approximatelya factor of two—is thehigh confinement regime that all mo [...]

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  • In search of the green plasma

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  • An outing into the future

    Open Doors days occur with scientific regularity at ITER (spring and autumn) and yet—due to the rapid evolution of work on site—each event offers something new. [...]

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  • Fusion "grandfather" tells family story

    Grandfathers like to tell stories. And Robert Aymar, the 'grandfather' of the French fusion community, is no exception. 'Being so old,' he quipped at last week' [...]

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  • An AC/DC adapter ... ITER size

    Like flashlight and smartphones, the ITER magnets—all 10,000 tonnes of them—will run on direct current (DC). And like flashlight and smartphones they will need [...]

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Of Interest

See archived articles

Laying tracks for the elevated railway

-R.A.

They're as thick and strong as railroad tracks and could easily carry the equivalent of four TGVs, two Eurostars or 15 steam locomotives. The steel rails that are being installed 43 metres above the basemat of the Assembly Hall are an essential part of the lifting system that will handle components weighing up to 1,500 tonnes.

43 metres above the basemat of the Assembly Hall, workers are laying the rails for the lifting system that will handle components weighing up to 1,500 tonnes. (Click to view larger version...)
43 metres above the basemat of the Assembly Hall, workers are laying the rails for the lifting system that will handle components weighing up to 1,500 tonnes.
When rails are laid on the ground, they rest on a bed of crushed stone (the track ballast) that distributes the load of the passing trains. In the ITER Assembly Hall, the ballast role is played by massive steel elements (9.3 metres long, 20 tonnes) called railway beams.

Resting on the vertical pillars of the Assembly Hall and running the entire length of the building, the railway beams form a perfectly smooth steel track upon which the rails can be affixed.

It will take a few weeks to install the rails and fine tune their alignment. (Click to view larger version...)
It will take a few weeks to install the rails and fine tune their alignment.
On Thursday 12 May, on the north side of the Assembly Hall, the first 18-metre length of rail was lifted, carefully deposited and fastened with heavy clips to the ledge formed by the railway beams. It will take a few weeks to install the rails and fine tune their alignment in time for the installation, beginning next month, of the girders and trolleys of the travelling crane.


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