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Latest ITER Newsline

  • Component delivery| A jewel in a box

    Sailing under the flag of Germany, the Regine is a mighty ship, strengthened for heavy cargo and equipped on its portside with two 750-tonne on-board cranes. Ha [...]

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  • Education | Make your own tokamak with 3D printing!

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  • Worksite | Europe's Fusion for Energy is building the ITER installation

    Anyone driving to ITER can take full measure of the enormity of the project a few kilometers before reaching the destination. Gigantic cranes can be seen from a [...]

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  • Disruption mitigation | Experts in plasma disruptions gather online

    On 20-23 July, 120 international experts participated in the 1st IAEA Technical Meeting on Plasma Disruptions and their Mitigation, jointly organized by the Int [...]

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  • Start of assembly | World dignitaries celebrate a collaborative achievement

    Due to the constraints imposed by the COVID-19 pandemic, the crowd in the ITER Assembly Hall was small. But thanks to live broadcasting and video feed, the audi [...]

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Of Interest

See archived entries

Conference

Fun-filled vacuum

The science of ITER is not simple. But with a bit of imagination (and a dose of humour) a way can be found to convey the most complex physics notions to a public of non-specialists.

As no horse was available in the ITER amphitheatre, the re-enactment of the famous 1654 ''Magdeburg hemispheres'' experiment was conducted with two ITER volunteers. (Click to view larger version...)
As no horse was available in the ITER amphitheatre, the re-enactment of the famous 1654 ''Magdeburg hemispheres'' experiment was conducted with two ITER volunteers.
Last week, as a large number of staff members were assembled to attend the fourth presentation in a new ITER technology series, Vacuum Section leader Robert Pearce demonstrated that vacuum—the presentation's theme—not only could be made "understandable" but could also be a lot of fun.

One of the highlights of his presentation was a reenactment of the famous 1654 "Magdeburg hemispheres" demonstration, when a German scientist pumped air out of two joined copper hemispheres and had two teams of 15 horses try to separate them by pulling in opposite directions.

The ITER vacuum team members demonstrated that vacuum not only could be made ''understandable'' but could also be a lot of fun. Pictured here are Liam Worth, vacuum design and construction officer (foreground) and Silvio Giors, vacuum cryo-pumping engineer. (Click to view larger version...)
The ITER vacuum team members demonstrated that vacuum not only could be made ''understandable'' but could also be a lot of fun. Pictured here are Liam Worth, vacuum design and construction officer (foreground) and Silvio Giors, vacuum cryo-pumping engineer.
As no horses were available in the ITER amphitheatre, the experience was conducted with two volunteers: head of ITER Project Control Office Hans-Henrich Altfeld and cooling water engineer Fabio Somboli.

But like the horses of 364 years ago—and despite much pulling, puffing and panting—they were unable to overcome the atmospheric pressure that keeps the spheres attached to one another. (At this point of the presentation we learn that the atmospheric pressure comes from the gravitational force of the air molecules.)

Close to eight years ahead of schedule, ITER's First Plasma was produced last week in the Headquarters amphitheatre ... Pictured here: Vacuum Section leader Robert Pearce (left) and Silvio Giors. (Click to view larger version...)
Close to eight years ahead of schedule, ITER's First Plasma was produced last week in the Headquarters amphitheatre ... Pictured here: Vacuum Section leader Robert Pearce (left) and Silvio Giors.
There were other very interesting facts to glean from Pearce's presentation—that an absolute vacuum cannot exist even in the deepest and darkest outer space; that vacuum can boil and freeze water simultaneously; and that extremely cold surfaces coated with finely ground coconut charcoal are perfect for imprisoning helium particles.

But the most popular moment of the show was the production of a plasma, created by injecting argon gas into a small vacuum chamber equipped with a magnet, and running a current.

And there we had it: ITER's First Plasma close to eight years ahead of schedule. Not inside the Tokamak vacuum vessel as expected but onstage in the Headquarters amphitheatre ...



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