Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Lower cylinder | A transfer that felt like art

    Art has little to do with the transfer of a giant component. On Monday however, as ITER was preparing to celebrate Leonardo da Vinci's 500th anniversary, scienc [...]

    Read more

  • Event | ITER in Da Vinci mode

    'The most noble pleasure is the joy of understanding.' Written more than 500 years ago in the private journal of Leonardo da Vinci, these words still felt timel [...]

    Read more

  • Image of the week | When the Pit inspires an artist

    On a Sunday morning, when all is silent and still on the ITER platform, an eerie dimension is added to the Tokamak Pit. Hidden eyes seem to peer through the [...]

    Read more

  • Leonardo and innovation | In the steps of a giant

    To the members of a panel on innovation and Italian leadership, the moderator had one question: how do you see Leonardo da Vinci's scientific method—a systemati [...]

    Read more

  • Image of the week | Sandblasting

    Whether at home or in a nuclear installation, a painting job begins with surface preparation. In the ITER Tokamak Pit, close to 3,000 square metres of wall need [...]

    Read more

Of Interest

See archived entries

Wendelstein achieves ultra-precise magnetic topology

A recent article in the online journal Nature Communications confirms that the complex topology of the magnetic field of Wendelstein 7-X—the world's largest stellarator—is highly accurate, with deviations from design configuration measured at fewer than 1-in-100,000.

To measure the magnetic field, the scientists launched an electron beam along the field lines. They next obtained a cross-section of the entire magnetic surface by using a fluorescent rod to intersect and sweep through the lines, thereby inducing fluorescent light in the shape of the surface. (Click to view larger version...)
To measure the magnetic field, the scientists launched an electron beam along the field lines. They next obtained a cross-section of the entire magnetic surface by using a fluorescent rod to intersect and sweep through the lines, thereby inducing fluorescent light in the shape of the surface.
In the complex shape of a stellarator, high engineering accuracy is needed because even the smallest magnetic field errors can have a large effect on the magnetic surfaces and the confinement of the plasma.

Wendelstein 7-X relies on a system of 50 non-planar and superconducting magnet coils to create a precisely shaped magnetic "cage" to confine the plasma for discharges of up to 30 minutes (projected). Following a first helium plasma in December 2015 and an initial hydrogen campaign with over 2,000 plasma pulses, the machine is now being prepared for high power operation at the Max-Planck-Institute für Plasmaphysik (IPP) in Germany.

Because a carefully tailored topology of nested magnetic surfaces is necessary for optimum confinement, the study's highly sensitive measurements provide welcome proof that such a topology is feasible and verifiable with the required accuracy.

Read the original article in Nature Communications.
Other reports at IPP and the Princeton Plasma Physics Laboratory, PPPL.


return to the latest published articles