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Scientists confirm twisty fusion device's odd magnetic fields

The world's biggest stellarator is operating as intended.
Jon Fingas, @jonfingas
December 5, 2016
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Now that the first large version of a extraordinarily complex, cruller-shaped stellarator fusion device is up and running, there's an overriding question: is it behaving the way scientists expected? Thankfully, the answer is yes. Researchers have confirmed that Germany's Wendelstein 7-X stellarator is producing the 3D magnetic fields that were anticipated from its twisty design. In fact, it's faithful to the concept with "unprecedented accuracy" -- the error rate is less than one in 100,000.

The team measured the magnetic activity by sending an electron beam along the field lines, and then using a fluorescent rod to sweep through those lines and create light in the shape of the fields. As you can see above, the result is a very scientific take on light painting.

W7-X isn't a power plant. However, confirming the nature of its magnetic fields will help prove the viability of stellarators as templates for future fusion reactors. While that means that any practical machine is likely many years away, there's at least a good reason to be patient. Stellarators promise to be safer than existing tokamak reactors, which could spark a crisis if their current fails or something disturbs their magnetic fields. Ideally, you'll get a tremendous power source that's both cleaner and safer than nuclear energy.

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