Last year, scientists started up a new type of massive nuclear fusion reactor for the first time, known as a stellarator.
Researchers at the Max Planck Institute in Greifswald, Germany, injected a tiny amount of hydrogen and heated it until it became plasma, effectively mimicking conditions inside the sun.
But since then scientists have been asking whether the ambitious device – named Wendelstein 7-X (W7-X) – works as it is supposed to, producing the right magnetic fields.
Now a research paper has shown tests over the past few months have proven the complex design is working as expected.
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