558
China’s ‘artificial sun’ breaks nuclear fusion limit thought to be impossible
(www.the-independent.com)
this post was submitted on 10 Jan 2026
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In sum, these guys at EAST got the Greenwald limit elevated in their tokamak, which indirectly influences the Lawson criterion: nTTau, density * time at said density * plasma energy released. Lawson is the master finish line for measuring whether a fusion system can actually make more power than it consumes.
To date, when you cross the Greenwald limit, the man/woman in the operators seat should expect the plasma inside the device to become uncontrollable, hurting the reactor by touching the walls or instruments inside, a so-called "disruption". Only a few topologies like the stellerator can exceed the limit, and so far, only by 5x.
But here we have a way to exceed the limit in the much more researched tokamak. This research has positive impact for all but the weirdest/niche fusion devices.