China’s Fusion Reactor Reached an ‘Unbreakable’ Limit—and Broke Right Through It

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Reproducing the energy of the Sun on Earth remains one of the most ambitious technological challenges of the century. Despite decades of research, nuclear fusion still struggles to cross certain critical thresholds, held back by physical limits that were thought to be unsurpassable. Yet, a Chinese experimental reactor has just upset this balance. Repelling a barrier that is considered unsettling, it opens an unexpected breach in the understandin…

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Imagine for a moment capturing the very essence of the Sun, compressing it in a metal chamber of a few cubic meters, and keeping it long enough to extract an almost infinite energy from it. This is exactly what Chinese scientists have just accomplished with their EAST reactor, crossing a barrier that has been frustrating physicists for decades. [...]

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The advanced experimental superconductor tokamak (EAST), the Chinese nuclear fusion reactor, has just taken a new step by pushing the plasma beyond the Greenwald limit. Previously considered a major obstacle to the realization of nuclear fusion, it is an empirical threshold observed in the tokamaks, which prevents the plasma from reaching extreme densities. These results could suggest an experimental path to push back certain plasma density limi…