China Builds a Fake Sun.

Researchers at China's EAST fusion reactor have identified a method to overcome the "density limit," a physical constraint that has long hindered magnetic confinement fusion. By analyzing how impurities at the reactor walls cause plasma instability, the team developed a theoretical model that allows for higher plasma density without losing confinement. This breakthrough, published in Science Advances, significantly improves the efficiency of "artificial sun" technology and provides a critical foundation for future clean energy production.