Multiple countries working together to build an "artificial sun" have reached an important milestone.

The official website of the International Thermonuclear Experimental Reactor (ITER) recently announced that after decades of effort, the "artificial sun" built by more than 30 countries has completed the construction of its "electromagnetic heart" the world's largest and strongest pulsed superconducting magnet system. This achievement is called a "milestone achievement" by ITER, marking a crucial step towards the realization of controlled nuclear fusion energy by humanity. This magnet system consists of a central solenoid and six toroidal field coils working together. The central solenoid is a cylindrical magnet with a total height of 18 meters and a diameter of 4.25 meters, with a magnetic field strength of 13 tesla, equivalent to 280,000 times the strength of the Earth's magnetic field, powerful enough to lift an aircraft carrier, with a structural strength capable of withstanding forces equivalent to twice the thrust of a space shuttle launch. The toroidal field coils are superconducting magnets with diameters ranging from 9 to 25 meters, manufactured with Chinese participation. The fully assembled pulsed magnet system will weigh close to 3000 tons.