China builds world’s largest 582-tonne magnet in a major breakthrough for nuclear fusion technology, bringing the country closer to its goal of generating clean, virtually limitless electricity. Developed by the Institute of Plasma Physics under the Chinese Academy of Sciences, the newly completed superconducting magnet is a critical component of China’s next-generation fusion reactor, often referred to as an “artificial Sun.” Measuring 21 metres in length, 12 metres in width, and weighing 582 tonnes, the giant D-shaped magnet is the largest of its kind ever built.

It is designed to confine superheated plasma at temperatures exceeding 100 million°C, recreating the same fusion process that powers the Sun. The milestone strengthens China’s ambition to achieve its first fusion-based electricity generation by around 2030, positioning the country among global leaders in the race for carbon-free energy.

World’s Largest Fusion Magnet Successfully Completed

The toroidal field superconducting magnet has officially passed acceptance testing after a six-year development programme.

According to Chinese researchers, the magnet has 1.3 times the volume and three times the stored energy of comparable magnets developed for the International Thermonuclear Experimental Reactor (ITER), the world’s largest international fusion project.

Its primary role is to generate an extremely powerful magnetic field capable of containing plasma heated to approximately 100 million°C, preventing it from touching the reactor walls while fusion reactions take place.

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A Key Step Towards an Artificial Sun

An artificial Sun is a nuclear fusion reactor that mimics the energy-producing process inside the Sun by fusing hydrogen atoms under extremely high temperatures and pressure.

Unlike fossil fuels, fusion produces no carbon dioxide during electricity generation and generates significantly less long-lived radioactive waste than conventional nuclear fission reactors.

Alongside the giant magnet, Chinese scientists also successfully tested a high-temperature superconducting central solenoid coil, often described as the “heart” of a fusion reactor because it initiates and sustains the plasma required for fusion.

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Domestic Innovation Drives the Project

Researchers said China builds the world’s largest 582-tonne magnet entirely using domestically developed materials and manufacturing technologies, eliminating dependence on foreign suppliers for several critical fusion components.

The six-year programme has resulted in:

• 47 patents
• 25 industry standards

The engineering challenge was immense.

• The magnet is designed to operate continuously for 60 years at temperatures close to −269°C, while carrying electrical currents exceeding 100,000 amperes and enduring intense radiation and mechanical stress.
• Engineers also reduced electrical resistance in key connections to nearly zero, allowing electricity to flow with minimal energy loss, an essential requirement for future commercial fusion power plants.

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Building on China’s Fusion Progress

The breakthrough follows another major achievement earlier this year when China’s Experimental Advanced Superconducting Tokamak (EAST), widely known as China’s artificial Sun, maintained plasma at 100 million°C for 1,066 seconds, setting a new world record for sustained fusion conditions.

China has also outlined a three-stage roadmap for commercial fusion development:

• 2027: Completion of the Burning Plasma Experimental Superconducting Tokamak.
• Around 2030: First fusion-based electricity generation.
• Future: Construction of the China Fusion Engineering Demonstration Reactor, expected to become one of the world’s first fusion demonstration power stations.

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Challenges Still Remain

Despite the milestone, scientists caution that commercial fusion power is still several technological steps away.

Researchers must complete reactor assembly, conduct long-term operational testing, and demonstrate that the reactor can consistently produce more energy than it consumes the ultimate benchmark for practical fusion power.

Nevertheless, experts believe every advance in superconducting magnets, plasma control, and reactor engineering brings the world closer to a future powered by safe, abundant, and carbon-free fusion energy.

Key Highlights

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