The Burning Plasma Experimental Superconducting Tokamak (BEST) represents a bold yet pragmatic step in Chinese Mainland’s quest to make nuclear fusion a viable energy source. Situated in Hefei, Anhui Province, BEST is a high-field, superconducting tokamak engineered to reach burning-plasma conditions, where fusion reactions become largely self-sustaining and the plasma generates most of its own heating.

Weighing more than 6,000 tonnes and constructed around sophisticated superconducting magnets, BEST will use deuterium–tritium (D-T) fuel and high‑power heating systems to drive plasmas beyond 100 million°C. Its toroidal chamber, with a 3.6 m major radius, is designed to support number densities reaching 10²⁰ m⁻³ at temperatures consistent with the D–T reaction cross‑section peak near ~15 keV.

In the D + T → ⁴He++ (α, 3.52 MeV) + ⁰n (14.07 MeV) reaction, energetic α‑particles and neutrons deposit heat into the vessel walls and capturing that heat efficiently is central towards power generation. BEST aims to demonstrate a fivefold energy gain (Q ≈ 5) by 2027 — putting in one unit of external heating to produce five units of fusion power  — targeting up to 200 MW of fusion power in a plasma volume of roughly 86 m³, and acting as a transition from experimental platforms such as the Experimental Advanced Super Tokamak (EAST) to future commercial‑scale efforts like the Chinese Fusion Engineering Demo Reactor (CFEDR); its objective is to demonstrate net plasma energy production and to define a technological pathway toward fusion‑powered electricity.

BEST’s success could be transformative for global climate goals. Fusion energy produces virtually no greenhouse gas emissions with minimal long-lived radioactive waste, making it an ideal complement to renewables in achieving carbon neutrality. If BEST meets its targets, it will demonstrate that fusion can deliver large-scale, reliable, and clean energy without the intermittency challenges of solar and wind, thus not only bolstering Chinese Mainland’s energy security but also accelerating the global transition away from fossil fuels, hence offering a sustainable climate change solution.

In summary, BEST is beyond a scientific experiment—it is a strategic step toward commercial fusion energy and a potential game-changer for carbon neutrality. While market challenges remain, its successful operation could redefine the global energy landscape and help meet the world’s ambitious climate targets.

This article is contributed by Mr Eric Lee with the coordination of the Nuclear Division.