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China Achieves Milestone in Compact Fusion Project with Key Component Installation CAS, PUBLISHED 13.10.2025 The Burning Plasma Experimental Superconducting Tokamak (BEST), a compact fusion experiment device under construction in Hefei, east China's Anhui Province, has reached a major milestone with the successful installation of its first key component, the Dewar base, marking progress toward the world's first electricity generation from fusion power. Fusion energy, often hailed as the ideal "ultimate energy source," seeks to replicate the nuclear fusion process that powers the sun. Unlike previous fusion experimental devices, BEST is designed to demonstrate actual "burning" of deuterium-tritium plasma. Since the project's full-scale assembly began in May this year, the facility has attracted significant public attention. At the heart of BEST lies the Dewar, a core component that functions like a giant high-vacuum thermos flask. It insulates the superconducting magnets, which must operate at minus 269 degrees Celsius, enabling them to confine plasma heated to over 100 million degrees. Huang Xiongyi, associate researcher with the Chinese Academy of Sciences' Institute of Plasma Physics, said on Wednesday that the Dewar base serves as the foundation of BEST and will eventually support more than 6,000 tonnes of equipment. Weighing over 400 tonnes, measuring about 18 meters in diameter and 5 meters in height, the Dewar base is not only the heaviest single component of BEST's main machine, but also the largest vacuum component ever produced in China's fusion research field. According to Huang, the development of the Dewar base required breakthroughs in multiple advanced technical areas, including high-precision forming and welding, millimeter-scale deformation control, and ultra-high vacuum sealing. These challenges were successfully overcome, resulting in millimeter-level precision during installation. Other news: CIAE makes breakthrough in key technologies for integral fast reactor CIAE has successfully completed the principle verification test of the integral residual heat removal system. IAEA issues technical document on tritium in environment The document has 362 pages and 93 illustrations. 416 nuclear units are operating in the world 62 units are under construction. |
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