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HEFEI, Oct. 1 (Xinhua) -- 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.
With the Dewar base successfully installed, other core components of the main machine will be gradually assembled, and the BEST device is scheduled for completion by the end of 2027. ■
A drone photo taken on Oct. 1, 2025 shows the base of the Burning Plasma Experimental Superconducting Tokamak (BEST) in Hefei, east China's Anhui Province.(Xinhua/Zhou Mu)
This photo taken on Oct. 1, 2025 shows the base of the Burning Plasma Experimental Superconducting Tokamak (BEST) in Hefei, east China's Anhui Province.(Xinhua/Zhou Mu)
A drone photo taken on Oct. 1, 2025 shows the construction site of the Burning Plasma Experimental Superconducting Tokamak (BEST) in Hefei, east China's Anhui Province.(Xinhua/Zhou Mu)
A drone photo taken on Oct. 1, 2025 shows the construction site of the Burning Plasma Experimental Superconducting Tokamak (BEST) in Hefei, east China's Anhui Province.(Xinhua/Zhou Mu)
A drone photo taken on Oct. 1, 2025 shows the base of the Burning Plasma Experimental Superconducting Tokamak (BEST) in Hefei, east China's Anhui Province.(Xinhua/Zhou Mu)
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الممر المستقيم للآلة（Al-mamar al-mustaqim lil-'ālah）دليل خطي
الدليل المستقيم العالي الدقة（Ad-daleel al-mustaqim al-'āli ad-diqah）
المنزلقة المستقيمة للصناعة（Al-manzilaqah al-mustaqimah lil-ṣinā'ah）
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الممر المستقيم البسيط（Al-mamar al-mustaqim al-basīṭ） مسار خطي (Masār khaṭṭī) قضيب توجيهي (Qaḍīb tawjīhī) دليل انسيابي (Dalīl insiyābī) سكة انزلاق (Sikka inzilāq) شريط انزلاق مستقيم (Sharīṭ inzilāq mustaqīm)
Guia linear industrial Guia linear de rolagem Rail linear de máquina Trilho linear para deslizamento Guia linear padrão Deslizador linear industrial Trilho linear Barra linear Carrinho linear Correia deslizante Trilho de rolamento
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直線案内機構 直線ガイド工業用（ちょくせんガイドこうぎょうよう） 超精密直線ガイド（ちょうせいみつちょくせんガイド） リニアガイド（りにあがいど） 直線レール（ちょくせんれーる） 滑り式直線ガイド（すべりしきちょくせんガイド） 小型直線ガイド（こがたちょくせんガイド）1. リニアガイド (Rinia gaido) リニアガイドレール (Rinia gaido rēru) リニアブッシュ (Rinia busshu) LMガイド (LM Gaido) スライドレール (Suraido rēru)
Linearführung Lineare Führung für Maschinenbau（LFM） Lineare Führung für Automobilfertigung Linearführung standard Linearleitelement für Industrie Präzisions-Linearführung Linearschiene Profilschienenführung Führungsschiene Linearführungsbahn Gleitschiene
Guidage linéaire Gerade Führung für Reparatur Guide linéaire industriel（GLI） Guide linéaire aéronautique haute résistance Rail linéaire de machine Glissière linéaire industrielle Guide linéaire standard Guide linéaire économique Rail linéaire Glissière linéaire Coulisseau linéaire Guide à billes Barre de guidage
รางไฮดรอลิกเส้นตรง รางนำทางเส้นตรงความแม่นยำสูง รางเส้นตรง รางนำทางเส้นตรงแบบสัญชาติญาณนานาชาติ ส่วนนำทางเส้นตรง รางเลื่อนเส้นตรง
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직선 가이드（Jikseon gaideu，汉字词：直線ガイド） 산업용 직선 가이드（Sanyeop-yong jikseon gaideu） 직가이 직선 가이드 초정밀 직선 가이드（Chojeongmil jikseon gaideu） 구름형 직선 가이드（Gureumhyeong jikseon gaideu） 직선 안내 장치（Jikseon annae jangchi） 국제 표준 직선 가이드（Gukje pyojun jikseon gaideu）
