en.Wedoany.com Reported - Hefei Keye Electrophysics Equipment Manufacturing Co., Ltd. and Zhejiang Ziming Cryogenic Technology Co., Ltd. serve as a comprehensive fusion device general contractor and an ultra-low temperature equipment supplier, respectively, filling two critical gaps in China's magnetic confinement fusion industry chain: the system engineering integration and stable operation of magnet systems. The former possesses the capability to design and deliver complete machines for four mainstream technical routes—tokamak, stellarator, field-reversed configuration, and reversed-field pinch—making it the only high-end equipment comprehensive service provider in China capable of simultaneously adapting to these four technical routes. The latter offers a domestic cryogenic equipment matrix covering the full temperature range from 2K to 200K, providing a cold source for maintaining the superconducting state of superconducting magnets.
Founded in 2007, Hefei Keye relies on three core processes—high-precision forming and integrated insulation of three-dimensional profiled coils, specialized welding of precision profiled vacuum chambers, and full-area integration and complete testing of complex irregular structures—to achieve a full lifecycle service from top-level scheme design, specialized precision machining, multi-system integration, and full-dimensional performance testing to on-site engineering commissioning. Its product line covers six major systems: superconducting magnets, precision diagnostics, ultra-low temperature supporting equipment, ultra-high vacuum chambers, ion cyclotron heating, and specialized pulse power supplies. Typical projects include participation in the integration of the ITER PF6 400-ton superconducting magnet, the development and integration of the CS model coil for the China Fusion Engineering Test Reactor (CFETR), turn-to-turn insulation wrapping of the CRAFT TF coil, winding of the BEST TF low-field coil and PF coil, and the delivery of China's first quasi-axisymmetric stellarator (CFQS) complete machine. The company has also exported ion cyclotron heating antennas to overseas devices such as WEST in France and Germany's ASDEX. In the welding of dissimilar materials, the company masters vacuum brazing and electron beam welding technologies for materials such as ceramics, titanium alloys, and oxygen-free copper, with related processes having twice won the First Prize of Anhui Provincial Science and Technology Award. The company is equipped with a full set of testing equipment including coordinate measuring machines, laser trackers, X-ray, ultrasonic and phased array flaw detection, and helium leak detection, and holds over 100 patents and 4 software copyrights.
Zhejiang Ziming Cryogenic Technology Co., Ltd., relying on a technical team from Zhejiang University, was established in 2022. Its core products include large-capacity Stirling cryocoolers (with 77K cooling power up to 1050W/4000W, efficiency exceeding 10.1%, maintenance intervals over 6000 hours, and procurement costs only 60-70% of comparable imported products), ultra-low temperature precision control valves (covering a temperature range from 1.8K to 353K, with internal leakage below 1×10⁻⁷ Pa·m³/s and external leakage below 1×10⁻⁹ Pa·m³/s), ultra-low heat leak cryogenic fans (with 20K static heat leak below 15W, maximum head of 180m, and pressure resistance of 3.5 MPa), and complete cryogenic integration systems. In practical applications, its integration solutions can reduce liquid nitrogen loss from 18.75% to 5.8%. These devices address issues such as high procurement costs, long delivery cycles, and slow after-sales response for imported cryogenic equipment, filling the industry chain gap for the ultra-low temperature constant temperature base required for the stable operation of superconducting magnets.
The complete set of general contracting capabilities of Hefei Keye and the cryogenic equipment of Zhejiang Ziming, together with the oil-free vacuum equipment of Nawi Intelligent, the radiation-resistant protective materials of Hecai Gaoke and Maiwei, the heating power supply systems of Xihua Boyuan and Shanghai Shuyan Juchuang, and the measurement and control hardware of Zhongneng Jiekong, as reported in the previous three installments, form a complete supporting system, collectively improving the domestic ecosystem for China's fusion equipment.
