According to the website of the Institute of Plasma Physics, Chinese Academy of Sciences, the construction of the compact fusion energy experimental facility BEST has made a key breakthrough recently.
The main component of the BEST device, the DUV base, has been successfully developed and delivered, and has been accurately positioned and installed in the main hall of the BEST device. As the first critical component to be placed in the main hall, the installation of the DUV base marks that the main construction of the BEST project has entered a new stage, and the development of components and engineering installation have started to "accelerate".
The DUV base is the first vacuum large component of the BEST device, with complex design conditions and hundreds of interfaces. It has a large structural size, with a diameter of about 18 meters, a height of about 5 meters, and a total weight of more than 400 tons. It is the heaviest component in the BEST host system, and also the largest vacuum component in the domestic fusion field. This component carries the support and thermal insulation functions for nearly 7,000 tons of the BEST device's weight, and its installation accuracy directly affects the stability and safety of the entire project. The project team worked together, successively overcoming key technologies such as high-precision forming and welding, millimeter-level deformation control, and high-vacuum sealing, and successfully developed the DUV base component.
The lifting precision of the DUV base is high, with the surface level difference needing to be controlled within 15 mm, and the positioning deviation must not exceed ±2 mm. The working space is extremely narrow, with the minimum gap between the outer edge of the base and the shielding wall of the host pit being less than 100 mm. Faced with these challenges, the project team worked continuously and overcame difficulties, ensuring the progress of the project. The team independently developed a dedicated lifting system, which uses the collaborative effect of components such as balancing beams, lifting beams, lifting adapters, and basket screws to finely adjust the level of the lifting. At the same time, multi-station laser trackers were used to monitor reference points in real-time, dynamically adjusting the lifting posture, and finally achieving the millimeter-level precise positioning and installation of the DUV base.
The manufacturing and delivery of the DUV base, as well as its positioning and assembly, have laid a solid foundation for the subsequent installation and debugging of core components of the BEST device. Next, the BEST team will carry forward the spirit of the fully superconducting tokamak large scientific team, spare no effort to promote the installation of the device components, and ensure the timely and high-quality completion of the construction goals of the BEST device.
DUV base positioning
DUV base transfer
Original article: https://www.toutiao.com/article/7556102128280863268/
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