成功安装就位！

Core Viewpoint - The successful installation of the Dewar base marks a significant milestone in the construction of the BEST project, advancing the main engineering phase and accelerating the progress of component manufacturing and installation [1][5]. Group 1: Installation Details - The Dewar base is the first vacuum large component of the BEST device, with a diameter of approximately 18 meters, a height of about 5 meters, and a total weight exceeding 400 tons [1]. - The installation precision of the Dewar base is critical, requiring a surface level difference to be controlled within 15 millimeters and a positional deviation not to exceed ±2 millimeters [3]. - The installation space is extremely limited, with a minimum gap of less than 100 millimeters between the outer edge of the base and the shielding wall of the main pit [3]. Group 2: Technical Achievements - The Dewar base was developed by a project team led by the Hefei Institute of Plasma Physics, which overcame key technologies such as high-precision forming and welding, millimeter-level deformation control, and high vacuum sealing [5]. - The successful manufacturing and installation of the Dewar base lays a solid foundation for the subsequent installation and debugging of core components of the BEST device [5]. Group 3: Project Overview - The BEST (Burning Experimental Superconducting Tokamak) is a compact fusion energy experimental device that aims to validate the feasibility of fusion energy generation in a real fuel environment by 2025 [6]. - The project is expected to be completed within two years, with the goal of demonstrating fusion energy generation by 2025 and potentially lighting the first lamp with nuclear fusion by 2030 [6].