Research Of Assembly And Welding Key Technologies On Future Fusion Reactor Double-wall Vacuum Vessel Sectors

Effective use of fusion energy is one of important ways to maintain sustainable development for human.The China Fusion Engineering Test Reactor(CFETR)is the next-generation fusion experimental device planned for construction in China,which will establish a key engineering technology foundation for China's independent development and construction of magnetic confinement fusion reactor.The double-wall vacuum vessel(VV),as the core component of magnetic confinement fusion reactor,has the functions of providing stable operation environment and neutron shielding for plasma.Owing to the large scale and tight manufacturing tolerances of VV,Institute of Plasma Physics Chinese Academy of Science(ASIPP)has carried out research on a full-size 450 °VV(1/8 sector)to develop and demonstrate the fabrication technologies of double-wall VV.The purpose of this dissertation is to slove the difficulties of measurement,machining,assembly,welding deformation,etc.in the manufacturing process of VV by completing the manufacture of 1/32 and 1/16 sectors,and to provide strong technical support for the construction of 1/8 sector and the VW of CFETR.This study take 1/32 and 1/16 sectors as the research object.High-precision machining of PS(Poloidal Segment)and 1/32 sector ends' grooves is completed by using the technologies of reverse engineering and laser tracker measurement.Based on the theory of inherent theory,the welding deformation analysis of 1/32 and 1/16 sectors is completed by ABAQUS software,and the welding deformation of sectors is reduced by using welding fixtures and reserving anti-deformation.A set of modular flexible assembly tooling system is designed.The laser tracker is used to complete the high-precision assembly positioning and welding deformation measurement of sectors.By improving the basic algorithm of iterative closest point,the best fitting of the measurement data and the design model of sectors is completed.Based on the results of finite element analysis and measurement verifaction,the methods of temperature compensation for VV with or without the reference points are proposed.At present,the manufacturing of 1/32 sector and 1/16 sector has been completed,and the dimensional accuracy meets the design requirements,which provides technical reserve and engineering experience for the follow-up manufacturing of 1/8 sector and the VV of CFETR.