Research On Structure Design And Finite Element Analysis Of The Vacuum Chamber For The Electron Positron Collider's Storage Ring

BEPCII is an upgrade project of the Beijing Electron-Positron Collider (BEPC). The vacuum chamber is one of the most important equipment of the BEPCII storage ring. The structure and the working environment of the vacuum chamber is complicated. Many problems have to be resolved in design before construction of the engineering project. The structure of the vacuum chamber must be designed in the first place which is the key of the vacuum system and effect the storage ring project and correlative project. The vacuum chamber of the storage ring will be made of aluminum alloy. Mechanical machining and welding will be adopted for it. Based on these, the paper emphasizes on the structure of the vacuum chamber. Aiming at this actuality, the author has studied some basic theories, key techniques about the structure and finite element analysis of the vacuum chamber. The author has accomplished the structure design, finite element analysis and optimizing structure for the vacuum chamber.The vacuum chamber is modeling with Inventor, and its Inventor model is used in ANSYS. The distortion, dynamic parameter and thermodynamics parameter, havebeen gotten by ANSYS. The analytic result is calculated which is used to optimize the design. It can save expense and time for test. Therefore, the results take a essential foundation for the structure design of the vacuum chamber. By analyzing and calculating, we can get reliable result.The main conclusions with theory and practice of the paper are as following:(1) The physical and vacuum analysis about storage ring vacuum chamber is carried out. It can provide theoretical basis for the vacuum chamber design. The design and calculation of the storage ring vacuum chamber have been satisfied with storage ring room, machining and technics of aluminum alloy ultrahigh vacuum in china. Based on the analysis of the vacuum chamber, the author ensure the scheme of design, material, machining, technics structure of it. On the basis of the theory and practice study mentioned above, the storage ring vacuum chamber of BEPCII is projected.(2) Employing finite element analysis method, the author studys the finite element method static. From those stress nephogram and the location of the most distortion is detailed. The distortion of the vacuum chamber which is roasted at 150 °C is obtained. So the cooperating size of the vacuum chamber are designed with other equipment in system.(3) We carry out the modal analysis of the vacuum chamber to make certain dynamic parameter which is inhere frequency and vibration.(4) The thermal-fluid coupled-field calculation and analysis of the vacuum chamber cooling cater is done. Based on the reality model and the result which is distributing of temperature, the author designs the cooling water channel. So the results take an essential foundation for the cooling channel design.(5) The analysis of temperature margin is done with the FEA. It is confirmed the range of fluctuating temperature. The results take a essential foundation for the structure design of the vacuum chamber.(6) The structure optimization is carried out based on the design of structure and FEA of the vacuum chamber. The optimizing model is established whose aim function is the least volume of the vacuum chamber. The vacuum chamber will becredibility and economizing. The optimizing result is important for the project.