Analysis And Optimization Of Poloidal Field Magnet Feeder Systems Supercritical Helium Pipe For ITER

Nuclear fusion experimental reactor is the trend of nuclear power development. ITER (International Thermonuclear Experimental Reactor) is an international research and development project which aims to demonstrate the scientific and technical feasibility of fusion power. The feeder is an important part of the ITER, which to transmit current, liquid helium and instrumentation cables. Therefore, the feeder system plays a decisive role in the superconducting magnet coil whether the normal operation. Main works of this paper are as follows.(1) Firstly, the research status of controlled nuclear fusion and the main structure of the tokamak working principle are introduced. The ITER plan and the ITER device are introduced too. Secondly, ITER magnet feeder system and the feeder system of the ITER poloidal field are introduced. There are31different sets of magnet feeders in ITER, including six poloidal field magnet coil feeder (PF).(2) The basic concepts and steps of the finite element analysis is introduced in this paper. The basic concept of the finite element method is to put the object discretized into finite and certain interconnected with a combination of unit, to simulate or close to the original object. The basic mechanical equation of finite element analysis such as equilibrium equation, geometric equation and physical equation are expounded. The basic theory of optimization design and common analysis software ANSYS and HyperMesh are introduced.(3) According to the requirements of engineering and physics, the design criteria, stress evaluation criterion and materials selection criteria of the poloidal field magnet feeder system are presented in this paper. In this paper, the design of pipe supports, helium pipe and internal support have been described in detail.(4) Three-dimensional model of helium tube and its support are established in CATIA software. Frictional contact is established between the helium tube and the support. The analysis result shows that the stress of No.1helium pipe and No.3helium pipe is less than the allowable stress, to meet the use requirements. The maximum stress of the No.2helium pipe exceeds the allowable stress. Therefore need to optimize the design to meet the requirements. (5) In the structural optimization of the helium pipe, thickness is selected as the input parameters. Maximum stress is selected as the output parameter. All of the requirements have been perfectly satisfied by the optimized structure.