Design And Analysis For Coil Terminal Box Of ITER Toroidal Field Magnet Superconductive Feeder System

International Thermonuclear Experimental Reactor (ITER) is an unprecedented international collaboration program. Its aim is to build a large-scale superconducting tokamak. As one important part of ITER feeder system, coil terminal box (CTB) is mainly to offer an interface and shielding safeguard for the connections between the ducts, pipes, lines of the magnet feeder system and the cryo-plant, the current source hall, the data collection system respectively. The structural design and manufacturing quality of CTB will directly affect the normal operation of TF feeder, and what is more, it will also affect the running of ITER.Firstly, the thesis introduces the study condition of fusion energy home and abroad, as well as ITER scheme and its main structures briefly. Secondly, according to the requirements of the project, the thesis states the structural design criterion of TF feeder system, and conceptual designs for some important parts of TF feeder CTB has been finished, including the chamber, internal pipes, vacuum barrier, overpressure release valve, pressure tapings feedthru, thermal shield and some internal auxiliary supports. The design relates to the mechanism, cryo conduction, electromagnetics, vacuum theory, materialogy and many other subjects of knowledge. Thirdly, the structural design of CTB chamber, vacuum barrier and internal supports are states in detail. And based on the actual operation condition of TF feeder CTB, a series of overall check are carried out for the key parts with the help of FEA technique, thus the achieved results of stress and displacement distribution provide theoretical basis for the determination or further optimization of the structures. The analytical results show the designs about CTB chamber, supports for thermal shield and current lead are all reasonable. And from the structural analysis for the vacuum barrier, we can see that the contraction of cooling pipes will result in overproof stress at the bottom of the vacuum barrier. To decrease the stress, a length of bend pipes is added to the cooling pipes for absorbing cold shortening, which is also proved in further FEA. The key design of vacuum barrier is jacket, because it can cut down the conductive heat and radiant heat from outer environment to the internal helium tubes by increasing the heat transfer routes. The thermal analysis of vacuum barrier also demonstrates the feasibility of the jacket design. The research results of the thesis provide the foundation of developing CTB, supply experiences for the designs and analyses of other feeder CTBs, ans help ITER make the operation of CTB reliable as soon as possible.