Design And Analysis Of Vacuum Barrier For ITER CC Feeder Cryostat Feeder Through

The Cryostat Feeder Through (CFT) for CC coils is an important subsystem of ITER (International Thermonuclear Experimental Reactor), which is an channel for Feeder system passing through the Bio-shield. Three vital functions:power supply to the magnet, supercritical helium supply for the magnet and instrumentation wire routing are performed by CFT. The Vacuum Barrier (VB) is a subassembly with responsibility for separating the Feeder vacuum and the machine vacuum in the CFT system. Due to the especial working condition and complicated interfaces, its quality of design and manufacture will directly affect the operation of the Feeder system.To ensure that the structure is not only reasonable and reliable but also can provide academic support and design experiences for other feeders, structure design for VB and analysis for its critical parts is needed.The main intention of this thesis is to explore the design technique and theory for VB and its related assembly according to the requirements of structure feature and operation principle. FEA technique is utilized considering the work condition (high vacuum, high voltage, ultralow temperature) of ITER CC Feeder to analyze the structure intensity of the double-wall heat insulation shell and the cooling process of the whole VB structure, the heat load, temperature and thermal stress distribution of theVB is obtained. Meanwhile, base on the cooling scheme, the stress assessment of the whole VB structure was finally accomplished by applying loads in individual steps.