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Study on Qualification for Cold Mass Support of ITER FEEDER CFT


 Cold Mass Support (CMS) is a very important internal component of ITER Cryostat feedthrough (CFT), which acts as structure support who bears shear loads and sliding, as well as where heat load transfer from room temperature to 4.2K component. Base on the special functional requirements and importance, the design of CMS should be qualified before the real production used on ITER Feeder system. In this paper, the qualification process of CMS was studied, three kinds of qualification tests were done on CMS mockup and prototype, include structural mechanical strength test, sliding pad qualification tests, and thermal conductance test. Every testing process was introduced in detail, such as the load distribution of mechanical test, the setup of test platform, special test equipment and methods, etc. Some important performance parameters were obtained, such as the maximum deformation under mechanical load, the friction coefficient and some key performances of the Diamond-Like Carbon (DLC) coating, temperature gradient of CMS during cryogenic test, and so on. All these testing results could prove that the design of the CMS was satisfactory, and the qualification was successful.