Fatigue based design and thermo- mechanical analysis of heat transfer element (HTE) for second calorimeter of Indian Test Facility (INTF)

摘要

Highlights•To meet the functional requirement of second calorimeter a V shaped curvilinear design concept is proposed.•A detailed FE analyses for normal operational condition on worst loading heat transfer element (HTE) is performed.•Furthermore, it is validated with the standard structural verification SDC-IC criteria.•The design of HTE is modified to meet the required number of thermal cycles (Fatigue cycles).AbstractIndian Test Facility (INTF) is a test bed to characterize ITER Diagnostic Neutral Beam (DNB) system, is being constructed at ITER-India, IPR . The operation is aimed to generate 18–20A of 100KeV, hydrogen neutral beam with a 3s ON/20s OFF duty cycle at 5Hz modulation. The final focused beam will be characterized on a beam dump or a heat sink system named Second Calorimeter (SC), situated at a distance of 20.66m from the Grounded Grid (GG) of the Beam Source (BS). It is designed to withstand a total beam power or heat load of 2.84MW, corresponding peak heat flux is∼93.15MW/m2and the required number of thermal cycle of 6.13×104. To handle such high heat flux, a V shaped design is adopted with a suitable apex angle. In INTF, First Calorimeter (FC) is placed just after Residual Ion Dump (RID) at a distance 5.95m from the GG of BS .In the present work a heat absorbing building block called hypervapotron was adopted from and modified to meet the above mentioned heat load requirements. The paper presents the conceptualization of SC and a thermo-mechanical assessment of the heat transfer element by Finite Element method (FE), carried out using ANSYS. FE results are used to validate the HTE design as per StructuralDesignCriteria for In vessel Component (SDC-IC) for monotonic as well as cycling loading (Fatigue) damage criteria. This paper also reports the key challenges and usual solutions adopted in the design.