Abstract Indian Test Facility (INTF) is a test bed to characterize ITER Diagnostic Neutral Beam (DNB) system, is being constructed at ITER-India, IPR [1] . The operation is aimed to generate 18–20 A of 100 KeV, hydrogen neutral beam with a 3 s ON/20 s OFF duty cycle at 5 Hz 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 20.66 m 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/m2 and 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 5.95 m from the GG of BS [2] . In the present work a heat absorbing building block called hypervapotron was adopted from [3] 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 Structural Design Criteria 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.
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