The European Spallation Source (ESS) has selected, as primary option, a rotating tungsten helium-cooled target (ROTHETA). The target is designed as a wheel and the tungsten is installed into 33 sectors. Given the strongly non-uniform nuclear heat generation by beam pulses (14Hz with a pulse length of 2.86ms), the spallation material has arranged to ensure a proper cooling and avoid large temperature gradients within the target material as well as in the target beam entrance window and wheel shroud. Since the operating pressure is low (0.3MPa) the pressure loss within the target wheel has been minimized in order to keep the pumping power within reasonable limits. This paper presents the steady-state and transient thermo-hydraulic analysis of the current target layout with focus on the minimization of pressure losses and optimization of, the temperature field within a target sector. Using the results from CFD calculations, a stress analysis of the mechanical stresses in the target cover is going to be presented afterwards. In the closer of this paper, the dynamic behaviour of the whole target is simulated using a RELAP5-3D model.
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