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In the context of the experiments to be carried out at the fast X-ray tomography and radioscopy beamline (FAXTOR-BL31) of the ALBA synchrotron, a Fast Periodic Shutter (FPS) is being designed. Its purpose is to prevent a high dose rate on the sample and to provide synchronization with the acquisition protocol. This FPS is based on the combination of tungsten blades driven by a servomotor.
This work details the FEA-CFD numerical simulations (ANSYS) developed for the FPS's thermo-mechanical design. Models considered steady-state and transient (periodic) conditions. Initial steady-state analysis (under vacuum) quantified baseline mechanical stress. Subsequently, a coupled CFD approach modeled the cooling gas and forced convection effects. The thermal modeling incorporated combined synchrotron radiation and Stefan-Boltzmann radiation modeling.
The main objective of these simulations is to quantify the resulting thermo-mechanical stress and temperature distribution to ensure the structural integrity of the blades. Complementarily, the influence of air resistivity on rotor performance and the temperature dynamic considering air cooling and periodic radiation were examined.
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