Thermodynamic modeling and mechanistic study of large-aperture ADP crystal components under thermal-fluid-structural multiphysics coupling

Abstract

Large-aperture ADP crystals play a crucial role in high-power laser systems such as inertial confinement fusion (ICF). This study primarily investigates the thermodynamic issues caused by thermal-fluid–solid coupling during the thermal structural design of crystal components. To address this, an analysis model of thermal-fluid–solid coupling for large-aperture ADP crystal components was developed, tailored to the working characteristics of crystal components in ICF devices. The heat transfer characteristics were studied through numerical simulations and experimental verification, revealing the relationship between crystal surface deformation and various physical fields. The results indicate that vortices in the flow field within the heating cavity cause variations in the temperature field, with relatively minor temperature gradients in the core region. These temperature gradients are crucial in forming internal thermal stress within the crystal. This thermal stress, combined with clamping forces, leads to deformation of the crystal surface, thereby affecting its optical performance. Variance analysis indicates that the effects of clamping stress, temperature gradient, and posture conditions on the PV value decrease sequentially, with contribution rates of 54.0 %, 20.0 %, and 26.0 %, respectively. The findings of this study are significant for refining the thermal structural design theory of large-aperture crystal components and advancing the development in ICF devices.