Damage simulation due to heat load from X-ray FEL beam at European XFEL

In the X-ray FEL beam transport system, the optic components which have direct contact with the beam, e.g. mirror, absorber and beam shutter, etc., could exceed 10 kW peak heat load on a sub-mm spot. Therefore, the thermo-mechanical performance of these components under the extreme high heat load will limit the maximum allowed pulses for the safety operation of the facility. In this contribution, a selection of multi-scale and multi-physics numerical models using finite element tools is introduced to describe the interaction of X-ray laser beam with different materials, taking into consideration of the multi-coupling of heat transfer, solid mechanics, fluid dynamics and phase transitions. The verified and validated models can be referred to define damage threshold of the optic components, and to virtually reproduce the damage mechanism of the materials.