Finite-element modelling of multilayer X-ray optics

Area of Science:

• Optics and Photonics
• Materials Science
• Computational Physics

Background:

• Multilayer optical elements are crucial for hard X-ray applications requiring high photon flux and moderate energy resolution.
• Accurate thermal and structural analysis is essential for designing effective cooling schemes and optimizing multilayer optics.
• Traditional finite-element analysis (FEA) models face computational challenges due to the high aspect ratio and numerous layers in multilayer optics.

Purpose of the Study:

• To develop an efficient finite-element analysis (FEA) model for thermal-structural analysis of multilayer X-ray optics.
• To overcome the computational limitations of existing FEA models for multilayer optics with high aspect ratios.
• To enhance the feasibility of simulating complex multilayer optical elements on current computing hardware.

Main Methods:

• Implementation of a thermal-structural FEA model using ANSYS layer-functioned elements.
• Addressing the challenge of meshing thin layers within thick substrates in FEA models.
• Developing a computational approach suitable for multilayer optics with hundreds of nanometer-thick periods.

Main Results:

• A significantly increased number of layers can be computed within the limits of presently available computers.
• The developed FEA model provides a viable method for predicting temperature, strain, and stress distributions.
• Overcomes the prohibitive element count and poor element shape ratios of traditional FEA approaches.

Conclusions:

• The novel FEA model using layer-functioned elements substantially improves the computational efficiency for analyzing multilayer X-ray optics.
• This advancement facilitates better design and optimization of multilayer optics for demanding X-ray applications.
• Enables more accurate thermal-structural predictions for multilayer optics, previously computationally intractable.