Multilayer coating design methods for a high-energy x-ray imaging optic with complex design requirements

Chris C. Walton; Bernard Kozioziemski; Jeffrey R. Fein; Suzanne E. Romaine; Julia K. Vogel

doi:10.1117/12.2633400

4 October 2022 Multilayer coating design methods for a high-energy x-ray imaging optic with complex design requirements

Chris C. Walton, Bernard Kozioziemski, Jeffrey R. Fein, Suzanne E. Romaine, Julia K. Vogel

Proceedings Volume 12240, Advances in X-Ray/EUV Optics and Components XVII; 1224005 (2022) https://doi.org/10.1117/12.2633400
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

Imaging of x-rays with energies >15 keV is a necessity for several applications in high-energy density physics experiments. Multilayer-coated, Wolter-type glancing-incidence optics offer higher collection efficiency than pinhole cameras or Kirkpatrick-Baez style mirrors, and can achieve spatial resolution of 10-100um over 1-8 mm fields of view with throughput ~ 1-10%. Designing the multilayer coating is a complex optimization problem, involving multiple tradeoffs. A narrow energy bandwidth (~1keV) is desirable to exclude background, but a broad angular acceptance is desirable for the optic to image a large field (~1-8 mm). A Wolter optic’s net reflectivity is two-bounce R² = R₁*R₂ for a wide range of pairs of incidence angles θ₁, θ ₂. In addition, the multilayer coating can be modified in several ways, such as varying the period thickness through the stack, and along the length of the optic. Parallelized searches using ordinary gradient-descent and Markov-Chain Monte Carlo (MCMC) have been applied to design an optic to image Z-pinch plasmas on the Z Machine at Sandia National Laboratories. Methods are tested to design an appropriate cost function for this search, and to reduce computational cost to search the parameter space efficiently.

Conference Presentation

Citation Download Citation

Chris C. Walton, Bernard Kozioziemski, Jeffrey R. Fein, Suzanne E. Romaine, and Julia K. Vogel "Multilayer coating design methods for a high-energy x-ray imaging optic with complex design requirements", Proc. SPIE 12240, Advances in X-Ray/EUV Optics and Components XVII, 1224005 (4 October 2022); https://doi.org/10.1117/12.2633400

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