Simulating the effects of thermoelastic deformation on the THESEUS Soft X-ray Imager optics

S. Svendsen, E. B. Knudsen, S. Blake, T. Oosterbroek, A. S. Jegers, D. D. M. Ferreira, T. Prod'hommec, B. Shortt, R. Willingale, P. O'Brien

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We present a ray tracing simulation of the Soft X-ray Imager (SXI) optics for the THESEUS observatory using the open-source McXtrace software package. THESEUS is a candidate mission within the Cosmic Vision programme of the European Space Agency and is designed to monitor high-energy transient events in the entire sky, therefore relying on fast slewing of the spacecraft. This capability will however impose large temperature variations and gradients across the optics which can cause thermoelastic deformation of the Soft X-ray Imager microchannel optics. The purpose of this study is to evaluate the impact on the point spread function (PSF) due to in-orbit temperature variation. Based on thermal analysis of the Soft X-ray Imager, perturbations to the ideal microchannel geometry are derived and provided as input to the ray tracer.
Original languageEnglish
Title of host publicationProceedings of SPIE 11119, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX
EditorsStephen L. O'Dell, Giovanni Pareschi
Number of pages9
PublisherSPIE - International Society for Optical Engineering
Publication date2019
Article number111191R
Publication statusPublished - 2019
Event2019 SPIE Optical Engineering + Applications - San Diego, United States
Duration: 11 Aug 201915 Aug 2019


Conference2019 SPIE Optical Engineering + Applications
CountryUnited States
CitySan Diego
SeriesProceedings of SPIE, the International Society for Optical Engineering


  • Soft X-ray Imager
  • McXtrace
  • Ray tracing
  • Microchannel optics
  • Lobster eye optics
  • X-ray optics

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