Modeling sidelobe response for ground-based mm-wavelength telescopes with the geometrical theory of diffraction

Alexandre E. Adler; Jon E. Gudmundsson

doi:10.1117/12.2576309

13 December 2020 Modeling sidelobe response for ground-based mm-wavelength telescopes with the geometrical theory of diffraction

Alexandre E. Adler, Jon E. Gudmundsson

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114534O (2020) https://doi.org/10.1117/12.2576309
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Accurate optical modeling is important for the design and characterisation of current and next-generation experiments studying the Cosmic Microwave Background (CMB). Geometrical Optics (GO) cannot model diffractive effects. In this work, we discuss two methods that incorporate diffraction, Physical Optics (PO) and the Geometrical Theory of Diffraction (GTD). We simulate the optical response of a ground-based two-lens refractor design shielded by a ground screen with time-reversed simulations. In particular, we use GTD to determine the interplay between the design of the refractor’s forebaffle and the sidelobes caused by interaction with the ground screen

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Alexandre E. Adler and Jon E. Gudmundsson "Modeling sidelobe response for ground-based mm-wavelength telescopes with the geometrical theory of diffraction", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114534O (13 December 2020); https://doi.org/10.1117/12.2576309

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