Geometrical and physical optics analysis for mm-wavelength refractor telescopes designed to map the cosmic microwave background

Gudmundsson, J. E.

doi:10.1364/ao.387842

Cited by 4 publications

(2 citation statements)

References 52 publications

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“…Using this technique, we can predict the nominal beam response for the different frequency bands in the SO LAT. W e generate an ensemble of physical optics simulations using an application programming interface (API) that couples to TICRA Tools (formerly GRASP) [33]; a similar approach was described in [34,35]. 3 The physical optics simula- Fig.…”

Section: Physical Optics a Basic Model Setupmentioning

confidence: 99%

The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

Gudmundsson¹,

Gallardo²,

Puddu³

et al. 2021

Appl. Opt.

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We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope, allowing us to evaluate the impact of various design choices on performance metrics and potential systematic effects. The primary goal of the simulations was to evaluate the final design of the reflectors and the cold optics that are now being built. We describe nonsequential ray tracing used to inform the design of the cold optics, including absorbers internal to each optics tube. We discuss ray tracing simulations of the telescope structure that allow us to determine geometries that minimize detector loading and mitigate spurious near-field effects that have not been resolved by the internal baffling. We also describe physical optics simulations, performed over a range of frequencies and field locations, that produce estimates of monochromatic far-field beam patterns, which in turn are used to gauge general optical performance. Finally, we describe simulations that shed light on beam sidelobes from panel gap diffraction.

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Section: Physical Optics a Basic Model Setupmentioning

confidence: 99%

The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

Gudmundsson¹,

Gallardo²,

Puddu³

et al. 2021

Appl. Opt.

Self Cite

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“…A set of preliminary physical optics simulations, using simulation methodology described in Ref. 13, for this configuration have been performed to inform the first runs of time-domain simulations for the MHFT. These simulations provide estimates of main-beam far-field responses as well as spillover efficiencies for sensitivity calculations.…”

Section: Optical Designmentioning

confidence: 99%

Overview of the medium and high frequency telescopes of the LiteBIRD space mission

Montier

Mot

Bernardis

et al. 2020

Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave

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LiteBIRD is a JAXA-led Strategic Large-Class mission designed to search for the existence of the primordial gravitational waves produced during the inflationary phase of the Universe, through the measurements of their imprint onto the polarization of the cosmic microwave background (CMB). These measurements, requiring unprecedented sensitivity, will be performed over the full sky, at large angular scales, and over 15 frequency bands from 34 GHz to 448 GHz. The LiteBIRD instruments consist of three telescopes, namely the Low-, Mediumand High-Frequency Telescope (respectively LFT, MFT and HFT). We present in this paper an overview of the design of the Medium-Frequency Telescope (89-224 GHz) and the High-Frequency Telescope (166-448 GHz), the so-called MHFT, under European responsibility, which are two cryogenic refractive telescopes cooled down to 5 K. They include a continuous rotating half-wave plate as the first optical element, two high-density polyethylene (HDPE) lenses and more than three thousand transition-edge sensor (TES) detectors cooled to 100 mK. We provide an overview of the concept design and the remaining specific challenges that we have to face in order to achieve the scientific goals of LiteBIRD.

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Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey

Allys

Arnold

Aumont

et al. 2022

Progress of Theoretical and Experimental Physics

140

108

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LiteBIRD the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as a strategic large-class (L-class) mission, with an expected launch in the late 2020s using JAXA’s H3 rocket. LiteBIRD is planned to orbit the Sun-Earth Lagrangian point L2, where it will map the cosmic microwave background (CMB) polarization over the entire sky for three years, with three telescopes in 15 frequency bands between 34 and 448 GHz, to achieve an unprecedented total sensitivity of 2.2 μK-arcmin, with a typical angular resolution of 0.5○ at 100 GHz. The primary scientific objective of LiteBIRD is to search for the signal from cosmic inflation, either making a discovery or ruling out well-motivated inflationary models. The measurements of LiteBIRD will also provide us with insight into the quantum nature of gravity and other new physics beyond the standard models of particle physics and cosmology. We provide an overview of the LiteBIRD project, including scientific objectives, mission and system requirements, operation concept, spacecraft and payload module design, expected scientific outcomes, potential design extensions and synergies with other projects. Subject Index LiteBIRD cosmic inflation, cosmic microwave background, B-mode polarization, primordial gravitational waves, quantum gravity, space telescope

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Geometrical and physical optics analysis for mm-wavelength refractor telescopes designed to map the cosmic microwave background

Cited by 4 publications

References 52 publications

The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

Overview of the medium and high frequency telescopes of the LiteBIRD space mission

Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey

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