Wide-field-of-view millimeter-wave telescope design with ultra-low cross-polarization

Bernacki, Bruce E.; Kelly, James Floyd; Sheen, David M.; Hatchell, Brian K.; Valdez, Patrick Lj; Tedeschi, Jonathan R.; Hall, Thomas; McMakin, Douglas L.

doi:10.1117/12.917773

Cited by 4 publications

(4 citation statements)

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“…Possible paths of straylight increase with a wider FoV. After various trade-off studies of various optical configurations, including a front-fed Dragone [176], we concluded that the crossed-Dragone antenna is the best option for LFT, because it has good beam and polarization performance over the required FoV.…”

Section: Optical Designmentioning

confidence: 89%

Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey

Allys

Arnold

Aumont

et al. 2022

Progress of Theoretical and Experimental Physics

119

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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Section: Optical Designmentioning

confidence: 89%

Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey

Allys

Arnold

Aumont

et al. 2022

Progress of Theoretical and Experimental Physics

119

108

View full text Add to dashboard Cite

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“…As a further study, although we have limited our discussion with the F number of 3.0 and the entrance pupil diameter of 400 mm in this paper, this optical design can be extended to other F number and the entrance pupil diameter when applied to a ground-based telescope. The design example with using SCS can be found in Bernacki et al [27].…”

Section: Discussionmentioning

confidence: 99%

Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

et al. 2018

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A side-fed crossed Dragone telescope provides a wide field of view. This type of telescope is commonly employed in the measurement of cosmic microwave background polarization, which requires an image-space telecentric telescope with a large focal plane over broadband coverage. We report the design of a wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces with correction terms up to the 10th order. We achieved a Strehl ratio larger than 0.95 over 32×18 square degrees at 150 GHz. This design is an image-space telecentric and fully diffraction-limited system below 400 GHz. We discuss the optical performance in the uniformity of the axially symmetric point-spread function and telecentricity over the field of view. We also address the analysis to evaluate the polarization properties, including the instrumental polarization, extinction rate, and polarization angle rotation. This work is a part of a program to design a compact multi-color wide-field-of-view telescope for LiteBIRD, which is a next-generation cosmic microwave background (CMB) polarization satellite.

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“…After trade-off studies of various optical configurations among crossed-Dragone, offset-Gregorian, 23 and open-Dragone, 24,25 we concluded that the crossed-Dragone antenna is the best option for LFT because of the wide-field of view and the low cross polarization. Multiple reflections of crossed-Dragone antennas have been described earlier.…”

Section: Antenna Designmentioning

confidence: 91%

Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD

Sekímoto

Ade

Adler

et al. 2020

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X

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LiteBIRD has been selected as JAXA's strategic large mission in the 2020s, to observe the cosmic microwave background (CMB) B-mode polarization over the full sky at large angular scales. The challenges of LiteBIRD are the wide field-of-view (FoV) and broadband capabilities of millimeter-wave polarization measurements, which are derived from the system requirements. The possible paths of stray light increase with a wider FoV and the far sidelobe knowledge of −56 dB is a challenging optical requirement. A crossed-Dragone configuration was chosen for the low frequency telescope (LFT : 34-161 GHz), one of LiteBIRD's onboard telescopes. It has a wide field-of-view (18 • × 9 • ) with an aperture of 400 mm in diameter, corresponding to an angular resolution of about 30 arcminutes around 100 GHz. The focal ratio f/3.0 and the crossing angle of the optical axes of 90 • are chosen after an extensive study of the stray light. The primary and secondary reflectors have rectangular shapes with serrations to reduce the diffraction pattern from the edges of the mirrors. The reflectors and structure are made of aluminum to proportionally contract from warm down to the operating temperature at 5 K. A 1/4 scaled model of the LFT has been developed to validate the wide field-of-view design and to demonstrate the reduced far sidelobes. A polarization modulation unit (PMU), realized with a half-wave plate (HWP) is placed in front of the aperture stop, the entrance pupil of this system. A large focal plane with approximately 1000 AlMn TES detectors and frequency multiplexing SQUID amplifiers is cooled to 100 mK. The lens and sinuous antennas have broadband capability. Performance specifications of the LFT and an outline of the proposed verification plan are presented.

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Wide-field-of-view millimeter-wave telescope design with ultra-low cross-polarization

Cited by 4 publications

References 0 publications

Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey

Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey

Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD

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