Panel gap cover for millimetre-wave antenna

Padin, S.; Carlstrom, J. E.; Chauvin, Eric; Busetti, S.

doi:10.1049/el:20081388

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…We expect the AR coating seams will cause sidelobes in the SPT beam because they will appear as mm scale discontinuities at the primary reflector. The primary reflector itself is composed of 218 panels separated by ∼1 mm gaps, which are filled by low-profile beryllium-copper spring flanges [19][20][21]. These discontinuities are known to cause sidelobes due to scattering, and their effects on the PSF have been simulated.…”

Section: Coating Design and Fabricationmentioning

confidence: 99%

Broadband, millimeter-wave antireflection coatings for large-format, cryogenic aluminum oxide optics

Nadolski,

Vieira,

Sobrin

et al. 2019

Preprint

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We present two prescriptions for broadband (∼77-252 GHz), millimeter-wave antireflection coatings for cryogenic, sintered polycrystalline aluminum oxide optics: one for large-format (700 mm diameter) planar and plano-convex elements, the other for densely packed arrays of quasi-optical elements, in our case 5 mm diameter half-spheres (called "lenslets"). The coatings comprise three layers of commercially-available, polytetrafluoroethylene-based, dielectric sheet material. The lenslet coating is molded to fit the 150 mm diameter arrays directly while the large-diameter lenses are coated using a tiled approach. We review the fabrication processes for both prescriptions then discuss laboratory measurements of their transmittance and reflectance. In addition, we present the inferred refractive indices and loss tangents for the coating materials and the aluminum oxide substrate. We find that at 150 GHz and 300 K the large-format coating sample achieves (97 ± 2) % transmittance and the lenslet coating sample achieves (94 ± 3) % transmittance.

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Section: Coating Design and Fabricationmentioning

confidence: 99%

Broadband, millimeter-wave antireflection coatings for large-format, cryogenic aluminum oxide optics

Nadolski,

Vieira,

Sobrin

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Submillimeter Telescopes

Phillips

Padin

Žmuidzinas

2013

Planets, Stars and Stellar Systems

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The 10 Meter South Pole Telescope

Carlstrom¹,

Ade²,

Aird³

et al. 2011

Publications of the Astronomical Society of the Pacific

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586

383

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The South Pole Telescope (SPT) is a 10 m diameter, wide-field, offset Gregorian telescope with a 966-pixel, multi-color, millimeter-wave, bolometer camera. It is located at the Amundsen-Scott South Pole station in Antarctica. The design of the SPT emphasizes careful control of spillover and scattering, to minimize noise and false signals due to ground pickup. The key initial project is a large-area survey at wavelengths of 3, 2 and 1.3 mm, to detect clusters of galaxies via the Sunyaev-Zeldovich effect and to measure the small-scale angular power spectrum of the cosmic microwave background (CMB). The data will be used to characterize the primordial matter power spectrum and to place constraints on the equation of state of dark energy. A second-generation camera will measure the polarization of the CMB, potentially leading to constraints on the neutrino mass and the energy scale of inflation.Comment: 47 pages, 14 figures, updated to match version to be published in PASP 123 903 (May, 2011

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Panel gap cover for millimetre-wave antenna

Cited by 4 publications

References 4 publications

Broadband, millimeter-wave antireflection coatings for large-format, cryogenic aluminum oxide optics

Broadband, millimeter-wave antireflection coatings for large-format, cryogenic aluminum oxide optics

Submillimeter Telescopes

The 10 Meter South Pole Telescope

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