Ultra high molecular weight polyethylene: Optical features at millimeter wavelengths

D’Alessandro, G.; Paiella, A.; Coppolecchia, A.; Castellano, M. G.; Colantoni, I.; Bernardis, P. de; Lamagna, L.; Masi, S.

doi:10.1016/j.infrared.2018.02.008

Cited by 27 publications

(22 citation statements)

References 26 publications

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“…contained inside a cryostat that is cooled down to 4K using pulse-tubes. The microwave signals to be measured enter the cryostat through a 45 cm diameter window made of ultra-high molecular weight polyethylene [41] that provides excellent transmission and mechanical stiffness. After the window, filters ensure a low thermal load inside the cryostat.…”

Section: Bounds On Primordial Gravitational Wavesmentioning

confidence: 99%

QUBIC: Observing the Polarized Microwave Sky over the Puna

Cosmology¹

2020

scirevfew

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QUBIC (Q&U Bolometric Interferometer for Cosmology) is an experiment designed to measure the polarization of the cosmic microwave background (CMB), the relic radiation from the Big- Bang. Detailed measurements of tiny temperature anisotropies in the CMB shaped our understanding of the early Universe. Accurate measurements of its polarization may reveal even earlier features, in particular the presence of gravitational waves with primordial origin. Such measurements can probe inflationary cosmological models, which postulate that quantum effects during an accelerated expansion at the earliest stages after the Big-Bang produced gravitational waves along with the density fluctuations that later seeded galaxy formation. QUBIC will join other international efforts currently pursuing this goal using a novel approach, which combines the sensitivity of bolometric detectors with the control of systematic effects provided by interferometry. After its current calibration phase is completed a technological demonstrator already constructed in European laboratories will be deployed in Alto Chorrillos, a site in the Puna near San Antonio de los Cobres, Salta, Argentina. The complete first module of the instrument is planned to be installed during 2020. We review the scientific goals of the project, the instrument design and its expected performance.

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Section: Bounds On Primordial Gravitational Wavesmentioning

confidence: 99%

QUBIC: Observing the Polarized Microwave Sky over the Puna

Cosmology¹

2020

scirevfew

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“…The signal from the sky enters the cryostat vacuum through a 40 cm clear aperture window, fabricated from ultra high molecular weight (UHMW) polyethylene (PE). 6 A series of single-layer metal-mesh element low-pass filters are stacked at 300 K, 40 K and 4 K to minimise radiative thermal loading on the cold stages by sequentially rejecting short wavelength radiation.…”

Section: Instrument Architecturementioning

confidence: 99%

“…A cylindrical slab (560 mm diameter, 20 mm thick) of PE has been used to meet the structural requirement whilst providing excellent mm-wave transmission. 6…”

Section: Vacuum Chambermentioning

confidence: 99%

Thermal architecture for the QUBIC cryogenic receiver

May¹,

Chapron²,

Coppi³

et al. 2018

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

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QUBIC, the QU Bolometric Interferometer for Cosmology, is a novel forthcoming instrument to measure the B-mode polarization anisotropy of the Cosmic Microwave Background. The detection of the B-mode signal will be extremely challenging; QUBIC has been designed to address this with a novel approach, namely bolometric interferometry. The receiver cryostat is exceptionally large and cools complex optical and detector stages to 40 K, 4 K, 1 K and 350 mK using two pulse tube coolers, a novel 4 He sorption cooler and a double-stage 3 He/ 4 He sorption cooler. We discuss the thermal and mechanical design of the cryostat, modelling and thermal analysis, and laboratory cryogenic testing.

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“…The cryostat window is made from a cylindrical section (20 mm thick) of ultra high molecular weight polyethylene (UHMW PE) 12 . UHMW PE was chosen as the best compromise between transparency at millimetre waves and the stiffness required to withstand the large force from atmospheric pressure.…”

Section: Quasi-optical Components (Hwp Polariser Filters and Dichroic) Windowmentioning

confidence: 99%