Reflectivity of Metals in the Millimeter Wavelength Range at Cryogenic Temperatures

Serov, E. A.; Паршин, В.В.; Bubnov, G. M.

doi:10.1109/tmtt.2016.2609411

Cited by 18 publications

(7 citation statements)

References 14 publications

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“…When Al is cooled down to cryogenic temperature, experimental results highlight discrepancies with respect to the purely theoretical model, even when anomalous skin depth is considered. In the case of pure Al, below 150K, the Reflection Loss drops much smoother than predicted, showing an almost linear decrement down to 40K, and constant behaviour at lower temperature (plot 10 in [20]); the measured Reflection Loss exceded the theoretical value by about 65%. Data can be fit with high accuracy (R=0.997) by a 4th order polynomial fit.…”

Section: Resultsmentioning

confidence: 69%

“…16 In-flight Reflection Loss at 40K compared to data from [1]. They are respectively shown: experimental data from ground test @296 K (asterisc); experimental data from ground test @110 K; Experimental data from LFI in-Flight measurement (this work) at 40K (cross) count the experimental evidences described in [20], where the case of mirrors of highly pure aluminum (99.99% Al) was investigated at fixed frequency f = 150 GHz. When Al is cooled down to cryogenic temperature, experimental results highlight discrepancies with respect to the purely theoretical model, even when anomalous skin depth is considered.…”

Section: Resultsmentioning

confidence: 93%

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In-flight measurement of Planck telescope emissivity

Cuttaia,

Terenzi,

Morgante

et al. 2018

Preprint

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The Planck satellite in orbit mission ended in October 2013. Between the end of Low Frequency Instrument (LFI) routine mission operations and the satellite decommissioning, a dedicated test was also performed to measure the Planck telescope emissivity. The scope of the test was twofold: i) to provide, for the first time in flight, a direct measure of the telescope emissivity; and ii) to evaluate the possible degradation of the emissivity by comparing data taken in flight at the end of mission with those taken during the ground telescope characterization. The emissivity was determined by heating the Planck telescope and disentangling the system temperature excess measured by the LFI radiometers. Results show End of Life (EOL) performance in good agreement with the results from the ground optical tests and from in-flight indirect estimations measured during the Commissioning and Performance Verification (CPV) phase. Methods and results are presented and discussed.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 93%

In-flight measurement of Planck telescope emissivity

Cuttaia,

Terenzi,

Morgante

et al. 2018

Preprint

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“…5 The reflectors, as well as the frame, were made of aluminum (A6061). In this study, we regarded aluminum as a perfect reflector, whose reflectivity does not depend on the frequency and the temperature; we estimate that the reflectivity of aluminum 31,32 affects the polarization angles only at a few arcseconds level. Outside the reflectors, we attached millimeter-wave absorbers (Laird Technologies Eccosorb AN-72 33 ) to reduce undesirable reflections.…”

Section: Scaled Antenna Of the Litebird Low-frequency Telescopementioning

confidence: 99%

Wide-field polarization angle measurements of a LiteBIRD low-frequency telescope scaled antenna

Takakura

Sekímoto

Inatani

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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LiteBIRD is a space mission intended for the late 2020s that aims to observe the large-angular-scale polarization pattern of the cosmic microwave background. The lowfrequency telescope (LFT) aboard LiteBIRD has a crossed-Dragone design and observes at 34 to 161 GHz with a field of view (FoV) of 18 deg × 9 deg. The LFT antenna optics is predicted to induce polarization angle rotation by up to around 1.5 deg in its FoV, while polarization angles among the detectors should be corrected to a few arcminutes level to distinguish Eand B-mode polarizations. To characterize the polarization angle rotation by the antenna optics and to develop a ground calibration method, we performed polarization angle measurements with a small compact-antenna-test-range setup. We measured the polarization angles of a 1/4-scaled LFT antenna across the FoV at correspondingly scaled frequencies of 140 to 220 GHz (35 to 55 GHz for the full-scale LFT). We placed a collimated-wave source near the scaled-LFT aperture and rotated the scaled-LFT feed polarization. The measured polarization angles agree with those measured by rotating the collimated-wave polarization at the 15″ level for the on-axis case. The measurements are consistent with simulation and determined the polarization angles with an uncertainty of less than 1.9′.

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“…This impacts the results; an example is found in [38], where an Al alloy was used, thus leading to a lower Q. The following references are informative: [1], [3], and [39].…”

Section: Planck Reflector Materialsmentioning

confidence: 99%

On the Reflectivity of Materials for Radio Telescope and Space Antenna Applications: Antenna reflector loss needs to be known for many specific antenna applications

Klooster

Паршин

Serov

et al. 2023

IEEE Antennas Propag. Mag.

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Reflectivity of Metals in the Millimeter Wavelength Range at Cryogenic Temperatures

Cited by 18 publications

References 14 publications

In-flight measurement of Planck telescope emissivity

In-flight measurement of Planck telescope emissivity

Wide-field polarization angle measurements of a LiteBIRD low-frequency telescope scaled antenna

On the Reflectivity of Materials for Radio Telescope and Space Antenna Applications: Antenna reflector loss needs to be known for many specific antenna applications

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