Characterizing Atacama B-mode Search Detectors with a Half-Wave Plate
نویسندگان
چکیده
منابع مشابه
A Millimeter-Wave Achromatic Half Wave Plate
We have constructed an achromatic half wave plate (AHWP) suitable for the millimeter wavelength band. The AHWP was made from a stack of three sapphire a-cut birefringent plates with the optical axes of the middle plate rotated by 50.5 degrees with respect to the aligned axes of the other plates. The measured modulation efficiency of the AHWP at 110 GHz was 96 ± 1.5%. In contrast, the modulation...
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MAXIPOL was the first experiment to measure the polarization of the cosmic microwave background with a rotating half wave plate. We discuss the magnitude and sources for instrumental polarization and polarization rotation in the instrument.
متن کاملMillimeter-wave achromatic half-wave plate.
We have constructed an achromatic half-wave plate (AHWP) suitable for the millimeter wavelength band. The AHWP was made from a stack of three sapphire a-cut birefringent plates with the opticalaxes of the middle plate rotated by 50.5 deg with respect to the aligned axes of the other plates. The measured modulation efficiency of the AHWP at 110 GHz was 96 +/- 1.5%. In contrast, the modulation ef...
متن کاملThe Atacama B-mode Search: an experiment to measure the polarization of the cosmic microwave background at large angular scales
The Atacama B-mode Seach (ABS) is a new experiment to probe the inflationary epoch in the early universe by measurng the patterns of polarization anisotropy in the cosmic microwave background (CMB) at large angular scales. The polarization of the CMB observed on the celestial sphere can be described with a tensor field. Gravitational waves from inflation, if it occurred, lead to a pseudoscalar ...
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The Atacama B-mode Search (ABS) instrument, which began observation in February of 2012, is a crossed-Dragone telescope located at an elevation of 5,100 m in the Atacama Desert in Chile. The primary scientific goal of ABS is to measure the B-mode polarization spectrum of the Cosmic Microwave Background from multipole moments of about ≈ 50 to ≈ 500 (angular scales from ∼0.4◦ to ∼4◦), a range tha...
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ژورنال
عنوان ژورنال: Journal of Low Temperature Physics
سال: 2015
ISSN: 0022-2291,1573-7357
DOI: 10.1007/s10909-015-1370-2