6 research outputs found
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BICEP3 focal plane design and detector performance
BICEP3, the latest telescope in the BICEP/Keck program, started science observations in March 2016. It is a 550mm aperture refractive telescope observing the polarization of the cosmic microwave background at 95 GHz. We show the focal plane design and detector performance, including spectral response, optical efficiency and preliminary sensitivity of the upgraded BICEP3. We demonstrate 9.72 µK√s noise performance of the BICEP3 receiver.Astronom
Optical characterization of the BICEP3 CMB polarimeter at the South Pole
BICEP3 is a small-aperture refracting cosmic microwave background (CMB)
telescope designed to make sensitive polarization maps in pursuit of a
potential B-mode signal from inflationary gravitational waves. It is the latest
in the BICEP/Keck Array series of CMB experiments at the South Pole, which has
provided the most stringent constraints on inflation to date. For the 2016
observing season, BICEP3 was outfitted with a full suite of 2400 optically
coupled detectors operating at 95 GHz. In these proceedings we report on the
far field beam performance using calibration data taken during the 2015-2016
summer deployment season in situ with a thermal chopped source. We generate
high-fidelity per-detector beam maps, show the array-averaged beam profile, and
characterize the differential beam response between co-located, orthogonally
polarized detectors which contributes to the leading instrumental systematic in
pair differencing experiments. We find that the levels of differential
pointing, beamwidth, and ellipticity are similar to or lower than those
measured for BICEP2 and Keck Array. The magnitude and distribution of BICEP3's
differential beam mismatch - and the level to which temperature-to-polarization
leakage may be marginalized over or subtracted in analysis - will inform the
design of next-generation CMB experiments with many thousands of detectors.Comment: 17 pages, 9 figures. Presented at SPIE Astronomical Telescopes and
Instrumentation Conference 9914: Millimeter, Submillimeter, and Far-Infrared
Detectors and Instrumentation for Astronomy VIII, June 201
Womens incomes over the lifetime
SIGLEAvailable from British Library Document Supply Centre-DSC:m00/16926 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
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BICEP3 performance overview and planned Keck Array upgrade
Bicep3 is a 520 mm aperture, compact two-lens refractor designed to observe the polarization of the cosmic microwave background (CMB) at 95 GHz. Its focal plane consists of modularized tiles of antenna-coupled transition edge sensors (TESs), similar to those used in Bicep2 and the Keck Array. The increased per-receiver optical throughput compared to Bicep2/Keck Array, due to both its faster f /1.7 optics and the larger aperture, more than doubles the combined mapping speed of the Bicep/Keck program. The Bicep3 receiver was recently upgraded to a full complement of 20 tiles of detectors (2560 TESs) and is now beginning its second year of observation (and first science season) at the South Pole. We report on its current performance and observing plans. Given its high per-receiver throughput while maintaining the advantages of a compact design, Bicep3class receivers are ideally suited as building blocks for a 3rd-generation CMB experiment, consisting of multiple receivers spanning 35 GHz to 270 GHz with total detector count in the tens of thousands. We present plans for such an array, the new “Bicep Array” that will replace the Keck Array at the South Pole, including design optimization, frequency coverage, and deployment/observing strategies.Astronom
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Optical characterization of the BICEP3 CMB polarimeter at the South Pole
Bicep3 is a small-aperture refracting cosmic microwave background (CMB) telescope designed to make sensitive polarization maps in pursuit of a potential B-mode signal from inflationary gravitational waves. It is the latest in the Bicep/Keck Array series of CMB experiments located at the South Pole, which has provided the most stringent constraints on inflation to date. For the 2016 observing season, Bicep3 was outfitted with a full suite of 2400 optically coupled detectors operating at 95 GHz. In these proceedings we report on the far field beam performance using calibration data taken during the 2015-2016 summer deployment season in situ with a thermal chopped source. We generate high-fidelity per-detector beam maps, show the array-averaged beam profile, and characterize the differential beam response between co-located, orthogonally polarized detectors which contributes to the leading instrumental systematic in pair differencing experiments. We find that the levels of differential pointing, beamwidth, and ellipticity are similar to or lower than those measured for Bicep2 and Keck Array. The magnitude and distribution of Bicep3’s differential beam mismatch – and the level to which temperature-to-polarization leakage may be marginalized over or subtracted in analysis – will inform the design of next-generation CMB experiments with many thousands of detectors.Astronom