S. J. Benton

The XFaster Power Spectrum and Likelihood Estimator for the Analysis of Cosmic Microwave Background Maps

A. E. Gambrel, A. Rahlin, Xue Song, Carlo Contaldi et autres

Abstract We present the XFaster analysis package, a fast, iterative angular power spectrum estimator based on a diagonal approximation to the quadratic Fisher matrix estimator. It uses Monte Carlo simulations to compute noise biases and filter transfer functions and is thus a …

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BICEP2/Keck Array XI: Beam Characterization and Temperature-to-Polarization Leakage in the BK15 Data Set

P. A. R. Ade, Zeeshan Ahmed, R. W. Aikin, D. Barkats et autres

Abstract Precision measurements of cosmic microwave background (CMB) polarization require extreme control of instrumental systematics. In a companion paper we have presented cosmological constraints from observations with the BICEP2 and Keck Array experiments up to and including the 2015 observing season (BK15), …

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A Loyalty Test for the American Educator

S. J. Benton

During the early years of the American Republic, an important strain of American popular culture helped establish the idea that there was something fundamentally un-American about those who put too high a value on intellectual community, book smarts, and cultural sophistication. Popular …

Constraints on Primordial Gravitational Waves Using P l a n c k , WMAP, and New BICEP2/ K e c k Observations through the 2015 Season

P. A. R. Ade, Zeeshan Ahmed, R. W. Aikin, K. D. Alexander et autres

We present results from an analysis of all data taken by the bicep2/Keck CMB polarization experiments up to and including the 2015 observing season. This includes the first Keck Array observations at 220 GHz and additional observations at 95 and 150 GHz. …

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Ultra-Thin Large-Aperture Vacuum Windows for Millimeter Wavelengths Receivers

D. Barkats, M. Dierickx, J. M. Kovac, Chris Pentacoff et autres

Targeting faint polarization patterns arising from Primordial Gravitational Waves in the Cosmic Microwave Background requires excellent observational sensitivity. Optical elements in small aperture experiments such as Bicep3 and Keck Array are designed to optimize throughput and minimize losses from transmission, reflection and …

A new limit on CMB circular polarization from SPIDER

Johanna M. Nagy, P. A. R. Ade, M. Amiri, S. J. Benton et autres

We present a new upper limit on cosmic microwave background (CMB) circular polarization from the 2015 flight of Spider, a balloon-borne telescope designed to search for B-mode linear polarization from cosmic inflation. Although the level of circular polarization in the CMB is …

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BICEP3 performance overview and planned Keck Array upgrade

J. Grayson, P. A. R. Ade, Zeeshan Ahmed, K. D. Alexander et autres

Bicep3 is a 520mm 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 …

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Improved Constraints on Cosmology and Foregrounds from BICEP2 and Keck Array Cosmic Microwave Background Data with Inclusion of 95 GHz Band

P. A. R. Ade, Zeeshan Ahmed, R. W. Aikin, K. D. Alexander et autres

We present results from an analysis of all data taken by the BICEP2 and Keck Array cosmic microwave background (CMB) polarization experiments up to and including the 2014 observing season. This includes the first Keck Array observations at 95 GHz. The maps …

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BICEP2 and Keck array: upgrades and improved beam characterization

I. Buder, P. A. R. Ade, Zeeshan Ahmed, R. W. Aikin et autres

Searching for evidence of inflation by measuring B-modes in the cosmic microwave background (CMB) polarization at degree angular scales remains one of the most compelling experimental challenges in cosmology. BICEP2 and the Keck Array are part of a program of experiments at …

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Keck array and BICEP3: spectral characterization of 5000+ detectors

K. S. Karkare, P. A. R. Ade, Zeeshan Ahmed, R. W. Aikin et autres

The inflationary paradigm of the early universe predicts a stochastic background of gravitational waves which would generate a B-mode polarization pattern in the cosmic microwave background (CMB) at degree angular scales. Precise measurement of B-modes is one of the most compelling observational …

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Pointing control for the SPIDER balloon-borne telescope

J. A. Shariff, P. A. R. Ade, M. Amiri, S. J. Benton et autres

We present the technology and control methods developed for the pointing system of the Spider experiment. Spider is a balloon-borne polarimeter designed to detect the imprint of primordial gravitational waves in the polarization of the Cosmic Microwave Background radiation. We describe the …

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Helping sufferers to cope with noise using distance learning cognitive behaviour therapy

Geoff Leventhall, Donald Robertson, S. J. Benton, Lyn Leventhall