CLASS: The Cosmology Large Angular Scale Surveyor

Abstract

The Cosmology Large Angular Scale Surveyor (CLASS) is an experiment to measure the signature of a gravita-tional-wave background from inflation in the polarization of the cosmic microwave background (CMB). CLASS is a multi-frequency array of four telescopes operating from a high-altitude site in the Atacama Desert in Chile. CLASS will survey 70\% of the sky in four frequency bands centered at 38, 93, 148, and 217 GHz, which are chosen to straddle the Galactic-foreground minimum while avoiding strong atmospheric emission lines. This broad frequency coverage ensures that CLASS can distinguish Galactic emission from the CMB. The sky fraction of the CLASS survey will allow the full shape of the primordial B-mode power spectrum to be characterized, including the signal from reionization at low $\ell$. Its unique combination of large sky coverage, control of systematic errors, and high sensitivity will allow CLASS to measure or place upper limits on the tensor-to-scalar ratio at a level of $r=0.01$ and make a cosmic-variance-limited measurement of the optical depth to the surface of last scattering, $\tau$.

23 pages, 10 figures, Presented at SPIE Astronomical Telescopes and Instrumentation 2014: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII. To be published in Proceedings of SPIE Volume 9153

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• The Impact of Atmospheric Fluctuations on Degree-scale Imaging of the Cosmic Microwave Background
• Simple foreground cleaning algorithm for detecting primordial B-mode polarization of the cosmic microwave background
• The Cosmology Large Angular Scale Surveyor (CLASS): 40 GHz optical design
• Properties of a Variable-delay Polarization Modulator
• Impact of Galactic polarized emission on B-mode detection at low multipoles
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• Studies of Millimeter-Wave Atmospheric Noise Above Mauna Kea
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Cited by in corpus (105)

• The Simons Observatory: Science goals and forecasts
• Early Dark Energy Can Resolve The Hubble Tension
• The Quest for B Modes from Inflationary Gravitational Waves
• Advanced ACTPol Cryogenic Detector Arrays and Readout
• Neutrino Mass Ordering from Oscillations and Beyond: 2018 Status and Future Prospects
• Robust forecasts on fundamental physics from the foreground-obscured, gravitationally-lensed CMB polarization
• Forward Modeling of Large-Scale Structure: An open-source approach with Halotools
• Neutral hydrogen structures trace dust polarization angle: Implications for cosmic microwave background foregrounds
• Axion Gauge Field Inflation and Gravitational Leptogenesis: A Lower Bound on B Modes from the Matter-Antimatter Asymmetry of the Universe
• The Cosmology Large Angular Scale Surveyor
• Probing primordial features with future galaxy surveys
• Exploring cosmic origins with CORE: gravitational lensing of the CMB
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• Polarized galactic synchrotron and dust emission and their correlation
• Health checkup test of the standard cosmological model in view of recent Cosmic Microwave Background Anisotropies experiments
• Stable solutions of inflation driven by vector fields
• Propagating Speed of Primordial Gravitational Waves
• Dust polarization and ISM turbulence
• Probing Dark Matter with Future CMB Measurements
• Exploring Early Dark Energy solution to the Hubble tension with Planck and SPTPol data
• Inflation, the Hubble Tension and Early Dark Energy: an alternative overview
• Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies
• Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands
• Cosmological implications of $n_s\approx 1$ in light of the Hubble tension
• Survey strategy optimization for the Atacama Cosmology Telescope
• The Simons Observatory: gain, bandpass and polarization-angle calibration requirements for B-mode searches
• Mitigating the optical depth degeneracy using the kinematic Sunyaev-Zel'dovich effect with CMB-S4
• Towards a reliable calculation of relic radiation from primordial gravitational waves
• The CLASS 150/220 GHz Polarimeter Array: Design, Assembly, and Characterization
• Fat Inflatons, Large Turns and the $\eta$-problem
• Neutrino Mass from Cosmology: Probing Physics Beyond the Standard Model
• A Projected Estimate of the Reionization Optical Depth Using the CLASS Experiment's Sample-Variance Limited E-Mode Measurement
• Inflationary Potential as seen from Different Angles: Model Compatibility from Multiple CMB Missions
• Readout of two-kilopixel transition-edge sensor arrays for Advanced ACTPol
• Ultra High Molecular Weight Polyethylene: optical features at millimeter wavelengths
• Likelihood methods for CMB experiments
• A cryogenic rotation stage with a large clear aperture for the half-wave plates in the Spider instrument
• Circular polarization of the CMB: Foregrounds and detection prospects
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Higher-Curvature Corrections and Tensor Modes
• On-sky performance of the CLASS Q-band telescope
• Novel higher-curvature variations of $R^2$ inflation
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz
• Transition Edge Sensors: Physics and Applications
• CMB B-mode non-Gaussianity: optimal bispectrum estimator and Fisher forecasts
• Circular polarization of the cosmic microwave background from vector and tensor perturbations
• Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators
• Probing the inflationary background of gravitational waves from large to small scales
• Feedhorn development and scalability for Simons Observatory and beyond
• On chromonatural inflation in string theory
• Two Year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-End Variable-delay Polarization Modulator at 40 GHz
• Measuring the Largest Angular Scale CMB B-mode Polarization with Galactic Foregrounds on a Cut Sky
• Thermal Kinetic Inductance Detectors for millimeter-wave detection
• The Cosmology Large Angular Scale Surveyor Receiver Design
• Deep Reactive Ion Etched Anti-Reflection Coatings for Sub-millimeter Silicon Optics
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q Band
• Studies of Systematic Uncertainties for Simons Observatory: Detector Array Effects
• Cosmological Angular Trispectra and Non-Gaussian Covariance
• Silicon-Based Antenna-Coupled Polarization-Sensitive Millimeter-Wave Bolometer Arrays for Cosmic Microwave Background Instruments
• Calibration of Transition-edge Sensor (TES) Bolometer Arrays with Application to CLASS
• The Effects of Bandpass Variations on Foreground Removal Forecasts for Future CMB Experiments
• Cosmological Probes of Structure Growth and Tests of Gravity
• Suitability of Magnetic Microbolometers based on Paramagnetic Temperature Sensors for CMB Polarization Measurements
• Pushing the Limits of Broadband and High Frequency Metamaterial Silicon Antireflection Coatings
• Real-space computation of $E$/$B$-mode maps I: Formalism, Compact Kernels, and Polarized Filaments
• Testing CMB Anomalies in E-mode Polarization with Current and Future Data
• Beyond optical depth: Future determination of ionization history from the CMB
• Generation of Circular Polarization of CMB via Polarized Compton Scattering
• Cosmology Large Angular Scale Surveyor (CLASS) Focal Plane Development
• The Impact of Primordial Magnetic Fields on Future CMB Bounds on Inflationary Gravitational Waves
• Hierarchical sinuous-antenna phased array for millimeter wavelengths
• External priors for the next generation of CMB experiments
• Impact of Galactic dust non-Gaussianity on searches for B-modes from inflation
• New Interpretations of the Cosmological Preference for a Negative Neutrino Mass
• Gravitational waves, CMB polarization, and the Hubble tension
• Cosmology at high redshift -- a probe of fundamental physics
• Measurement and Modeling of Polarized Atmosphere at the South Pole with SPT-3G
• Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Isotropy-Violation Diagnostics for $B$-mode Polarization Foregrounds to the Cosmic Microwave Background
• Thermal emission from the amorphous dust: An alternative possibility of the origin of the anomalous microwave emission
• Current and Future constraints on single-field $\alpha$-Attractor model
• Venus Observations at 40 and 90 GHz with CLASS
• Astro2020 Decadal Science White Paper: The state of gravitational-wave astrophysics in 2020
• B-modes and the sound speed of primordial fluctuations
• Measuring Reionization, Neutrino Mass, and Cosmic Inflation with BFORE
• MeV Dark Matter with MeV Dark Photons in Abelian Kinetic Mixing Theories
• Control and systems software for the Cosmology Large Angular Scale Surveyor (CLASS)
• Pixel space convolution for cosmic microwave background experiments
• On-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)
• The Simons Observatory: Validation of reconstructed power spectra from simulated filtered maps for the Small Aperture Telescope survey
• The cross correlation of the ABS and ACT maps
• The Upper Bound on the Tensor-to-Scalar Ratio Consistent with Quantum Gravity
• Cosmic Strings-induced CMB anisotropies in light of Weighted Morphology
• Microwave Observations of Venus with CLASS
• Robust Likelihoods for Inflationary Gravitational Waves from Maps of Cosmic Microwave Background Polarization
• Broadband anti-reflection coating for sub-terahertz optics using dielectric multilayers
• Cosmic Microwave Background Science at Commercial Airline Altitudes
• BFORE: A CMB Balloon Payload to Measure Reionization, Neutrino Mass, and Cosmic Inflation
• Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light
• High-Efficiency and Low-Noise Detectors for the Upgraded CLASS 90 GHz Focal Plane
• Enabling Discoveries: Thirty Years of Advanced Technologies and Instrumentation at the National Science Foundation
• Running the small-correlated-against-large estimator at scale: Applications of small-scale CMB lensing estimators on realistic simulations
• Low-dimensional platforms for single photon detection
• Detectability of Galactic Faraday Rotation in Multi-wavelength CMB Observations: A Cross-Correlation Analysis of CMB and Radio Maps
• Quantum measurement systems and applications to particle physics and cosmology