The Cosmology Large Angular Scale Surveyor

Abstract

The Cosmology Large Angular Scale Surveyor (CLASS) is a four telescope array designed to characterize relic primordial gravitational waves from inflation and the optical depth to reionization through a measurement of the polarized cosmic microwave background (CMB) on the largest angular scales. The frequencies of the four CLASS telescopes, one at 38 GHz, two at 93 GHz, and one dichroic system at 145/217 GHz, are chosen to avoid spectral regions of high atmospheric emission and span the minimum of the polarized Galactic foregrounds: synchrotron emission at lower frequencies and dust emission at higher frequencies. Low-noise transition edge sensor detectors and a rapid front-end polarization modulator provide a unique combination of high sensitivity, stability, and control of systematics. The CLASS site, at 5200 m in the Chilean Atacama desert, allows for daily mapping of up to 70\% of the sky and enables the characterization of CMB polarization at the largest angular scales. Using this combination of a broad frequency range, large sky coverage, control over systematics, and high sensitivity, CLASS will observe the reionization and recombination peaks of the CMB E- and B-mode power spectra. CLASS will make a cosmic variance limited measurement of the optical depth to reionization and will measure or place upper limits on the tensor-to-scalar ratio, $r$, down to a level of 0.01 (95\% C.L.).

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• A Review of Long-baseline Neutrino Oscillation Experiments
• Background reionization history from omniscopes
• The Cosmology Large Angular Scale Surveyor (CLASS): 38 GHz detector array of bolometric polarimeters
• The Primordial Inflation Polarization Explorer (PIPER)
• A cryogenic rotation stage with a large clear aperture for the half-wave plates in the Spider instrument
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Cited by in corpus (50)

• CMB-S4 Science Case, Reference Design, and Project Plan
• CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
• The string swampland constraints require multi-field inflation
• Exploring Cosmic Origins with CORE: Inflation
• Prospects for Measuring Cosmic Microwave Background Spectral Distortions in the Presence of Foregrounds
• The Cosmology Large Angular Scale Surveyor
• The C-Band All-Sky Survey (C-BASS): Design and capabilities
• The large scale polarization explorer (LSPE) for CMB measurements: performance forecast
• The Simons Observatory Large Aperture Telescope Receiver
• A 3D-printed broadband millimeter wave absorber
• Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands
• Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1
• A Projected Estimate of the Reionization Optical Depth Using the CLASS Experiment's Sample-Variance Limited E-Mode Measurement
• A Tip for Landscape Riders: Multi-Field Inflation Can Fulfill the Swampland Distance Conjecture
• The Cosmology Large Angular Scale Surveyor (CLASS): 38 GHz detector array of bolometric polarimeters
• The Experiment for Cryogenic Large-aperture Intensity Mapping (EXCLAIM)
• Readout of two-kilopixel transition-edge sensor arrays for Advanced ACTPol
• QUBIC: Exploring the primordial Universe with the Q\&U Bolometric Interferometer
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz
• On-sky performance of the CLASS Q-band telescope
• LiteBIRD Science Goals and Forecasts. A Case Study of the Origin of Primordial Gravitational Waves using Large-Scale CMB Polarization
• General Modified Gravity With 21cm Intensity Mapping: Simulations and Forecast
• Two Year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-End Variable-delay Polarization Modulator at 40 GHz
• Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys
• The Cosmology Large Angular Scale Surveyor Receiver Design
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q Band
• Neutrino Interactions in the Late Universe
• Calibration of Transition-edge Sensor (TES) Bolometer Arrays with Application to CLASS
• Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane
• Efficient ILC analysis on polarization maps after EB leakage correction
• Testing CMB Anomalies in E-mode Polarization with Current and Future Data
• Reconstructing CMB fluctuations and the mean reionization optical depth
• Optical Design of the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM)
• The LSPE-Strip feed horn array
• The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers
• Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Crosstalk effects in microwave SQUID multiplexed TES bolometer readout
• Venus Observations at 40 and 90 GHz with CLASS
• Scale invariance of the primordial tensor power spectrum
• Pixel space convolution for cosmic microwave background experiments
• Control and systems software for the Cosmology Large Angular Scale Surveyor (CLASS)
• The Large Number Limit of Multifield Inflation
• On-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)
• Cosmological Implications of a Neutrino Mass Detection
• Microwave Observations of Venus with CLASS
• Post-inflationary production of particle Dark Matter: Hilltop and Coleman-Weinberg inflation
• Variable-delay Polarization Modulators for the CLASS Telescopes
• 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