Jeffrey McMahon

Simons Observatory: Predeployment Performance of a Large Aperture Telescope Optics Tube in the 90 and 150 GHz Spectral Bands

Carlos Sierra, Kathleen Harrington, Shreya Sutariya, Thomas Alford et autres

Abstract The Simons Observatory will map the temperature and polarization over half of the sky at millimeter wavelengths in six spectral bands from the Atacama Desert in Chile. These data will provide new insights into the genesis, content, and history of our …

The Vertical Integrated Spectrometer (VIS) focal plane: orders of magnitude improvement in mm-wave Line Intensity Mapping (LIM) with an inline waveguide-to-on-chip transition

Austin R. Stover, P Sharpe, Juliang Li, Audrey P. Scott et autres

Scalable, densely packed spectrometer arrays (integral field units, or IFUs) would enable intensity mapping sensitive enough for precision measurements of cosmology and astrophysics in a new redshift regime. This scalability requires a new architecture, with spectrometers oriented parallel with incident light. The …

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Superfluid-tight cryogenic receiver with continuous sub-Kelvin cooling for EXCLAIM

Sumit Dahal, P. A. R. Ade, Christopher Anderson, Alyssa Barlis et autres

The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a balloon-borne telescope designed to survey star formation over cosmological time scales using intensity mapping in the 420 – 540 GHz frequency range. EXCLAIM uses a fully cryogenic telescope coupled to six on-chip …

Simons Observatory: Pre-deployment Performance of a Large Aperture Telescope Optics Tube in the 90 and 150 GHz Spectral Bands

Carlos Sierra, Kathleen Harrington, Shreya Sutariya, Thomas Alford et autres

The Simons Observatory will map the temperature and polarization over half of the sky, at millimeter wavelengths in six spectral bands from the Atacama Desert in Chile. These data will provide new insights into the genesis, content, and history of our Universe; …

BoloCalc: a sensitivity calculator for the design of Simons Observatory (Erratum)

Charles A. Hill, Sarah Marie Bruno, Sara M. Simon, Aamir Ali et autres

Publisher's Note: This paper, originally published on, 9 July 2018, was replaced with a corrected/revised version on,12 September 2023. If you downloaded the original PDF but are unable to access the revision, please contact SPIE Digital Library Customer Service for assistance.

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Tolerance Analysis of Octave Bandwidth Millimeter-Wave Planar Orthomode Transducer

Johannes Hubmayr, Jason E. Austermann, James A. Beall, Jake Connors et autres

Planar Orthomode Transducers (OMTs) are commonly used for polarization measurements at millimeter wavelengths. We present an optical coupling study of an octave bandwidth planar OMT in circular waveguide based on 3D electromagnetic simulations. We quantify results through metrics such as co- and …

EXCLAIM: the EXperiment for Cryogenic Large-Aperture Intensity Mapping

Thomas Essinger-Hileman, P. A. R. Ade, Christopher J. Anderson, Alyssa Barlis et autres

The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) will constrain star formation over cosmic time by carrying out a blind and complete census of redshifted carbon monoxide (CO) and ionized carbon ([CII]) emission in cross-correlation with galaxy survey data in redshift windows …

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Advanced ACTPol: Calibrating Fourier-Transform Spectrometer Bandpass Measurements

Thomas Alford, Rahul Datta, Shreya Sutariya, Grace E. Chesmore et autres

This conference presentation was prepared for the Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI conference at SPIE Astronomical Telescopes + Instrumentation, 2022.

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Snowmass 2021 CMB-S4 White Paper

Kevork N. Abazajian, Arwa Abdulghafour, Graeme E. Addison, Peter Adshead et autres

This Snowmass 2021 White Paper describes the Cosmic Microwave Background Stage 4 project CMB-S4, which is designed to cross critical thresholds in our understanding of the origin and evolution of the Universe, from the highest energies at the dawn of time through …

CMB-S4: Forecasting Constraints on Primordial Gravitational Waves

Kevork N. Abazajian, Graeme E. Addison, Peter Adshead, Zeeshan Ahmed et autres

Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe. Among the science cases pursued with CMB-S4, the quest for detecting primordial …

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The Simons Observatory Microwave SQUID Multiplexing Detector Module Design

Heather McCarrick, Erin Healy, Zeeshan Ahmed, Kam Arnold et autres

Advances in cosmic microwave background (CMB) science depend on increasing the number of sensitive detectors observing the sky. New instruments deploy large arrays of superconducting transition-edge sensor (TES) bolometers tiled densely into ever larger focal planes. High multiplexing factors reduce the thermal …

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The optical design and performance of TolTEC: a millimeter-wave imaging polarimeter

Emily Lunde, P. A. R. Ade, Marc Berthoud, Reid Contente et autres

TolTEC is an imaging polarimeter that will be mounted on the 50m diameter Large Millimeter Telescope (LMT) in Mexico. This camera simultaneously images the focal plane at three wavebands centered at 1.1, 1.4, and 2.0mm. TolTEC combines polarization-sensitive Kinetic Inductance Detectors (KIDs) …

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