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The SPT-3G+ receiver design
H. Athreya, Z. Ahmed, J. E. Austermann +71
We present the thermo-mechanical design of the cryostat and camera optics for SPT-3G+, a new receiver being developed for the South Pole Telescope (SPT). The receiver consists of 1…
The Simons Observatory: Science Goals and Forecasts for the Enhanced Large Aperture Telescope
The Simons Observatory Collaboration, M. Abitbol, I. Abril-Cabezas +419
We describe updated scientific goals for the wide-field, millimeter-wave survey that will be produced by the Simons Observatory (SO). Significant upgrades to the 6-meter SO Large A…
CCAT: Prime-Cam Optics Overview and Status Update
Zachary B. Huber, Lawrence T. Lin, Eve M. Vavagiakis +17
Prime-Cam is a first-generation science instrument for the CCAT Observatory's six-meter aperture Fred Young Submillimeter Telescope (FYST). FYST's crossed-Dragone design provides h…
Progress in the Design of the Atacama Large Aperture Submillimeter Telescope
Tony Mroczkowski, Claudia Cicone, Matthias Reichert +13
The Atacama Large Aperture Submillimeter Telescope (AtLAST) aims to be the premier next generation large diameter (50 meter) single dish observatory capable of observations across…
Fabrication of a Monolithic 5-Meter Aluminum Reflector for Millimeter-Wavelength Observations of the Cosmic Microwave Background
Tyler Natoli, Bradford Benson, John Carlstrom +9
We have demonstrated the fabrication of a monolithic, 5-meter diameter, aluminum reflector with 17.4 m RMS surface error. The reflector was designed to avoid the problem of pick…
Sidelobe Modeling and Mitigation for a Three Mirror Anastigmat Cosmic Microwave Background Telescope
Ian Gullett, Bradford Benson, Robert Besuner +16
Telescopes measuring cosmic microwave background (CMB) polarization on large angular scales require exquisite control of systematic errors to ensure the fidelity of the cosmologica…
CCAT-prime: Optical and cryogenic design of the 850 GHz module for Prime-Cam
Anthony I. Huber, Scott C. Chapman, Adrian K. Sinclair +14
Prime-Cam is a first-generation instrument for the Cerro Chajnantor Atacama Telescope-prime (CCAT-prime) Facility. The 850GHz module for Prime-Cam will probe the highest frequen…
CCAT-prime: The Optical Design for the Epoch of Reionization Spectrometer
Zachary B. Huber, Steve K. Choi, Cody J. Duell +11
The Epoch of Reionization Spectrometer (EoR-Spec) will be an instrument module for the Prime-Cam receiver on the CCAT-prime Collaboration's Fred Young Submillimeter Telescope (FYST…
Optical design concept of the CMB-S4 large-aperture telescopes and cameras
Patricio A. Gallardo, Bradford Benson, John Carlstrom +12
CMB-S4 -- the next-generation ground-based cosmic microwave background (CMB) experiment - will significantly advance the sensitivity of CMB measurements and improve our understandi…
The Simons Observatory: Characterizing the Large Aperture Telescope Receiver with Radio Holography
Grace E. Chesmore, Kathleen Harrington, Carlos E. Sierra +23
We present near-field radio holography measurements of the Simons Observatory Large Aperture Telescope Receiver optics. These measurements demonstrate that radio holography of comp…
The Simons Observatory: Design and Measured Performance of a Carbon Fiber Strut for a Cryogenic Truss
Kevin D. Crowley, Peter Dow, Jordan E. Shroyer +25
We present the design and measured performance of a new carbon fiber strut design that is used in a cryogenically cooled truss for the Simons Observatory Small Aperture Telescope (…
The Atacama Cosmology Telescope: Measurement and Analysis of 1D Beams for DR4
Marius Lungu, Emilie R. Storer, Matthew Hasselfield +28
We describe the measurement and treatment of the telescope beams for the Atacama Cosmology Telescope's fourth data release, DR4. Observations of Uranus are used to measure the cent…
The Atacama Cosmology Telescope: Modeling Bulk Atmospheric Motion
Thomas W. Morris, Ricardo Bustos, Erminia Calabrese +17
Fluctuating atmospheric emission is a dominant source of noise for ground-based millimeter-wave observations of the CMB temperature anisotropy at angular scales $\gtrsim 0.5^{\circ…
The Simons Observatory: HoloSim-ML: machine learning applied to the efficient analysis of radio holography measurements of complex optical systems
Grace E. Chesmore, Alexandre E. Adler, Nicholas F. Cothard +14
Near-field radio holography is a common method for measuring and aligning mirror surfaces for millimeter and sub-millimeter telescopes. In instruments with more than a single mirro…
The Simons Observatory: the Large Aperture Telescope (LAT)
Zhilei Xu, Shunsuke Adachi, Peter Ade +57
The Simons Observatory (SO) is a Cosmic Microwave Background (CMB) experiment to observe the microwave sky in six frequency bands from 30GHz to 290GHz. The Observatory -- at …
The Simons Observatory Large Aperture Telescope Receiver
Ningfeng Zhu, Tanay Bhandarkar, Gabriele Coppi +68
The Simons Observatory (SO) Large Aperture Telescope Receiver (LATR) will be coupled to the Large Aperture Telescope located at an elevation of 5,200 m on Cerro Toco in Chile. The…
CCAT-prime: Designs and status of the first light 280 GHz MKID array and Mod-Cam receiver
Cody J. Duell, Eve M. Vavagiakis, Jason Austermann +23
The CCAT-prime project's first light array will be deployed in Mod-Cam, a single-module testbed and first light cryostat, on the Fred Young Submillimeter Telescope (FYST) in Chile'…
Comparing complex impedance and bias step measurements of Simons Observatory transition edge sensors
Nicholas F. Cothard, Aamir M. Ali, Jason E. Austermann +16
The Simons Observatory (SO) will perform ground-based observations of the cosmic microwave background (CMB) with several small and large aperture telescopes, each outfitted with th…
The Simons Observatory: Metamaterial Microwave Absorber (MMA) and its Cryogenic Applications
Zhilei Xu, Grace E. Chesmore, Shunsuke Adachi +26
Controlling stray light at millimeter wavelengths requires special optical design and selection of absorptive materials that should be compatible with cryogenic operating environme…
The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope
Jon E. Gudmundsson, Patricio A. Gallardo, Roberto Puddu +35
We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for…
The Atacama Cosmology Telescope: DR5 maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data
Sigurd Naess, Simone Aiola, Jason E. Austermann +59
This paper presents a maximum-likelihood algorithm for combining sky maps with disparate sky coverage, angular resolution and spatially varying anisotropic noise into a single map…
Characterization of aliased noise in the Advanced ACTPol receiver
Patricio A. Gallardo, Michael D. Niemack, Jason E. Austermann +14
Advanced ACTPol is the second generation polarization-sensitive upgrade to the aperture Atacama Cosmology Telescope (ACT), which increased detector count and frequency…
The CCAT-Prime Submillimeter Observatory
Manuel Aravena, Jason Austermann, Kaustuv Basu +53
The Cerro Chajnantor Atacama Telescope-prime (CCAT-prime) is a new 6-m, off-axis, low-emissivity, large field-of-view submillimeter telescope scheduled for first light in the last…
Sensitivity of the Prime-Cam Instrument on the CCAT-prime Telescope
Steve K. Choi, Jason Austermann, Kaustuv Basu +19
CCAT-prime is a new 6 m crossed Dragone telescope designed to characterize the Cosmic Microwave Background (CMB) polarization and foregrounds, measure the Sunyaev-Zel'dovich effect…