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Two Year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-End Variable-delay Polarization Modulator at 40 GHz
Kathleen Harrington, Rahul Datta, Keisuke Osumi +33
The Cosmology Large Angular Scale Surveyor (CLASS) is a four-telescope array observing the largest angular scales () of the cosmic microwave backgroun…
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: the Large Aperture Telescope Receiver (LATR) Integration and Validation Results
Zhilei Xu, Tanay Bhandarkar, Gabriele Coppi +42
The Simons Observatory (SO) will observe the cosmic microwave background (CMB) from Cerro Toco in the Atacama Desert of Chile. The observatory consists of three 0.5 m Small Apertur…
The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers
Eve M. Vavagiakis, Zeeshan Ahmed, Aamir Ali +30
The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe…
The Simons Observatory: gain, bandpass and polarization-angle calibration requirements for B-mode searches
Maximilian H. Abitbol, David Alonso, Sara M. Simon +45
We quantify the calibration requirements for systematic uncertainties for next-generation ground-based observatories targeting the large-angle -mode polarization of the Cosmic M…
Venus Observations at 40 and 90 GHz with CLASS
Sumit Dahal, Michael K. Brewer, John W. Appel +30
Using the Cosmology Large Angular Scale Surveyor, we measure the disk-averaged absolute Venus brightness temperature to be 432.3 2.8 K and 355.6 1.3 K in the Q and W fr…
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…
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
S4 Collaboration, Kevork Abazajian, Graeme E. Addison +233
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 underst…
Simons Observatory Microwave SQUID Multiplexing Readout -- Cryogenic RF Amplifier and Coaxial Chain Design
Mayuri Sathyanarayana Rao, Maximiliano Silva-Feaver, Aamir Ali +33
The Simons Observatory (SO) is an upcoming polarization-sensitive Cosmic Microwave Background (CMB) experiment on the Cerro Toco Plateau (Chile) with large overlap with other optic…
Small Aperture Telescopes for the Simons Observatory
Aamir M. Ali, Shunsuke Adachi, Kam Arnold +49
The Simons Observatory (SO) is an upcoming cosmic microwave background (CMB) experiment located on Cerro Toco, Chile, that will map the microwave sky in temperature and polarizatio…
Characterization of Transition Edge Sensors for the Simons Observatory
Jason R. Stevens, Nicholas F. Cothard, Eve M. Vavagiakis +31
The Simons Observatory is building both large (6 m) and small (0.5 m) aperture telescopes in the Atacama desert in Chile to observe the cosmic microwave background (CMB) radiation…