4 papers
The Atacama Cosmology Telescope: Constraints on Cosmic Birefringence
Toshiya Namikawa, Yilun Guan, Omar Darwish +51
We present new constraints on anisotropic birefringence of the cosmic microwave background polarization using two seasons of data from the Atacama Cosmology Telescope covering $456…
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…
Demonstration of 220/280 GHz Multichroic Feedhorn-Coupled TES Polarimeter
Samantha Walker, Carlos E. Sierra, Jason E. Austermann +11
We describe the design and measurement of feedhorn-coupled, transition-edge sensor (TES) polarimeters with two passbands centered at 220 GHz and 280 GHz, intended for observations…
The Simons Observatory: Astro2020 Decadal Project Whitepaper
The Simons Observatory Collaboration, Maximilian H. Abitbol, Shunsuke Adachi +280
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert in Chile that promises to provide breakthrough…