Design and Deployment of a Multichroic Polarimeter Array on the Atacama Cosmology Telescope

Abstract

We present the design and the preliminary on sky performance with respect to beams and pass-bands of a multichroic polarimeter array covering the 90 and 146 GHz Cosmic Microwave Background (CMB) bands and its enabling broadband optical system recently deployed on the Atacama Cosmology Telescope (ACT). The constituent pixels are feedhorn-coupled multichroic polarimeters fabricated at NIST. This array is coupled to the ACT telescope via a set of three silicon lenses incorporating novel broad-band metamaterial anti-reflection coatings. This receiver represents the first multichroic detector array deployed for a CMB experiment and paves the way for the extensive use of multichroic detectors and broadband optical systems in the next generation of CMB experiments.

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Cited by in corpus (10)

• The Atacama Cosmology Telescope: The polarization-sensitive ACTPol instrument
• The Atacama Cosmology Telescope: DR5 maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data
• Prime-Cam: A first-light instrument for the CCAT-prime telescope
• Design of 280 GHz feedhorn-coupled TES arrays for the balloon-borne polarimeter SPIDER
• The POLARBEAR Fourier Transform Spectrometer Calibrator and Spectroscopic Characterization of the POLARBEAR Instrument
• Development of Multi-Chroic MKIDs for Next-Generation CMB Polarization Studies
• Constraints on the Optical Depth to Reionization from Balloon-Borne CMB Measurements
• Composite Reflective/Absorptive IR-Blocking Filters Embedded in Metamaterial Antireflection Coated Silicon
• Analytical expression of aperture efficiency affected by Seidel aberrations
• The Simons Observatory: Design and Measured Performance of a Carbon Fiber Strut for a Cryogenic Truss