2017/11/30 by Steve K. Choi, Jason Austermann, Jason E. Austermann +24 · 1 citation
Engineering · Physics and Astronomy · #Antenna Design and Optimization #Characterization (materials science) #Materials science #Microwave Engineering and Waveguides #Nanotechnology #Radio Frequency Integrated Circuit Design #astro-ph.IM
paper · pdf · doi:10.1007/s10909-018-1982-4
Version accepted for publication by Journal of Low Temperature Physics
openalex publication_date 2018/06/04 · arxiv created 2018/06/25 · arxiv updated 2018/06/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polarization, using four new dichroic detector arrays fabricated on 150-mm silicon wafers. These bolometric cameras use AlMn transition-edge sensors, coupled to feedhorns with orthomode transducers for polarization sensitivity. The first deployed camera is sensitive to both 150 GHz and 230 GHz. Here we present the lab characterization of the thermal parameters and optical efficiencies for the two newest fielded arrays, each sensitive to both 90 GHz and 150 GHz. We provide assessments of the parameter uniformity across each array with evaluation of systematic uncertainties. Lastly, we show the arrays' initial performance in the field.