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.Comment: Version accepted for publication by Journal of Low Temperature
Physic
