BICEP Array: a multi-frequency degree-scale CMB polarimeter
2018
BicepArray is the newest multi-frequency instrument in the
Bicep/Keck
Array program. It is comprised of four 550mm aperture
refractive telescopesobserving the polarization of the
cosmic microwave background(CMB) at 30/40, 95, 150 and 220/270 GHz with over 30,000 detectors. We present an overview of the receiver, detailing the optics, thermal, mechanical, and magnetic shielding design.
BicepArray follows Bicep3's modular focal plane concept, and upgrades to 6" wafer to reduce fabrication with higher detector count per module. The first receiver at 30/40GHz is expected to start observing at the South Pole during the 2019-20 season. By the end of the planned
Bicep
Array program, we project 0.002 ⪅ σ(r) ⪅ 0.006, assuming current modeling of polarized Galactic foreground and depending on the level of delensing that can be achieved with higher resolution maps from the
South Pole Telescope.
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