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Open access Aug 2026

Optics and broadband antireflection coatings for the BA4-90/150 receiver

The BICEP Array telescopes search for primordial B-mode polarization from inflationary gravitational waves. This signal is exceedingly faint, demanding excellent map depth and systematics control. The new BA4-90/150 receiver introduces a wide 80–169 GHz dichroic band, requiring upgrades throughout the optics chain to r...

A. Polish, P. Ade, Z. Ahmed et al. · 0 citations
Open access Aug 2026

Quantifying the systematic impact of differential beam response on the BICEP CMB polarization data from 2016 through 2024

As cosmic microwave background (CMB) polarization experiments, including BICEP3, BICEP Array (BA), and future BICEP experiments, achieve ever-deeper polarization maps in search of primordial B-modes sourced from inflation, constraining instrumental systematics below statistical uncertainties becomes progressively more...

B. Elwood, P. Ade, Z. Ahmed et al. · 0 citations
Aug 2026

Status of BICEP array and integration of the 220/270GHz receiver

Measurements of the polarization of the cosmic microwave background are critical for modern cosmology as they constrain the physics of the early universe and cosmic inflation. BICEP Array is using a series of small-aperture polarimeters located at the South Pole to measure this signal with a projected σ(r) ≈ 0.001 by 2...

S. Steiger, P. Ade, Z. Ahmed et al. · 0 citations
Aug 2026

Aliased noise characterization and mitigation in BICEP Array 150, 220 and 270GHz time-division multiplexed detectors

Early observations with the BICEP Array 150 GHz (BA2-150) and 220/270 GHz (BA3-220/270) receivers revealed detector noise equivalent temperatures (NETs) higher than expected, together with substantial detector-to-detector and module-to-module scatter. Noise measurements acquired with multiplexing off and high frequency...

S. Fatigoni, P. Ade, Z. Ahmed et al. · 0 citations

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