Systematic effects from an ambient-temperature, continuously-rotating half-wave plate

Understand

We present an evaluation of systematic effects associated with a continuously-rotating, ambient-temperature half-wave plate (HWP) based on two seasons of data from the Atacama B-Mode Search (ABS) experiment located in the Atacama Desert of Chile.

• The ABS experiment is a microwave telescope sensitive at 145 GHz.
• Here we present our in-field evaluation of celestial (CMB plus galactic foreground) temperature-to-polarization leakage.
• We decompose the leakage into scalar, dipole, and quadrupole leakage terms.