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Systematic effects from an ambient-temperature, continuously-rotating half-wave plate | | T. Essinger-Hileman
; A. Kusaka
; J. W. Appel
; S. K. Choi
; K. Crowley
; N. Jarosik
; L. A. Page
; L. P. Parker
; S. Raghunathan
; S. M. Simon
; S. T. Staggs
; K. Visnjic
; | | Date: |
22 Jan 2016 | | Abstract: | 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. The HWP allows for rejection of unpolarized atmospheric
fluctuations and ground pickup, as well as clear separation of celestial
polarization from intensity. In a previous paper, we demonstrated 30 dB
rejection of atmospheric fluctuations on timescales of 500 s. 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. We report a scalar leakage of ~0.01%,
consistent with model expectations and an order of magnitude smaller than other
CMB experiments have reported. No significant dipole or quadruple terms are
detected; we constrain each to be < 0.06% (95% confidence). Before any
mitigation due to crosslinking or boresight rotation, the upper limit on
possible systematic error from these effects corresponds to a tensor-to-scalar
ratio r<0.01. This demonstrates that ABS achieves significant beam systematic
error mitigation from of its HWP and shows the promise of continuously-rotating
HWPs for future experiments. | | Source: | arXiv, 1601.5901 | | Services: | Forum | Review | PDF | Favorites | |
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