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

Essinger‐Hileman, T.; Kusaka, A.; Appel, John W.; Choi, Steve K.; Crowley, Kevin T.; Ho, Shuay-Pwu Patty; Jarosik, N.; Page, Lyman A.; Parker, Lucas; Raghunathan, S.; Simon, Sara M.; Staggs, Suzanne T.; Visnjic, Katerina

doi:10.1063/1.4962023

Cited by 54 publications

(59 citation statements)

References 39 publications

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“…imprecise knowledge of the instrument (see e.g., [108][109][110][111][112] for a sample list of references). The tightest constraints on m ν from a single experiment come from the measurements of the Planck satellite [14].…”

Section: Cmbmentioning

confidence: 99%

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

2018

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Cosmological observations are a powerful probe of neutrino properties, and in particular of their mass. In this review, we first discuss the role of neutrinos in shaping the cosmological evolution at both the background and perturbation level, and describe their effects on cosmological observables such as the cosmic microwave background and the distribution of matter at large scale. We then present the state of the art concerning the constraints on neutrino masses from those observables, and also review the prospects for future experiments. We also briefly discuss the prospects for determining the neutrino hierarchy from cosmology, the complementarity with laboratory experiments, and the constraints on neutrino properties beyond their mass.

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Section: Cmbmentioning

confidence: 99%

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

2018

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“…As described in §5.3, the 2f component serves as a calibration tool for monitoring the detector responsivities. Leakage of I into the 4f component of A(χ) has been constrained to be less than 0.07% for the "dipole" and "quadrupole" terms [70], corresponding to a systematic error contribution of r < 0.01, even without attempting to measure and remove the leakage signal [25].…”

Section: Hwp Modulationmentioning

confidence: 99%

“…One of the unique features of ABS is its use of a rapidly rotating ambient-temperature half-wave plate (HWP) to modulate the incident polarized signal at frequencies above where atmospheric fluctuations dominate over detector noise [42], and above where thermal drifts contaminate the signal. The HWP also suppresses systematic effects [25]. We present here limits on r from two years of ABS data, with emphasis on the analysis techniques for, and benefits from, the HWP.…”

Section: Introductionmentioning

confidence: 99%

Results from the Atacama B-mode Search (ABS) experiment

Kusaka

Appel

Essinger-Hileman

et al. 2018

J. Cosmol. Astropart. Phys.

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The Atacama B-mode Search (ABS) is an experiment designed to measure cosmic microwave background (CMB) polarization at large angular scales ( > 40). It operated from the ACT site at 5190 m elevation in northern Chile at 145 GHz with a net sensitivity (NEQ) of 41 µK √ s. It employed an ambient-temperature sapphire half-wave plate rotating at 2.55 Hz to modulate the incident polarization signal and reduce systematic effects. We report here on the analysis of data from a 2400 deg 2 patch of sky centered at declination −42 • and right ascension 25 • . We perform a blind analysis. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky. We marginally detect polarized dust emission and give an upper limit on the tensor-to-scalar ratio of r < 2.3 (95% cl) with the equivalent of 100 on-sky days of observation. We also present a new measurement of the polarization of Tau A and introduce new methods associated with HWP-based observations.The ABS instrument, shown in Fig. 1a, is a 145 GHz polarization-sensitive bolometric receiver and cryogenic telescope. Its key characteristics are presented in Table 1. It is integrated into a standard shipping container for rapid deployment. A hoist system elevates the az-el mounted cryostat onto the roof of the container from where it scans the sky. A co-moving ground screen that shields the receiver from terrestrial radiation is attached after the mount is hoisted into position. The ground screen supplements a conical baffle at the window to the cryostat.1 The array NET is calculated from the median NET of each detector that passes the data selection; the number quoted here refers to observations of Field A.2 The PWV is estimated with data from the Atacama Pathfinder EXperiment (APEX) Weather Monitor: http://www.apex-telescope.org/weather/Historical_weather/index.htm.3 All reported temperatures for the CMB and detector-related quantities are relative to the CMB.

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“…See e.g. (Savini et al 2006;Bryan et al 2010;Essinger-Hileman et al 2016). In terms of the data model in Eq.…”

Section: Half-wave Plate Modulationmentioning

confidence: 99%

Full-sky beam convolution for cosmic microwave background applications

Duivenvoorden

Gudmundsson

Rahlin

2019

Monthly Notices of the Royal Astronomical Society

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We introduce a publicly available full-sky beam convolution code library intended to inform the design of future cosmic microwave background (CMB) instruments and help current experiments probe potential systematic effects. The code can be used to assess the impact of optical systematics on all stages of data reduction for a realistic experiment, including analyses beyond power spectrum estimation, by generating signal timelines that may serve as input to full analysis pipelines. The design and mathematical framework of the Python code is discussed along with a few simple benchmarking results. We present a simple two-lens refracting telescope design and use it together with the code to simulate a year-long dataset for 400 detectors scanning the sky on a satellite instrument. The simulation results identify a number of sub-leading optical non-idealities and demonstrate significant B-mode residuals caused by extended sidelobes that are sensitive to polarized radiation from the Galaxy. For the proposed design and satellite scanning strategy, we show that a full physical optics beam model generates B-mode systematics that differ significantly from the simpler elliptical Gaussian model. The code is available at https://github.com/adrijd/beamconv.

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

Cited by 54 publications

References 39 publications

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

Results from the Atacama B-mode Search (ABS) experiment

Full-sky beam convolution for cosmic microwave background applications

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