Impact of modulation on CMB B-mode polarization experiments

Abstract

We investigate the impact of both slow and fast polarization modulation strategies on the science return of upcoming ground-based experiments aimed at measuring the B-mode polarization of the CMB. Using simulations of the Clover experiment, we compare the ability of modulated and un-modulated observations to recover the signature of gravitational waves in the polarized CMB sky in the presence of a number of anticipated systematic effects. The general expectations that fast modulation is helpful in mitigating low-frequency detector noise, and that the additional redundancy in the projection of the instrument's polarization sensitivity directions onto the sky when modulating reduces the impact of instrumental polarization, are borne out by our simulations. Neither low-frequency polarized atmospheric fluctuations nor systematic errors in the polarization sensitivity directions are mitigated by modulation. Additionally, we find no significant reduction in the effect of pointing errors by modulation. For a Clover-like experiment, pointing jitter should be negligible but any systematic mis-calibration of the polarization coordinate reference system results in significant E-B mixing on all angular scales and will require careful control. We also stress the importance of combining data from multiple detectors in order to remove the effects of common-mode systematics (such as 1/f atmospheric noise) on the measured polarization signal. Finally we compare the performance of our simulated experiment with the predicted performance from a Fisher analysis. We find good agreement between the Fisher predictions and the simulations except for the very largest scales where the power spectrum estimator we have used introduces additional variance to the B-mode signal recovered from our simulations.

Replaced with version accepted by MNRAS. Analysis of half-wave plate systematic (differential transmittance) added

References in corpus (16)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectra
• Second and third season QUaD CMB temperature and polarization power spectra
• CMB Polarization Systematics Due to Beam Asymmetry: Impact on Inflationary Science
• Systematic errors in cosmic microwave background polarization measurements
• A general solution to the E-B mixing problem
• New Measurements of Fine-Scale CMB Polarization Power Spectra from CAPMAP at Both 40 and 90 GHz
• The Robinson Gravitational Wave Background Telescope (BICEP): a bolometric large angular scale CMB polarimeter
• QUaD: A High-Resolution Cosmic Microwave Background Polarimeter
• B-Pol: Detecting Primordial Gravitational Waves Generated During Inflation
• SPIDER: A Balloon-borne Large-scale CMB Polarimeter
• Spider Optimization: Probing the Systematics of a Large Scale B-Mode Experiment
• Search for Gravitational Waves in the CMB After WMAP3: Foreground Confusion and The Optimal Frequency Coverage for Foreground Minimization
• Map-making in small field modulated CMB polarisation experiments: approximating the maximum-likelihood method

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