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Performance of a continuously rotating half-wave plate on the POLARBEAR telescope

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [3]; ; ;  [4];  [5]; ; ; ; ;  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];
  1. Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 Japan (Japan)
  2. Departamento de Física, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago (Chile)
  3. SOKENDAI (The Graduate University for Advanced Studies), Hayama, Miura District, Kanagawa, 240-0115 Japan (Japan)
  4. Department of Physics, University of California, San Diego, CA, 92093-0424 (United States)
  5. International School for Advanced Studies (SISSA), Via Bonomea 265, Trieste, I-34136 Italy (Italy)
  6. Department of Physics, University of California, Berkeley, CA, 94720 (United States)
  7. Centro de Astro-Ingeniería, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago (Chile)
  8. Computational Cosmology Center, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 (United States)
  9. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, B3H 4R2 Canada (Canada)
  10. Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba, 277-8583 Japan (Japan)
  11. Sorbonne Universités, Institut Lagrange de Paris (ILP), 98 bis Boulevard Arago, Paris, 75014 France (France)
  12. Institut d'Astrophysique Spatiale, CNRS (UMR 8617), Université Paris-Sud, Université Paris-Saclay, bât. 121, Orsay, 91405 France (France)
  13. Yokohama National University, Yokohama, Kanagawa, 240-8501 Japan (Japan)
A continuously rotating half-wave plate (CRHWP) is a promising tool to improve the sensitivity to large angular scales in cosmic microwave background (CMB) polarization measurements. With a CRHWP, single detectors can measure three of the Stokes parameters, I , Q and U , thereby avoiding the set of systematic errors that can be introduced by mismatches in the properties of orthogonal detector pairs. We focus on the implementation of CRHWPs in large aperture telescopes (i.e. the primary mirror is larger than the current maximum half-wave plate diameter of ∼0.5 m), where the CRHWP can be placed between the primary mirror and focal plane. In this configuration, one needs to address the intensity to polarization ( I → P ) leakage of the optics, which becomes a source of 1/f noise and also causes differential gain systematics that arise from CMB temperature fluctuations. In this paper, we present the performance of a CRHWP installed in the (\scshape Polarbear) experiment, which employs a Gregorian telescope with a 2.5 m primary illumination pattern. The CRHWP is placed near the prime focus between the primary and secondary mirrors. We find that the I → P leakage is larger than the expectation from the physical properties of our primary mirror, resulting in a 1/f knee of 100 mHz. The excess leakage could be due to imperfections in the detector system, i.e. detector non-linearity in the responsivity and time-constant. We demonstrate, however, that by subtracting the leakage correlated with the intensity signal, the 1/f noise knee frequency is reduced to 32 mHz (ℓ ∼ 39 for our scan strategy), which is very promising to probe the primordial B-mode signal. We also discuss methods for further noise subtraction in future projects where the precise temperature control of instrumental components and the leakage reduction will play a key role.
OSTI ID:
22676231
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 05 Vol. 2017; ISSN 1475-7516
Country of Publication:
United States
Language:
English

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Cited By (12)

Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate journal May 2019
The Simons Observatory: Science goals and forecasts text January 2019
Measurements of tropospheric ice clouds with a ground-based CMB polarization experiment, POLARBEAR text January 2018
The Simons Observatory: Science goals and forecasts text January 2018
Measurements of Tropospheric Ice Clouds with a Ground-based CMB Polarization Experiment, POLARBEAR journal January 2019
A Measurement of the Cosmic Microwave Background B -mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data journal October 2017
Intensity-Coupled-Polarization in Instruments with a Continuously Rotating Half-Wave Plate text January 2017
Systematic effects induced by half-wave plate precession into measurements of the cosmic microwave background polarization journal July 2019
A large-diameter hollow-shaft cryogenic motor based on a superconducting magnetic bearing for millimeter-wave polarimetry journal October 2017
A Large-Diameter Hollow-Shaft Cryogenic Motor Based on a Superconducting Magnetic Bearing for Millimeter-Wave Polarimetry text January 2017
The Simons Observatory: science goals and forecasts journal February 2019
The EBEX Balloon-borne Experiment—Detectors and Readout journal November 2018

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