Studies of systematic uncertainties for Simons Observatory: Polarization modulator related effects

Maria Salatino, Jacob Lashner, Martina Gerbino, Sara M. Simon, Joy Didier, Aamir Ali, Peter C. Ashton, Sean Bryan, Yuji Chinone, Kevin Coughlin, Kevin T. Crowley, Giulio Fabbian, Nicholas Galitzki, Neil Goeckner-Wald, Jon E. Gudmundsson, Charles A. Hill, Brian Keating, Akito Kusaka, Adrian T. Lee, Jeffrey McMahonAmber D. Miller, Giuseppe Puglisi, Christian L. Reichardt, Grant Teply, Zhilei Xu, Ningfeng Zhu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations

Abstract

The Simons Observatory (SO) will observe the temperature and polarization anisotropies of the cosmic microwave background (CMB) over a wide range of frequencies (27 to 270 GHz) and angular scales by using both small (â1/40.5 m) and large (â1/46 m) aperture telescopes. The SO small aperture telescopes will target degree angular scales where the primordial B-mode polarization signal is expected to peak. The incoming polarization signal of the small aperture telescopes will be modulated by a cryogenic, continuously-rotating half-wave plate (CRHWP) to mitigate systematic effects arising from slowly varying noise and detector pair-differencing. In this paper, we present an assessment of some systematic effects arising from using a CRHWP in the SO small aperture systems. We focus on systematic effects associated with structural properties of the HWP and effects arising when operating a HWP, including the amplitude of the HWP synchronous signal (HWPSS), and I → P (intensity to polarization) leakage that arises from detector non-linearity in the presence of a large HWPSS. We demonstrate our ability to simulate the impact of the aforementioned systematic effects in the time domain. This important step will inform mitigation strategies and design decisions to ensure that SO will meet its science goals.

Original languageEnglish (US)
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
EditorsJonas Zmuidzinas, Jian-Rong Gao
PublisherSPIE
ISBN (Print)9781510619692
DOIs
StatePublished - 2018
Externally publishedYes
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 - Austin, United States
Duration: Jun 12 2018Jun 15 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10708
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018
Country/TerritoryUnited States
CityAustin
Period6/12/186/15/18

Keywords

  • Continuously Rotating Half-Wave Plate
  • Cosmic Microwave Background
  • Intensity to Polarization Leakage
  • Non Linearity
  • Sapphire
  • Simons Observatory
  • Slant Incidence
  • Systematic effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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