Measuring Polarization with DASI

Abstract

We describe an experiment to measure the polarization of the Cosmic Microwave Background (CMB) with the Degree Angular Scale Interferometer (DASI), a compact microwave interferometer optimized to detect CMB anisotropy at multipoles 140 to 900. The telescope has operated at the Amundsen-Scott South Pole research station since 2000 January. The telescope was retrofit as a polarimeter during the 2000--2001 austral summer, and throughout the 2001 and 2002 austral winters has made observations of the CMB with sensitivity to all four Stokes parameters. The telescope performance has been extensively characterized through observations of artificial sources, the Moon, and polarized and unpolarized Galactic sources. In 271 days of observation, DASI has differenced the CMB fluctuations in two fields to an rms noise level of 2.8 uK.

12 pages, 9 figures, submitted to the Astrophysical Journal

References in corpus (5)

• DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
• Detection of Polarization in the Cosmic Microwave Background using DASI
• Cosmological Parameter Extraction from the First Season of Observations with DASI
• The Cosmic Background Imager
• Experiment Design and First Season Observations with the Degree Angular Scale Interferometer

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