The Cosmic Background Imager 2
arXiv:1108.3950 · doi:10.1111/j.1365-2966.2011.19661.x
Abstract
We describe an upgrade to the Cosmic Background Imager instrument to increase its surface brightness sensitivity at small angular scales. The upgrade consisted of replacing the thirteen 0.9-m antennas with 1.4-m antennas incorporating a novel combination of design features, which provided excellent sidelobe and spillover performance for low manufacturing cost. Off-the-shelf spun primaries were used, and the secondary mirrors were oversized and shaped relative to a standard Cassegrain in order to provide an optimum compromise between aperture efficiency and low spillover lobes. Low-order distortions in the primary mirrors were compensated for by custom machining of the secondary mirrors. The secondaries were supported on a transparent dielectric foam cone to minimize scattering. The antennas were tested in the complete instrument, and the beam shape and spillover noise contributions were as expected. We demonstrate the performance of the telescope and the inter-calibration with the previous system using observations of the Sunyaev-Zel'dovich effect in the cluster Abell 1689. The enhanced instrument has been used to study the cosmic microwave background, the Sunyaev-Zel'dovich effect and diffuse Galactic emission.
10 pages,9 colour figures and 1 table; accepted for publication in MNRAS
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Cited by in corpus (4)
- A multi-wavelength investigation of RCW175: an HII region harboring spinning dust emission
- A Circularly Symmetric Antenna Design With High Polarization Purity and Low Spillover
- Resolved observations at 31 GHz of spinning dust emissivity variations in Oph
- Observations of Galactic star-forming regions with the Cosmic Background Imager at 31 GHz