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Published May 2, 2002 | Published
Book Section - Chapter Open

Polarization Observations with the Cosmic Background Imager


We describe polarization observations of the CMBR with the Cosmic Background Imager, a 13 element interferometer which operates in the 26-36 GHz band from Llano de Chajnantour in northern Chile. The array consists of 90-cm Cassegrain antennas mounted on a steerable platform which can be rotated about the optical axis to facilitate polarization observations. The CBI employs single mode circularly polarized receivers which sample multipoles from ℓ~400 to ℓ~4250. The instrumental polarization of the CBI was calibrated with 3C279, a bright polarized point source which was monitored with the VLA.

Additional Information

© 2002 American Institute of Physics. Issue Date: 8 May 2002. This work was made possible by NSF grant AST-9802989, and the generous support from the California Institute of Technology, Ronald and Maxine Linde, and Cecil and Sally Drinkward.

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