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J. B. Peterson (CMU), P. A. R Ade (U Cardiff), J. J. Bock (JPL), C. M. Cantalupo (UCBerkeley-SSL), K. Coble (U Chicago), M. D. Daub (UC Berkeley), J. Goldstein (UC Santa Barbara), W. L. Holzapfel, C. L. Kuo (UC Berkeley), A. E. Lange (CIT), M. Lueker, M. Newcomb (UC Berkeley), J. Ruhl (UC Santa Barbara), M. C. Runyan (CIT), E. Torbet (UC Santa Barbara)
The ACBAR photometer on the Viper telescope at the South Pole has been used to map the Cosmic Microwave Background with 5 arcminute resolution. Several fields of size 2 x 3 degrees have been mapped at 150 GHz with a per-beam noise level about 25 microkelvin. The same fields have also been mapped at 220, 280 and 350 GHz, but with higher noise levels. When fully analyzed this data set will be used to determine the anisotropy power spectrum from l~100 to l~2000. This will allow a sensitive test of the acoustic oscillation model in the damping regime, and will tightly constrain cosmological parameters such as the baryon density and ionization fraction. The same data set will be used to create a catalog of previously unknown high-redshift galaxy clusters detected through the Sunyaez-Zeldovic effect. Measurement of the density of these clusters provides a sensitive determination of the matter density. Support was provided by NSF grant OPP-8920223.