The Arcminute Cosmology Bolometer Array (Acbar) was an array of 16 bolometric detectors cooled to 0.25K, operated at the South Pole on the Viper telescope. Building and operating this instrument was a collaborative effort of our group at Case with UC Berkeley (W. Holzapfel), Carnegie Mellon (J. Peterson), and Caltech (A. Lange). Acbar's first season at the Pole was the austral winter of 2000. Data were taken in the winter seasons of 2000, 2001, 2002, 2004, and 2005. The instrument has subsequently been dismantled and shipped back to the US, so the data-taking era is over; final CMB power spectrum results were submitted for publication in January 2008 (see Reichardt etal, below). Acbar currently has the best measurement of the CMB temperature anisotropy power spectrum at small angular scales, eg l>1000 or so. Publications from Acbar include:

The main Acbar website (with data posted) is maintained at Berkeley, at http://cosmology.berkeley.edu/group/swlh/acbar/.