CARA Science: DASI

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The Degree Angular Scale Interferometer (DASI) is an ambitious 13-element interferometric array designed to obtain highly sensitive and detailed images of CMB anisotropy and to determine its angular power spectrum (Halverson 1998). The unique imaging capabilities of DASI and its angular coverage (140 < l < 910) complement the Viper telescope, especially its future mm and submm capabilities to be provided by ACBAR, as well as the MAP satellite and other CMB experiments. DASI was successfully tested at Chicago this summer (see Figure 6) and passed a 'readiness review' conducted by three external scientists. It is now being shipped to the South Pole. The synergy of the DASI project with the Cosmic Background Imager (CBI) built at Caltech for imaging much higher angular scale CMB anisotropy at much higher angular scale (700 < l < 3600) allowed the DASI team to keep to its ambitious schedule. All components are built and tested including the telescope control, data acquisition, and data reduction software.

The first science observations with DASI are expected by the end of the 1999-2000 austral summer. DASI will operate throughout the winter.


Since the telescope is still under construction, there are no scientific results available. However, there is a paper on line (gzipped postscript) summarizing DASI's plans and progress as of mid-1998.


For more information

The group has a website at .

DASI is based at the University of Chicago. For more information, contact John Carlstrom,, or Mark Dragovan,