DASI: Degree Angular Scale Interferometer for imaging anisotropy in the cosmic microwave background

Details DASI: Degree Angular Scale Interferometer for imaging anisotropy in the cosmic microwave background DASI: Degree Angular Scale Interferometer for imaging anisotropy in the cosmic microwave background

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3357..416h&link_type=abstract

Proc. SPIE Vol. 3357, p. 416-423, Advanced Technology MMW, Radio, and Terahertz Telescopes, Thomas G. Phillips; Ed.

Computer Science

8

Scientific paper

The Degree Angular Scale Interferometer (DASI) is a compact cm-wave interferometer designed to image anisotropy in the Cosmic Microwave Background (CMB) and to measure its angular power spectrum. The power spectrum will be densely sampled over the l range 160 to 710, corresponding to angular scales of 0.25 to 1.15 degrees. DASI consists of 13 elements. Each element consists of a 20-cm diameter lensed corrugated horn followed by a cooled low-noise HEMT amplifier operating from 26 - 36 GHz. All elements are mounted on a single alt-az mount, which fixes the projected baselines and obviates an IF tracking delay. The mount also includes rotation of the aperture plane along the line of sight to improve the u, v coverage and the control of instrumental systematics. The 10 GHz IF bandwidth will be correlated in 1 GHz bands to provide spectral index information. The instrument is scheduled to be completed in Summer 1998. After extensive testing it will be deployed at the South Pole for year-round operation starting in November 1999.

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