DASI
DASI instrument with a Sun Dog peeking over its top.
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The Viper telescope with DASI's ground shield partially open - 2000-2001 Season.
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DASI's ground shield - 2000-2001 Season.
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Working atop the DASI Feed horns in the cold of the South Pole.
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DASI gets a lift into the VIPER telescope mount.
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Re-assembling DASI.
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Group Photo of the 2000-2001 installation crew.
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DASI at the NSF Amundsen-Scott South Pole station, at sunset.
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OverviewDASI (Degree Angular Scale Interferometer) was a 13-element interferometer designed to measure the temperature and polarization anisotropy of the Cosmic Microwave Background (CMB) Radiation over a large range of scales with high sensitivity. The instrument used cooled HEMT amplifiers running between 26–36 GHz, in ten 1 GHz channels and operated from the NSF Amundsen-Scott South Pole station. DASI was initially configured for measurements of the CMB temperature anisotropy on angular scales corresponding to multipoles 140 < l < 900. These observations were completed during the 2000 Austral winter. After installation of a large reflective radiation shield surrounding the telescope, polarization observations were taken over three years (2001 - 2003). The polarization data consisted of deep observations of two 3.◦4 FWHM fields, at Right Ascension 23h30m and 00h30m, and Declination −55° (J2000). The fields were chosen for low levels of synchrotron emission and lack of point sources in temperature maps. EE and BB spectra were published as five bandpowers spanning the range 28 < l < 1050. Experiment Information:
The archived DASI website can be viewed HERE. |
