A photograph of the QUaD telescope inside its groundshield taken from a crane above the telescope.
|Alternative names||QUEST at DASI|
|Observatory||Amundsen–Scott South Pole Station|
|Location(s)||Antarctic Treaty area|
|Telescope style||Cosmic microwave background experiment|
QUaD, an acronym for QUEST at DASI, was a ground-based cosmic microwave background (CMB) polarization experiment at the South Pole. QUEST (Q and U Extragalactic Sub-mm Telescope) was the original name attributed to the bolometer detector instrument, while DASI is a famous CMB interferometry experiment credited with the first detection of CMB polarization. QUaD used the existing DASI mechanical infrastructure but replaced the DASI interferometric array with a bolometer detector at the end of a cassegrain optical system. The mount has housed the Keck Array since 2011.
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