QUaD

QUaD,^[1] 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.

QUaD

A photograph of the QUaD telescope inside its groundshield taken from a crane above the telescope.
Alternative names	QUEST at DASI
Location(s)	Antarctic Treaty area
Coordinates	89°59′29″S 44°30′00″W
Location of QUaD
Related media on Commons

See also

• Cosmic microwave background radiation
• Cosmic microwave background experiments