 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″S44°30′00″W / 89.9914°S 44.5°W |
  Location of QUaD | |
 Related media on Commons | |
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.
