Figure 6: BICEP mount. The mount allows the receiver to continuously rotate about the optical axis and scan in both azimuth and elevation. (photo Kiwon Yoon)

BICEP will combine a 20 cm primary aperture, refractive optics, and a polarization-sensitive detector array cooled to 250 mK to achieve 1° and 0.7° beams at 100 GHz and 150 GHz, respectively, over a 20° diameter field-of-view. More information on the instrument is available in this paper.

Figure 7: BICEP environmental enclosure and ground shields. (photo Steffen Richter)