  CMB-HD is a proposed ultra-deep (0.5 uk-arcmin), high-resolution (15
arcseconds) millimeter-wave survey over half the sky that would answer many
outstanding questions in both fundamental physics of the Universe and
astrophysics. This survey would be delivered in 7.5 years of observing 20,000
square degrees, using two new 30-meter-class off-axis cross-Dragone telescopes
to be located at Cerro Toco in the Atacama Desert. Each telescope would field
800,000 detectors (200,000 pixels), for a total of 1.6 million detectors.
