  The Atacama Cosmology Telescope is a 6-meter telescope designed to map the
Cosmic Microwave Background simultaneously at 145 GHz, 215 GHz, and 280 GHz
with arcminute resolution. Each frequency will have a 32 by 32 element focal
plane array of TES bolometers. This paper describes the design of the telescope
and the cold reimaging optics, which is optimized for millimeter-wave
observations with these sensitive detectors.
