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The Cosmology Large Angular Scale Surveyor consists of four instrumentsperforming a CMB polarization survey. Currently, the 40 GHz and first 90 GHzinstruments are deployed and observing, with the second 90 GHz and amultichroic 150/220 GHz instrument to follow. The receiver is a centralcomponent of each instrument's design and functionality. This paper describesthe CLASS receiver design, using the first 90 GHz receiver as a primaryreference. Cryogenic cooling and filters maintain a cold, low-noise environmentfor the detectors. We have achieved receiver detector temperatures below 50 mKin the 40 GHz instrument for 85% of the initial 1.5 years of operation, andobserved in-band efficiency that is consistent with pre-deployment estimates.At 90 GHz, less than 26% of in-band power is lost to the filters and lenses inthe receiver, allowing for high optical efficiency. We discuss the mountingscheme for the filters and lenses, the alignment of the cold optics anddetectors, stray light control, and magnetic shielding.

The Cosmology Large Angular Scale Surveyor Receiver Design