The Receiver

Figure 1.
Cross-section of MAXIMA optical system. The primary mirror is a 1.3m off-axis paraboloid. The two reimaging mirrors are housed in a well baffled box that is maintained at LHe temperature. The optical system provides a 1 deg by 1 deg diffraction-limited field-of-view at 150 GHz. A baffle at the intermediate focus and a Lyot stop provide excellent sidelobe performance. The bolomters are cooled to 100mK by an Adiabatic Demagnetization Refrigerator. Both LN and LHe cryogen hold-times are about 40 hours. The optical entrance to the receiver is vacuum sealed with a window made from 40 micron thick polypropylene.
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