A bolometric millimeter-wave system for observations of anisotropy in the cosmic microwave background radiation on medium angular scales

Physics – Optics

Scientific paper

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Anisotropy, Background Radiation, Balloon-Borne Instruments, Bolometers, Microwaves, Millimeter Waves, Receivers, Telescopes, Astronomical Models, Brightness, Modulation, Photometers, Relic Radiation

Scientific paper

We report the performance of a bolometric system designed to measure the anisotropy of the cosmic microwave background (CMB) radiation on angular scales from 0 deg 3 min to 3 deg. The system represents a collaborative effort combining a low-background 1 m diameter balloon-borne telescope with new multimode feed optics, a beam modulation mechanism with high stability, and a four-channel bolometric receiver with passbands centered near frequencies of 3 (90), 6 (180), 9 (270), and 12 (360) cm-1 (GHz). The telescope was flown three times with the bolometric receiver and has demonstrated detector noise limited performance capable of reaching sensitivity levels of Delta(T)/TCMB is approximately equal to 10-5 with detectors operated at T = 0.3 K.

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