Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-24
Rev.Sci.Instrum. 75 (2004) 5079-5083
Astronomy and Astrophysics
Astrophysics
5 pages including 5 figures. Submitted to Review of Scientific Instruments
Scientific paper
10.1063/1.1821622
We describe the design and calibration of an external cryogenic blackbody calibrator used for the first two flights of the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE) instrument. The calibrator consists of a microwave absorber weakly coupled to a superfluid liquid helium bath. Half-wave corrugations viewed 30 deg off axis reduce the return loss below -35 dB. Ruthenium oxide resistive thermometers embedded within the absorber monitor the temperature across the face of the calibrator. The thermal calibration transfers the calibration of a reference thermometer to the flight thermometers using the flight thermometer readout system. Data taken near the superfluid transition in 8 independent calibrations 4 years apart agree within 0.3 mK, providing an independent verification of the thermometer calibration at temperatures near that of the cosmic microwave background.
Fixsen Dale J.
Kogut Alan
Levin Sergey
Limon Michele
Lubin Phil M.
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