Thermal stability in precision cosmology experiments: the Planck LFI case

Details Thermal stability in precision cosmology experiments: the Planck LFI case Thermal stability in precision cosmology experiments: the Planck LFI case

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nimpa.520..393t&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 520, Issue 1-3, p. 393-395.

Physics

Cosmology, Cosmic Microwave Background Observation, Instrumentation, Detectors

Scientific paper

After the great success of NASA's satellite missions COBE and WMAP, the Planck mission represents the third generation of mm-wave instruments designed for space observations of CMB anisotropies. Two instruments, the Low-Frequency Instrument (LFI) and the High-Frequency Instrument (HFI) will produce CMB maps with unprecedented angular resolution, sensitivity and frequency coverage. This ambitious task will be achieved by using low noise HEMT detectors cryogenically cooled at ~20K for the LFI and bolometric detectors cooled at 0.1K for the HFI; in particular, the LFI is based on pseudo-correlation receivers in which the sky signal is continuously compared to a cryogenic reference load in thermal contact with the HFI 4K stage. Such high sensitivity in Planck detectors calls for a strict control of systematic effects, which must be kept at μK level in the final maps; this in turn imposes tight requirements on the thermal and electrical stability of the different stages in the instrument. In this paper we discuss a study of the impact of thermal fluctuations at the level of the 20K cooler cold-end on the Planck-LFI measurements and present some viable solutions that have been adopted to keep the residual systematic error within the required values for Planck-LFI.

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