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Contributions à la définition des besoins scientifiques et des solutions instrumentales du projet Planck-HFI

Abstract : The Planck satellite, which will be launch in 2007, is the third generation of instruments dedicated to the measurement of the anisotropy of the Cosmic Microwave Background, with a sensitivity about 600 times better than COBE. This important progress will be achieved thanks to the technology evolution in the field of bolometric detectors, cryogenics and low noise readout electronics. Such a sensitive measurement needs to control different aspect, which are intimately coupled: acquisition of low level signals, production and monitoring of low temperatures, control of radiation straylight and stability of the measurement. This thesis deals with the relations between these aspects but also reports my contribution to the technological progresses in these fields. The two first chapters describe on one hand the astrophysical context and on the other hand the Planck mission and the High Frequency Instrument (HFI). The third chapter depicts the installation of the Symbol test bench that allowed me to test and to validate technological solutions for HFI. The straylight problem is treated in the chapter 5 and leads to the temperature stability specification of the Planck-HFI different stages. This leads me to study the technological solutions that allow getting the 100mK bolometer stage temperature stability specification, subject treated in the 6th chapter. The 7th chapter deals with HFI thermometry in terms of precision and sensitivity. Finally, the last chapter shows how these progresses make possible the detection by Planck-HFI of the dipole effect in the Cosmic Infrared Background due to the emission of distant redshifted galaxies that are not resolved.
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https://tel.archives-ouvertes.fr/tel-00004038
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Submitted on : Friday, December 19, 2003 - 5:18:56 PM
Last modification on : Tuesday, February 9, 2021 - 4:24:02 PM
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Michel Piat. Contributions à la définition des besoins scientifiques et des solutions instrumentales du projet Planck-HFI. Astrophysique [astro-ph]. Université Paris Sud - Paris XI, 2000. Français. ⟨tel-00004038⟩

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