Brossard, J. and Yurchenko, V. and Gleeson, E. and Longval, Y. and Maffei, B. and Murphy, J.Anthony and Ristorcelli, I. and Lamarre, J.-M. (2004) PLANCK-HFI : Performances of an optical concept for the cosmic microwave background anisotropies measurement. In: Proceedings of the 5th International Conference on Space Optics (ICSO 2004). ESA-SP (554). ESA Publications, pp. 333-340.

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Abstract

PLANCK is a project of the European Space Agency to be launched in February 2007 by an Ariane V rocket with the Herschel Space Observatory. It is designed for imaging the temperature and polarization anisotropies of the millimetre and sub-millimetre radiation over the whole sky with unprecedented sensitivity, accuracy and angular resolution using 9 frequency channels ranging between 25 and 1000 GHz. The main source at these frequencies is the Cosmic Microwave Background (CMB), i.e. the radiation emitted by the early universe when, about 300000 years old, ionised hydrogen recombined and became transparent from the visible to radio frequencies of the electromagnetic spectrum. The main goal of the PLANCK mission is to retrieve the main cosmological parameters of the Universe with accuracies of a few percent from the observation and analysis of random small contrast (10-4) features in the CMB. The angular power spectrum of the CMB anisotropies is a function of the fundamental cosmological parameters. A proper measurement of all the angular frequencies of the CMB is essential for an accurate interpretation of the data. In consequence the optical performances of Planck will directly impact the ability of retrieving theses parameters. Recent results of the Willkinson Microwave Anisotropy Probe (WMAP) mission show that polarization information of CMB radiation is very challenging, and that the precise measurement of the CMB could completely change the knowledge we have on our universe. The focal plane assembly (FPA) of the PLANCK telescope is composed of two instruments. The High Frequency Instrument (HFI) of PLANCK is the most sensitive CMB experiment ever planned. Together with the Low Frequency Instrument (LFI), this will make a unique tool to measure the full sky and to separate various components of its spectrum. This paper describes the main performances of the HFI beams and compares results obtained with 2 different softwares: GRASP8 and an home-made software developed at the Ireland National University of Maynooth. Specials attention will be paid to polarized beams (100, 143, 217, 353 GHz) and multimoded channels (545 and 857 GHz).

Item Type:	Book Section
Additional Information:	Cite as: Proceedings of the 5th International Conference on Space Optics (ICSO 2004), 30 March - 2 April 2004, Toulouse, France. Ed.: B. Warmbein. ESA SP-554, Noordwijk, Netherlands: ESA Publications Division, ISBN 92-9092-865-4, 2004, p. 333 - 340
Keywords:	PLANCK-HFI; optical concept; cosmic microwave background; anisotropies measurement; CMB; temperature; polarization anisotropies; millimetre and sub-millimetre radiation;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	14009
Depositing User:	Dr. Anthony Murphy
Date Deposited:	12 Feb 2021 16:42
Publisher:	ESA Publications
Refereed:	Yes
URI:
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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