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Published September 2010 | Published
Journal Article Open

Planck pre-launch status: HFI beam expectations from the optical optimisation of the focal plane


Planck is a European Space Agency (ESA) satellite, launched in May 2009, which will map the cosmic microwave background anisotropies in intensity and polarisation with unprecedented detail and sensitivity. It will also provide full-sky maps of astrophysical foregrounds. An accurate knowledge of the telescope beam patterns is an essential element for a correct analysis of the acquired astrophysical data. We present a detailed description of the optical design of the High Frequency Instrument (HFI) together with some of the optical performances measured during the calibration campaigns. We report on the evolution of the knowledge of the pre-launch HFI beam patterns when coupled to ideal telescope elements, and on their significance for the HFI data analysis procedure.

Additional Information

© 2010 ESO. Received 27 July 2009; Accepted 26 January 2010. Published online 15 September 2010. The authors would like to acknowledge the support from STFC, CNRS, CNES, NASA, Enterprise Ireland and Science Foundation Ireland. The authors extend their gratitude to numerous engineers and scientists who have contributed to the design, development, construction or evaluation of HFI.

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