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

B. Maffei, F. Noviello, J. A. Murphy, P. A.R. Ade, J. M. Lamarre, F. R. Bouchet, J. Brossard, A. Catalano, R. Colgan, R. Gispert, E. Gleeson, C. V. Haynes, W. C. Jones, A. E. Lange, Y. Longval, I. McAuley, F. Pajot, T. Peacocke, G. Pisano, J. L. PugetI. Ristorcelli, G. Savini, R. Sudiwala, R. J. Wylde, V. Yurchenko

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41 Scopus citations


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.

Original languageEnglish (US)
Article numberA12
JournalAstronomy and Astrophysics
Issue number1
StatePublished - Sep 15 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • cosmic microwave background
  • instrumentation: detectors
  • instrumentation: polarimeters
  • space vehicles: instruments
  • submillimeter: general
  • telescopes


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