Planck early results: first assessment of the High Frequency Instrument in-flight performance
Abstract
The Planck High Frequency Instrument (HFI) is designed to measure the temperature and polarization anisotropies of the Cosmic Microwave Background and galactic foregrounds in six wide bands centered at 100, 143, 217, 353, 545 and 857 GHz at an angular resolution of 10' (100 GHz), 7' (143 GHz), and 5' (217 GHz and higher). HFI has been operating flawlessly since launch on 14 May 2009. The bolometers cooled to 100 mK as planned. The settings of the readout electronics, such as the bolometer bias current, that optimize HFI's noise performance on orbit are nearly the same as the ones chosen during ground testing. Observations of Mars, Jupiter, and Saturn verified both the optical system and the time response of the detection chains. The optical beams are close to predictions from physical optics modeling. The time response of the detection chains is close to pre-launch measurements. The detectors suffer from an unexpected high flux of cosmic rays related to low solar activity. Due to the redundancy of Planck's observations strategy, the removal of a few percent of data contaminated by glitches does not affect significantly the sensitivity. The cosmic rays heat up significantly the bolometer plate and the modulation on periods of days to months of the heat load creates a common drift of all bolometer signals which do not affect the scientific capabilities. Only the high energy cosmic rays showers induce inhomogeneous heating which is a probable source of low frequency noise.
Keywords
Cite
@article{arxiv.1101.2039,
title = {Planck early results: first assessment of the High Frequency Instrument in-flight performance},
author = {Planck HFI Core Team and P. A. R. Ade and N. Aghanim and R. Ansari and M. Arnaud and M. Ashdown and J. Aumont and A. J. Banday and M. Bartelmann and J. G. Bartlett and E. Battaner and K. Benabed and A. Benot and J. -P. Bernard and M. Bersanelli and R. Bhatia and J. J. Bock and J. R. Bond and J. Borrill and F. R. Bouchet and F. Boulanger and T. Bradshaw and E. Brelle and M. Bucher and P. Camus and J. -F. Cardoso and A. Catalano and A. Challinor and A. Chamballu and J. Charra and M. Charra and R. -R. Chary and C. Chiang and S. Church and D. L. Clements and S. Colombi and F. Couchot and A. Coulais and C. Cressiot and B. P. Crill and M. Crook and P. de Bernardis and J. Delabrouille and J. -M. Delouis and F. -X. Désert and K. Dolag and H. Dole and O. Doré and M. Douspis and G. Efstathiou and P. Eng and C. Filliard and O. Forni and P. Fosalba and J. -J. Fourmond and K. Ganga and M. Giard and D. Girard and Y. Giraud-Héraud and R. Gispert and K. M. Gorski and S. Gratton and M. Griffin and G. Guyot and J. Haissinski and D. Harrison and G. Helou and S. Henrot-Versillé and C. Hernandez-Monteagudo and S. R. Hildebrandt and R. Hills and E. Hivon and M. Hobson and W. A. Holmes and K. M. Huenberger and A. H. Jae and W. C. Jones and J. Kaplan and R. Kneissl and L. Knox and G. Lagache and J. -M. Lamarre and P. Lami and A. E. Lange and A. Lasenby and A. Lavabre and C. R. Lawrence and B. Leriche and C. Leroy and Y. Longval and J. F. Macas-Perez and T. Maciaszek and C. J. MacTavish and B. Maei and N. Mandolesi and R. Mann and B. Mansoux and S. Masi and T. Matsumura and P. McGehee and J. -B. Melin and C. Mercier and M. -A. Miville-Deschnes and A. Moneti and L. Montier and D. Mortlock and A. Murphy and F. Nati and C. B. Nettereld and H. U. Norgaard-Nielsen and C. North and F. Noviello and D. Novikov and S. Osborne and C. Paine and F. Pajot and G. Patanchon and T. Peacocke and T. J. Pearson and O. Perdereau and L. Perotto and F. Piacentini and M. Piat and S. Plaszczynski and E. Pointecouteau and R. Pons and N. Ponthieu and G. Prezeau and S. Prunet and J. -L. Puget and W. T. Reach and C. Renault and I. Ristorcelli and G. Rocha and C. Rosset and G. Roudier and M. Rowan-Robinson and B. Rusholme and D. Santos and G. Savini and B. M. Schaefer and P. Shellard and L. Spencer and J. -L. Starck and P. Stassi and V. Stolyarov and R. Stompor and R. Sudiwala and R. Sunyaev and J. -F. Sygnet and J. A. Tauber and C. Thum and J. -P. Torre and F. Touze and M. Tristram and F. Van Leeuwen and L. Vibert and D. Vibert and L. A. Wade and B. D. Wandelt and S. D. M. White and H. Wiesemeyer and A. Woodcraft and V. Yurchenko and D. Yvon and A. Zacchei},
journal= {arXiv preprint arXiv:1101.2039},
year = {2015}
}
Comments
Submitted to A&A. 22 pages, 6 tables, 21 figures. One of a set of simultaneous papers for the Planck Mission