Planck Early Results. II. The thermal performance of Planck
Abstract
The performance of the Planck instruments in space is enabled by their low operating temperatures, 20K for LFI and 0.1K for HFI, achieved through a combination of passive radiative cooling and three active mechanical coolers. The scientific requirement for very broad frequency coverage led to two detector technologies with widely different temperature and cooling needs. Active coolers could satisfy these needs; a helium cryostat, as used by previous cryogenic space missions (IRAS, COBE, ISO, Spitzer, AKARI), could not. Radiative cooling is provided by three V-groove radiators and a large telescope baffle. The active coolers are a hydrogen sorption cooler (<20K), a 4He Joule-Thomson cooler (4.7K), and a 3He-4He dilution cooler (1.4K and 0.1K). The flight system was at ambient temperature at launch and cooled in space to operating conditions. The HFI bolometer plate reached 93mK on 3 July 2009, 50 days after launch. The solar panel always faces the Sun, shadowing the rest of Planck, andoperates at a mean temperature of 384K. At the other end of the spacecraft, the telescope baffle operates at 42.3K and the telescope primary mirror operates at 35.9K. The temperatures of key parts of the instruments are stabilized by both active and passive methods. Temperature fluctuations are driven by changes in the distance from the Sun, sorption cooler cycling and fluctuations in gas-liquid flow, and fluctuations in cosmic ray flux on the dilution and bolometer plates. These fluctuations do not compromise the science data.
Keywords
Cite
@article{arxiv.1101.2023,
title = {Planck Early Results. II. The thermal performance of Planck},
author = {Planck Collaboration and P. A. R. Ade and N. Aghanim and M. Arnaud and M. Ashdown and J. Aumont and C. Baccigalupi and M. Baker and A. Balbi and A. J. Banday and R. B. Barreiro and E. Battaner and K. Benabed and A. Benoit and J. P. Bernard and M. Bersanelli and P. Bhandari and R. Bhatia and J. J. Bock and A. Bonaldi and J. R. Bond and J. Borders and J. Borrill and F. R. Bouchet and B. Bowman and T. Bradshaw and E. Breelle and M. Bucher and C. Burigana and R. C. Butler and P. Cabella and P. Camus and C. M. Cantalupo and B. Cappellini and J. F. Cardoso and A. Catalano and L. Cayon and A. Challinor and A. Chamballu and J. P. Chambelland and J. Charra and M. Charra and L. Y Chiang and C. Chiang and P. R. Christensen and D. L. Clements and B. Collaudin and S. Colombi and F. Couchot and A. Coulais and B. P. Crill and M. Crook and F. Cuttaia and C. Damasio and L. Danese and R. D. Davies and R. J. Davis and P. de Bernardis and G. de Gasperis and A. de Rosa and J. Delabrouille and J. M. Delouis and F. -X. Desert and U. Doerl and K. Dolag and S. Donzelli and O. Dore and M. Douspis and X. Dupac and G. Efstathiou and T. A. Enslin and H. K. Eriksen and F. Finelli and S. Foley and O. Forni and P. Fosalba and J. J. Fourmond and M. Frailis and E. Franceschi and S. Galeotta and K. Ganga and E. Gavila and M. Giard and G. Giardino and Y. Giraud-Heraud and J. Gonzalez-Nuevo and K. M. Gorski and S. Gratton and A. Gregorio and A. Gruppuso and G. Guyot and D. Harrison and G. Helou and S. Henrot-Versille and C. Hernandez-Monteagudo and D. Herranz and S. R. Hildebrandt and E. Hivon and M. Hobson and W. A. Holmes and A. Hornstrup and W. Hovest and R. J. Hoyland and K. M. Huffenberger and U. Israelsson and A. H. Jaffe and W. C. Jones and M. Juvela and E. Keihanen and R. Keskitalo and T. S. Kisner and R. Kneissl and L. Knox and H. Kurki-Suonio and G. Lagache and J. M. Lamarre and P. Lami and A. Lasenby and R. J. Laureijs and C. R. Lawrence and S. Leach and R. Leonardi and C. Leroy and P. B. Lilje and M. Lopez-Caniego and P. M. Lubin and J. F. Macias-Perez and T. Maciaszek and C. J. MacTavish and B. Maffei and D. Maino and N. Mandolesi and R. Mann and M. Maris and E. Martinez-Gonzalez and S. Masi and S. Matarrese and F. Matthai and P. Mazzotta and P. McGehee and P. R. Meinhold and A. Melchiorri and F. Melot and L. Mendes and A. Mennella and M. -A. Miville-Deschenes and A. Moneti and L. Montier and J. Mora and G. Morgante and N. Morisset and D. Mortlock and D. Munshi and A. Murphy and P. Naselsky and A. Nash and P. Natoli and C. B. Netterfield and D. Novikov and I. Novikov and I. J. O'Dwyer and S. Osborne and F. Pajot and F. Pasian and G. Patanchon and D. Pearson and O. Perdereau and L. Perotto and F. Perrotta and F. Piacentini and M. Piat and S. Plaszczynski and P. Platania and E. Pointecouteau and G. Polenta and N. Ponthieu and T. Poutanen and G. Prezeau and M. Prina and S. Prunet and J. L. Puget and J. P. Rachen and R. Rebolo and M. Reinecke and C. Renault and S. Ricciardi and T. Riller and I. Ristorcelli and G. Rocha and C. Rosset and J. A. Rubiino-Martin and B. Rusholme and M. Sandri and D. Santos and B. M. Schaefer and D. Scott and M. D. Seiffert and P. Shellard and G. F. Smoot and J. -L. Starck and P. Stassi and F. Stivoli and V. Stolyarov and R. Stompor and R. Sudiwala and J. -F. Sygnet and J. A. Tauber and L. Terenzi and L. Toffolatti and M. Tomasi and J. -P. Torre and M. Tristram and J. Tuovinen and L. Valenziano and L. Vibert and P. Vielva and F. Villa and N. Vittorio and L. A. Wade and B. D. Wandelt and C. Watson and S. D. M. White and A. Wilkinson and P. Wilson and D. Yvon and A. Zacchei and B. Zhang and A. Zonca},
journal= {arXiv preprint arXiv:1101.2023},
year = {2015}
}
Comments
Accepted by A&A. Also available at http://www.rssd.esa.int