159 articles – 1999 Notices  [english version]
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11th International Workshop on Low Temperature Detectors - LTD-11, Tokyo : Japon (2005)
Modeling of Planck-high frequency instrument bolometers using non-linear effects in the thermometers
M. Piat1, J.-P. Torre2, E. Bréelle1, A. Coulais3, A. Woodcraft, W. Holmes, R. Sudiwala
PLANCK, PLANCK-HFI Collaboration(s)

The Planck satellite, which is planned to be launched in 2007, is dedicated to surveying the Cosmic Microwave Background (CMB) to a high precision. Aboard this mission, the High-Frequency Instrument (HFI) will use 52 NTD Ge spiderweb bolometers made by Caltech-JPL and cooled to 100 mK by a dilution cooler. In this paper, we present a model of these detectors that includes non-linear effects seen in NTD Ge thermometers: electron-phonon decoupling and electrical field effect. We show that this model leads to consider only electrical field effect. Furthermore, the optical characterization of the HFI bolometers clearly shows a non-ideal behavior that is explained by non-linear effects in the thermometer. We finally show that these effects have to be taken into account for optimized CMB observations and to fully understand the physics of semi-conducting bolometers.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  SA - Service d'aéronomie
3 :  LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
Spider web bolometer – Planck HFI – Electrical field effect – Electron-phonon decoupling effect