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Modeling of Planck-high frequency instrument bolometers using non-linear effects in the thermometers

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00189826
Contributor : Simone Lantz <>
Submitted on : Thursday, November 22, 2007 - 2:12:01 PM
Last modification on : Wednesday, October 21, 2020 - 4:32:15 PM

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M. Piat, J.-P. Torre, E. Bréelle, A. Coulais, A. Woodcraft, et al.. Modeling of Planck-high frequency instrument bolometers using non-linear effects in the thermometers. 11th International Workshop on Low Temperature Detectors - LTD-11, Jul 2005, Tokyo, Japan. pp.588-590, ⟨10.1016/J.NIMA.2005.12.076⟩. ⟨in2p3-00189826⟩

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