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Planck-HFI thermal architecture: from requirements to solutions

Piat, Michel and Lamarre, Jean-Michel and Meissonnier, Julien and Torre, Jean-Pierre and Camus, Philippe and Benoit, Alain and Crussaire, Jean-Pierre and Ade, Peter A. R. and Bock, Jamie and Lange, Andrew and Bhatia, Ravinder S. and Maffei, Bruno and Puget, Jean-Loup and Sudiwala, Rashmi V. (2003) Planck-HFI thermal architecture: from requirements to solutions. In: IR Space Telescopes and Instruments. Proceedings of SPIE. No.4850. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 740-748. ISBN 9780819446299.

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The Planck-High Frequency Instrument (HFI) will use 48 bolometers cooled to 100mK by a dilution cooler to map the Cosmic Microwave Background (CMB) with a sensitivity of ΔT/T~2.10^(-6) and an angular resolution of 5 minutes of arc. This instrument will therefore be about 1000 times more sensitive than the COBE-DMR experiment. This contribution will focus mainly on the thermal architecture of this instrument and its consequences on the fundamental and instrumental fluctuations of the photon flux produced on the detectors by the instrument itself. In a first step, we will demonstrate that the thermal and optical design of the HFI allow to reach the ultimate sensitivity set by photon noise of the CMB at millimeter wavelength. Nevertheless, to reach such high sensitivity, the thermal behavior of each cryogenic stages should also be controlled in order to damp thermal fluctuations that can be taken as astrophysical signal. The requirement in thermal fluctuation on each stage has been defined in the frequency domain to degrade the overall sensitivity by less than 5%. This leads to unprecedented stability specifications that should be achieved down to 16mHz. We will present the design of the HFI thermal architecture, based on active and passive damping, and show how its performances were improved thanks to thermal simulations.

Item Type:Book Section
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Ade, Peter A. R.0000-0002-5127-0401
Bock, Jamie0000-0002-5710-5212
Additional Information:© 2003 Society of Photo-optical Instrumentation Engineers (SPIE).
Subject Keywords:Sub-millimeter bolometric instrumentation — thermal architecture — thermal stability
Series Name:Proceedings of SPIE
Issue or Number:4850
Record Number:CaltechAUTHORS:20190118-084519617
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Official Citation:Michel Piat, Jean-Michel Lamarre, Julien Meissonnier, Jean-Pierre Torre, Philippe Camus, Alain Benoit, Jean-Pierre Crussaire, Peter A. R. Ade, James J. Bock, Andrew E. Lange, Ravinder Bhatia, Bruno Maffei, Jean Loup Puget, Rashmi V. Sudiwala, "Planck-HFI thermal architecture: from requirements to solutions," Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.461777
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92363
Deposited By: Tony Diaz
Deposited On:18 Jan 2019 17:13
Last Modified:16 Nov 2021 03:49

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