11 July 2008 Simulation of the Planck-HFI thermal control system
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Abstract
The core of the High Frequency Instrument (HFI) on-board the Planck satellite consists of 52 bolometric detectors cooled at 0.1 Kelvin. In order to achieve such a low temperature, the HFI cryogenic architecture consists in several stages cooled using different active coolers. These generate weak thermal fluctuations on the HFI thermal stages. Without a dedicated thermal control system these fluctuations could produce unwanted systematic effects, altering the scientific data. The HFI thermal architecture allows to minimise these systematic effects, thanks to passive and active control systems described in this paper. The passive and active systems are used to damp the high and low frequency fluctuations respectively. The results of the simulation of these active and passive control systems are presented here. These simulations based on the use of thermal transfer functions for the thermal modelling can then be used for finding the optimal working point of the HFI PID active thermal control system.
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Christophe Leroy, Mathieu Maisonneuve, Michel Piat, Jean-François Trouilhet, Dave Pearson, Christophe Camier, Simon Guibert, "Simulation of the Planck-HFI thermal control system", Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 701713 (11 July 2008); doi: 10.1117/12.788330; https://doi.org/10.1117/12.788330
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