Impact of Sorption-Cooler induced temperature fluctuations on Planck-LFI: evaluation using data measured in flight.
Date Issued
2010
Author(s)
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Zonca, Andrea
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GREGORIO, Anna
Abstract
In this technical note we present an evaluation of the effect of sorption cooler induced temperature
fluctuations Planck-LFI using temperature data measured in flight. In particular we
analyse three scenarios in order to evaluate the effect of TSA capability to damp temperature
fluctuations at the sorption cooler cold end. The first scenario is one in which the TSA is
completely off and the LFI is subject to the complete spectrum of the cold end temperature
variations. The second scenario is one in which the TSA is working nominally and the third
scenario is one in which the TSA is working in a not-nominal situation because of sorption cooler
aging. The analysis, performed with two, independent methods, show clearly a negative
impact of the increased level of temperature fluctuations on the LFI maps. In particular, estimates
of the effect in case the TSA were kept off for a significant fraction of the sky coverage
indicate that the effect would not be compatible with the LFI scientific requirements.
Volume
PL-LFI-PST-TN-096
Rights
open.access
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PST-TN-096.pdf
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