SQUID Noise in a 176-Pixel FDM Demonstrator for the SAFARI Far-Infrared Spectrometer

We are developing the frequency-domain multiplexing (FDM) readout for the SAFARI far-infrared spectrometer on board the SPICA space observatory. Each readout channel comprises a set of ~ 160 TESs and LC filters and is read out with a SQUID preamplifier. Baseband feedback is applied to overcome the d...

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Bibliographic Details
Published in:	Journal of low temperature physics Vol. 199; no. 3-4; pp. 723 - 729
Main Authors:	Audley, Michael D., Wang, Qian, Hijmering, Richard A., Khosropanah, Pourya, de Lange, Gert, van der Linden, Anton J., Ridder, Marcel L., Taralli, Emanuele
Format:	Journal Article
Language:	English
Published:	New York Springer US 01-05-2020 Springer Nature B.V
Subjects:	Bolometers Characterization and Evaluation of Materials Condensed Matter Physics Far infrared radiation Frequency division multiplexing Infrared spectrometers Low temperature physics Magnetic Materials Magnetism Physics Physics and Astronomy Pixels Squid SQUID noise TES bolometer array FDM readout SAFARI
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Summary:	We are developing the frequency-domain multiplexing (FDM) readout for the SAFARI far-infrared spectrometer on board the SPICA space observatory. Each readout channel comprises a set of ~ 160 TESs and LC filters and is read out with a SQUID preamplifier. Baseband feedback is applied to overcome the dynamic range limitations of the SQUID. We have carried out extensive characterization of a test readout system coupled to a 176-pixel TES bolometer array in order to understand and optimize the system. We present our latest measurements of this 176-pixel FDM demonstrator, focusing on the noise contribution from the SQUID.
ISSN:	0022-2291 1573-7357
DOI:	10.1007/s10909-020-02399-1