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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Veröffentlicht in:	Journal of low temperature physics 2020-05, Vol.199 (3-4), p.723-729
Hauptverfasser:	Audley, Michael D., Wang, Qian, Hijmering, Richard A., Khosropanah, Pourya, de Lange, Gert, van der Linden, Anton J., Ridder, Marcel L., Taralli, Emanuele
Format:	Artikel
Sprache:	eng
Schlagworte:	Bolometers Characterization and Evaluation of Materials Condensed Matter Physics Far infrared radiation Frequency division multiplexing Infrared spectrometers Low temperature physics Magnetic Materials Magnetism Physical Sciences Physics Physics and Astronomy Physics, Applied Physics, Condensed Matter Pixels Science & Technology Squid
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Beschreibung
Zusammenfassung:	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