The SAFARI detector system
M. D. Audley (SRON–Netherlands Institute for Space Research)
Gert de Lange (SRON–Netherlands Institute for Space Research)
J.R. Gao (TU Delft - QN/Gao Lab, SRON–Netherlands Institute for Space Research)
BD Jackson (SRON–Netherlands Institute for Space Research)
Richard Hijmering (SRON–Netherlands Institute for Space Research)
Marcel Ridder (SRON–Netherlands Institute for Space Research)
Marcel P. Bruijn (SRON–Netherlands Institute for Space Research)
Peter R. Roelfsema (SRON–Netherlands Institute for Space Research)
Peter A.R. Ade (Cardiff University)
Stafford Withington (University of Cambridge)
Charles M. Bradford (Jet Propulsion Lab, Pasadena, CA)
Neal A. Trappe (Maynooth University)
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Abstract
We give an overview of the baseline detector system for SAFARI, the prime focal-plane instrument on board the proposed space infrared observatory, SPICA. SAFARI's detectors are based on superconducting Transition Edge Sensors (TES) to provide the extreme sensitivity (dark NEP≤2×10-19W/√Hz) needed to take advantage of SPICA's cold (<8 K) telescope. In order to read out the total of ∼3500 detectors we use frequency domain multiplexing (FDM) with baseband feedback. In each multiplexing channel, a two-stage SQUID preamplifier reads out 160 detectors. We describe the detector system and discuss some of the considerations that informed its design.
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