16 research outputs found
The SAFARI Detector System
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) 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.Comment: 7 pages, 3 figures, Proc. SPIE 10708, Millimeter, Submillimeter, and
Far-Infrared Detectors and Instrumentation for Astronomy IX, 107080K (9 July
2018); (fixed typo in abstract
Relationships between marital quality, social, and familial interactions by residential location: Implications for human service professionals
Ultrasensitive TES bolometers for space based FIR astronomy
We present results from the development of a background limited transition edge sensor (TES) bolometer for the wavelength band 30ā60 Ī¼m. The bolometer consists of a TiāAu superconducting thermometer and a Ta radiation absorber deposited on a 200Ī¼mĆ300Ī¼m membrane of SixNy suspended on long, narrow legs. This device is voltage biased and the current through the device is measured by a SQUID amplifier. The thermometer has transition temperature Tcā = ā108āmK and the device is operated from a 70 mK base plate. FIR radiation is coupled into a multimodc horn with entrance aperture of 450 Ī¼m, length 4.5 mm and exit aperture of 45 Ī¼m, which feeds a metal integrating cavity containing the detector. The radiation band is defined by a pair of lowpass and highpass mesh filters in front of the horn. Here we present measurements of optical noise equivalent power (NEP), optical efficiency, dynamic range and time constant. The results show that measured TES detectors are close to meeting the requirement of the āBand 3ā of SAFARI FTS imaging instrument [1] on the SPICA mission [2]