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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Frontiers in Cryogenic Particle Detection

TT 39.3: Hauptvortrag

Mittwoch, 18. März 2020, 16:00–16:30, HSZ 03

LTS dc-SQUID sensors for TES and MMC readout — •Jörn Beyer — Physikalisch-Technische Bundesanstalt, Berlin, Germany

The superconducting quantum interference device (SQUID) is a highly sensitive detector for magnetic flux or any physical quantity that can be efficiently converted into flux. Current sensors based on LTS SQUIDs are practically unrivalled to operate two categories of superconducting cryogenic detectors, namely transition edge sensors (TESs) and metallic magnetic calorimeters (MMCs). Applications of TES detectors range from the bolometric detection of sub-millimeter waves to calorimetric detection of X- and gamma-rays. MMCs so far address primarily high-energy applications, for instance spectrometry of soft and hard X-rays or radionuclide spectrometry. In this contribution, basic technology and design concepts of LTS dc-SQUID current sensors are presented. Efficient signal coupling as well as circuit configurations such as SQUID cascades, SQUID arrays, SQUID sensors with differential output and SQUID-based multiplexers will be discussed. LTS dc-SQUIDs already provide adequate performance for a range of readout applications of single TESs and MMCs as well as of arrays of these detectors. Still, further improvement of sensor functionality and noise is possible. Refined lithographic technology can be employed to realize SQUID sensors with sub-micrometer-sized Josephson junctions as well as fine-pitch superconducting pick-up coils. Recent progress on these developments will be presented.