Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Focused Session: Cryogenic Detectors

TT 41.4: Topical Talk

Thursday, March 29, 2012, 16:40–17:05, H 2053

Readout of TESs and MCCs with SQUID current sensors — •Jörn Beyer — Physikalisch-Technsiche Bundesanstalt Berlin

Transition-Edge Sensors (TESs) and Magnetically Coupled Calorimeters (MCCs) are two categories of low-temperature, low-impedance radiation detectors, that have the potential to significantly improve a variety of photon-sensing applications. For example, TES and MCC detectors and systems are under development to detect single THz photons, to enable the measurement of photon number states at telecom wavelengths with very high quantum efficiency or for high-resolution x ray and gamma ray spectrometers. Owing to their excellent sensitivity and dynamic performance as well as their compatibility with the low operating temperatures, current sensors based upon Superconducting Quantum Interference Devices (SQUIDs) are ubiquitously used to read out TESs and MCCs. The required SQUID performance in terms of input referred current noise, dynamic range, bandwidth, acceptable power dissipation and potential back-action can vary substantially for different TES or MCC detectors. Consequently, suitable SQUID current sensors need to be adapted to the readout configuration at hand. Ground- and satellite-based astronomy instruments that use thousands of TES pixels set particularly stringent requirements on the detector readout and require SQUID-based multiplexers. This contribution will review concepts and performance of state-of-the-art SQUID current sensors for single TES and MCC readout as well as SQUID multiplexing techniques.