Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Symposium: Cryodetectors and SQUID

TT 12.1: Hauptvortrag

Dienstag, 26. Februar 2008, 09:30–10:00, H 0104

SQUID multiplexers for low-temperature detectors — •K.D. Irwin, J.A. Beall, H.M. Cho, W.B. Doriese, W.D. Duncan, G.C. Hilton, R. Horansky, N. Jethava, J.A.B. Mates, C.D. Reintsema, D. Schmidt, J.N. Ullom, L.R. Vale, Y. Xu, and K. Yoon — National Institute of Standards and Technology, Boulder, Colorado 80305

The development of arrays of low-temperature detectors, including the superconducting transition-edge sensor (TES), has provided new capabilities for applications including astronomy, particle physics, and nuclear materials analysis. These applications require the implementation of large arrays of sensors. Due to constraints on cryogenic wiring heat load and complexity, it is impractical to route wires from room temperature to every pixel in a large low-temperature detector array. We have developed multiplexed readout circuits based on Superconducting Quantum Interference Devices (SQUIDs) to meet this need. We are implementing two SQUID multiplexer architectures: time-division multiplexed dc SQUID arrays operated at MHz frequencies, and frequency-division multiplexed rf SQUID arrays operated at microwave frequencies. Kilopixel TES arrays based on time-division multiplexed dc SQUIDs have reached maturity, and are being deployed in multiple instruments. Microwave frequency-division-multiplexed arrays of dissipationless rf SQUIDs coupled to superconducting microresonators have the promise of scaling to much larger array implementations in the future. The current status of these technologies, and future directions will be described.