TES detector noise limited readout using SQUID multiplexers

Details TES detector noise limited readout using SQUID multiplexers TES detector noise limited readout using SQUID multiplexers

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605..321s&link_type=abstract

LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p

Computer Science

Performance

5

Superconducting Quantum Interference Devices, Signal Processing Electronics, Astronomical And Space-Research Instrumentation

Scientific paper

The availability of superconducting Transition Edge Sensors (TES) with large numbers of individual detector pixels requires multiplexers for efficient readout. The use of multiplexers reduces the number of wires needed between the cryogenic electronics and the room temperature electronics and cuts the number of required cryogenic amplifiers. We are using an 8 channel SQUID multiplexer to read out one-dimensional TES arrays which are used for submillimeter astronomical observations. We present results from test measurements which show that the low noise level of the SQUID multiplexers allows accurate measurements of the TES Johnson noise, and that in operation, the readout noise is dominated by the detector noise. Multiplexers for large number of channels require a large bandwidth for the multiplexed readout signal. We discuss the resulting implications for the noise performance of these multiplexers which will be used for the readout of two dimensional TES arrays in next generation instruments. .

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