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Two-Stage SQUID Multiplexers for TES Readout

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Abstract

SQUID multiplexers (SQMUX) are essential components for large arrays of TES-based detectors. This paper presents the analysis of multiplexers with two SQUID-stages (2-stage SQMUX) that allows for improved noise performance compared to existing SQMUX configurations. In the 2-stage SQMUX configurations here discussed, each TES is associated with its front-end SQUID. Flux-actuated, SQUID-based switches are used to encode the output current of the front-end SQUIDs. This encoding can be done such that code division (CD) or time division (TD) multiplexing is realized. The encoded output signals of all front-end SQUIDs are then coupled via a superconducting intermediate loop to a second-stage SQUID.

We discuss the expected noise and dynamic performance of 2-stage CD-SQMUX and 2-stage TD-SQMUX based on measured parameters of existing switches and SQUID current sensors.

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Authors and Affiliations

  1. I.N.F.N. Sezione di Genova, Via Dodecaneso 33, 16146, Genoa, Italy

    R. Vaccarone

  2. Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587, Berlin, Germany

    J. Beyer

Authors
  1. R. Vaccarone
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  2. J. Beyer
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Correspondence to R. Vaccarone.

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Vaccarone, R., Beyer, J. Two-Stage SQUID Multiplexers for TES Readout. J Low Temp Phys 167, 678–683 (2012). https://doi.org/10.1007/s10909-012-0493-y

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  • DOI: https://doi.org/10.1007/s10909-012-0493-y

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