Performance of NbSi transition-edge sensors readout with a 128 MUX factor for the QUBIC experiment

M. Salatino*, B. Bélier, C. Chapron, D. T. Hoang, S. Maestre, S. Marnieros, W. Marty, L. Montier, M. Piat, D. Prêle, D. Rambaud, J. P. Thermeau, S. A. Torchinsky, S. Henrot-Versillé, F. Voisin, P. Ade, G. Amico, D. Auguste, J. Aumont, S. BanfiG. Barbarán, P. Battaglia, E. Battistelli, A. Baù, D. Bennett, L. Bergé, J. Ph Bernard, M. Bersanelli, M. A. Bigot-Sazy, N. Bleurvacq, J. Bonaparte, J. Bonis, G. Bordier, E. Bréelle, D. Burke, G. Coppi, B. García, A. Gault, M. González, B. Maffei, A. J. May, M. A. McCulloch, S. Melhuish, J. A. Murphy, J. D. Murphy, L. Piccirillo, G. Pisano, C. Tucker, G. Tucker, B. Watson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

QUBIC (the Q and U Bolometric Interferometer for Cosmology) is a ground-based experiment which seeks to improve the current constraints on the amplitude of primordial gravitational waves. It exploits the unique technique, among Cosmic Microwave Background experiments, of bolometric interferometry, combining together the sensitivity of bolometric detectors with the control of systematic effects typical of interferometers. QUBIC will perform sky observations in polarization, in two frequency bands centered at 150 and 220 GHz, with two kilo-pixel focal plane arrays of NbSi Transition-Edge Sensors (TES) cooled down to 350 mK. A subset of the QUBIC instrument, the so called QUBIC Technological Demonstrator (TD), with a reduced number of detectors with respect to the full instrument, will be deployed and commissioned before the end of 2018. The voltage-biased TES are read out with Time Domain Multiplexing and an unprecedented multiplexing (MUX) factor equal to 128. This MUX factor is reached with two-stage multiplexing: a traditional one exploiting Superconducting QUantum Interference Devices (SQUIDs) at 1K and a novel SiGe Application-Specific Integrated Circuit (ASIC) at 60 K. The former provides a MUX factor of 32, while the latter provides a further 4. Each TES array is composed of 256 detectors and read out with four modules of 32 SQUIDs and two ASICs. A custom software synchronizes and manages the readout and detector operation, while the TES are sampled at 780 Hz (100kHz/128 MUX rate). In this work we present the experimental characterization of the QUBIC TES arrays and their multiplexing readout chain, including time constant, critical temperature, and noise properties.

Original languageEnglish
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
EditorsJonas Zmuidzinas, Jian-Rong Gao
PublisherSPIE
ISBN (Print)9781510619692
DOIs
Publication statusPublished - 2018
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 - Austin, United States
Duration: 12 Jun 201815 Jun 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10708
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018
Country/TerritoryUnited States
CityAustin
Period12/06/1815/06/18

Keywords

  • Bolometric Interferometry
  • CMB instrumentation
  • Cosmic Microwave Background
  • SiGe ApplicationSpecific Integrated Circuit
  • Superconducting QUantum Interference Device
  • the QUBIC experiment
  • TimeDomain Multiplexing
  • Transition-Edge Sensor

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