Susceptibility Study of TES Micro-calorimeters for X-ray Spectroscopy Under FDM Readout

D. Vaccaro (Corresponding Author), H. Akamatsu, L. Gottardi, J. van der Kuur, E. Taralli, M. de Wit, M. P. Bruijn, R. den Hartog, M. Kiviranta, A. J. van der Linden, K. Nagayoshi, K. Ravensberg, M. L. Ridder, S. Visser, B. D. Jackson, J. R. Gao, R. W.M. Hoogeveen, J. W.A. den Herder

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


We present a characterization of the sensitivity of TES X-ray micro-calorimeters to environmental conditions under frequency-domain multiplexing (FDM) readout. In the FDM scheme, each TES in a readout chain is in series with a LC band-pass filter and AC biased with an independent carrier at MHz range. Using TES arrays, cold readout circuitry and warm electronics fabricated at SRON and SQUIDs produced at VTT Finland, we characterize the sensitivity of the detectors to bias voltage, bath temperature and magnetic field. We compare our results with the requirements for the Athena X-IFU instrument, showing the compliance of the measured sensitivities. We find in particular that FDM is intrinsically insensitive to the magnetic field because of TES design and AC readout.

Original languageEnglish
Pages (from-to)562–569
Number of pages8
JournalJournal of Low Temperature Physics
Publication statusPublished - Nov 2022
MoE publication typeA1 Journal article-refereed


  • FDM
  • Susceptibility
  • TES
  • X-ray spectroscopy


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