Performance of TES X-ray Microcalorimeters with AC Bias Read-Out at MHz Frequencies

H Akamatsu (Corresponding Author), L Gottardi, J Adams, S Bandler, M Bruijn, J Chervenak, M Eckart, F Finkbeiner, R den Hartog, H Hoevers, R Kelley, C Kilbourne, J van der Kuur, A J van den Linden, F Porter, J Sadleir, S Smith, Mikko Kiviranta

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)


    At SRON we are developing Frequency Domain Multiplexing for the read-out of superconducting transition edge sensor microcalorimeters for future X-ray astrophysical missions. We will report on the performance of Goddard Space Flight Center pixels under AC bias in the MHz frequency range. Superconducting flux transformers are used to improve the impedance matching between the low ohmic TESs and the SQUID. We connected 5 pixels to the LC filters with resonant frequencies ranging between 1 and 5 MHz. For X-ray photons of 6 keV we measured a best X-ray energy resolution of 3.6 eV at 1.4 MHz, consistent with the integrated Noise Equivalent Power. In addition, we improved the electrical circuit by optimizing the coupling ratio of the impedance matching transformer. In addition, we improved electrical circuit for impedance matching; modified transformer coupling ratio. As a result, we got the integrated noise equivalent power resolution of 2.7 eV at 2.5 MHz. A characterization of the detector response as a function of the AC bias voltage, bias frequency and the applied magnetic field is presented
    Original languageEnglish
    Pages (from-to)591-596
    Number of pages5
    JournalJournal of Low Temperature Physics
    Issue number3-4
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


    • Microcalorimeter
    • transition edge sensor
    • X-ray


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