Abstract
Frequency-domain multiplexing (FDM) is the baseline readout system for the X-ray Integral Field Unit on board the Athena mission. Under the FDM scheme, TESs are coupled to a passive LC filter and biased with alternating current (AC bias) at MHz frequencies. Using high-quality-factor LC filters and room-temperature electronics developed at SRON and low-noise two-stage SQUID amplifiers provided by VTT, we have recently demonstrated good performance with the FDM readout of Mo/Au TES calorimeters with Au/Bi absorbers. We have achieved a performance requested for the demonstration model with the single-pixel AC bias (\(\Delta E=1.8\,\hbox {eV}\)) and nine-pixel multiplexing (\(\Delta E=2.6\,\hbox {eV}\)) modes. We have also demonstrated 14-pixel multiplexing with an average energy resolution of 3.3 eV, which is limited by nonfundamental issues related to FDM readout in our laboratory setup.
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Acknowledgements
The authors would like to thank Martijn Schoemans, Dick Boersma, Marcel van Litsenburg, Patrick van Winden and Bert-Joost van Leeuwen for their precious/continuous help. The authors also thank an anonymous referee for constructive comments. SRON is supported financially by NWO, the Netherlands Organization for Scientific Research.
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Akamatsu, H., Gottardi, L., van der Kuur, J. et al. Progress in the Development of Frequency-Domain Multiplexing for the X-ray Integral Field Unit on Board the Athena Mission. J Low Temp Phys 199, 737–744 (2020). https://doi.org/10.1007/s10909-020-02351-3
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DOI: https://doi.org/10.1007/s10909-020-02351-3