Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 199, Issue 3-4, Pages 737-744Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-020-02351-3
Keywords
Transition-edge sensors; X-ray calorimeters; X-ray astronomy; Athena; X-IFU
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Funding
- NWO, the Netherlands Organization for Scientific Research
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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=1.8eV) and nine-pixel multiplexing (Delta E=2.6eV) 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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