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 (ΔE=1.8eV) and nine-pixel multiplexing (ΔE=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.
Original language | English |
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Pages (from-to) | 737-744 |
Journal | Journal of Low Temperature Physics |
Volume | 199 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 1 May 2020 |
MoE publication type | A1 Journal article-refereed |
Funding
SRON is supported financially by NWO, the Netherlands Organization for Scientific Research.
Keywords
- Athena
- Transition-edge sensors
- X-IFU
- X-ray astronomy
- X-ray calorimeters