Abstract
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 language | English |
|---|---|
| Pages (from-to) | 562–569 |
| Journal | Journal of Low Temperature Physics |
| Volume | 209 |
| DOIs | |
| Publication status | Published - Nov 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
SRON is financially supported by the Nederlandse Organisatie voor Wetenschappelijk Onderzoek. This work is part of the research programme Athena with project number 184.034.002, which is (partially) financed by the Dutch Research Council (NWO). The SRON TES arrays used for the measurements reported in this paper is developed in the framework of the ESA/CTP grant ITT AO/1-7947/14/NL/BW.
Keywords
- FDM
- Susceptibility
- TES
- X-ray spectroscopy