Abstract
We are developing X-ray microcalorimeters as a backup option for the baseline detectors in the X-IFU instrument on board the ATHENA space mission led by ESA and to be launched in the early 2030s. 5 \(\times \) 5 mixed arrays with TiAu transition-edge sensor (TES), which have different high aspect ratios and thus high resistances, have been designed and fabricated to meet the energy resolution requirement of the X-IFU instrument. Such arrays can also be used to optimize the performance of the frequency domain multiplexing (FDM) readout and lead to the final steps for the fabrication of a large detector array. In this work, we present the experimental results from tens of the devices with an aspect ratio (length-to-width) ranging from 1-to-1 up to 6-to-1, measured in a single-pixel mode with a FDM readout system developed at SRON/VTT. We observed a nominal energy resolution of about 2.5 eV at 5.9 keV at bias frequencies ranging from 1 to 5 MHz. These detectors are proving to be the best TES microcalorimeters ever reported in Europe, intending to meet the requirements of the X-IFU instrument, but also those of other future challenging X-ray space missions, fundamental physics experiments, plasma characterization and material analysis.
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Acknowledgements
This work is partly funded by European Space Agency (ESA) and coordinated with other European efforts under ESA CTP contract ITT AO/1-7947/14/NL/BW. It has also received funding from the European Union’s Horizon 2020 Programme under the AHEAD (Activities for the High-Energy Astrophysics Domain) project with Grant Agreement Number 654215.
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Taralli, E., Gottardi, L., Nagayoshi, K. et al. Characterization of High Aspect-Ratio TiAu TES X-ray Microcalorimeter Array Under AC Bias. J Low Temp Phys 199, 80–87 (2020). https://doi.org/10.1007/s10909-019-02254-y
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DOI: https://doi.org/10.1007/s10909-019-02254-y