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arXiv · 2102.08103

Single pixel performance of a 32$\times$32 Ti/Au TES array with broadband X-ray spectra

Matteo D'Andrea·Emanuele Taralli·Hiroki Akamatsu·Luciano Gottardi·Kenichiro Nagayoshi·Kevin Ravensberg·Marcel L. Ridder·Davide Vaccaro·Cor P. de Vries·Martin de Wit·Marcel P. Bruijn·Ruud W. M. Hoogeveen·Jian-Rong Gao
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Abstract

We are developing a kilo-pixels Ti/Au TES array as a backup option for Athena X-IFU. Here we report on single-pixel performance of a 32$\times$32 array operated in a Frequency Division Multiplexing (FDM) readout system, with bias frequencies in the range 1-5 MHz. We have tested the pixels response at several photon energies, by means of a $^{55}$Fe radioactive source (emitting Mn-K$\alpha$ at 5.9 keV) and a Modulated X-ray Source (MXS, providing Cr-K$\alpha$ at 5.4 keV and Cu-K$\alpha$ at 8.0 keV). First, we report the procedure used to perform the detector energy scale calibration, usually achieving a calibration accuracy better than $\sim$ 0.5 eV in the 5.4 - 8.9 keV energy range. Then, we present the measured energy resolution at the different energies (best single pixel performance: $\Delta$E$_{FWHM}$ = 2.40 $\pm$ 0.09 eV @ 5.4 keV; 2.53 $\pm$ 0.10 eV @ 5.9 keV; 2.78 $\pm$ 0.16 eV @ 8.0 keV), investigating also the performance dependency from the pixel bias frequency and the count rate. Thanks to long background measurements ($\sim$ 1 day), we finally detected also the Al-K$\alpha$ line at 1.5 keV, generated by fluorescence inside the experimental setup. We analyzed this line to obtain a first assessment of the single-pixel performance also at low energy ($\Delta$E$_{FWHM}$ = 1.91 eV $\pm$ 0.21 eV @ 1.5 keV), and to evaluate the linearity of the detector response in a large energy band (1.5 - 8.9 keV).

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Matteo D'Andrea, Emanuele Taralli, Hiroki Akamatsu, Luciano Gottardi, Kenichiro Nagayoshi, Kevin Ravensberg, Marcel L. Ridder, Davide Vaccaro, Cor P. de Vries, Martin de Wit, Marcel P. Bruijn, Ruud W. M. Hoogeveen, Jian-Rong Gao. 2021-02-16. Single pixel performance of a 32$\times$32 Ti/Au TES array with broadband X-ray spectra. https://doi.org/10.1109/tasc.2021.3065303

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