Single Pixel Performance of a 32 × 32 Ti/Au TES Array With Broadband X-Ray Spectra
IEEE Transactions on Applied Superconductivity(2021)
摘要
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 × 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
$_{\mathrm{FWHM}}$
= 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 d), 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
$_{\mathrm{FWHM}}$
= 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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关键词
Energy calibration,energy resolution,MXS,TES,X-IFU,x-ray detectors
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