Performance of Tantalum STJ X-ray Detectors at Elevated Count Rates
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We have developed an X-ray detector system based on Ta superconducting tunnel junctions (STJs) with an energy resolution below 10 eV under 1 keV. A principal advantage of STJs over other low-temperature detectors is their high count rate capability. In this work, we have optimized the operating conditions and digital pulse processing parameters for input count rates up to 25 kcps/pixel. Resolution below 10 eV is maintained up to 2.5 kcps/pixel, and at input rates of 25 kcps per pixel the resolution is 26 eV FWHM at 525 eV.
KeywordsTa STJ Low-temperature detectors Superconducting tunnel junctions X-ray spectroscopy detectors Bench-top X-ray spectroscopy XAS EXAFS
This work was supported by the US National Institutes of Health through Contract 1R43GM122163-0, and by the US Department of Energy through Contracts DE-SC0006214 and DE-SC0004359. This work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.