Abstract
We are developing Ta-based superconducting tunnel junction (STJ) X-ray detectors for high-resolution soft X-ray spectroscopy at the synchrotron. For scaling to large detector arrays, we have also built a compact, low-cost, remote-controllable preamplifier with <3 eV electronic noise. Current Ta-STJs attain an energy resolution between 6.5 and 9 eV FWHM for energies up to ∼2 keV, and can be operated at rates up to ∼5,000 counts/s as long as the signals decay with a single exponential time constant.
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