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Superconducting Tunnel Junctions for High-Precision EUV Spectroscopy

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Abstract

We have characterized the photon response of superconducting tunnel junctions in the extreme ultraviolet energy range below 100 eV with a pulsed 355 nm laser. The detectors are operated at rates up to 5000 counts/s, are very linear in energy and have an energy resolution between 0.9 and 2 eV. We observe multiple peaks that correspond to an integer number of photons with a Poissonian probability distribution and that can be used for high-accuracy energy calibration. The uncertainty of the centroid depends on the detector resolution and the counting statistics and can be as low as 1 meV for well-separated peaks with \(>\)10\(^5\) counts. We discuss the precision of the peak centroid as a function of detector resolution and total number of counts and the accuracy of the energy calibration.

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Acknowledgments

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. It was funded by the LLNL LDRD Grant 14-LW-073 and by U.S. DOE Grants DE-SC0004359 and DE-SC0006214.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA

    F. Ponce & S. Friedrich

  2. University of California, Davis, Davis, CA, 95616, USA

    F. Ponce

  3. STAR Cryoelectronics, Santa Fe, NM, 87508, USA

    M. H. Carpenter & R. Cantor

Authors
  1. F. Ponce
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  2. M. H. Carpenter
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  3. R. Cantor
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  4. S. Friedrich
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Correspondence to F. Ponce.

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Ponce, F., Carpenter, M.H., Cantor, R. et al. Superconducting Tunnel Junctions for High-Precision EUV Spectroscopy. J Low Temp Phys 184, 694–698 (2016). https://doi.org/10.1007/s10909-015-1443-2

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  • DOI: https://doi.org/10.1007/s10909-015-1443-2

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