NIS tunnel junction as an x-ray photon sensor

Fatma Azgui; Carl A. Mears; Simon E. Labov; Matthias A. Frank; Bernard Sadoulet; E. Brunet; Lawrence J. Hiller; Mark A. Lindeman; Harrie Netel

doi:10.1117/12.218401

1 September 1995 NIS tunnel junction as an x-ray photon sensor

Fatma Azgui, Carl A. Mears, Simon E. Labov, Matthias A. Frank, Bernard Sadoulet, E. Brunet, Lawrence J. Hiller, Mark A. Lindeman, Harrie Netel

Author Affiliations +

Proceedings Volume 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI; (1995) https://doi.org/10.1117/12.218401
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

This work presents the first results of our development of normal-insulating-superconducting tunnel junctions used as energy dispersive detectors for low energy particles. The device described here is a Ag/Al₂O₃/Al tunnel junction of area 1.5 multiplied by 10⁴ micrometer squared with thicknesses of 200 nm for the normal Ag strip and 100 nm for the superconducting Al film. Two different high-speed SQUID systems manufactured by quantum magnetics and HYPRES, respectively, were used for the readout of this device. At 80 mK bath temperature we obtained an energy resolution DeltaE_FWHM equals 250 eV for 5.89 keV x rays absorbed directly in the normal metal. This energy resolution appears to be limited in large part by the observed strong position dependence of the device response.

Citation Download Citation

Fatma Azgui, Carl A. Mears, Simon E. Labov, Matthias A. Frank, Bernard Sadoulet, E. Brunet, Lawrence J. Hiller, Mark A. Lindeman, and Harrie Netel "NIS tunnel junction as an x-ray photon sensor", Proc. SPIE 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI, (1 September 1995); https://doi.org/10.1117/12.218401

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