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Proceedings Paper

NIS tunnel junction as an x-ray photon sensor
Author(s): Fatma Azgui; Carl A. Mears; Simon E. Labov; Matthias A. Frank; Bernard Sadoulet; E. Brunet; Lawrence J. Hiller; Mark A. Lindeman; Harrie Netel
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Paper 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 DeltaEFWHM 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.

Paper Details

Date Published: 1 September 1995
PDF: 6 pages
Proc. SPIE 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI, (1 September 1995); doi: 10.1117/12.218401
Show Author Affiliations
Fatma Azgui, Univ. of California/Berkeley, Lawrence Livermore National Lab. (USA), and Univ. STHB (Algeria)
Carl A. Mears, Lawrence Livermore National Lab. (United States)
Simon E. Labov, Lawrence Livermore National Lab. (United States)
Matthias A. Frank, Lawrence Livermore National Lab. (United States)
Bernard Sadoulet, Univ. of California/Berkeley (United States)
E. Brunet, Lawrence Livermore National Lab. (United States)
Lawrence J. Hiller, Lawrence Livermore National Lab. (United States)
Mark A. Lindeman, Lawrence Livermore National Lab. (United States)
Harrie Netel, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 2518:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI
Oswald H. W. Siegmund; John V. Vallerga, Editor(s)

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