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Proceedings Paper

Superconducting tunnel-junction x-ray detectors with niobium absorbers and aluminum quasi-particle traps
Author(s): Simon E. Labov; Carl A. Mears; George W. Morris; Charles E. Cunningham; Mark A. LeGros; Eric H. Silver; Andrew T. Barfknecht; Norman W. Madden; Don A. Landis; Fred S. Goulding; Roger W. Bland; Kenneth E. Laws
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Paper Abstract

We are developing superconducting tunnel junction devices for use as high-resolution, high- efficiency x-ray spectrometers. We have tested devices with niobium x-ray absorbing layers coupled to aluminum layers which serve as quasiparticle traps. These devices were fabricated photolithographically using a modified niobium/aluminum/niobium trilayer fabrication process. Our first devices have a very thin barrier with specific normal state resistance of 1.5 X 10-6 (Omega) cm2, and also exhibit very low leakage current of 15 nA below 200 mK. The energy resolution at 6 keV is 190 eV FWHM, and is limited both by electronic noise and by the non-linear response of the detector.

Paper Details

Date Published: 8 October 1992
PDF: 11 pages
Proc. SPIE 1743, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy III, (8 October 1992); doi: 10.1117/12.130694
Show Author Affiliations
Simon E. Labov, Lawrence Livermore National Lab. (United States)
Carl A. Mears, Lawrence Livermore National Lab. (United States)
George W. Morris, Lawrence Livermore National Lab. (United States)
Charles E. Cunningham, Lawrence Livermore National Lab. (United States)
Mark A. LeGros, Lawrence Livermore National Lab. (United States)
Eric H. Silver, Lawrence Livermore National Lab. (United States)
Andrew T. Barfknecht, MTS Conductus Inc. (United States)
Norman W. Madden, Lawrence Berkeley Lab. (United States)
Don A. Landis, Lawrence Berkeley Lab. (United States)
Fred S. Goulding, Lawrence Berkeley Lab. (United States)
Roger W. Bland, San Francisco State Univ. (United States)
Kenneth E. Laws, San Francisco State Univ. (United States)


Published in SPIE Proceedings Vol. 1743:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy III
Oswald H. W. Siegmund, Editor(s)

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