Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1743..328l&link_type=abstract
In: EUV, X-ray, and gamma-ray instrumentation for astronomy III; Proceedings of the Meeting, San Diego, CA, July 22-24, 1992 (A9
Astronomy and Astrophysics
Astronomy
2
Elementary Excitations, Superconducting Devices, Trapped Particles, Tunnel Diodes, X Ray Detectors, X Ray Spectroscopy, Aluminum, Cryogenic Cooling, Demagnetization, Niobium, Volt-Ampere Characteristics
Scientific paper
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 exp -6 ohms/sq cm, 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 nonlinear response of the detector.
Barfknecht Andrew T.
Cunningham Charles E.
Goulding Fred S.
Labov Simon E.
Landis Don A.
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