High-resolution superconducting X-ray spectrometers with an activearea of 282 μm×282 μm
Mears, C.A.
Labov, S.E.
Frank, M.
Netel, H.
Hiller, L.J.
Lindeman, M.A.
Chow, D.
Barfknecht, A.T.
Phys. & Space Technol. Directorate, Lawrence Livermore Nat. Lab., CA;
This paper appears in: Applied Superconductivity, IEEE Transactions on
Publication Date: Jun 1997
Volume: 7,
Issue: 2, Part 3
On page(s): 3415-3418
Meeting Date: 08/25/1996 - 08/30/1996
Location: Pittsburgh, PA, USA
ISSN: 1051-8223
References Cited: 18
CODEN: ITASE9
INSPEC Accession Number: 5707557
Digital Object Identifier: 10.1109/77.622114
Current Version Published: 2002-08-06
Abstract
Superconducting tunnel junctions coupled to superconducting
absorbers may be used as high-resolution, high-efficiency X-ray
spectrometers. We have tested devices with niobium X-ray absorbing
layers coupled to aluminum layers that serve as quasiparticle traps. In
this work we measure the current pulses from a large-area tunnel
junction using an amplifier based on an array of 100 SQUIDs. Using this
amplifier and a 282 μm×282 μm junction, we have measured an
energy resolution of 19 eV FWHM for 1.5 keV X-rays and 21 eV for 2.6 keV
X-rays. The area of this junction is eight times the area of any
junction previously measured to have such high energy resolution
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