High resolution tunnel junction extreme ultraviolet detectorslimited by quasiparticle counting statistics
Friedrich, S.
Le Grand, J.B.
Hiller, L.J.
Kipp, J.
Frank, M.
Labov, S.E.
Cramer, S.P.
Barfknecht, A.T.
Lawrence Livermore Nat. Lab., CA;
This paper appears in: Applied Superconductivity, IEEE Transactions on
Publication Date: Jun 1999
Volume: 9,
Issue: 2, Part 3
On page(s): 3330-3333
Meeting Date: 09/13/1998 - 09/18/1998
Location: Palm Desert, CA, USA
ISSN: 1051-8223
References Cited: 21
CODEN: ITASE9
INSPEC Accession Number: 6356803
Digital Object Identifier: 10.1109/77.783742
Current Version Published: 2002-08-06
Abstract
Superconducting tunnel junctions (STJs) can be used as
high-resolution high-count rate photon detectors. They are based on the
measurement of the excess quasiparticle tunneling current caused by the
absorption of a photon in one of the junction electrodes. We have
fabricated Nb-Al-AlOx-Al-Nb tunnel junction detectors with
different sizes and characterized them in synchrotron experiments. We
present a study of the detector performance in the energy band between
50 and 1000 eV. For photon energies below 70 eV, the intrinsic device
resolution of the best STJ devices agrees with the theoretical limit set
by the statistics of the charge generation and tunneling processes
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