Fiske modes in superconducting tunnel junction detectors

Authors
Friedrich, S Cunningham, MF Frank, M Labov, SE Barfknecht, AT Cramer, SP
Citation
S. Friedrich et al., Fiske modes in superconducting tunnel junction detectors, NUCL INST A, 444(1-2), 2000, pp. 151-155
Citations number
20
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
444
Issue
1-2
Year of publication
2000
Pages
151 - 155
Database
ISI
SICI code
0168-9002(20000411)444:1-2<151:FMISTJ>2.0.ZU;2-1
Abstract
We are developing superconducting tunnel junction (STJ) X-ray spectrometers with high-energy resolution( < 10 eV for keV X-rays) and high count rate c apabilities ( > 10 000 counts/s). We have examined the influence of Fiske m ode resonances on energy resolution, maximum count rate and area of Nb-Al-A lOx-Al-Nb STJ detectors. At low count rate, these detectors have an energy resolution of 2.3 eV FWHM at 70 eV. At 20 000 counts/s, the resolution is 8 .2 eV FWHM at 277 eV. We observe the optimum detector performance when the influence of Fiske modes is minimized. (C) 2000 Published by Elsevier Scien ce B.V. All rights reserved.