High-resolution superconducting x-ray spectrometers with an active area of 282 pm × 282 μm

C. A. Mears, Simon E. Labov, Matthias Frank, H. Netel

Research output: Contribution to journalArticle

18 Scopus citations

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 um × 282 (im 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.

Original languageEnglish (US)
Pages (from-to)3415-3418
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume7
Issue number2 PART 3
StatePublished - Dec 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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