Photon energy dependence of spatial non-uniformity in super-conducting tunnel junction detectors between 200 ev and 10 keV

M. Ohkubo, M. Ukibe, T. Zama, T. Ikeuchi, M. Katagiri, S. Ichimura

Research output: Contribution to journalArticle

3 Citations (Scopus)


It has been demonstrated by Low-Temperature Scanning Synchrotron Microscope that the spatial profiles of Nb/Al/AlOx/Al/Nb detectors are abnormally large in an energy range between 2 and 10keV, and thus the detectors produce no clear total absorption peaks. Below 2keV, on the other hand, full illumination experiments have afforded the evidence that the spatial uniformity is significantly improved, for example, an 100μm square junction has an intrinsic energy resolution of 5.4eV at 200eV. These results reconfirm that carefully designed junction detectors with a reasonable size are ideal for energy-dispersive spectroscopy in a soft X-ray range.

Original languageEnglish
Pages (from-to)231-233
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
Publication statusPublished - 2004 Mar 11



  • Spatial profile
  • Superconducting tunnel junction
  • Synchrotron radiation
  • X-ray spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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