Spatially resolved study of superconducting tunnel junctions X-ray detectors by low temperature scanning synchrotron microscopy

Harald Pressler, Masataka Ohkubo, Masaki Koike, Tatsuya Zama, Daiji Fukuda, Naoto Kobayashi

Research output: Contribution to journalArticle

6 Citations (Scopus)


A low temperature scanning synchrotron microscope (LTSSM) has been developed for spatial analysis of superconducting tunnel junction X-ray detectors. One and two-dimensional images of the detector response to X-rays were measured by scanning the junctions kept at a working temperature of about 0.4 K with a highly collimated synchrotron radiation beam. The collimation was performed by inserting a pinhole mounted on a scanning unit into the synchrotron radiation in the range of 3-6 keV. The spatial resolution of the LTSSM is between 5 and 10 micrometer. The present results indicate a large discrepancy between the experimental spatial response and a quasiparticle diffusion and edge-loss model. The LTSSM plays an important role in the development of cryogenic X-ray detectors.

Original languageEnglish
Pages (from-to)696-699
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1 I
Publication statusPublished - 2001 Mar
Externally publishedYes



  • Image processing
  • Superconducting devices
  • Superconducting tunnel junctions
  • X-ray detectors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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