Effects of fluxoid trapping on signal creation in superconducting tunnel junction X-ray detectors

M. Ohkubo*, K. Tanabe, K. Suzuki, H. Pressler, M. Ukibe, Naoto Kobayashi, T. Nakamura, M. Kishimoto, M. Katagiri, D. Fukuda, H. Takahashi, M. Nakazawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Trapping of fluxoid quanta influences the performance of tunnel junction X-ray detectors. It has been found that the trapped vortices corresponding to a terrestrial magnetic field are enough for charge output and quasiparticle losstime to decrease by factors of two and three, respectively. This result leads to an effective vortex radius of Reff = 3ξ, which is in a good agreement with a Golubov's calculation. Magnetic images by a scanning SQUID microscope show that the trapping takes place at junction edges or inside the junction at random. The random trapping may cause an instability of the detector performance. On average, the cooling in a perpendicular magnetic field results in the trapping of the corresponding vortex density, that is B/Φ0.

Original languageEnglish
Pages (from-to)237-240
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 2000 Apr 7
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics


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