Effects of spatial nonuniformity of superconducting-tunnel-junction ion detectors on mass spectroscopy

M. Ohkubo, M. Ukibe, N. Saito, A. Kushino, Shingo Ichimura, S. Friedrich

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Spatial uniformity of superconducting tunnel junction detectors with a size of 200 μm is improved by increasing Al thickness of the Nb/Al proximized electrodes in an energy range of 5-10 keV. which is in the same order as an acceleration energy in time-of-flight mass spectroscopy (TOF-MS). It has been confirmed in the TOF experiments with Ta ions and Ta clusters that the proximized junction detectors clearly separate different ionic states and multi-hit events in impact energy spectra, and moreover can reveal the difference in ion species or ion-surface collision dynamics. However, a better spatial uniformity is not always good for TOF-MS, possibly because a detector with the thicker Al layers has a lower superconducting energy gap, which results in an improper detector operation because of a temperature rise due to heat radiation, or the states of the detector surfaces are different.

Original languageEnglish
Pages (from-to)932-935
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2 PART I
DOIs
Publication statusPublished - 2005 Jun 1
Externally publishedYes

Fingerprint

Tunnel junctions
tunnel junctions
nonuniformity
mass spectroscopy
Spectroscopy
Ions
Detectors
detectors
ions
Heat radiation
Energy gap
energy spectra
heat
Electrodes
collisions
electrodes
energy
radiation
Experiments
Temperature

Keywords

  • Mass spectroscopy
  • Particle detectors
  • Superconducting radiation detectors
  • Superconductor-insulator-superconductor devices

ASJC Scopus subject areas

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

Cite this

Effects of spatial nonuniformity of superconducting-tunnel-junction ion detectors on mass spectroscopy. / Ohkubo, M.; Ukibe, M.; Saito, N.; Kushino, A.; Ichimura, Shingo; Friedrich, S.

In: IEEE Transactions on Applied Superconductivity, Vol. 15, No. 2 PART I, 01.06.2005, p. 932-935.

Research output: Contribution to journalArticle

Ohkubo, M. ; Ukibe, M. ; Saito, N. ; Kushino, A. ; Ichimura, Shingo ; Friedrich, S. / Effects of spatial nonuniformity of superconducting-tunnel-junction ion detectors on mass spectroscopy. In: IEEE Transactions on Applied Superconductivity. 2005 ; Vol. 15, No. 2 PART I. pp. 932-935.
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