A single crystal X-ray detector read out by superconductive tunnel junctions

M.L. Berg, van den; F.B. Kiewiet; M.P. Bruijn; O.J. Luiten; P.A.J. Korte

doi:10.1109/77.783649

A single crystal X-ray detector read out by superconductive tunnel junctions

M.L. Berg, van den, F.B. Kiewiet, M.P. Bruijn, O.J. Luiten, P.A.J. Korte

Coherence and Quantum Technology

Research output: Contribution to journal › Article › Academic › peer-review

7 Citations (Scopus)

Abstract

We have fabricated a prototype imaging X-ray detector, consisting of Al/AlOx/Al/Nb superconductive tunnel junctions sputtered directly on a high purity Nb single crystal with an RRR≈15000. Such a detector in principle offers a high energy resolution, combined with a high quantum efficiency, a large detection area and imaging capabilities. The quasiparticle collection efficiency and consequently the X-ray response of the detector is still very poor due to the large thickness of the crystal (120 µm), but agrees with proximity theory. By irradiation with a focused electron beam of a Low Temperature Scanning Electron Microscope, the spatial and temporal response of the detector has been determined. The derived diffusion coefficient is two orders of magnitude smaller than expected on the basis of the RRR.

Original language	English
Pages (from-to)	2951-2954
Journal	IEEE Transactions on Applied Superconductivity
Volume	9
Issue number	2
DOIs	https://doi.org/10.1109/77.783649
Publication status	Published - 1999

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AU - Berg, van den, M.L.

AU - Kiewiet, F.B.

AU - Bruijn, M.P.

AU - Luiten, O.J.

AU - Korte, P.A.J.

PY - 1999

Y1 - 1999

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AB - We have fabricated a prototype imaging X-ray detector, consisting of Al/AlOx/Al/Nb superconductive tunnel junctions sputtered directly on a high purity Nb single crystal with an RRR≈15000. Such a detector in principle offers a high energy resolution, combined with a high quantum efficiency, a large detection area and imaging capabilities. The quasiparticle collection efficiency and consequently the X-ray response of the detector is still very poor due to the large thickness of the crystal (120 µm), but agrees with proximity theory. By irradiation with a focused electron beam of a Low Temperature Scanning Electron Microscope, the spatial and temporal response of the detector has been determined. The derived diffusion coefficient is two orders of magnitude smaller than expected on the basis of the RRR.

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JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

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ER -

A single crystal X-ray detector read out by superconductive tunnel junctions

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