Line-splitting in high-resolution superconducting tunnel junction EUV detectors

Friedrich, S.; Hiller, L. J.; Cunningham, M.; Labov, S. E.

doi:10.1109/77.919474

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…The degradation in resolution in the range between 100 and 200 eV arises from the fact that the top Nb film is partially transparent in this energy region. Photons are thus absorbed both in the Nb absorber and the Al trap underneath where the gap is smaller, and the difference in signal amplitude leads to a broadening of the observed line [13].…”

Section: Detector Performancementioning

confidence: 99%

A multichannel superconducting tunnel junction detector for high-resolution X-ray spectroscopy of magnesium diboride films

Friedrich

Vailionis

Drury

et al. 2003

IEEE Trans. Appl. Supercond.

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We have built a high-resolution soft x-ray spectrometer using a 3 3 array of superconducting Nb-Al-AlOx-Al-Nb tunnel junctions. The detector is cooled to 0.1 K by a two-stage adiabatic demagnetization refrigerator while being held at the end of a 40-cm-long detector snout that can be inserted into an experimental chamber. The 0.6 mm 0.6 mm array has an energy resolution of 10-15 eV FWHM for x-ray energies below 1 keV and total count rate capabilities above 100 000 counts/s. We demonstrate the capabilities of the instrument in a study of anisotropy in-axis oriented MgB films by near edge x-ray absorption spectroscopy. The absorption fine structure at the B K-edge differs for excitation with x-rays polarized along the-axis and in the-plane of the MgB film. We discuss the implications of the anisotropy for the density of states in MgB at the Fermi surface.

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Section: Detector Performancementioning

confidence: 99%

A multichannel superconducting tunnel junction detector for high-resolution X-ray spectroscopy of magnesium diboride films

Friedrich

Vailionis

Drury

et al. 2003

IEEE Trans. Appl. Supercond.

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“…S INGLE-PHOTON spectrometers based on superconducting tunnel junctions (STJs) have been successfully used in astronomy in the optical range, and in the EUV through soft x-ray region for synchrotron studies [1]. These applications and biological microscopy applications would benefit if the STJ based photon detectors could achieve larger count rates, and were produced in larger arrays with multiplexable low-temperature readouts.…”

Section: Introductionmentioning

confidence: 99%

Diffusion-Engineered Quasiparticle Multiplication for STJ Single Photon Detectors

Savu

Wilson²,

Frunzio³

et al. 2005

IEEE Trans. Appl. Supercond.

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Abstract-We have designed a diffusion-engineered, singlephoton spectrometer in the optical-UV range using a superconducting tunnel junction. The optical photon is absorbed in a Ta film and creates excess quasiparticles. These trap into an Al tunnel junction. Internal charge multiplication is achieved with backtunneling, which occurs when the residence time of the quasiparticles near the junction is longer than the tunneling time. The collected charge is a multiple of the initially created charge. We implement backtunneling by geometrically constricting the outflow of quasiparticles, with a narrow lead. The outdiffusion time is set by the geometry of the narrow lead. Our geometry optimizes the energy resolution and count rate, while reducing the heating and noise seen with much longer confinement time. Long confinement times produce excess heating and noise, as we observed previously with quasiparticle confinement achieved via bandgap engineering.

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The spectral response of superconducting tunnel junction X-ray detectors

Friedrich

Fliegauf

Frank

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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Line-splitting in high-resolution superconducting tunnel junction EUV detectors

Abstract: This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author.

Cited by 4 publications

References 17 publications

A multichannel superconducting tunnel junction detector for high-resolution X-ray spectroscopy of magnesium diboride films

A multichannel superconducting tunnel junction detector for high-resolution X-ray spectroscopy of magnesium diboride films

Diffusion-Engineered Quasiparticle Multiplication for STJ Single Photon Detectors

The spectral response of superconducting tunnel junction X-ray detectors

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