Quasiparticle recombination in STJ X-rays detectors

Andrianov, V. A.; Filippenko, L. V.; Gorkov, V. P.; Koshelets, V. P.

doi:10.1016/j.nima.2005.12.102

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The samples of STJ-detectors Si-substrate/Ti/Nb/Al,AlO x /Al/Nb (2) The pulse height spectra were measured at different bias voltages V d at the temperature 1.25 K. The samples were irradiated by MnK α and MnK β X-rays (5.9 and 6.4 keV) from a 55 Fe radioactive source, by fluorescent TiK α and TiK β X-rays (4.5 and 4.9 keV) from a Ti foil shield placed around the source and with fluorescent SiK α X-rays from Si substrate [5].…”

Section: Experiments and Discussionmentioning

confidence: 99%

“…The data are considered in a framework of diffusion model of STJ-detectors. There are two main mechanisms of line broadening: the quasiparticle self-recombination [4,5] and the edge losses of the excess quasiparticles [2]. The self-recombination causes the nonlinearity of the detector response versus the energy of the absorbed phonon as well.…”

Section: The Diffusion Model Of Stj-detectorsmentioning

confidence: 99%

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Energy Resolution of STJ X-Ray Detectors with Killed Electrode. Simple Model

Andrianov

Filippenko

2012

J Low Temp Phys

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Superconducting tunnel junctions X-ray detectors Ti/Nb/Al,AlO x /Al/ Nb(2)/NbN with killed Ti/Nb electrode was studied as a function of bias voltage, energy of the absorbed quantum, and thickness of the Nb(2) layer. The data was compared with a simple diffusion model including the losses of excess quasiparticles due to self-recombination. It was shown that increasing of the electrode thickness reduces the self-recombination contribution and improves the linearity of the detector response.

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Section: Experiments and Discussionmentioning

confidence: 99%

Section: The Diffusion Model Of Stj-detectorsmentioning

confidence: 99%

Energy Resolution of STJ X-Ray Detectors with Killed Electrode. Simple Model

Andrianov

Filippenko

2012

J Low Temp Phys

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“…An alternative STJ detector design uses a low-gap film to suppress ("kill") the X-ray response of the STJ base electrode [3,4]. We have implemented this design by depositing a low-gap Ti trapping layer (T c ≈ 0.06 K) below the Nb/Al base electrode to ensure quick capture of the excess quasiparticles created by X-ray absorption in the base Nb film.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, we have deposited a NbN reflection layer on top of the Nb/Al absorber electrode to prevent Nb oxidation and the associated quasiparticle loss at the STJ surface. This detector type not only removes the line splitting artifact, but also speeds up the signal response to ~0.2 µs [4].…”

Section: Introductionmentioning

confidence: 99%