Wave propagation of induced radiation in microcapillary holes of a glass microchannel plate

Mazuritskiy, M. I.; Dabagov, S.B.; Marcelli, A.; Лерер, А. М.; Novakovich, A. A.; Dziedzic-Kocurek, Katarzyna

doi:10.1364/josab.31.002182

Cited by 19 publications

(9 citation statements)

References 26 publications

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“…At present, experimental investigations of X-ray transmission through microcapillary structures, aimed at the R&D of dedicated optics working in the 'water window' spectral region, are limited. Previous studies (Mazuritskiy, 2006(Mazuritskiy, , 2012Mazuritskiy et al, 2013aMazuritskiy et al, ,b, 2014Mazuritskiy et al, , 2015 were devoted to the characterization of the propagation of radiation hitting the walls inside the hollow channel of a MCP, and how the excited fluorescence radiation can be transported by MCP polycapillary structures. In the following sections we will show and discuss synchrotron radiation spectral data and the angular distribution of the intensity collected at the exit of MCPs.…”

Section: Introductionmentioning

confidence: 99%

Excitation and propagation of X-ray fluorescence through thin devices with hollowed ordered structures: comparison of experimental and theoretical spectra

Mazuritskiy

Dabagov

Marcelli

et al. 2016

J Synchrotron Radiat

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The lack of models describing the propagation of X-rays in waveguides and the interference mechanism between incident and reflected radiation waves hamper the understanding and the control of wave propagation phenomena occurring in many real systems. Here, experimental spectra collected at the exit of microchannel plates (MCPs) under the total X-ray reflection condition are presented. The results are discussed in the framework of a theoretical model in which the wave propagation is enhanced by the presence of a transition layer at the surface. The angular distributions of the propagating radiation at the exit of these MCPs with microchannels of ∼3 µm diameter will also be presented and discussed. These spectra show contributions associated with the reflection of the primary monochromatic beam and with the fluorescence radiation originating from the excitation of atoms composing the surface of the microchannel. The soft X-ray fluorescence spectra collected at the exit of microcapillaries were analyzed in the framework of a wave approximation while diffraction contributions observed at the exit of these hollow X-ray waveguides have been calculated using the Fraunhofer diffraction model for waves in the far-field domain. Data collected at the Si L-edge show that in glassy MCPs the fluorescence radiation can be detected only when the energy of the primary monochromatic radiation is above the absorption edge for grazing angles higher than half of the critical angle of the total reflection phenomenon. Experimental data and simulations of the propagating radiation represent a clear experimental confirmation of the channeling phenomenon of the excited fluorescence radiation inside a medium and point out that a high transmission can be obtained in waveguide optics for parameters relevant to X-ray imaging.

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Section: Introductionmentioning

confidence: 99%

Excitation and propagation of X-ray fluorescence through thin devices with hollowed ordered structures: comparison of experimental and theoretical spectra

Mazuritskiy

Dabagov

Marcelli

et al. 2016

J Synchrotron Radiat

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“…In this case, other spectral peaks were not revealed. The dependences between the intensity and the energy of the quanta of incident radiation were obtained at fixed photodiode positions corresponding to the peaks A and A', for which the fine structure of spectra (dependence of the intensity on the energy) agreed fully with the experimental [22] and theoretically calculated [27] structures of the spectra of X-rays reflected from flat crystals and MCPs. Thus, the coincidence between the fine structures of the spectra is additional evidence that, in their nature, the spectral peaks A and A' correspond to reflected radiation recorded by the detector at the MCP output.…”

Section: Mazuritskiy Lerermentioning

confidence: 54%

“…It was established [17][18][19] that fluorescence excited in the interior can propagate along hollow microcapillaries, corresponding to the directed transportation of X-rays. In [20][21][22], the fluorescence-induced surface channeling effect was investigated and the angular dependences and fine structure of the X-ray spectra were obtained at the MCP output. In this work, the angular and spectral distributions of synchrotron radiation passed through MCP microcapillaries are studied in the anomalous dispersion region corresponding to the electron-transition excitation energy in the vicinity of the SiL 2, 3 and OK absorption edges.…”

Section: Introductionmentioning

confidence: 99%

Resonant excitation and spatial distribution of fluorescent X-rays at the output of polycapillary structures

Mazuritskiy

Лерер

2016

J. Synch. Investig.

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Experimental and theoretical studies of the angular X-ray-intensity distribution are performed at the output of microchannel plates under the condition that monochromatic radiation is incident on the microcapillary walls at grazing angles. The primary-radiation angles and energies at which a synchrotronradiation beam excites fluorescent X-rays propagating through polycapillary structures are determined. In the case of X-rays passing through microcapillaries, the fine structure of their spectra is investigated at energies corresponding to the anomalous dispersion region of the SiL 2, 3 and OK absorption edges. Theoretical calculations are carried out using a model involving a transition layer on the microchannel surface.

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“…By changing the incidence angle of the radiation and the length-to-width ratio of the channels, MCPs can also be used to filter the transmitted radiation (Cao et al, 2013). Finally, experimental and theoretical efforts are in progress to exploit the use of MCPs for fluorescence applications (Mazuritskiy, 2012;Mazuritskiy et al, 2014) and as diffractive devices (Mazuritskiy et al, 2016a(Mazuritskiy et al, ,b, 2018 in combination with different layouts and X-ray sources.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation and focusing of soft X-rays by spherical bent microchannel plates

Mazuritskiy¹,

Лерер²,

Marcelli³

et al. 2021

J Synchrotron Rad

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Synchrotron radiation sources have been used to study the focusing properties and angular distribution of X-ray radiation at the exit of spherically bent microchannel plates (MCPs). In this contribution it is shown how soft X-ray radiation at energies up to 1.5 keV can be focused by spherically bent MCPs with curvature radii R of 30 mm and 50 mm. For these devices, a focus spot is detectable at a distance between the detector and the MCP of less than R/2, with a maximum focusing efficiency up to 23% of the flux illuminating the MCP. The soft X-ray radiation collected at the exit of microchannels of spherically bent MCPs are analyzed in the framework of a wave approximation. A theoretical model for the wave propagation of radiation through MCPs has been successfully introduced to explain the experimental results. Experimental data and simulations of propagating radiation represent a clear confirmation of the wave channeling phenomenon for the radiation in spherically bent MCPs.

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Wave propagation of induced radiation in microcapillary holes of a glass microchannel plate

Cited by 19 publications

References 26 publications

Excitation and propagation of X-ray fluorescence through thin devices with hollowed ordered structures: comparison of experimental and theoretical spectra

Excitation and propagation of X-ray fluorescence through thin devices with hollowed ordered structures: comparison of experimental and theoretical spectra

Resonant excitation and spatial distribution of fluorescent X-rays at the output of polycapillary structures

Wave propagation and focusing of soft X-rays by spherical bent microchannel plates

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