Observation of soft X-ray Cherenkov radiation in Be and Si foils

Uglov, S. R.; Vukolov, A. V.

doi:10.1088/1748-0221/16/07/p07043

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…The measured spectral line width is an experimental evidence of the separately observed PXR and DTR contributions, since the width of the PXR spectral line should be several times narrower than that of the DTR (figures 4 and 5). The DTR and PXR spectra can be studied using another multilayer structure as a spectrometer [13][14][15][16]. The width of the spectral line can be found experimentally by measuring the width of the rocking curve -the dependence of the radiation output on the tilt angle of the multilayer structure.…”

Section: On the Experimental Observation Of The Fine Structure Of The...mentioning

confidence: 99%

Spectrum of coherent VUV radiation generated by 5.7 MeV electrons in a multilayer X-ray mirror

Shevelev,

Uglov,

Vukolov

2024

J. Inst.

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The spectral and angular properties of diffracted transition radiation (DTR) and parametric radiation (PXR) in the ultrasoft X-ray region generated by the periodic structure upon interaction with a relativistic electron beam with energy of 5.7 MeV are numerically studied using a sample of the periodic structure [Mo/Si]50, known as a multilayer X-ray mirror. Based on calculations, an experimental approach is proposed to separate and identify the contributions of PXR and DTR. The ultrasoft X-ray radiation can be used to eliminate coherent effects occurring in the optical range when diagnosing the submicron electron beam size.

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Section: On the Experimental Observation Of The Fine Structure Of The...mentioning

confidence: 99%

Spectrum of coherent VUV radiation generated by 5.7 MeV electrons in a multilayer X-ray mirror

Shevelev,

Uglov,

Vukolov

2024

J. Inst.

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“…In the soft X-ray spectral range, ChR was certainly detected for target materials such as vanadium, titanium, beryllium, aluminum, and silicon [3,4,19,20], while for other materials, more detailed experimental studies are required. Therefore, in this study, we selected one of these materials to calculate the characteristics of hybrid radiation.…”

Section: Complex Permittivity Of Medium In the Water Window Spectral ...mentioning

confidence: 99%

Spectral Characteristics of Polarization Radiation in the Water Window Range

Shevelev,

Konkov,

Uglov

et al. 2024

QuBS

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The high-intensity and monochromatic radiation sources in the water window spectral range are desirable for many applications. One of the potential candidates of soft X-ray sources is polarization radiation produced by a charged particle passing through a thin foil. In the soft X-ray range near the absorption edges of a target material, the real part of dielectric permittivity can exceed unity, and the Tamm–Frank criterion is fulfilled. Thus, two types of radiation are produced: transition and Cherenkov radiation. In this report, we theoretically investigated the spectral characteristics of radiation produced in both cases when the Tamm–Frank criterion is met or not met. We showed the dependences of the spectrum as a function of thickness and the incidence angle. To describe the properties of polarization radiation and the complex dielectric permittivity, the polarization current approach and Henke’s model were used, respectively.

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Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation

et al. 2023

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The science and technology of X-ray optics have come far, enabling the focusing of X-rays for applications in high-resolution X-ray spectroscopy, imaging, and irradiation. In spite of this, many forms of tailoring waves that had substantial impact on applications in the optical regime have remained out of reach in the X-ray regime. This disparity fundamentally arises from the tendency of refractive indices of all materials to approach unity at high frequencies, making X-ray-optical components such as lenses and mirrors much harder to create and often less efficient. Here, we propose a new concept for X-ray focusing based on inducing a curved wavefront into the X-ray generation process, resulting in the intrinsic focusing of X-ray waves. This concept can be seen as effectively integrating the optics to be part of the emission mechanism, thus bypassing the efficiency limits imposed by X-ray optical components, enabling the creation of nanobeams with nanoscale focal spot sizes and micrometer-scale focal lengths. Specifically, we implement this concept by designing aperiodic vdW heterostructures that shape X-rays when driven by free electrons. The parameters of the focused hotspot, such as lateral size and focal depth, are tunable as a function of an interlayer spacing chirp and electron energy. Looking forward, ongoing advances in the creation of many-layer vdW heterostructures open unprecedented horizons of focusing and arbitrary shaping of X-ray nanobeams.

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Observation of soft X-ray Cherenkov radiation in Be and Si foils

Cited by 3 publications

References 27 publications

Spectrum of coherent VUV radiation generated by 5.7 MeV electrons in a multilayer X-ray mirror

Spectrum of coherent VUV radiation generated by 5.7 MeV electrons in a multilayer X-ray mirror

Spectral Characteristics of Polarization Radiation in the Water Window Range

Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation

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