X-ray emission by a high-energy electron with a nonequilibrium field in an ultrathin crystal

Trofymenko, S. V.

doi:10.1103/physreva.98.023813

Cited by 6 publications

(4 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years the analogous effects were confirmed to exist for the millimeter wavelength diffraction radiation [19]. In [20,21] the modification of the coherent x-ray emission by a high-energy electron in an ultrathin crystal in the result of the particle preliminary penetration through a thick amorphous target was investigated. Here the discussed emission consisted of a strongly interfering (due to small crystal thickness) sum of DTR and PXR which could not be separated from each other.…”

Section: Introductionmentioning

confidence: 78%

See 1 more Smart Citation

Diffracted x-ray transition radiation by a “half-bare” electron

Trofymenko

Шульга

Shchagin

2019

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

The process of diffracted x-ray transition radiation by a high-energy "half-bare" electron in a crystalline target is considered in Bragg geometry. The electron is supposed to appear in the mentioned state, in which the field around it is significantly suppressed comparing to the equilibrium Coulomb one, in the result of preliminary penetration through an upstream amorphous target situated on some distance from the crystal. It is shown that the process of the electron's field regeneration after its exit from the upstream target dramatically modifies both the diffracted transition radiation angular distribution and its total yield making them dependent on the distance between the targets. Analytical expressions for these quantities, as well as their simple approximations, are derived. Almost arbitrary crystal orientation is considered. Special attention is drawn to the case of backward radiation geometry when the emitted radiation has to penetrate through the upstream target on its way to the detector.

show abstract

Section: Introductionmentioning

confidence: 78%

“…By ω p we will denote such frequency of the crystal. In this case the field between the targets reads [6,20]:…”

Section: Electron's Field Evolutionmentioning

confidence: 99%

Diffracted x-ray transition radiation by a “half-bare” electron

Trofymenko

Шульга

Shchagin

2019

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

show abstract

“…In sufficiently thin crystals these contributions are inseparable and interfere with each other. In an isolated crystal, which thickness is smaller than both the x-ray extinction length l ext and TR formation length l f inside it, the radiation spectral-angular distribution d 2 N coh /dωdo resembles that of PXR without the account of medium polarization influence on it [40,41]. If the crystal thickness is not much smaller than l ext the emission can be considered as approximately monochromatic for the fixed observation direction (like in thicker crystals) and d 2 N coh /dωdo can be easily integrated with respect to frequency to obtain:…”

Section: B Coherent X-ray Emission Ultrathin Foilsmentioning

confidence: 99%

K-shell ionization and characteristic x-ray radiation by high-energy electrons in multifoil targets

Trofymenko

2020

Preprint

Self Cite

View full text Add to dashboard Cite

Processes of K-shell ionization and accompanying characteristic x-ray radiation (CXR) by highenergy electrons moving through a multifoil copper target are considered. Expressions describing the main characteristics of these processes are derived. It is shown that the average K-shell ionization cross section in the target is not defined just by the target material and the electron energy, but also depends on the number of foils in the target, their thickness and separation between them. The corresponding CXR yield is therefore not unambiguously defined by the aggregated target thickness, but depends on the above parameters as well. It is demonstrated that the average K-shell ionization cross section in a multifoil target can be several times larger than the conventional cross section of this process without the density effect impact. This results in a considerable enhancement of CXR yield from the multifoil target compared to the case of electron incidence upon a single foil of the same aggregated thickness. Comparison of CXR yield in the considered case with the yields of some other types of x-ray emission in multifoil targets is made.

show abstract

“…A significant suppression of the radiation spectral-angular density, compared to the case of the upstream target absence (when TR is generated by the impinging electron having the conventional unsuppressed Coulomb field), has been observed in this experiment. The analogous effects of radiation suppression due to the "half-bare" state of electrons within the formation region have been studied both theoretically and experimentally for bremsstrahlung [5][6][7][8][9][10], diffraction radiation [11], as well as (only theoretically) for the coherent x-ray emission in crystals [12][13].…”

Section: Introductionmentioning

confidence: 99%

Formation region effects in x-ray transition radiation from 1 to 6 GeV electrons in multilayer targets

Trofymenko

Nazhmudinov

Shchagin

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

The formation region effects in x-ray transition radiation have been experimentally investigated. The radiation was generated using 1-6 GeV electrons impinging on two multilayer targets with considerably different periods. The absolute yield of transition radiation was measured and the wide spectral peak in the range from 10 to 30 keV was observed. In the most part of the electron energy range the emission from the short-period radiator was expectedly suppressed, compared to the case of the long-period one. But for the electron energy of 1 GeV an opposite effect, though rather small, of the emission enhancement in the short-period radiator was observed. The conditions, under which this effect is much stronger, are derived and its possible practical value is outlined. The theory accounting for an arbitrary transversal shape of the electron beam and the finite size of the detector is developed. This theory describes rather well the experimental results.

show abstract

X-ray emission by a high-energy electron with a nonequilibrium field in an ultrathin crystal

Cited by 6 publications

References 40 publications

Diffracted x-ray transition radiation by a “half-bare” electron

Diffracted x-ray transition radiation by a “half-bare” electron

K-shell ionization and characteristic x-ray radiation by high-energy electrons in multifoil targets

Formation region effects in x-ray transition radiation from 1 to 6 GeV electrons in multilayer targets

Contact Info

Product

Resources

About