The Experts below are selected from a list of 11919 Experts worldwide ranked by ideXlab platform
A Mazzolari - One of the best experts on this subject based on the ideXlab platform.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
European Physical Journal C, 2017Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that there is a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
arXiv: Accelerator Physics, 2016Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that it exists a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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investigation of the electromagnetic radiation emitted by sub gev electrons in a bent crystal
Physical Review Letters, 2015Co-Authors: L Bandiera, V Guidi, A Mazzolari, E Bagli, G Germogli, H Backe, W Lauth, A Berra, D Lietti, M PrestAbstract:The radiation emitted by 855 MeV electrons via planar channeling and volume reflection in a $30.5\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$-thick bent Si crystal has been investigated at the MAMI (Mainzer Mikrotron) accelerator. The spectral intensity was much more intense than for an equivalent amorphous material, and peaked in the MeV range in the case of channeling radiation. Differently from a straight crystal, also for an incidence angle larger than the Lindhard angle, the spectral intensity remains nearly as high as for channeling. This is due to volume reflection, for which the intensity remains high at a large incidence angle over the whole angular acceptance, which is equal to the bending angle of the crystal. Monte Carlo simulations demonstrated that Incoherent Scattering significantly influences both the radiation spectrum and intensity, either for channeling or volume reflection. In the latter case, it has been shown that Incoherent Scattering increases the radiation intensity due to the contribution of volume-captured particles. As a consequence, the experimental spectrum becomes a mixture of channeling and pure volume reflection radiations. These results allow a better understanding of the radiation emitted by electrons subjected to coherent interactions in bent crystals within a still-unexplored energy range, which is relevant for possible applications for innovative and compact x-ray or $\ensuremath{\gamma}$-ray sources.
L Bandiera - One of the best experts on this subject based on the ideXlab platform.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
European Physical Journal C, 2017Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that there is a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
arXiv: Accelerator Physics, 2016Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that it exists a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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investigation of the electromagnetic radiation emitted by sub gev electrons in a bent crystal
Physical Review Letters, 2015Co-Authors: L Bandiera, V Guidi, A Mazzolari, E Bagli, G Germogli, H Backe, W Lauth, A Berra, D Lietti, M PrestAbstract:The radiation emitted by 855 MeV electrons via planar channeling and volume reflection in a $30.5\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$-thick bent Si crystal has been investigated at the MAMI (Mainzer Mikrotron) accelerator. The spectral intensity was much more intense than for an equivalent amorphous material, and peaked in the MeV range in the case of channeling radiation. Differently from a straight crystal, also for an incidence angle larger than the Lindhard angle, the spectral intensity remains nearly as high as for channeling. This is due to volume reflection, for which the intensity remains high at a large incidence angle over the whole angular acceptance, which is equal to the bending angle of the crystal. Monte Carlo simulations demonstrated that Incoherent Scattering significantly influences both the radiation spectrum and intensity, either for channeling or volume reflection. In the latter case, it has been shown that Incoherent Scattering increases the radiation intensity due to the contribution of volume-captured particles. As a consequence, the experimental spectrum becomes a mixture of channeling and pure volume reflection radiations. These results allow a better understanding of the radiation emitted by electrons subjected to coherent interactions in bent crystals within a still-unexplored energy range, which is relevant for possible applications for innovative and compact x-ray or $\ensuremath{\gamma}$-ray sources.
V Guidi - One of the best experts on this subject based on the ideXlab platform.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
European Physical Journal C, 2017Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that there is a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
arXiv: Accelerator Physics, 2016Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that it exists a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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investigation of the electromagnetic radiation emitted by sub gev electrons in a bent crystal
Physical Review Letters, 2015Co-Authors: L Bandiera, V Guidi, A Mazzolari, E Bagli, G Germogli, H Backe, W Lauth, A Berra, D Lietti, M PrestAbstract:The radiation emitted by 855 MeV electrons via planar channeling and volume reflection in a $30.5\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$-thick bent Si crystal has been investigated at the MAMI (Mainzer Mikrotron) accelerator. The spectral intensity was much more intense than for an equivalent amorphous material, and peaked in the MeV range in the case of channeling radiation. Differently from a straight crystal, also for an incidence angle larger than the Lindhard angle, the spectral intensity remains nearly as high as for channeling. This is due to volume reflection, for which the intensity remains high at a large incidence angle over the whole angular acceptance, which is equal to the bending angle of the crystal. Monte Carlo simulations demonstrated that Incoherent Scattering significantly influences both the radiation spectrum and intensity, either for channeling or volume reflection. In the latter case, it has been shown that Incoherent Scattering increases the radiation intensity due to the contribution of volume-captured particles. As a consequence, the experimental spectrum becomes a mixture of channeling and pure volume reflection radiations. These results allow a better understanding of the radiation emitted by electrons subjected to coherent interactions in bent crystals within a still-unexplored energy range, which is relevant for possible applications for innovative and compact x-ray or $\ensuremath{\gamma}$-ray sources.
I V Kirillin - One of the best experts on this subject based on the ideXlab platform.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
European Physical Journal C, 2017Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that there is a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
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influence of Incoherent Scattering on stochastic deflection of high energy negative particle beams in bent crystals
arXiv: Accelerator Physics, 2016Co-Authors: I V Kirillin, N F Shulga, L Bandiera, V Guidi, A MazzolariAbstract:An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that it exists a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of Incoherent Scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.
Z L Wang - One of the best experts on this subject based on the ideXlab platform.
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Scattering of an electromagnetic wave from a slightly random dielectric surface yoneda peak and brewster angle in Incoherent Scattering
Waves in Random Media, 1997Co-Authors: Tetsuya Kawanishi, Hisanao Ogura, Z L WangAbstract:Abstract The Scattering of an electromagnetic wave from a two-dimensional, slightly rough dielectric surface is studied based on the stochastic functional approach. It is shown that in the case of TM(p)-polarized incidence there exists a zero in the Incoherent Scattering at the angle we call the ‘Brewster Scattering angle’, which depends on the incident angle in contrast to the Brewster angle of coherent reflection which is independent of the incident angle, that a ‘quasi-anomalous Scattering’ can generally occur in the optically denser medium at the critical angle of total reflection in both TE(s)- and TM(p)-polarized incidence, regardless of which side of the random surface is illuminated, and that the Yoneda peak in the x-ray Scattering can be interpreted as a special case of the quasi-anomalous Scattering which becomes sharper when the relative refractive index becomes closer to unity as in the x-ray region. Cross-polarized Scattering and enhanced backScattering due to the second-order effect are also...
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surface plasmon mode on a random rough metal surface enhanced backScattering and localization
Physical Review B, 1996Co-Authors: H Ogura, Z L WangAbstract:The Scattering of light by a silver film with a random rough surface and the excitation of surface-plasmon modes at the metal surface are studied by means of the stochastic functional approach, assuming that the random surface is a homogeneous Gaussian random field. The stochastic wave fields are represented in terms of the Wiener-Hermite orthogonal functionals, and the approximate solutions are obtained for the Wiener kernels. For the attenuated total reflection configuration considered in the paper, the angular distributions of Incoherent Scattering into both crystal and air are numerically calculated by using first- and second-order Wiener kernels for various combinations of the parameters. In the angular distributions of Incoherent Scattering into crystal, strong peaks can be observed corresponding to the excitation of forward- and backward-traveling plasmon modes, which are mainly described by the first-order Wiener kernel, and an enhanced Scattering peak appears in the backward direction. In the angular distributions of Incoherent Scattering into air, an enhanced Scattering peak also appears in a certain direction, related to the incident angle on the crystal side. The random wave fields at the resonant Scattering on the surface of a random rough grating are also numerically calculated from the higher Wiener kernels with an iterative procedure. Localized modes can be clearly observed in the spatial distribution of the random wave fields. The enhanced Scattering comes from the second-order Wiener kernel that describes the ``double-Scattering'' processes of the ``dressed'' plasmon modes, and is due to the interference of the two double-Scattering processes in the reciprocal directions, where the strongly excited plasmon modes take part in the intermediate Scattering processes, while the wave localization is a result of ``multiple'' Scattering of strongly excited dressed plasmon waves traveling in the ``random media'' created by the surface roughness. \textcopyright{} 1996 The American Physical Society.
