Coordinatori
PS: Poster Session
- Andrea Liedl (LNF)
Descrizione
Session PS2
Dr.
Sergey Uglov
(Tomsk Polytechnic University)
07/10/14, 17:00
Poster
The dynamics of changing the form of angular distribution and intensity of EUV radiation emitted from a multilayer Mo/Si mirror with changing the angle of grazing incidence o of 5.7 MeV electrons on the mirror surface has been investigated. Two series of angular distributions of radiation have been measured in the region of detection angle 60o< D <160o with and without use a 1 μm Al...
Sig.
Alexandr Savchenko
(Yurevich), Dr.
Alexey Tishchenko
(National Research Nuclear University "MEPhI")
07/10/14, 17:00
Poster
National Research Nuclear University MEPhI, Moscow, Russia
Parametric X-ray radiation (PXR) occurring when charged particles move in a crystal
was predicted theoretically by M.L. Ter-Mikaelyan in 1972 [1], and then observed
experimentally at the Tomsk Synchrotron Sirius in 1985 [2]. Since then PXR has been
studied very well, both theoretically and experimentally (see, for...
Sig.
Alexsandr Ponomarenko
(Russia)
07/10/14, 17:00
Poster
Diffraction radiation (DR) occurs when a charged particle moves near the target. Smith-Purcell effect in DR, or Smith-Purcell radiation (SPR), is caused by periodicity of the target. Both DR and Smith-Purcell radiation have a lot in common with the widely known Cherenkov radiation (CR): all these types of radiation arise due to the polarization of the target material by the Coulomb field of...
Sig.na
Elena Fiks
(National Research Tomsk Polytechnic University)
07/10/14, 17:00
Poster
When the relativistic heavy ions (RHI) penetrate through the thin solid amorphous target (plate) with a constant velocity, two types of electromagnetic radiation may appear: Cherenkov radiation (ChR) (optically transparent plate) and transition radiation (TR) – in optical and/or in X-Ray regions. The RHI bremsstrahlung is strongly suppressed (compared to relativistic electrons) due to large...
Prof.
Karo Ispirian
(A. Alikhanyan National Laboratory (Yerevan Physics Institute), Brothers Alikhanian 2, Yerevan,), Dr.
Victor Yaralov
(A. Alikhanyan National Laboratory (Yerevan Physics Institute), Brothers Alikhanian 2, Yerevan,)
07/10/14, 17:00
Poster
Though the influence of the laser field on channeling radiation (ChR) of electrons with energies up to ~100 MeV has been studied quantum mechanically in many works [1-7], nevertheless, up to now there are no experimental results on such effect. With the purpose to accelerate the necessary experiments and developing the results of [8-10] carried out with the help of the methods [11] for...
Dr.
Gennady Naumenko
(Tomsk Polytechnic University), Sig.na
Veronika Soboleva
(National Research Tomsk Polytechnic University)
07/10/14, 17:00
Poster
The interaction of relativistic electron field with periodic wire structure was considered theoretically in [1] for semi-infinite wire structure. We present in this work the experimental investigation of the interaction of relativistic electron field with periodic wire structure. The used target represented the right triangular prism. The measurements were done in millimeter wavelength region...
Dr.
Anna Kotanjyan
(Yerevan State University)
07/10/14, 17:00
Poster
We investigate the radiation intensity for a charged particle moving along a helical trajectory with an arbitrary cross section around a dielectric cylinder immersed into a homogeneous medium. The corresponding formulae generalize our previous results for the special case of a coaxial circular orbit. For the latter geometry, under certain conditions for the charge velocity and dielectric...
Sig.
Alexsandr Ponomarenko
(Russia)
07/10/14, 17:00
Poster
The nature of polarization radiation is the dynamic polarization of the material by the Coulomb field of passing particles [1]. Depending on the conditions the different types of polarization radiation can occur: Cherenkov radiation (CR), transition radiation, diffraction radiation, Smith-Purcell radiation (SPR) and so on. Sometimes simultaneously two or more mechanisms can take place and then...
Dr.
Pavel Karataev
(Royal Holloway, Unviersity of London)
07/10/14, 17:00
Poster
Optical Transition Radiation appearing when a charged particle crosses a boundary between two media with different dielectric properties has widely been used for transverse beam size, energy spread, position, and emittance diagnostics. Recent developments have demonstrated an ability to achieve sub-micrometre resolution for transverse beam size measurements [1]. However, a high power beam...
Dr.
Hrant Khachatryan
(Institute of Applied Problems in Physics, 25 Hr. Nersessian Str., 0014 Yerevan, Armenia)
07/10/14, 17:00
Poster
Some characteristic features in the electromagnetic field of a charged particle uniformly revolving along an equatorial orbit around a metallic ball has been studied. The obtained numerical results are based on the corresponding exact solutions of the Maxwell equations. They have been derived in [1,2] by means of the Green functions method, and earlier in [3] for special cases when the...
Sig.
Koryun Gevorgyan
(Yerevan State University (student))
07/10/14, 17:00
Poster
The problem of the radiation of channeled positron beam in a system nanotubes is solved. The polarization of the medium imposes a ban on the value of the beam energy for the formation of radiation. The energy threshold increases with increasing amplitude of the oscillations of positrons. The case is considered whenthe beam energy coincides with the threshold energy for the maximum amplitude...
Prof.
Lekdar Gevorgian
(A. Alikhanyan National Labortory (Yerevan Physics Insitute))
07/10/14, 17:00
Poster
We investigate the undulator radiation from relativistic positrons channeled in wiggler nanotub.It is shown that the main contribution to the radiation intensity comes from higher harmonics.The energy range of the total spectrum of the number of emitted photons is wide.Both the number of emitted photons and the radiation angle do not depend on the photon energy.However, the spectral...
Sig.ra
Anahit Shamamian
(A. Alikhanyan National Laboratory (Yerevan Physics Inistute))
07/10/14, 17:00
Poster
The problem of coherent radiation from microbunchedFEL beam passing through the plasma and interacting with laser beat waves (LBW) is considered. The interaction of plasma with LBWgenerates harmonic modulation of longitudinal density with increasing amplitude and also alongitudinal periodic electric field.Therefore, the beam electrons are influenced by the inhomogeneity of the medium and by...
Sig.
Denis Nikitin
(Lomonosov Moscow State University, Faculty of Physics, Russia, 119991, Moscow, GSP-1, 1-2 Leninskiye Gory), Prof.
Vladislav Grishin
(Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University)
07/10/14, 17:00
Poster
PBR is generated as result of the scattering own Coulomb's field of fast electron on matter electrons. This field can be represented as a stream of virtual photons, scattering them on atomic electrons generates PBR. Therefore PBR is very sensitive to electronic configuration that is of obvious interest to PBR as a possible method of diagnostics of the matter structure of. However, the spectrum...
Sig.
Vyacheslav Malyshevsky
(Southern Federal University, 344090, Rostov-on-Don, Russia)
07/10/14, 17:00
Poster
The features of the angular distributions of accelerated neutral atoms at grazing incidence on the surface of Al ( 001) [1,2] are theoretically investigated. Interaction of accelerated atoms with atoms of the crystal lattice, electronic properties and atomic structure of the surface of the Al ( 001) are calculated using the DFT methods. Simulation of angular distributions of scattered atoms...
Prof.
Alexander Lobko
(Institute for Nuclear Problems, Belarus State University)
07/10/14, 17:00
Poster
In the report we will describe fabrication and characterisation of nanodiamond targets for accelerator x-ray experiments.
Prof.
Vladimir Vysotskii
(Kiev National Shevchenko Univ, Kiev, Ukraine)
07/10/14, 17:00
Poster
The problem of creation of effective short-focus X-ray optics is discussed. In our works was investigated the problem of effective multiple transformation of pulse X-ray radiation to acoustic shock waves and acoustic shock waves to X-ray radiation at the interfaces of different media (e.g. air and metal) without phase distortion. In our experiments it was found that the impact of shock...
Sig.
Vasily Sukharev
(National Research Nuclear University MEPhI)
07/10/14, 17:00
Poster
The phenomenon of anomalous reflection of X-rays, i.e. origination of non-mirror peak of angular spectrum of scattered radiation from rough surface near angle of total reflection, was discovered about fifty years ago [1]. The same phenomenon was discovered for thermal and diffusive Compton-scattered gamma-rays as well [2]. Later works demonstrated that when grazing angle is close to angle of...
Giacomo Germogli
(FE)
07/10/14, 17:00
Poster
In the last years, thanks to innovative techniques for crystals design and fabrication, based on silicon micromachining, it was possible to realize bent crystals for beam manipulation through coherent interactions, thin enough to avoid the loss of deflection efficiency caused by dechanneling, while maintaining the crystal structure perfectly intact. The realization of such thin bent crystals...
Sig.
Yury Cherepennikov
(Tomsk Polytechnic University)
07/10/14, 17:00
Poster
Nowadays X-ray absorptiometry is widely used in the X-ray structural analysis [1]. Moreover, this approach can be applied to elemental analysis of substance [2]. Another important applied task in which X-ray absorption approach is used is content control of components in media containing limited number of fractions, e.g. composition control of two- and three-component media that industry needs...
Prof.
Yury Pivovarov
(National Research Tomsk Polytechnic University)
07/10/14, 17:00
Poster
We present the results of calculations of the neutron yield using CR generated by initial electrons with energies 200 - 1600. MeV (SPARC Facility, LNF) focused on Be and D targets. The comparison with other methods of generation of fast neutron beams (with neutron energy up to several MeV) is performed, especially with so called “neutron focus in the field of synchrotron radiation”.
Sig.
Sergei Stuchebrov
(Tomsk Polytechnic University)
07/10/14, 17:00
Poster
Reduce the problem of dose loads on biological objects engaged for several decades, especially in the methods of X-ray computed tomography.
The problem of decreasing of dose rate for the biological objects is highly relevant for a last few decades. This is especially important in X-ray computer tomography methods. There are few approaches to solve this problem. One of the most effective of...
Prof.
Nikolai Shul'ga
(Akhiezer Institute for Theoretical Physics of NSC KIPT)
07/10/14, 17:00
Poster
The scattering of the plane electromagnetic wave on the fiber-like target is considered. The formula for the scattering cross section is used for building the kinetic equation that describes the propagation of the radiation in the rope of parallel fibers. The approach to building the kinetic equation is analogous to one applied in the description of multiple scattering of particles in...
Claudia Polese
(LNF)
07/10/14, 17:00
Poster
Micro-XRF is a powerful instrument for the non-destructive characterization of materials of cultural interest.
At XLab Frascati this technique is already well performed thanks to polyCO set equipment. For instance, micro-XRF 2D mapping have been carried out on different samples, such as painting layers, adobe and pottery.
However, in the cultural heritage field "in situ" analysis are often...
Sig.
Fedor Mikhailov
(Nikolaevich)
07/10/14, 17:00
Poster
We study the mechanical properties of the carbine. Model is an array of long chains of 13 nm, located in the cell with periodic boundaries on the sides. At a temperature of 300K, the model is the longitudinal tension. Results on the change of the interatomic bonds, calculated Young's modulus ≈ 0.15 TPa whose order is consistent with the recently published work [1].
References
1. A.K. Nair,...
Dr.
Vahan Kocharyan
(Institute of Applied Problems of Physics of NAS RA, 0014, Hr. Nersisyan str. 25, Yerevan, Armenia. National Research Tomsk Polytechnic University 634050, Lenin Avenue 30, Tomsk, Russia)
07/10/14, 17:00
Poster
In the works [1] it was first observed that the phenomenon of the full pumping of X-rays from transmitted direction to the reflection direction in single quartz crystals in the Laue geometry under the influence of the temperature gradient or acoustic vibrations. In work [2] it is shown that the angular width of the full pumping radiation is directly proportional to the thickness of the sample....
Dr.
Vardan Margaryan
(Institute of Applied Problems of Physics of NAS RA, 0014, Hr. Nersisyan str. 25, Yerevan, Armenia)
07/10/14, 17:00
Poster
In the works [1,2] it was first observed that the phenomenon of the full pumping of X-rays from transmitted direction to the reflection direction in single quartz crystals in the Laue geometry under the influence of the temperature gradient or acoustic vibrations. In work [3] it was experimentally and theoretically shown that with the help of an acoustic field and temperature gradient it is...
