Konstantin Korotchenko
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
It is shown that electrons channeled along the (220) planes of the crystal C (diamond), the radiation in the energy range (1.5,12.5) eV is the Cerenkov radiation at the channeling - ChRC (ChRС-photons) which should be nonuniform in the azimuthal angular distribution. These features of the angular distribution of the channeling radiation (CR) from channeled relativistic electrons (optical...
Sergei Abdrashitov
(National Research Tomsk Polytechnic University),
Timur Tukhfatullin
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
The total yield of the radiation from ultra-relativistic 150 GeV electrons and positrons was estimated by semiclassical Baier-Katkov method in [1] and for 1 GeV electrons in the framework of classical electrodynamics in [2]. Angle-of-incidence dependence of the total yield of channeling radiation (CR) from 155-855 MeV electrons in Si and W was considered in [3] using developed code [4]. Also...
Prof.
Gennadiy Filippov
(Cheboksary Polytechnic Institute), Ms
Irina Lysova
(Chuvash State Pedagogical University)
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
The problem of the generation of electromagnetic radiation generated by the uniform motion of a charge along the axis of the dielectric tube. The tube has a cylindrical symmetry, area 2 (tube body) is a homogeneous dielectric with known values of the dielectric constants (the longitudinal or vortex). It is assumed that a moving charge does not break the cylindrical symmetry of the system. The...
Prof.
Yury Chesnokov
(IHEP)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
A.A. Kaloyan 1, S.A. Tikhomirov 1, K.M. Podurets 1, Yu.A. Chesnokov 2, Yu.E.Sandomirskiy 2
1 National Research Centre “Kurchatov Institute”, Moscow 123182, Russia
2 Institute for High Energy Physics in National Research Centre “Kurchatov Institute”,
Protvino 142281, Russia
Currently, for the extraction and collimation of the proton beams at the large accelerators, bent silicon single...
Yuri Kunashenko
(Tomsk State Pedagogical University Tomsk Polytechnic University)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
The neutron has a spin and anomalous magnetic moment and, therefore, it can interact with electromagnetic field. Schwinger [1] was the first who predicted that fast neutrons can be scattered by atom electric field due to their magnetic moment. The Schwinger scattering of fast neutrons by the atoms was experimentally proved in 1956 [2].
Another mechanism of neutron interaction with...
Yury Eikhorn
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
The flux-peaking effect (FPE) of channeled particles is one of the known orientation effects at channeling [1].
In this work we investigated the conditions that necessary to observe of FPE at (220) planar channeling of 255 MeV positrons in thin Si crystals. For the FPE description of channeled positrons the numerical calculation of flux dynamics were performed in the frame of quantum and...
Sergei Abdrashitov
(National Research Tomsk Polytechnic University),
Timur Tukhfatullin
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
The radiation from the high energy (up to 10 GeV) electron beam is known to be reasonably effective positron source. An approach being possess high efficiency is to use electron beam for production of channeling radiation (CR) in a crystalline target (radiator) and subsequent electron-positron pair production in amorphous target (convertor), so called a “hybrid” solution [1].
The...
Andrey Oleinik
(NRU BelSU)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
Electrons accelerated in the pyroelectric accelerator hit the surface of the pyroelectric crystal. Results of the experimental research of the distribution of X-rays produced by the electrons on the pyroelectric crystal surface are presented and discussed. The maximum yield X-rays was observed in the center of the crystal.
Yury Cherepennikov
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
The authors propose a brand new technology named dual wave absorptiometry. This technology, which is a special case of X-ray wave dispersive spectroscopy, can be used for determination of component composition of the media containing limited number of components, for example multiphase fluids, that is topical issue for modern oil and gas industry. A detailed description of the proposed...
Prof.
Yuri Pivovarov
(National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia; V.E. Zuev Institute of Atmospheric Optics, SB RAS, 634021Tomsk, Russia)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
As is well known, the channelling radiation (CR) from sub-GeV relativistic electrons is characterized by brilliant peak in intensity at the photon energies within 1-5 MeV. These photons may lead to the photonuclear reaction (gamma, n) in the downstream target consisting of nuclei with appropriate neutron binding energy. Since the CR spectrum and its maximum position depends on the initial...
Dr
Hasmik Manukyan
(Yerevan State University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
The problem is considered of a dynamic reflection of a plane monochromatic X-ray wave at the trapeziform model of superlattice with a stacking fault between layers when absorption is taken into account.
When a plane monochromatic X-ray wave is incident on a superlattice double diffraction occurs, first by atomic planes causing the formation of a modulated X-ray wave in the crystalline medium,...
Ms
Ekaterina Makeeva
(MEPhI)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
Nowadays a strong effort is put into research of nanostructures formation
(shaping/creation) both on the surface and inside solid state specimens. Such an
intention is dictated by a constant drive for interfaces miniaturization in
submicron electronics and allied research areas. Hence, so called mesomaterials,
e.g. cellular materials or capillary structures, are of a great interest....
Sergei Stuchebrov
(Tomsk Polytechnic University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
Electron beams has been widely used in many application fields. Using electron beams generally requires their ability to control characteristics such as beam shape, spectrum and equitability. There are sets of collimators, filters and flutter in industrial plants to settle the issue. However, sometimes there are problems that cannot be solved by means of the existing sets. Besides of that,...
Dr
Victor Yaralov
(A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute))
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
Following the methods developed for atom ionization by alternating electric field
the probability of multi-photon absorption of photons of the strong external laser field by channeled electron (ejection of electron from the channel, photo-ionization) have been calculated for different strengths of the external field and different levels of electrons in a planar channel. The emission spectra...
Elena Fiks
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
The Cherenkov radiation (ChR) from relativistic charged particles moving uniformly and rectilinearly with constant velocity in an optically transparent radiator is described by the well-known Tamm-Frank theory. Several reasons may lead to deviations from this ideal character of motion: 1) multiple scattering – a particle velocity vector changes and angular distribution becomes broadened; 2)...
Sergei Abdrashitov
(National Research Tomsk Polytechnic University),
Timur Tukhfatullin
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
Electromagnetic field is proven [1] to possess an intrinsic angular momentum. Using the developed code BCM-1 [2] the orbital and spin angular momentum of the channeling radiation (CR) from positrons in the thin Si crystal was considered in [3] in the frame of classical approach. The Mathematica [2] code developed by the authors enables calculating the trajectories and CR spectra of both planar...
Dr
Kristina Vokhmyanina
(BelSU)
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
A series of experiments has been conducted to investigate the spectral and angular characteristics of the beam of fast electrons interacting with dielectric surfaces in a grazing mode. The cases of flat, conical and surface-structured targets were considered. The experimental results have shown the ability to control the angular characteristics of the electron beam when changing the...
Mr
I V Fartushev
(Tomsk State Pedagogical University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
Relativistic charged particle passing through a crystal at small incident angle with respect to a crystal plane can be captured into channeling state [1-3]. The channeled particle has the transverse discrete energy levels. Due to the transition from one transverse energy level to another it can emit a photon. In higher-order of the perturbation theory, instead of the photon it can emit an e+e-...
Konstantin Korotchenko
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
The physical reason of predicted phenomena, similar to the band structure of transverse energy levels, is connected with the Bloch form of the wave functions of electrons (positrons) near the crystallographic planes, which appears both in the case of planar channeling of relativistic electrons (positrons) and in reflection by a crystal surface. Calculations show that positions of maxima in...
Dr
Nickolai Maksyuta
(Taras Shevchenko Kiev National University, Faculty of Radio Physics, Electronics and Computer Systems, Kiev, Ukraine)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
In [1] the planar channeling and quasicharacteristic radiation (QCR) in charged planes (111) of ionic crystals LiH, LiD and LiF were studied. In the report the potentials of electron interaction with charged planes (111) and charged axes [110] of LiF crystal, as well as in other crystals of lithium halides (LiCl, LiBr and LiI) are calculated by methodic [2]. It is shown that the contribution...
Gennadiy Filippov
(Cheboksary Polytechnic Institute (branch) of the Moscow State E)
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
It is of a special interest to calculate the radial and longitudinal components of polarization forces for charged particles channeling in tubes (capillaries, pores in the solid films, nanotubes). But dielectrics, as a rule, obey different reaction on the external vortex or potential electromagnetic fields. The polarization properties of homogeneous media described with the help of vortex and...
Vladimir Epp
(Tomsk State Pedagogical University)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
The radiation at grazing incidence of relativistic positively charged particles on the crystal surface in the presence of magnetic field is studied theoretically. The magnetic field is supposed to be parallel to the surface and orthogonal to the velocity of particles. Dependent on the initial conditions the particle can be captured in the channeling mode and perform periodic oscillations near...
Prof.
Vladislav Syshchenko
(Belgorod National Research University, Belgorod, Russian Federation)
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
The fiber-like structures are widely used for control of electromagnetic radiation propagation (waveguides etc., see [1] and references therein). The problem of the wave propagation through the rope of parallel fibers was considered in [2] for the limiting case of small angle of incidence and infinitely thin fiber. The radiation scattering in that case possesses the axial symmetry around the...
Anton Babaev
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
Recently it was shown that charged particles motion in the field of standing electromagnetic wave can undergo the features similar to the particles channeling in crystals [1]. While a charged particle enters the channels formed by electromagnetic standing waves at a small angle to the node (anti-node) planes its motion represents namely the oscillations between two neighboring planes. The...
Dr
Evgeny Sinitsyn
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
The Stark effect causing splitting and mixing of electronic levels in the channeled relativistic heavy ions (RHI) is investigated. For hydrogen-like RHI the linear Stark effect in the electric field of the crystal planes, along with a fine splitting of the electronic levels of channeled RHI, is the main reason of the Resonant Coherent Excitation (RCE) peaks broadening.
...
Anahit Shamamian
(A.Alikhanyan National Laboratory (Yerevan Physics Institute))
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
The self-consistent kinetic equation describing the state of collisionless plasma with an initial distribution of the Maxwell interacting with laser beat waves (LBW) is solved. For study the spectra of transverse electromagnetic waves are received the dispersion equation and expression for the dielectric permittivity. Analysis of the dispersion equation for the slow transverse waves was...
Lekdar Gevorgyan
(Yerevan Phisics Institute)
07/09/2015, 16:30
5. Coherent Bremsstrahlung and Channeling Radiation
Poster
In the crystalline Wiggler (CW) channeled positron oscillates both the higher and less frequently due to the curvature of the planes in the crystal. The parameter of the Wiggler is much greater than unity, the main contribution to the radiation give higher harmonics, the spectra of which overlap.
Radiation is emitted at a small angle in the narrow layer containing the plane of motion of the...
Anton Babaev
07/09/2015, 16:30
7. Processes with Crystalline Targets
Poster
The thin target could be used for beam diagnostics by means the radiation that is induced by interaction of beam particles with target matter [1-3]. The electron beams used in modern applications (as, for example, modern FEL-s) have very large brightness, small emittance as well as very short bunch length. For example, the bunch length of XFEL is about of 25 um at bunch charge 1 nC and with...
Ilya Sheinman
(SPbETU (LETI))
07/09/2015, 16:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
Dielectric lined waveguides are under extensive study as accelerating structures that can be excited by electron beams. Rectangular dielectric structures are used both in proof of principle experiments for new accelerating schemes and for studying the electronic properties of the structure loading material. Some of the materials used for the waveguide loading of accelerating structures (like...
Mr
Ihar Lobach
(Belarusian State University)
08/09/2015, 18:00
3. Parametric X- Radiation
Poster
The parametric X-ray radiation (PXR) by relativistic charged particles in polycrystals was considered in a number of theoretical and experimental investigations during the past two decades. However, in most cases the texture properties of polycrystals was either neglected (uniform distribution of crystallites was assumed) or described semi-qualitatively by preferred orientation and...
Anton Noskov
(Belgorod National Research University)
08/09/2015, 18:00
3. Parametric X- Radiation
Poster
The dynamic theory of coherent X-ray radiation by relativistic electron crossing a three-layer structure consisting of an amorphous substance layer, a layer of vacuum and a layer with artificial periodic structure has been developed. The process of radiation and propagation of X-ray waves in an artificial periodic structure have been considered based on two-wave approximation of dynamic...
Dr
Sergey Uglov
(Tomsk Polytechnic University)
08/09/2015, 18:00
3. Parametric X- Radiation
Poster
Recently, in [1] it was experimentally shown that a Mo/Si multilayer may be used for generation of quasimonochromatic radiation in the range of extreme ultraviolet. This report presents the results of similar experimental study using the multilayer radiator consisted of 100 Cr/Sc bi-layers placed on a 0.5 $\mu$m thick Si3N4 membrane. The multilayer was specially created for generation of the...
Mr
Vitold Bleko
(National Research Tomsk Polytechnic University)
08/09/2015, 18:00
8. Advanced Generation of THz and X-ray beams
Poster
Diffraction and Cherenkov radiation of relativistic electrons from a dielectric target has been proposed as mechanism for production of intense terahertz (THz) radiation in the forward direction. The use of an electron beam of a 4th generation light source appears to be very promising. A moderate power from the electron beam can extracted and converted into THz radiation with nearly 100%...
Ms
Aleksandra Grigoreva
(Saint Petersburg State University)
08/09/2015, 18:00
2. Transition Radiation
Poster
We consider a mode transformation in the circular waveguide with a vacuum part and a part having cylindrical dielectric layer. The problem is analyzed for axially symmetric mode (propagating or evanescent) falling in two cases: a mode falls from the vacuum part and a mode falls from the partially dielectric part.
Analytical investigation is performed by crosslinking method. In the cases of...
Artem Novokshonov
(National Research Tomsk Polytechnic University, Tomsk, Russia)
08/09/2015, 18:00
4. Diffraction Radiation, Smith-Purcell Effect
Poster
Beam loss monitors based on optical fibers are widely used at GeV-scale accelerators [1]. Recently there was proposed to use such a technique for a beam profile diagnostics [2]. We have investigated a feasibility to use the Cherenkov radiation (ChR) generated in a fiber to measure a beam divergence. Measurements were carried out for different angles between a fiber axis and the electron beam...
Ilya Ashanin
(NRNU MEPHI)
08/09/2015, 18:00
8. Advanced Generation of THz and X-ray beams
Poster
As one of the ways THz-radiation can be generated by the relativistic electron bunches travelling through Cherenkov decelerating dielectric filling capillary channel. Sapphire and other dielectric materials for the internal surface coating of the capillary can be used. Relativistic electron bunches having ~100 μm in diameter and pulse durations of 1 ps or shorter are capable to produce...
Tatiana Koskova
(Belgorod National Research University)
08/09/2015, 18:00
3. Parametric X- Radiation
Poster
Coherent X-ray radiation by a beam of relativistic electrons crossing a single-crystal plate in Bragg scattering geometry have been considered. Initial divergence and multiple scattering of electrons on atoms are taking into account in the present work. In the present work, the initial divergence and multiple scattering of electrons on atoms in the target have been taken into account. The...
Daria Sergeeva
(National Research Nuclear University (MEPhI))
08/09/2015, 18:00
3. Parametric X- Radiation
Poster
Motion of charged particles in a crystal is followed by the radiation due to scattering of Coulomb field of the particle on the periodical crystal grating. In X-ray range this radiation called PXR and is well studied both theoretically and experimentally. However, comparative weakness due to absorption of X-rays in target material hampers its practical applications. In article [1] it was...
Prof.
Alexander Potylitsyn
(Tomsk Polytechnic University), Mr
Anatoly Konkov
(Tomsk Polytechnic University)
08/09/2015, 18:00
4. Diffraction Radiation, Smith-Purcell Effect
Poster
It is well-known that the polarization is one of the most important radiation characteristic as well as intensity and spectrum. In this report we use the “polarization currents” approach [1, 2] to calculate the polarization characteristics (the Stokes parameters) of diffraction and Cherenkov radiation occurring as a result of uniform motion of a charge near a finite size dielectric screen. The...
Alexander Shchagin
(Belgorod State University, Belgorod, Russia Kharkov Institute of Physics and Technology, Kharkov, Ukraine)
08/09/2015, 18:00
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Poster
In the charge-exchange accelerators, negatively charged accelerated ions lose their electrons in a charge-exchange target and become positively charged ions. In the present report, radiation arising at charge-exchange of ions a thin transparent charge-exchange target is considered. It is shown that the spectral and angular distribution of the number of quanta emitted by the hydrogen ion that...
Ilya Ashanin
(NRNU MEPHI)
08/09/2015, 18:00
8. Advanced Generation of THz and X-ray beams
Poster
Nowadays interest to the THz-radiation significantly increased in medicine (THz tomographs), in pharmaceutics (definition of medicament's compositions), in introscopy of large-size objects (ships, trains, containers) and others. THz-radiation can be generated by the relativistic electron bunches passing through Cherenkov decelerating capillary channel (circular waveguide with dielectric...
Julia Kluchevskaia
(NRNU MEPHI)
08/09/2015, 18:00
8. Advanced Generation of THz and X-ray beams
Poster
A design of compact accelerating structure with high beam quality is one of the sufficient problems in contemporary X-ray systems development. A compact biperiodical accelerating structure for medical application with operating frequency 27 GHz was proposed to minimize the accelerator size and weight. More careful calculations of variation characteristics are necessary for such wavelength...
Anastasiya Feshchenko
(NRNU MEPhI)
08/09/2015, 18:00
4. Diffraction Radiation, Smith-Purcell Effect
Poster
A charged particle moving uniformly near a medium surface is known to be a source of so-called diffraction radiation, if there is a longitudinal (along the velocity vector) momentum transfer from the particle to the medium, so the conservation laws allow the photon emission. Thus, at uniform charge motion, parallel to the surface of the homogeneous isotropic medium, no diffraction radiation...
Alexander Potylitsyn
(National Research Tomsk Polytechnic University)
08/09/2015, 18:00
3. Parametric X- Radiation
Poster
Coherent emission from an electron bunch moving in magnetic fields is described using the phase shift for each electron in a bunch [1] $\varphi^{(i)}_{SR}=\exp\left \{i~\mathit{\mathbf{k~r}}_i \right \}$, where $\mathbf k$ the wave vector, $\mathbf r_i= \left\{x_i,y_i,z_i\right\}$ is radius-vector of $i$-th electron. For such radiation mechanism as parametric X-ray radiation (PXR) for which...
Aleksandr Savchenko
(National Research Nuclear University (MEPhI))
08/09/2015, 18:00
4. Diffraction Radiation, Smith-Purcell Effect
Poster
This work is focused on the studying and the theory developing of a Cherenkov diffraction radiation in the terahertz (THz) frequencies range. The effect of the radiation generation, when a charged particle is flying near a target with different forms and sizes, has been studied by the method of polarization currents. For diffraction radiation this method was applied for the first time in [1],...
Alexsandr Ponomarenko
(National Research Nuclear University “MEPhI”)
08/09/2015, 18:00
4. Diffraction Radiation, Smith-Purcell Effect
Poster
Generation of electromagnetic radiation in the frequency region of terahertz (THz) has attracted ever-growing attention for its fundamental significance and interesting applications. In our previous work [1] we investigated source of THz radiation based on electrons moving through the channel with variable radius, where radiation arises due to Cherenkov (CR) and Smith-Purcell (SPR). It was...
Mrs
Irina Ivanova
(Southern Federal University, Rostov-on-Don, Russia),
Vyacheslav Malyshevsky
(Southern Federal University)
08/09/2015, 18:00
2. Transition Radiation
Poster
In this paper we solve the problem of the influence of the charge exchange of accelerated multiply charged ions on the characteristics of the transition radiation. Processes capture or loss of electrons leads to the fact that the fields in each of the medium are different ionic currents. Conditions "instant" capture or losses of electrons in the medium allow time to find the appropriate...
Vasily Sukharev
(National Research Nuclear University (MEPhI))
08/09/2015, 18:00
2. Transition Radiation
Poster
A charged particle crossing an interface between two media with different dielectric properties is a source of transition radiation (TR) [1] applied to the detection of super-high energy particles. In our previous paper [2] we investigated the graphene monolayer as the simplest but along with it real example of two-dimensional layer, in order to study TR characteristics. Also, high graphene...
