32.
Twisted Photons and Electrons as a New Tool in Physics of Atoms, Nuclei and Elementary Particles
Prof.
Valeriy Serbo
(Novosibirsk State University)
07/09/2015, 10:20
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Invited
In modern optics there are well known states of the laser beam whose
photons have a nonzero value of the orbital angular momentum projection on
the beam propagation axis. Very recently new experiments had been
performed in which the twisted photons with the energy of two orders of
magnitude larger and smaller had been produced. Moreover, several groups
have reported successful creation of...
Gero Kube
(DESY, Hamburg, Germany)
07/09/2015, 10:50
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Invited
Radiation generated by high-energy particle beams is widely used for
beam diagnostic purposes. Depending on the mechanism of radiation
generation, the emitted wavelength range extends from the THz up to the
X-ray region, thus allowing to measure beam profiles in the longitudinal
and the transverse plane over a wide range. In this talk, basic
considerations for radiation based profile...
Andrey Tyukhtin
(Saint Petersburg State University)
07/09/2015, 11:40
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Invited
We present analytical and numerical investigation of nontraditional methods for obtaining concentrated radiation from particle bunches. The objects considered here are simultaneously "generators" and "concentrators" of radiation. First, we consider dielectric objects which can concentrate radiation near some line or some point. The form of the targets is determined using the ray optics, but...
Viktor Vorobev
(Saint Petersburg State University)
07/09/2015, 12:10
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Three-dimensional and planar periodic structures made of thin conductors and having small period can be used for non-destructive diagnostics of charged particle bunches. Earlier we analysed radiation from bunches moving in volume wire metamaterial and along the boundary of such material. We also studied radiation of bunches moving in the presence of infinite planar structures. Now we consider...
Micola Bondarenco
(NSC Kharkov Institute of Physics and Technology, Ukraine)
07/09/2015, 12:25
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Evaluation of the angular distribution function of multiple Coulomb scattering is improved by deforming the integration contour in the Fourier integral representation into the complex plane of impact parameters. That allows to express the distribution function as a sum of two positive components, hard and soft. The soft component is close to a Gaussian, whereas the hard component incorporates...
Valeriy Katkov
(BINP, Novosibirsk, 630090)
07/09/2015, 12:40
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
In this work, a constant and uniform magnetic field is less than the Schwinger critical value. In turn, an additional constant and uniform electric field is taken much smaller than the magnetic field value. The propagation of a photon in this electromagnetic field is investi-gating. In particular, in the presence of a weak electric field, the root divergence is absent in the photon...
Sergey Galyamin
(Saint Petersburg State University)
07/09/2015, 12:55
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Electromagnetic radiation with terahertz frequencies (0.1-10 THz) is supposed to be a promising tool for a number of applications. Efficient terahertz emission can be achieved, for example, using the beam-driven dielectric loaded structures [1]. Under certain approximations, the problem of transformation of a single TM mode with a high number at the open end of a cylindrical waveguide with a...
Prof.
Nikolay Kalashnikov
(National Research Nuclear University "MEPhI")
07/09/2015, 14:30
The channeled particles is characterized by the bound quantum states of its transversal motion. Photon interactions with the channeled particles in a single crystal may be accompanied by the energy transitions between the transverse motion levels of channeling particles. The photon combination (Raman) scattering by the quasi-bound channeled particles leads to the appearance of a frequency...
Dr
Andrea Mazzolari
((University of Ferrara and INFN section of Ferrara (Italy)), Mr
Giacomo Germogli
((University of Ferrara and INFN section of Ferrara (Italy))
07/09/2015, 14:45
In the last years, thanks to innovative techniques for crystals design and fabrication based on silicon micromachining, micrometric and nanometric thick silicon crystal plates suitable for beam manipulation through coherent interactions and hard radiation generation were produced. Thin bent crystals which allowed for the first time efficient steering of negatively-charged particles at sub-GeV...
Dr
Yury Chesnokov
(Institute for High Energy Physics in National Research Centre “Kurchatov Institute”)
07/09/2015, 15:00
The carbon ions +6C with energy 24.8 GeV/u were extracted from the U-70 ring by a bent Si crystal. The deflection angle of a beam by a crystal was 85 mrad. The measured beam intensity in beam line 4a was about 1E05 particles at 1E09 circulated ions in the ring. The scintillation counters were installed in beam center while the semiconductor detector was installed in 43 mm away from the beam...
Timur Tukhfatullin
(National Research Tomsk Polytechnic University)
07/09/2015, 15:15
Half-wavelength crystal (HWC) is a thin crystal, when a channeled particle experiences only one collision with crystallographic plane during its motion through a HWC crystal. Recently, the authors of Ref. [1] experimentally demonstrated that planar channeled 2 MeV protons were successfully mirrored by a thin silicon HWC. In continuation of this work, the mirroring effect was observed at very...
Prof.
Igor Vnukov
(Belgorod National Research University 14 Studencheskaya str., 308007 Belgorod, Russia)
07/09/2015, 15:30
The use of ultra relativistic electron (positron) emission in thin crystals to estimate particle beam spatial sizes for projected electron-positron colliders [1,2] is proposed. The existing position-sensitive X-ray range detectors and the average path of secondary electrons in a detector restrict the minimum value of the measured beam size to a level of approximately 10 μm, which is far...
Prof.
Vladislav Syshchenko
(Belgorod National Research University, Belgorod, Russian Federation)
07/09/2015, 15:45
The motion of fast electrons through the crystal under axial channeling could be both regular and chaotic [1, 2]. The chaotic character of quantum systems manifests itself in different ways [3]. The evidence of quantum chaos in statistical properties of energy spectra of channeling electrons had been demonstrated in [4]. In the present report we demonstrate qualitative difference between...
Konstantin Korotchenko
(National Research Tomsk Polytechnic University)
07/09/2015, 16:30
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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...
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...
Alexander Shchagin
(Kharkov Institute of Physics and Technology)
08/09/2015, 09:00
A.V. Shchagin
Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
Belgorod State University, Belgorod 308015, Russia
The parametric X-ray radiation (PXR) is considered as a result of the diffraction in a crystal of virtual photons associated with relativistic charged particle moving through the crystal. Formulas for PXR Fresnel coefficients are obtained in kinematic...
Andrei Benediktovitch
(Belarusian State University)
08/09/2015, 09:30
The operation of synchrotron x-ray light sources and free electron lasers opened new era in the investigation of matter on Angstrom lengthscale with fs time resolution. However, need for GeV electron accelerators and hundreds meter long undulator modules results in high construction, which makes the existing facilities extremely overbooked. In recent years there were investigated several...
Sergey Blazhevich
(Belgorod National Research University)
08/09/2015, 09:45
Diffracted transition radiation (DTR) generated by divergent beam of relativistic electrons crossing a single-crystal plate in different (Laue, Bragg) scattering geometry have been considered for general case of asymmetric reflection of electron coulomb field relative to the entrance target surface. The expressions for spectral-angular density of DTR and parametric X-ray Radiation (PXR) are...
Dr
Alexander Kubankin
(Belgorod National Research University)
08/09/2015, 10:00
The characteristics of Parametric X-ray radiation (PXR) from crystalline and polycrystalline targets (in the last case also called polarization bremsstrahlung (PB)) are well studied. An important task to be performed in this field is the measurement of the radiation spectral-angular characteristics from textured polycrystalline targets because such interaction represents the transition between...
Prof.
Igor Vnukov
(Belgorod National Research University, 14 Studencheskaya str., 308007 Belgorod, Russia)
08/09/2015, 10:15
The authors of the papers [1,2] proposed to measure the transverse size of an electron beam using the PXR spatial distribution at short distances between a crystalline target and a detector. The experiment described in Ref. [3] was performed with the 855 MeV electron beam of the MAMI-B microtron and a 50 μm thick silicon crystal (100) acting as target, which was oriented under a Bragg angle of...
Vahan KOCHARYAN
(Institute of Applied Problems of Physics of NAS RA, Yerevan, Armenia, National Research Tomsk Polytechnic University, Tomsk, Russia)
08/09/2015, 10:30
This work is devoted to investigations of PXR which is generated by 20-50 MeV electrons in the X-cut quartz single crystal at the presence of the temperature gradient. For this propose the beam line LEA-50 (YerPhI) has been constructed with the beam spot diameter of 1 mm, the beam energy spread up to 1%, the beam current up to 0.1 $\mu$A.
At the first stage we have investigated X-ray...
Alexandr Savchenko
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
08/09/2015, 10:45
Some years ago parametric X-ray radiation (PXR) was suggested as a good tool for bunch diagnostic[1], and recently this method was confirmed experimentally[2]. In the theory of PXR there exist two main approaches, kinematic and dynamical ones. The dynamical theory of PXR for divergent beams was suggested in paper[3]. In this article the Gaussian distribution was used to describe the divergence...
105.
Status and Perspectives for Channeling Physics: from Crystal Undulators to Capillary Waveguides
Sultan Dabagov
(INFN Laboratori Nazionali di Frascati, 00044 Frascati (RM), Italy RAS P.N. Lebedev Physical Institute, Moscow, Russia National Research Nuclear University MEPhI, Moscow, Russia)
08/09/2015, 11:30
5. Coherent Bremsstrahlung and Channeling Radiation
Invited
Channeling is the phenomenon well-known in the world mostly related to the propagation of the beams of charged particles in aligned crystals. However, recent studies have shown the feasibility of channeling phenomenology application for description of other various mechanisms of interaction of charged as well as neutral particles beams in solids, plasmas and electromagnetic fields covering the...
Mr
Giacomo Germogli
(University of Ferrara and INFN section of Ferrara (Italy))
08/09/2015, 12:00
5. Coherent Bremsstrahlung and Channeling Radiation
Oral
Electromagnetic radiation emitted by channeled and volume reflected sub-GeV electrons in a bent crystal was measured at MAMI (Germany). A 855 MeV electron beam hit a mechanically bent 30.5 μm thick Si crystal. Crystallographic directions and holder design are optimized to excite quasi-mosaic effect of the (111) planes, while thickness was reduced down to the order of the dechanneling length...
Dr
Vahram Parazian
(Institute of Applied Problems in Physics NAS RA)
08/09/2015, 12:15
5. Coherent Bremsstrahlung and Channeling Radiation
Oral
A.R. Mkrtchyan, V.V. Parazian, A.A. Saharian
Institute of Applied Problems in Physics NAS RA
25 Nersessian Street, 0014 Yerevan, Armenia
We investigate the coherent bremsstrahlung from electrons moving at small angles with respect to a deformed graphene sheet. For an arbitrary periodical deformation of the sheet, a formula is derived for the corresponding cross-section as a function of...
Mikhail Mazuritskiy
(Southern Federal University)
08/09/2015, 12:30
5. Coherent Bremsstrahlung and Channeling Radiation
Oral
Propagation of X-rays through microcapillaries is a phenomenon of great interest due to the high efficiency in the transport of the radiation by microcapillary holes and, as consequence, due to the possibility to design new optical elements suitable to shape an intense x-ray beam. Actually, because the technology based on the capillary optical elements can deliver a high flux density within a...
Dr
Yuri Krotov
(Joint -Stock Company "POLYUS Research Institute of M. F. Stelmakh", Russia, 117342 Moscow, Vvedenskogo 3, kor.1)
08/09/2015, 12:45
5. Coherent Bremsstrahlung and Channeling Radiation
Oral
The presentation is devoted to theoretical analysis of Polarization Bremsstrahlung (PBrS) [1] due to the scattering of fast electrons on metallic nanosphere embedded in dielectric matrix in frequency region near dipole and quadrupole plasmon resonances. Here we account for plasmonic interference effects which arise in frequency-angular distribution of PBrS. These effects are the consequence of...
Koryun Gevorgyan
(Yerevan State University)
08/09/2015, 13:00
5. Coherent Bremsstrahlung and Channeling Radiation
Oral
In the present work investigated the problem of radiation of positron bunch in the system of the packed nanotubes. In this work used model of the harmonic potential which is justified since on the one hand the number of positrons near the axis of the nanotubes region is small, and on the other hand their contribution to the formation of the total radiation is also small. The problem is solved...
Yasushi Hayakawa
(Nihon University)
08/09/2015, 15:00
The new project of a THz-wave light source is in progress at the parametric X-ray (PXR) beamline of the Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University. The THz-wave source is based on coherent transition radiation (CTR) emitted from a metal foil inserted downstream of a crystal target that is the radiator of PXR. A beryllium foil is the most prospect...
Pavel Karataev
(Royal Holloway, University of London)
08/09/2015, 15:30
Transverse beam size and emittance monitoring is a crucial task in future linear colliders. Beam diagnostics is required at all stages of the beam production, acceleration and delivery. The diagnostics equipment has to be suitable for electron/positron beams form MeV to TeV energies with resolution form nanometres to hundreds of microns and beam intensities from a fraction to hundreds of nC....
Leonid Sukhikh
(Tomsk Polytechnic University)
08/09/2015, 16:00
Transverse beam profile diagnostics in electron accelerators is usually based on direct imaging of a beam spot via visible radiation (transition or synchrotron radiation). In this case, the fundamental resolution limit is determined by radiation diffraction in the optical system. A method to achieve a resolution beyond the diffraction limit is to perform point spread function (PSF) dominated...
Leonid Sukhikh
(Tomsk Polytechnic University)
08/09/2015, 16:15
Transverse beam profile diagnostics in the case of micron-scale beam sizes from modern electron accelerators is a challenging task. Backward transition radiation (BTR) imaging in the visible spectral region is usually applied but it is close to the diffraction limit, i.e. the measured beam image is dominated by the point-spread function (PSF) [1,2]. In order to improve the resolution and to...
Michele Bergamaschi
(CERN)
08/09/2015, 16:30
Optical Diffraction Radiation (ODR) is a promising non-destructive transverse beam size diagnostics for future high intensity accelerators. The ODR signal is much less intense than that from the well-known Optical Transition Radiation (OTR), so synchrotron radiation and wake-fields can interfere with the signal, complicating the data analysis. The insertion of a mask upstream of the target...
Sergey Uglov
(Tomsk Polytechnic University)
08/09/2015, 17:00
In a number of studies [1-4] it has been theoretically and experimentally shown that at the interaction of a relativistic electron with a periodic structure, a quasimonochromatic component of X-rays is generated in the direction of the Bragg diffraction.
The mechanism of this radiation is similar to the parametric X-ray radiation of relativistic charged particles in crystals. This report...
Tatiana Alekhina
(Saint- Petersburg State University)
08/09/2015, 17:15
Electromagnetic field of a charge that uniformly moves in a circular waveguide with a semi-infinite dielectric possessing frequency dispersion of a resonant type is under consideration. This problem is a generalization of the case of a nondispersive dielectric (considered earlier). The study can be interesting for development of new methods of generation of electromagnetic radiation and...
Mr
Hayk Gevorgyan
(Yerevan State University)
08/09/2015, 17:30
It is given a brief review of the theory of the stimulated coherent X-ray transition radiation produced in a RTR stack of plates (StRTR) under the influence of accompanying intense monochromatic beams by micro bunched electrons. Though there are tens of publications on the corresponding gain of the amplification of the primary X-ray photons by StRTR, nevertheless, the absence of some...
Mr
Ihar Lobach
(Belarusian State University)
08/09/2015, 18:00
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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...
Nicolas Delerue
(LAL, CNRS & Université Paris-Sud)
09/09/2015, 09:00
4. Diffraction Radiation, Smith-Purcell Effect
Invited
We report on the recent studies of Smith-Purcell radiation aimed at developing a longitudinal bunch profile monitor. In particular we report on first measurements of the polarization and azimuthal distribution of the radiation. We also report on studies done in the linac of synchrotron SOLEIL to measure the distribution of Smith-Purcell radiation. Using these results we discuss the plan of...
Gennady Naumenko
(Tomsk Polytechnic University)
09/09/2015, 09:30
4. Diffraction Radiation, Smith-Purcell Effect
Invited
Investigations of the Smith-Purcell radiation (SPR) were began with non-relativistic electron beams with some unexpected experimental results. Further the experimental investigations were performed with relativistic electron beams for application to beam diagnostics. Large discrepancy between different theoretical models significantly increases the role of experimental studies of this...
Alexey Tishchenko
(National Research Nuclear University (MEPhI))
09/09/2015, 10:00
4. Diffraction Radiation, Smith-Purcell Effect
Invited
Polarization radiation arises when a moving charge acts upon matter by its Coulomb field, and the matter polarized by this dynamically changing field becomes a source of radiation. The charged particle itself can move uniformly and nevertheless generate electromagnetic radiation: widely known Cherenkov and Transition radiations, Diffraction radiation (DR), Smith-Purcell radiation (SPR),...
Dan Verigin
(Tomsk Polytechnic University)
09/09/2015, 10:30
We have studied theoretically the process of generation and accumulation of coherent diffraction radiation (CDR) produced by short electron bunches in open resonator at LUCX facility of ATF KEK. In contrast with conventional applications of resonators for FELs in our case radiation is generated by electron bunches passing through vacuum holes in both mirrors (1,2).
In this report we compare...
Gennady Naumenko
(Tomsk Polytechnic University)
09/09/2015, 10:45
During the interaction of the relativistic electrons field with a dielectric target various types of electromagnetic radiation, such as Cerenkov radiation, diffraction radiation, transition radiation can be generated. In this report we present the results of experimental studies of the diffraction radiation generated by relativistic electrons in a dielectric target at the interface...
Vasily Sukharev
(National Research Nuclear University (MEPhI))
09/09/2015, 11:30
When a relativistic charged particle moves near the surface, field of the particle excites oscillations of the atomic electrons, so the polarization currents arise, giving birth to the secondary electromagnetic field – polarization radiation (PR). If a charged particle moves with constant velocity along the inhomogeneous medium, PR is called diffraction radiation (DR) [1].
It is of interest...
Dr
Yoshitaka Taira
(National Institute of Advanced Industrial Science and Technology (AIST))
09/09/2015, 11:45
Diffraction radiation is emitted when an electron beam passes near an edge or interface between two media with different dielectric constants. Theoretical and experimental investigation of diffraction radiation is performing at several electron accelerator facilities. If the wavelength of the diffraction radiation is longer than a pulse width of electron beam, each radiation is coherently...
Alexei Kanareykin
(St.Petersburg Electrotechnical University "LETI", Russia; Euclid Techlabs LLC,USA)
10/09/2015, 10:00
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Invited
Cherenkov radiation from particle bunches is of considerable importance in many areas of fundamental and applied physics. Recent experiments has demonstrated that proper adjustment of the electron beam parameters to the guiding structure geometry scaled from sub millimeter dielectric waveguides to nanoscale periodic structures allows to generate radiation, ranging from low terahertz to...
Nobuhiro Terunuma
(High Energy Accelerator Research Organization (KEK), Tsukuba, Japan)
10/09/2015, 10:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Invited
We have been developing a high brightness X-ray source based on the Inverse Compton scattering (ICS) between an electron beam and a laser pulse stacked in an optical cavity. The X-ray which energy is in the order of 10 keV, have a wide variety of application for material, biological and medical researches. The synchrotron light sources as the several GeV electron ring have been contributing to...
16.
Intense laser focused profile measurement by scanning electron beam via laser-Compton scattering
Prof.
Masakazu Washio
(Waseda University)
10/09/2015, 11:00
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Laser-Compton scattering (LCS) is a feasible technique to realize the compact, high brightness X-ray source. The laser photons are scattered by high energy electrons and the energy of the electrons is transferred to the photons. Tightly focus of both laser and electron beam makes it possible to achieve the high brightness X-ray source. The LCS is also a quite useful technique for diagnostics....
Dr
Alexey Dik
(LPI RAS)
10/09/2015, 11:15
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Channeling effect in crystals is a very convenient method for charged particle bunches manipulation. In particular, this phenomena can be used for charged particle beams shaping, collimation and extraction. As known, considerable radiation energy losses of channeled particles (due to channeling radiation) can be used as a novel method of beam cooling. However, during such interaction of...
Alexander Potylitsyn
(Tomsk Polytechnic University)
10/09/2015, 11:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
The Thomson scattering of laser photons by a relativistic electron can be considered as radiation in a “light undulator”. Classical formulas describing characteristics of the conventional undulator radiation (UR) are applicable for the radiation in a “light undulator” if it is possible to neglect by recoil effect.
In the opposite case the discrete quantum processes of photon emission ...
Mr
Evgenii Frolov
(P.N. Lebedev Physical Institute of the Russian Academy of Sciences)
10/09/2015, 11:45
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Periodic field structure in the region of two intense laser beams overlapping is capable of trapping charged particles in channeling regime. This phenomenon is called channeling in a lasers field and attracts growing attention of researchers today. The reason for this is the ability to recreate channeling-like conditions in vacuum avoiding particles-matter interaction and decreasing influence...
Xavier Artru
(Université de Lyon, Institut de Physique Nucléaire de Lyon, Université Lyon-I, CNRS/IN2P3, France)
10/09/2015, 12:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Invited
Two phenomena relating light channeled in optical fibers and radiation by moving particles are considered: the first one is light induced by a charged particle in optical fibers (PIGL). We review the basic mechanism, the intensity formula, the spectral and polarization properties and the possible application to beam diagnostic. The second one is a similarity between synchrotron radiation and...
Vitold Bleko
(National Research Tomsk Polytechnic University)
10/09/2015, 13:00
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
Dielectric fibers are widely used in technique for light transport. The ability to use a radiation of relativistic electrons in optical fibers in beam diagnostics was proposed recently [Tikhoplav R *et. al. IPAC’12 Conf. Proc.* 996]. The authors propose a method of measuring the transverse profile of electron beams using a fiber optic array. When an electron propagation through the core of a...
Ms
Veronika Soboleva
(Tomsk Polytechnic University)
10/09/2015, 13:15
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
We present in this work the experimental investigation of the interaction of relativistic electron field with wire metamaterial. The measurements of the spectral-angular characteristics of coherent radiation were done in millimeter wavelength region (10-40 mm) in far-field zone on relativistic electron beam with energy of 6.2 MeV. Used target represent the right triangular prism that consist...
Sergey Uglov
(Tomsk Polytechnic University)
10/09/2015, 13:30
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
According to theoretical estimates (e.g., [1]), due to a jump of the dielectric permittivity of Al near the L edge of photon absorption (Е = 72.6 eV) the Cherenkov radiation (CR) must be observed at the angles $\theta = 10^o–15^o$ relative to the electron path. This report presents the results of experimental study of the angular density of extreme ultraviolet (EUV) radiation generated by 5.7...
Anna Kotanjyan
(Yerevan State University)
10/09/2015, 13:45
1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation
Oral
As an application of general results of the radiation for a charge moving around a dielectric cylinder along a helical trajectory the projection of which on the plane perpendicular to the cylinder axis is an arbitrary closed curve, we study the radiation intensity of the transversal oscillation of rotating charged particle. We analyse the influence of the trajectory shift from the circular one...
Dr
Alexander Aryshev
(High Energy Accelerator Research Organization (KEK), Tsukuba, Japan)
11/09/2015, 09:30
The motivation for developing linac-based THz source is coming from the growing interest to THz radiation. High gradient photo-cathode RF gun and few tens of femtosecond laser system are used to generate a pre-bunched electron beam. We have proposed two approaches to produce the intense radiation beams in the range of 0.1-5 THz based on Coherent Smith-Purcell Radiation (CSPR) and Coherent...
Konstantin Lekomtsev
(KEK)
11/09/2015, 10:30
Development of compact, tunable, and high power THz radiation sources is an important task in the field of THz science [1]. Short, hundreds of femtoseconds duration electron bunches may produce coherent THz radiation, by means of Smith-Purcell radiation (SPR) in super – radiant regime [2], occuring when a micro-bunched electron beam travels in the vicinity of a periodic target.
LUCX...
Aiveen Finn
(Royal Holloway, University of London)
11/09/2015, 10:45
Schottky barrier diodes (SBD) are known for their low noise, ultra-fast response and excellent sensitivity. They are often implemented as detectors in the millimetre wavelength regime. Micro-bunch instabilities (MBI) have been detected at many lights sources around the world including the Diamond Light Source, UK. These MBI can result in bursts of coherent synchrotron radiation (CSR) with...
Leonid Sukhikh
(Tomsk Polytechnic University)
11/09/2015, 11:20
Numerical simulation of narrow-band THz source based on coherent Smith-Purcell radiation (CSPR) generated by a train of microbunches was carried out using particle-in cell code KARAT [1]. The simulation was carried out for beam parameters of LUCX facility (KEK, Tsukuba, Japan) namely beam energy – 10 MeV, microbunch length – 330 fs, microbunch repetition rate – 1 THz, transverse bunch size –...
Konstantin Lekomtsev
(KEK)
11/09/2015, 11:35
In the past decade accelerator based sources of THz radiation have seen progress in generation of short femtosecond duration electron bunches as well as in THz radiators development. Capillary structures capable of producing powerful Cherenkov radiation wakefields have been used for THz radiation generation [1] as well as for energy modulation in electron beams [2]. Introduction of the...
Alexandr Altmark
(Saint-Petersburg State Electrotechnical University)
11/09/2015, 11:50
We present new method of THz Cherenkov radiation excited in dielectric waveguide by relativistic electron bunches. The sequence of bunches generates monochromatic radiation. The frequency of radiation is defined by the distance separation between the bunches. The studies were carried by using the original updated BBU-3000 code which permits to take into account additional options: quadrupole...
Dr
Karo Ispirian
(Alikhanian National Laboratory, Yerevan Physics Institute)
2. Transition Radiation
Oral
For the production of intense monochromatic X-ray bunches it is considered the radiation produced by relativistic electrons in a radiator consisting of a stack of plates combined with a four-crystal X-ray monochromator (FCrM). The mechanism of resonance transition radiation (RTR) produced by electrons in the radiator is considered in three different schemes for obtaining single and periodic...