Conveners
PS: Poster Session
- Dariush Hampai (LNF)
Description
Session PS1
Mr
Sergei Anishchenko
(Research Institute for Nuclear Problems)
10/6/14, 5:00 PM
Poster
We study the features of cooperative parametric (quasi-Cherenkov) radiation arising when an electron bunch passes through a crystal (natural or artificial) under the conditions of dynamical diffraction of electromagnetic waves in the presence of shot noise.
It is shown that the intensity of cooperative quasi-Cherenkov radiation emitted at small angles to the particle velocity direction...
Dr
Evgeny Mazur
(NATIONAL RESEARCH NUCLEAR UNIVERSITY MEPHI)
10/6/14, 5:00 PM
Poster
In the channeled regime a particle loses its energy to generate the collective and single-particle excitations in the crystal at the same time with the emission of photons. This process is accompanied with transitions of particle from one transverse energy discrete state into another. A theory of energy losses and the corresponding excitation of the crystal for the quantum channeled particle...
Prof.
Nikolay Kalashnikov
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia)
10/6/14, 5:00 PM
Poster
It is well known that the energy and momentum conservation laws forbid positron-electron annihilation, producing the single photon only. It can produce two photons in vacuum, or the process is possible with a participation of the third body.
The situation can be essentially changed in a single crystal when one or the both leptons are moving in the channeling regime when the transverse motion...
Prof.
Viktor Tikhomirov
(INP Minsk)
10/6/14, 5:00 PM
Poster
Though crystal undulators (CUs) were devised long ago, reliable realistic description of their functioning has become possible only after the recent development and experimental validation of the corresponding simulation tool. A thorough numerical analysis of both conducted and suggested experiments reveals limited perspectives of development of electron CUs and stimulates a return to the...
Dr
Nickolae Maksyuta
(Kiev National Shevchenko univmsksyu)
10/6/14, 5:00 PM
Poster
The given paper investigates the orientation motion of charged particles (electrons, positrons, ions) in charged [100] and [110] axes of CsCl-type crystals. Principle difference from previous work which investigated similar problems is in the usage of more correct and ground type of potential of charged axes for such crystals.
This potential is consists of the following steps: 1) the...
Dr
Valery Kaplin
(Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
The effect of asymmetric near-surface X-rays generation, observed recently at a grazing interaction of 33 MeV electrons with a 56 μm Si plate placed along the electron beam in a goniometer into the betatron chamber in a magnetic field, is presented. The evolution of the angular patterns of X-rays generated when changing the orientation of the Si plate relative to the electron beam showed...
Dr
Behnam Azadegan
(Hakim Sabzevari University), Mr
Seyed Ali Mahdipour
(Hakim Sabzevari University), Dr
Wolfgang Wagner
(HZDR Dresden)
10/6/14, 5:00 PM
Poster
Positron production based on the generation of channeling radiation by relativistic electrons channeled along the <100> axis of a W crystal and the subsequent conversion of radiation into e+e--pairs in an amorphous tungsten target is described. Electron dechanneling is considered by solving of the Fokker-Planck equation which describes the passage of axially channeled electrons through a thick...
Ramazan Nazhmudinov
(Belgorod State Ubiversity)
10/6/14, 5:00 PM
Poster
A.G. Afonin1, G.I. Britvich1, Yu.A. Chesnokov1, A.A. Durum1, M.Yu. Kostin1,
V.A. Maisheev1, D.A.Savin1, A.A. Yanovich1, R.M. Nazhmudinov2, A.S. Kubankin2,
N.F. Shul’ga3,4, A.V. Shchagin2,3, S.R. Uglov5, A.S. Gogolev5
1Institute of High Energy Physics, Moscow Region, Protvino, Russia
2Belgorod State University, Belgorod, Russia
3Kharkov Institute of Physics and Technology, Kharkov,...
Mr
Ilia Fartushev
(Tomsk State Pedagogical University)
10/6/14, 5:00 PM
Poster
In the present report we consider the cross - symmetrical process to the channelling radiation the electron - positron pair production by channelled positron. We derive the differential over emission angles cross - section of the electron - positron pair production by channelled positron. The angular distribution of created electron and positron is investigated. The dependence on initial...
Prof.
Yury Pivovarov
(National Research Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
Unless it’s long history and successful applications in detector physics, many fundamental properties of Cherenkov radiation from different types of relativistic particles still are not studied in detail, see e.g. [1-3] and references therein. Here, we report on recent first experiment on Cherenkov light measurements from 255 MeV electrons at SAGA-LS accelerator facility [4]. The target used...
Dr
Gennady Naumenko
(Tomsk Polytechnic University), Mr
Vitold Bleko
(National Research Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
The diffraction and Cherenkov radiation have been observed in the millimeter wavelength range from 8 to 30 mm emitted by bunched electron beams of 6.1 MeV passing near a Teflon target. The radiation intensity at wavelength mm is enhanced by a factor in comparison incoherent radiation, the value of this factor equal to the number of electrons in the bunch. Properties of the radiations have...
Mr
Anatoly Konkov
(Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
The Cherenkov radiation (ChR) is generated in the soft X-ray region in the vicinity of the absorption edges, where the well-known Cherenkov condition is fulfilled [1]. This X-ray ChR peculiarity can be useful for different applications such as development of the compact, narrow-band, and intense soft X-ray sources [2, 3]. Authors of the experiments [3, 4] have measured the X-ray yield in the...
Mr
Sergei Abdrashitov
(National Research Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
Electromagnetic waves is proven [1] to possess an intrinsic angular momentum. Two alternative and concordant approaches to the definition of the theory of the angular momentum of the electromagnetic field and general properties of the angular momentum of synchrotron radiation are described in [2].
The computer code BCM-1 [3] is able to calculate the trajectories of electrons and positrons at...
Dr
Timur Tukhfatullin
(National Research Tomsk Polytechnic University), Prof.
Yury Pivovarov
(National Research Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
We present the result of the experiments and comparison with computer simulation and analysis of channeling radiation spectra in HWC as well. The comparison with radiation spectrum from an electron moving in an arc(never studied experimentally) is also performed.
Mr
Gennady Sushko
(Frankfurt Institute for Advanced Studies)
10/6/14, 5:00 PM
Poster
In the talk the results of simulations of axial channeling of electrons and positrons in straight and periodically bent Si crystals will be reported and compared with the planar channeling case [1-3]. The simulations of trajectories of channelled projectiles with accounting for the all-atom interactions have been performed by solution of the classical relativistic equations of motion using...
Mr
Sergei Abdrashitov
(National Research Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
S.B. Dabagov a,b
S.V. Abdrashitov c,d, O.V. Bogdanov c, Yu.L. Pivovarov c, T.A. Tukhfatullin c
a INFN Laboratori Nazionali di Frascati. Frascati (RM), Italy
b LPI RAS, NRNU MEPhI, Moscow, Russia
c National Research Tomsk Polytechnic University, Tomsk, Russia
d National Research Tomsk State University, Tomsk, Russia
The problem of positron beam generation remains of interest during...
Dr
Hovhannes Muradyan
(Institute of Applied Problems in Physics, Yerevan, Armenia)
10/6/14, 5:00 PM
Poster
A two-dimensional periodic (the so-called continuous) potential ... is studied, that is obtained by replacing the true potential of a single crystal by the potential averaged (i) over all atomic chains, which are parallel to the selected crystallographic axis of a single crystal, and (ii) over the thermal vibrations of atomic cores of the single crystal: ...=... (Z-axis of the cylindrical...
Prof.
Sergey Blazhevich
(Belgorod National Research University)
10/6/14, 5:00 PM
Poster
The dynamical theory of coherent X-ray radiation generated in a single-crystal target by the beam of relativistic electrons with a finite divergence is developed in the scattering geometry Laue. Coherent X-ray emission is considered in the general case of asymmetric reflection of the Coulomb field of the electron in the form of two emission mechanisms contributions: of the parametric X-ray...
Prof.
Igor Vnukov
(Belgorod National Research university, Belgorod, Russia)
10/6/14, 5:00 PM
Poster
Influence of real photon diffraction on parametric X-ray radiation angular distribution in thin perfect crystals
Yu. A. Goponov, S.A. Laktionova, O.O. Pligina, M.A. Sidnin, I.E. Vnukov,
Belgorod National Research University, 14 Studencheskaya str., 308007 Belgorod, Russia
Recently it has been suggested to use parametric X-ray radiation (PXR) angular distribution of fast particles...
Mr
Artur Movsisyan
(Institute of Applied Problems of Physics NAS RA, Yerevan, Armenia)
10/6/14, 5:00 PM
Poster
The results of experimental investigation of the phenomenon of parametric X-ray radiation (PXR) emitted by relativistic electrons with 40-50 MeV energy is presented. Comparison results of propagation of PXR either forward or beckward to the motion of relativistic electrons is analyzed. New opportunities for crystal structure analysis with light atoms is offered.
Dr
Konstantin Lekomtsev
(High Energy Accelerator Research Organisation (KEK))
10/6/14, 5:00 PM
Poster
THz frequency region is very challenging part of electromagnetic spectrum for radiation generation and detection because of relatively low maturity level of components and systems that operate in this region. Although situation is improving with more and more advances in the field, much of challenging and exciting potential still remains untapped [1].
Recent advances in generation of short...
Mr
Anatoly Konkov
(Tomsk Polytechnic University), Mr
Dmitry Shkitov
(National Research Tomsk Polytechnic University)
10/6/14, 5:00 PM
Poster
Nowadays the electron micro-train beams are useful for different applications such as multibunch resonant plasma wakefield acceleration [1], particle acceleration by stimulated emission of radiation [2], generation of intense coherent electromagnetic radiation [3, 4] and etc. Therefore bunch-to-bunch interaction investigation becomes essential. In the general case micro-train is from 2 up to a...
Prof.
Nikolai Shul'ga
(Akhiezer Institute for Theoretical Physics of NSC KIPT)
10/6/14, 5:00 PM
Poster
We will report estimation of the formation (interference) length of quantum emitted by the electron passing through the undulator based on statistics of recoils undergone by the electron due to emission of quanta. As it is shown, the number of coherent quanta is inversely proportional to the energy of the electron for a fixed adulator period, and in direct proportion to the undulator for a...
Dr
Micola Bondarenco
(Kharkov Institute of Physics and Technology)
10/6/14, 5:00 PM
Poster
Interference pattern in the spectrum of non-dipole bremsstrahlung on two amorphous foils is investigated. Apart from suppression at lowest photon energies, there is also an enhancement in the adjacent spectral region, and in classical electrodynamics, the net effect of suppression and enhancement must to be zero. We study the location and origin of the spectral features, comparing predictions...
Ms
Darya Sergeeva
(National Research Nuclear University "MEPhI")
10/6/14, 5:00 PM
Poster
In this work the X-Ray diffraction radiation from the bunch with Gaussian distribution of the particles is considered. The expressions for coherent and incoherent form-factors are obtained with taking into account the particles moving parallel to the surface of the target at arbitrary angles to the general direction of the bunch velocity. The quantitative and qualitative changes in the...
Prof.
Vladimir Vysotskii
(Kiev National Shevchenko Univ, Kiev, Ukraine)
10/6/14, 5:00 PM
Poster
The radiation processes associated with a supersonic liquid jet exhausting from narrow dielectric or metal channels are considered. During researches of different regimes of cavitation we have observed several anomalous radiative phenomena: very intensive optical glow of liquid jet and controlled X-ray radiation. It has been found for the first time that the output of the channel and the...
Dr
Alexander Shchagin
(Kharkov Institute of Physics and Tecknology)
10/6/14, 5:00 PM
Poster
A.V. Shchagin1,2, V.S. Miroshnik1, V.I. Volkov1
1Kharkov Institute of Physics and Technology, Kharkov, Ukraine
2Belgorod State University, Belgorod, Russia
Usually, pyroelectric crystals are applied in pyroelectric accelerators. In present paper, the possibility for application of polarized ferroelectric ceramics instead of pyroelectric crystals in a pyroelectric accelerator is shown...
