Prof.
Vladislav Syshchenko
(Belgorod State University)
24/09/2012, 19:20
Poster Session
The results of computation of transverse energy levels for the electrons moving in the system of parallel atomic strings in the axial channeling regime are presented.
Prof.
Sergey Blazhevich
(Belgorod State University)
24/09/2012, 19:21
Poster Session
A dynamic theory of coherent radiation generated along the velocity of the relativistic electron crossing a layered periodic medium in Bragg geometry is constructed for general case of asymmetric reflection. The group velocities of the X-ray waves relating to different branches of dispersion equation solution are investigated and it is shown that the contributions of these waves in the total...
Mr
Savaล Birol
(Istanbul University)
24/09/2012, 19:22
Poster Session
This is a pilot study to investigate whether it is possible to observe the aforementioned problems of LPM theory in low-Z mediums at an available accelerator environment (i.e. CERN-SPS beams). For this purpose, under the guidance of previous experiments [2, 3] we performed several GEANT4 simulations with realistic setups.
Mr
Enrico Bagli
(FE)
24/09/2012, 19:23
Poster Session
Charged particles impinging on a crystal can be captured into channeling regime provided that their trajectories are aligned with crystalline planes or axes within the critical angle for channeling [1]. Experimental knowledge about channeling of negative particles is less studied due to experimental difficulties arising from peculiarities of particle motion in the crystal. However, recent...
Mr
Onur Buฤra Kolcu
(Istanbul University)
24/09/2012, 19:24
Poster Session
The SPARC facility at LNF delivers 150MeV electron beam with high quality. In this work the โdoglegโ area of the SPARC facility is evaluated for a planned channeling experiment which is a pilot investigation for future positron source experiments. The beam optics simulations for the dogleg section is done up to a crystal and the beam characteristics and the beam spot on the crystal is...
Darya Sergeeva
(National Research Nuclear University "MEPhI")
24/09/2012, 19:25
Poster Session
UV and X-ray polarization radiation of the bunch of charged particles, both diffraction radiation and transition radiation, is investigated theoretically in case when the bunch flies near the edge screen. The form factor is obtained in the most general form, both for longitudinal and transverse distributions particles over the bunch. The form factor is proved to depend on dielectrical...
Dr
Anton Babaev
(Tomsk Polytechnic University)
24/09/2012, 19:26
Poster Session
The channeled ion interacts with the continuous planar electric
field. This electric field not only defines the trajectory of the
ion but also acts on the electrons of ion. Hence, electronic
energy levels are shifted and are split due to Stark effect. The
influence of Stark effect depends on the position of ion in the
planar channel.
In this work the influence of trajectory-dependent...
Dr
Timur Tukhfatullin
(National Research Tomsk Polytechnic University)
24/09/2012, 19:27
Poster Session
The properties of both angular and spatial distribution of 255 MeV electrons at <100> axial channeling in thin silicon crystal has been investigated experimentally at the linac injector of SAGA light source and by computer simulations using a computer code โBasic Channeling with Mathematicaยฉโ BCMโ1.0 developed by the authors. Comparison of the experimental and theoretical results shows a good...
Mr
Philippe Schoofs
(CERN - EPFL)
24/09/2012, 19:28
Poster Session
Channeling in bent crystals is becoming a reliable and efficient technique for collimating beams. At CERN, the installation of crystals in the LHC is under scrutiny by the UA9 collaboration with the goal of investigating if they are a viable option for the collimation system upgrade. This paper describes a new model of channeling in bent crystals which has been developed from scratch in order...
40.
DYNECHARM++: a Software to Simulate the Motion of Charged Particles in Complex Atomic Structures
Mr
Enrico Bagli
(FE)
24/09/2012, 19:29
Poster Session
Charged particle impinging onto a crystal with small angle with respect to an atomic plane or axis can undergo planar or axial channeling regime with high probability. Trajectory of a ultra-relativistic particle under channeling regime can be studied through the usage of continuous potential approximation [1] and approximation of relativistic equations of motion [2]. Averaged electric field...
Dr
Vladimir Ganenko
(National Scientific Center "Kharkov Institute of Physics&amp;Technology", Kharkov, Ukraine)
24/09/2012, 19:30
Poster Session
In this report it is presented results of data processing and analysis on studying radiation spectra of electrons with energy ~200 MeV in a diamond and silicon crystals at orientations when the electrons move near the crystal axes and planes. Preliminary results were presented in [1].
At energies of some hundred MeV the coherent effects in radiation resulted from an electron dynamic in the...
Dr
Evgeny Mazur
(NATIONAL RESEARCH NUCLEAR UNIVERSITY MEPHI)
24/09/2012, 19:31
Poster Session
A theory of the energy losses for the quantum channeled particle is developed. The probability of generating plasmons in the case of "channel-plasmonโ resonance is calculated. The possibility of appearance of the peaks in the curve of the energy loss on the particle energy fixing the distance between the transverse levels of the cross-motion is evaluated. The transition probabilities of ...
Mr
Sergey Abdrashitov
(National Research Tomsk State University, National Research Tomsk Polytechnic University)
24/09/2012, 19:32
Poster Session
Here, we carry out computer simulation of radiation energy loss of the 255MeV electrons and positrons at <100> axial and (100) planar channeling in 20 ฮผm silicon crystal taking into account the angular divergence of the initial electron beam, using computer code BCM-1. The possibility to align thin crystals using the orientation dependence of channeling radiation energy loss is discussed.
Prof.
Yuri Kunashenko
(National Research Tomsk Polytechnic University; Tomsk State Pedagogical University)
24/09/2012, 19:33
Poster Session
In the present report we calculate the cross โ section of radiation from axially channeled polarized electron.
Prof.
Levon Grigoryan
(Institute of Applied Problems in Physics)
24/09/2012, 19:34
Poster Session
The radiation from a particle in flight through a plate, the parameters of which along the direction of motion change according to an arbitrary periodical law, has been investigated. The expressions for determination of spectral-angular distribution of radiation energy in vacuum (at large distances from the plate) are derived. The results of corresponding numerical calculations are given.
Dr
Andrey Olchak
(MEPhI, Russia)
24/09/2012, 19:35
Poster Session
Ultra relativistic electrons, moving in a channel along electron plane, may occupy only certain discrete energy quantum levels. Transition between levels is accompanied with emitting electromagnetic radiation. Due to high energy of electrons and due to Lorenz effect, energy of this radiated emission can be very high
This radiation can be additionally stimulated by certain interference with an...
Mr
Konstantin Kruchinin
(Tomsk Polytechnic University)
24/09/2012, 19:36
Poster Session
When a charged particle moves in a medium (or close to it), different types of
polarization radiation can arise: Cherenkov, transition, diffraction radiation, etc.
Because the particle's radiation losses are small compared to its total energy, polarization radiation can be used for non-intercepting beam diagnostic in modern accelerators [1]. Therefore, it is of great interest to investigate...
Prof.
Yuri Kunashenko
(National Research Tomsk Polytechnic University; Tomsk State Pedagogical University)
24/09/2012, 19:37
Poster Session
In a present report we develop theory and study coherent bremsstrahlung emitted from planar channeled positrons passing through crystal with small angle with respect to crystal axis
Mr
Evgenii Frolov
(National Research Tomsk Polytechnic University)
24/09/2012, 19:38
Poster Session
The results of estimation and modeling of nonrelativistic electrons' dynamics in standing electromagnetic wave field, formed by crossed laser beams and accelerating electrostatic field, are shown here. Special interest was paid to defining the conditions of charged particles' bound state occurrence in such fields: a part of the electron beam might be trapped, that could be described as...
Dr
Oleg Bogdanov
(LNF&TPU)
24/09/2012, 19:39
Poster Session
In this report we have presented the results of our study on the problem of dechanneling for the SPARC electron beam energies. Dechanneling processes for electrons in (111), (110), (100) Si crystals based on the solution of Fokker-Planck equation have been studied. The influence of beam redistribution due to the processes of electron both dechanneling and rechanneling on spectral intensity of...
Dr
Evgeny Bessonov
(Lebedev Physical Institute RAS)
24/09/2012, 19:40
Poster Session
Possible parameters of Light Sources based on Backward Rayleigh scattering of laser photons on relativistic ion beams in storage rings are discussed. Both electronic and nuclear ion transitions can be used. Different schemes of ion beam cooling are discussed to decrease the emittance of ion beams and such a way to increase the brilliance of the Light Sources.
Mr
Igor Kyryllin
(Akhiezer Institute for Theoretical Physics of National Science Center Kharkov Institute of Physics and Technology)
24/09/2012, 19:41
Poster Session
The results of recent IHEP (Protvino, Russia) experiment on 50 GeV proton beam extraction from the accelerator by means of a bent crystal are discussed.
Dr
Anton Babaev
(Tomsk Polytechnic University)
24/09/2012, 19:42
Poster Session
This work is devoted to the aspect of crystal collimation concerning the interactions between projectiles of a collimated beam and nuclei of a bent crystal used as a collimator (inelastic nuclear interactions, INI). Namely, here we continue to analyze
the dependence of INI intensity on crystal orientation. Additionally to that analysis here we consider the non-saturated regime of beam passage...
Dr
Anton Babaev
(Tomsk Polytechnic University)
24/09/2012, 19:43
Poster Session
In this work we present the computer code to simulate the influence of crystal collimator on the particle orbits in the storage ring. The code is adopted to be used together with ICOSIM \& ICOSIM++ codes. ICOSIM \& ICOSIM++ allow observing the
particle trajectory through the sequential magnetic collimators of different types. Our program uses the input data in ICOSIM format, simulates the...
Mr
Seyed Ali Mahdipour
(Hakim Sabzevari University)
24/09/2012, 19:44
Poster Session
A non conventional positron source using the intense ฮณ radiation from different planes and axes of Si, C, Ge and W crystals which materialize into e+e- pairs in a tungsten amorphous converter is described. In this work we have calculated channeling radiation spectra from different planes and axes of Si, C, Ge and W crystals. The dependence of radiation on the incident angle of electrons are...
Ms
Elena Fiks
(National Research Tomsk Polytechnic University)
24/09/2012, 19:45
Poster Session
Here, we investigate in detail the influence of channelling in an optically transparent crystal on Cherenkov radiation from relativistic electrons. The obvious break of the Tamm-Frank condition for appearance of the Cherenkov radiation (rectilinear motion with a constant velocity, greater than the phase velocity of light in a crystal) is due to periodic or quasi-periodic motion under...
Dr
M.A. Aginian
(Yerevan Physics Institute)
24/09/2012, 19:46
Poster Session
Theoretical and numerical results on the spectral and angular distributions as well as on total number of the radiated photons of the coherent X-ray channeling radiation (CXChR) produced by microbunched beams channeled in single crystals are obtained. The results show that for certain conditions CXChR has spectral and angular distributions much narrower than the channeling radiation of single...
Prof.
L.A. Gevorgian
(Yerevan Physics Institute)
24/09/2012, 19:47
Poster Session
Analytical and numerical results are obtained on the angular and spectral distributions as well as on the total number of the photons of the coherent X-ray crystalline undulator radiation (CXCUR) produced by microbunched beams passing through a crystalline undulators (CU). The results show that one can use CXCUR for studying the microbunching process in XFELs and for production of additional...
Dr
Ilya Polimatidi
(M.V. Lomonosov Moscow State University)
24/09/2012, 19:48
Poster Session
Poster
The subject of this work is description and investigation of some of the recently demonstrated phenomena in the thin crystal channeling related to charged particle refraction effects via computer simulations based on methods developed in [1,2].
In the proposed model charged particle beam evolution is simulated using the trajectory- based approach. The latter can be viewed as the Monte-Carlo...
