Channeling 2016

25-30 September 2016
Europe/Rome timezone
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Displaying 200 contributions out of 200
Type: Poster Session: PS2: Poster Session
Recently we have reported on specific form of dielectric target that effectively concentrates Cherenkov radiation from a point charge into a small vicinity of the focus point [1]. It was shown that for decimeter-sized target made from typical dielectric (e.g., Teflon) and terahertz radiation frequencies, the field in focus can be around two orders of magnitude larger compared to the field at the s ... More
Presented by Dr. Sergey GALYAMIN on 27 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
Shot noise, intrinsic to electron beams, is the cause of statistical fluctuations in radiation generated by quasi-Cherenkov generators operating in stationary and non-stationary regimes. Radiated power and instability time growth are the main output parameters characterizing the dynamics of electron beam interacting via the radiation field. Shot-noise related fluctuations of radiated power ... More
Presented by Mr. Sergei ANISHCHENKO on 27 Sep 2016 at 18:40
Intense THz radiation is extensively used for different applications including diffraction and spectroscopy [1, 2]. Modern approach to generate high power THz is based on ultra-short pulse compact accelerators [3, 4] or free-electron lasers [1]. However, an optimal mechanism for THz production is still under discussion. The aim of designing of a compact and tunable THz source with short pulse dura ... More
Presented by Dr. Alexander ARYSHEV on 30 Sep 2016 at 10:30
Electrons moving above a periodic dielectric structure generate Smith-Purcell radiation (SPR). SPR may serve for noninvasive bunch diagnostics and also as a good source of THz radiation [1, 2]. In the present report we suggest using a ribbon beam in order to enhance the effective interaction between the beam and grating. In our previous works [3,4] we used the scheme with cylindrical symmetry, whe ... More
Presented by Dr. Alexey TISHCHENKO on 30 Sep 2016 at 15:45
Type: Poster Session: PS1: Poster Session
The positrons quantum channeling in carbon nanotubes by the numerical solution of the Schrödinger equation in the corresponding paraxial approximation is considered. The spatial redistribution of the positrons flux in the transverse plane during channeling in nanotubes is detected. Also the angular distribution of positrons passed through the nanotube is studied. This distribution is sensitive to ... More
Presented by Dr. Anatoly SABIROV on 26 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
Generation of electromagnetic radiation in the frequency region of terahertz (THz) has attracted ever-growing attention owing to 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 radiations (SPR). In ... More
Presented by Mr. Alexsandr PONOMARENKO on 27 Sep 2016 at 18:40
We considered coherent Cherenkov radiation (CChR) produced by a tilted bunch passing through a slit in a dielectric slab. For a chosen dielectric susceptibility ε=1.3 the resulting CChR propagates from a target bulk to vacuum at the angle θch=32.6˚. The azimuthal asymmetry in CChR angular distribution was calculated and shown that difference of yields for azimuthal angles φ=0˚ and φ=180˚ is ... More
Presented by Prof. Alexander POTYLITSYN on 30 Sep 2016 at 15:15
Type: Poster Session: PS1: Poster Session
Small-angle particle reflection at the channeling conditions appear when electron is reflected from the crystallographic planes of the crystal [1]. In this work proved existence of quantum resonances in a small-angle reflection of relativistic electrons by a crystal surface, if the crystallographic planes are parallel to a surface. Calculations were based on Kronig–Penney model of potential. We ... More
Presented by Prof. Yuri KUNASHENKO on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S1.2: Channeling & Radiations in Crystals
Processes of coherent radiation such as transition radiation, Cherenkov radiation, X-ray parametric radiation generated by «pancake-like» short electron bunches with any angle ψ between bunch axes and it’s velocity were investigated. There was shown that the angle of maximal radiation yield of transition radiation is determined by the tilt angle ψ for all cases even if such an angle is much ... More
Presented by Prof. Alexander POTYLITSYN on 26 Sep 2016 at 11:20
Type: Poster Session: PS2: Poster Session
In the report we analyze a possibility to use for a diagnostics aims the process of coherent transition radiation (CTR) produced by a train of tilted ultrashort electron bunches. Measuring spectral-angular distributions of CTR produced by such a train it is possible to determine microbunch length, bunch tilting angle, separation between bunches and modulation depth.
Presented by Prof. Alexander POTYLITSYN on 27 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
Optical transition radiation (OTR) is widely used as a tool for transverse diagnostic of electron beams in many accelerator facilities around the world. It is generated when the beam of electrons intercepts a metallic or dielectric screen. The OTR then propagates in the direction of the mirror reflection to the point where it can be detected. Despite the fact that the electron beam can be destroye ... More
Presented by Dr. Konstantin KRUCHININ on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
We report a novel method for evaluating the energy spectrum of electrons emitting hard x-rays and gamma-rays in undulators and Compton sources. The method takes into account the quantum nature of recoils undergone by the electrons emitting high energy photons. The method is susceptible to evaluate a spectrum of electrons for the whole range of the emission rates per electron-pass through the drivi ... More
Presented by Dr. Eugene BULYAK on 27 Sep 2016 at 10:30
Generation of intense THz radiation beams is important for a growing demand in research based on THz spectroscopy and imaging. Physical processes associated with the beam propagation near a grating or a system of gratings give rise to beam energy modulation as well as radiation emission based on the mechanism of Smith-Purcell radiation, with the capability to tune both processes. Devices that cont ... More
Presented by Dr. Pavel KARATAEV, Dr. Konstantin LEKOMTSEV on 30 Sep 2016 at 12:20
Type: Poster Session: PS2: Poster Session
In the charge-exchange accelerators, negatively charged accelerated ions loss their electrons in a thin charge-exchange target and become positively charged ions. In the present paper, radiation arising at charge-exchange of non-relativistic ions a thin transparent charge- exchange target is considered. The formula for spectral and angular distribution of the number of quan ... More
Presented by Dr. Alexander SHCHAGIN on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S3.1: X-Rays/Neutrons/Atoms Channeling
For many years, the optical transition radiation (OTR) was successfully applied for beam diagnostics. However, distortions of the OTR images appear at decreasing of the beam size and increasing of beam current because of diffraction and coherent effects. The influence of these effects can be suppressed using the radiation in the X-ray range. In the present paper, the possible applicati ... More
Presented by Dr. Alexander SHCHAGIN on 27 Sep 2016 at 12:05
Tsinghua Thomson Scattering X-ray Source (TTX) is the first-of-its-kind dedicated hard X-ray source in China based on the Thomson scattering between a terawatt ultrashort laser and relativistic electron beams [1]. Many improvements have been performed at the facility during the last three years since 2013, including developing a new separated Ti:Sapphire laser system for collision, 100-fs timing s ... More
Presented by Dr. Yingchao DU on 30 Sep 2016 at 12:05
Type: Poster Session: PS2: Poster Session
Properties of Vavilov-Cherenkov radiation were obtained by Frank and Tamm in classic approach. Shortly after, Ginzburg described these properties in quantum approach. Later, expressions for frequencies of coherent bremsstrahlung and parametric X-ray radiation in periodic medium were obtained by Ter-Mikaelian in classic approach neglecting transverse compo ... More
Presented by Dr. Alexander SHCHAGIN on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S1.4: Channeling & Radiations in Crystals
Now, positrons are produced in tungsten single-crystalline and amorphous targets, see, e.g., [1]. To regret, application of tungsten single-crystals is restricted because of a short dechanneling length of incident electrons. We propose to apply textured polycrystalline target for increasing of the positron production. The polycrystalline target can be produced as a set rolled tungst ... More
Presented by Dr. Alexander SHCHAGIN on 27 Sep 2016 at 17:50
ELI-NP is one of the three pillars of ELI (Extreme Light Infrastructures) European Project, to be built in Bucharest, Romania. This facility will host the Gamma Beam System (GBS), an intense and monochromatic gamma beam source based on inverse Compton interaction between a high-power laser and an accelerated electron beam produced by a warm linac. The EuroGammaS association, composed by many Europ ... More
Presented by Dr. Gianfranco PATERNò, Paolo CARDARELLI on 29 Sep 2016 at 12:50
For future high current linear lepton machines, non-invasive beam size measurement systems based on Optical Diffraction Radiation (ODR) have been the subject of extensive research in the past years. We report here the installation and commissioning of a high resolution Optical Diffraction Radiation (ODR) experiment on the KEK-ATF2 electron beam-line in Tsukuba (JP). The experimental apparatus allo ... More
Presented by Dr. Robert KIEFFER on 30 Sep 2016 at 16:00
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
Generic structure of spectra of non-dipole radiation from ultra-relativistic electrons is discussed on two examples: 1. Radiation accompanying double hard scattering of an electron with a time interval T. 2. Passage of an electron through a domain of uniform magnetic field of finite length T. In both cases, we will assume that electron deflection angles are small compared to unity, but much ... More
Presented by Dr. Micola BONDARENCO on 27 Sep 2016 at 09:45
Type: Poster Session: PS2: Poster Session
The problem of the transition radiation of multicharged ions at the interface between two media and in a thin plate under the charge-exchange conditions has been solved. It has been shown that the processes of pickup (or loss) of electrons by accelerated multicharged ions at the interface between two media significantly increases the yield of transition radiation. To observe the effects associated ... More
Presented by Mr. Vyacheslav MALYSHEVSKY on 27 Sep 2016 at 18:40
A compact accelerator facility designed to generate high-brightness electron beams is of great demand throughout a broad scientific community as it can be used to generate intense, tunable THz and X-ray radiation beams. The “Advanced Generation of THz and X-ray” (AGTaX) collaboration was created to bring together different communities working on the simulation, generation and experimental inve ... More
Presented by Dr. Alexander ARYSHEV on 30 Sep 2016 at 09:00
Type: Poster Session: PS2: Poster Session
Parametric X-ray radiation (PXR) appears during coherent scattering of the charged particle Coulomb field on the atomic structures. PXR was studied theoretically and experimentally in different geometries, in a wide range of charged particles energies and different targets (crystalline, polycrystalline and multilayer mirrors). Nevertheless, the PXR form powders is one of sufficient lacuna for cons ... More
Presented by Mr. Ramazan NAZHMUDINOV on 27 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
In the report the features of Cherenkov radiation at channeling are investigated
Presented by Prof. Vladimir VYSOTSKII on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.2: Channeling & Radiations in Various Fields
Parametric X-ray radiation (PXR) appears during coherent scattering of the charged particle Coulomb field on the atomic structures. PXR was studied theoretically and experimentally in different geometries, in a wide range of charged particles energies and several crystalline targets (crystalline, polycrystalline and multilayer mirrors). Nevertheless, the backward geometry for the PXR observation r ... More
Presented by Dr. Alexander KUBANKIN on 26 Sep 2016 at 17:50
Type: Poster Session: PS3: Poster session
Electron acceleration using short pulse high power laser is one of the scheme proposed to reduce the size of the future accelerator. Different scheme has been proposed to increase the acceleration length and the final electron energy, like use of gas filled capillary. Advance target design increases the demand on the quality of the laser beam, in particular to the pointing stability, that it is r ... More
Presented by Dr. Marco GALIMBERTI on 29 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
In the work the prperties of long-distant undamped thеhermal waves generated in pulse radiative processes are studied.
Presented by Prof. Vladimir VYSOTSKII on 27 Sep 2016 at 18:40
The Vulcan laser is a Nd:glass amplification chain that is capable of delivering up to 2.6 kJ in 8 beam lines in two target areas. Combined with 6 long pulse beams, with user selectable pulse length from 0.1ns to 8ns, short pulses are available with pulses down to 500fs using the Chirped Pulse Amplification (CPA) on two beam lines. Recently a new diagnostics system became operational, making the ... More
Presented by Dr. Marco GALIMBERTI on 29 Sep 2016 at 16:00
Type: Poster Session: PS1: Poster Session
The formation of protonium atoms at channeling of antiprotons in a hydride lithium crystal is investigated
Presented by Dr. Nikolae MAKSYUTA on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
The ionization loss of relativistic protons moving in the depleted layer of Si detector is measured for different thicknesses of the depleted layer. The thickness of Si crystal of the detector was 300 µm, the thickness of the depleted layer was driven with applied high voltage from the detector power supply and was in the region 160–300 µm. The position and the width of the Landau spectral pea ... More
Presented by Mr. Ramazan NAZHMUDINOV on 27 Sep 2016 at 15:45
For approximately the last 20 years, laser-driven acceleration of ions has inspired novel applications that can benefit from interesting ion bunch properties. Those contrast conventional (non-laser based) accelerators by extremely short pulse durations in the picosecond range [1], a broad energy spectrum (~100 %), a high peak current (~kA) and a small, micrometer source size [2]. The main focus of ... More
Presented by Mr. Florian LINDNER on 29 Sep 2016 at 15:30
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
One of the ways to describe diffraction and transition radiation (DR and TR) is the application of the boundary conditions to the solutions of Maxwell equations on the boundary of two media. It becomes evident that the boundary conditions could be satisfied only after addition to the solutions of Maxwell equations with the charge and current of the passing particle the solution of free Maxwell equ ... More
Presented by Prof. Vladislav SYSHCHENKO on 26 Sep 2016 at 15:30
Type: Poster Session: PS2: Poster Session
At the present work we consider the problem of electromagnetic radiation generated in the uniform motion of a point charge along the dielectric tube, on a small distance from the axis. At the presence of a moving charge inside the tube will be excited as the own frequencies, and all the others. The problem is solved using Maxwell's equations for the vortex and potential fields. By eliminating ... More
Presented by Dr. Gennadiy FILIPPOV, Ms. Irina LYSOVA on 27 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
Yu. A. Goponov1, M.A. Sidnin1, K. Sumitani2, Y. Takabayashi2, I.E. Vnukov1 1) Belgorod National Research University, 14 Studencheskaya str., 308007 Belgorod, Russia 2) SAGA Light Source - 8-7 Yayoigaoka, Tosu, Saga 841-0005, Japan Recently, in connection with the design of the International Linear Collider [1] and Compact Linear International Collider [2] increased interest in new methods ... More
Presented by Prof. Igor VNUKOV on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
Yu. A. Goponov, S.A. Laktionova, M.A. Sidnin, I.E. Vnukov, Belgorod National Research University, 14 Studencheskaya str., 308007 Belgorod, Russia To evaluate the previously proposed method of calculating diffracted photon yields in thin perfect crystals [1], a comparison between calculated and experimental results [2-6] in the wide energy range of electrons and photons and the two impleme ... More
Presented by Prof. Igor VNUKOV on 27 Sep 2016 at 15:30
For the creation of novel coherent sub-THz sources excited by electron beams there is a requirement to manufacture intricate periodic structures to produce and radiate electromagnetic fields. Additive manufacturing [1], or “3D printing”, is promising to be quick and cost-effective for prototyping these periodic structures. Such structures are of great interest because the application of sm ... More
Presented by Prof. Alan PHELPS on 30 Sep 2016 at 11:20
Type: Poster Session: PS2: Poster Session
Recently, in [1,2] radiation generated by the electron beam in a multilayer periodic structure was experimentally observed in the vacuum ultraviolet (VUV) range. The mechanism of this radiation is similar to the parametric X-ray radiation (PXR) of relativistic charged particles in crystals [3] This report presents the results of an experimental study of the angular distributions and spectra of VU ... More
Presented by Dr. Alexander KUBANKIN on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S1.1: Channeling & Radiations in Crystals
Peculiarities of channeling and quasi-characteristic radiation of the charged particles in the charged axes of the ionic crystals with a zinc blende structure were investigated
Presented by Dr. Nikolae MAKSYUTA on 26 Sep 2016 at 10:45
Type: Poster Session: PS3: Poster session
There are three fundamentally different mechanism of deflection of fast charged particle beam by a bent crystal. The first mechanism was proposed by E.A. Tsyganov [1], and is based on the phenomenon of planar channeling of charged particles in a bent crystal. The second, proposed by A.M. Taratin and S.A. Vorobiev [2], called the "volume reflection", is a single reflection of positive charged parti ... More
Presented by Mr. Oleksiy FOMIN on 29 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
The problem of ionization energy loss of high-energy electron-positron pair in thin layer of substance is considered. It is assumed that the thin layer is situated in vacuum in the direction of the pair motion on some distance from the substance in which the pair is created. It is shown that in this case the approximation of parallel electron and positron velocities, which is usually used for calc ... More
Presented by Dr. Sergii TROFYMENKO on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
The present work deals with the problem of transition radiation characteristics measurement in the prewave zone. We consider backward millimeter wavelength transition radiation generated by ultrarelativistic electron during its traversal of thin metallic plate in vacuum. In [1] it was shown that the use of large (much larger than effective transverse size L of electron’s coulomb field at conside ... More
Presented by Sergii TROFYMENKO on 26 Sep 2016 at 15:00
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
Early it was found the significant change in the size of the projectile’s wave packet correlation length during the initial short time after penetration in the volume of a solid. Because the correlation length becomes much less compared to the initial size of the packet, suppose that after the penetration in the solid the projectile appears in one of spatially localized states with the central m ... More
Presented by Dr. Gennadiy FILIPPOV on 27 Sep 2016 at 16:00
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
This presentation will review work conducted at CIBA, at the National University of Singapore on MeV ion channeling analysis using a focused beam and the Interplay between ion optics and ion channeling to develop new modes of imaging, analysis and beam alignment. MeV ion channeling is well-established in using broad, unfocused beam in conjunction with analytical techniques such RBS to study crysta ... More
Presented by Prof. Mark BREESE on 27 Sep 2016 at 14:30
Techniques used at the Sensor and Semiconductor Laboratory of Ferrara for producing strip crystals exploiting anticlastic curvature were recently enhanced by introducing the Magnetorheological Finishing to obtain crystals with ultraflat surface and miscut very close to zero. New materials were employed to realize the holders to fulfill compatibility constraints with the ultra-high vacuum of the LH ... More
Presented by Dr. Giacomo GERMOGLI, Dr. Andrea MAZZOLARI on 28 Sep 2016 at 12:50
Type: Poster Session: PS3: Poster session
Channeling of low energy atomic particles in carbon naotubes is interesting for low energy ion implantation, local ion plasma enhanced deposition, chemicaly-biological and medical atomic particles transport application [1]. Carbon nanotubes sre useful as ion beam management system parts. Temperature variating along the nanotube production process allow us to variate CNT diameter, which creates nan ... More
Presented by Dr. Gennadiy FILIPPOV on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.2: Channeling & Radiations in Various Fields
Various cosmic ray experiments and experiments on modern and future accelerators face the challenge to identify particles with gamma-factors up to ~10^5. For example, widely used transition radiation detectors are good for separation of electrons from the hadron background up to hadron Lorentz-factors of about 500. For higher Lorentz-factor the contribution of transition radiation from hadrons bec ... More
Presented by Dr. Alexey TISHCHENKO on 26 Sep 2016 at 16:50
Type: Poster Session: PS2: Poster Session
The radiation in stack of the two plates of the electron bunch, microbunched in SASE FEL process, was investigated. Frequency-angular distribution of the radiation consists of two factors: the bunch form-factor around the resonant frequency and the radiation distribution formed by the passage of a single electron through a stack of plates. The region of radiated frequencies l both above and below ... More
Presented by Mr. Hayk GEVORGYAN on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
The account of polarization of the nanotube medium imposes a limit on the energy of the bunch for the generation of channeling radiation of positrons. The larger the amplitude of the harmonic oscillation of the positron in nanotube, the greater the threshold value of the energy. When the energy of the bunch is equal to the upper threshold, all positrons of bunch contribute to the radiation. As a r ... More
Presented by Mr. Koryun GEVORGYAN on 27 Sep 2016 at 15:00
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
In the present work, diffracted transition radiation (DTR) of the beam of relativistic electron crossing a thin single-crystal plate. The expression for the DTR angular density has been derived for the case when the path of the electrons in the target considerably less than extinction length. For the first time the kinematic character of DTR of the beam of ultra-relativistic electrons crossing a t ... More
Presented by Prof. Sergey BLAZHEVICH on 27 Sep 2016 at 15:15
Type: Poster Session: PS2: Poster Session
The dynamic theory of coherent X-ray radiation generated by a beam of relativistic electrons in three-layer structure consisted of amorphous layer, vacuum (air) layer and a single crystal has been developed. The expressions for spectral-angular density of diffracted transition radiation (DTR), parametric X-ray radiation (PXR) and their interference term have been derived within the framework of tw ... More
Presented by Prof. Anton NOSKOV on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S3.1: X-Rays/Neutrons/Atoms Channeling
Capillary optics is a basic X-ray technology capable to deliver a high flux density within a sub-micrometer spot. This compact optics could be easily used both to guide and to shape an intense X-ray beam within a small spot, a low divergence and with a high homogeneity. Arrays of curved tapered capillaries (polycapillary optics) can be used to focus, collimate, and filter x-ray radiation [1]. In a ... More
Presented by Augusto MARCELLI on 27 Sep 2016 at 12:20
A fundamental aspect of a successful physics experiment is the availability of a reliable and precise simulation code. In particular, Geant4 has seen a large expansion of its user community in recent years. Currently, the toolkit does not allow the simulation of particles interacting with other than amorphous states of matter. The GECO project is devoted to the development a general framework for ... More
Presented by Enrico BAGLI on 29 Sep 2016 at 11:20
Type: Oral presentation Session: S1.4: Channeling & Radiations in Crystals
At passing of charged high energy particles through crystal the phenomenon of channeling is possible, at which the particles move inside channels created by strings of crystal atoms or by crystal planes, by periodically deviating from the channel direction to small angles. In ultrathin crystals the phenomenon of channeling is absent, although there remains the possibility of manifestation of diffe ... More
Presented by Prof. Mykola SHUL'GA on 27 Sep 2016 at 16:50
Type: Poster Session: PS1: Poster Session
Nanoclusters on surfaces are interesting for a wide range of chemical, magnetic, electronic and optical properties. Bimetallic particles can be produced displaying either core-shell structures or forming alloys with, eventually, a segregated surface. The possibilities of synthesis outside equilibrium conditions widely increase the range of possible cluster composition and structure. Such particles ... More
Presented by Prof. Akbarali RASULOV on 26 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
By means of program GEANT4 the research of possibility obtaining low energy neutron beams was performed. To get the neutron flux 18 MeV external proton beam from cyclotron C18/18 is planned. As a source of neutron flux is planned proton induced reactions on 9Be target. The neutron yield dependence on the thickness of beryllium target was investigated. The problems of reducing the ratio of gamma an ... More
Presented by Mr. Vaghan IVANYAN on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S1.4: Channeling & Radiations in Crystals
The advantages of the hybrid positron source using channeling radiation, related to the yield, the converter heating and the Peak Energy Deposited Density (PEDD) in the converter , made it to be chosen as the baseline for CLIC. An optimization study concerning the positron converter –a granular target made of small tungsten spheres- has been worked out. The simulation results show that the ener ... More
Presented by Dr. Robert CHEHAB on 27 Sep 2016 at 17:35
Compton back-scattering has been demonstrated to provide compact, highly tunable, versatile and not expensive sources of X-gamma rays. New possibilities of improving the performances of the Compton sources are discussed. One of the methods for increasing the spectral density is based on the chirp of the laser. In this way, the oscillations and the broadening of the spectrum occurring in non ... More
Presented by Vittoria PETRILLO on 29 Sep 2016 at 14:30
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
The work is held to investigation of alcohol solvent role in the mechanism of electrochemical films formation on the transition metals. Photoelectric polarization data in situ allowed to find that structure and mechanism of the surface layer growth is determined by donor-acceptor interaction between d-metals surface states and dipoles of solvent. They are associated to neutral adsorption-electroch ... More
Presented by Prof. Angelina POPOVA on 26 Sep 2016 at 16:15
Type: Poster Session: PS3: Poster session
In order to gain control over hard X-ray (over 30 keV), X-ray diffraction in Laue geometry (over 30 keV) from a single crystal of quartz influenced by the temperature gradient has been considered. It has been experimentally proved that the intensity of the reflected beam can be increased up to several orders if the X-ray energies are 30 keV and 40 keV for reflecting atomic planes (10-11) depending ... More
Presented by Dr. Vahan KOCHARYAN on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
The classical amplitude of the radiation by a charged particle in non-uniform motion is usually derived from the Lienard-Wiechert retarded potential. It can be derived in a simpler way using the concept of classical simulated emission.
Presented by Mr. Xavier ARTRU on 27 Sep 2016 at 09:30
Thermal vibrations of neighboring atoms are correlated : long wavelength phonons make them displace in the same direction. For channeled particle the correlated displacements make dechanneling faster. For channeled electrons or positrons, it increases the coherence of bremsstrahlung over consecutive atoms, making a kind of semi-coherent contribution to bremsstrahlung . These effects are studied i ... More
Presented by Mr. Xavier ARTRU on 26 Sep 2016 at 09:30
Type: Poster Session: PS1: Poster Session
Radiation spectra of electrons with the energy 200 MeV in diamond crystal at axial orientation V.B.Ganenko1, D.D.Burdeyniy1, V.I.Truten1, N.F.Shulga1,2, K.Fissum3, J.Brudvik4, K.Hansen4, L.Isaksson3, K.Livingston5, M.Lundin4, B.Nilsson4, B.Schroder3,4 1 Kharkov Institute of Physics and Technology, Kharkov UA61108, Ukraine 2 Karazin Kharkov National University, Kharkov UA61022, Ukraine 3 ... More
Type: Oral presentation Session: S4.1: Charged Beams Shaping
The use of polarized nuclei as a fuel for thermonuclear fusion reactors was suggested more than 30 years ago and discussed in detail in a series of seminal papers [1-4]. For magnetic confinement as well as for inertial fusion the total cross section can be increased significantly. Especially for the dominant nuclear fusion reactions 2H + 3H →4He+n + 17.58 MeV and 2H +3He→4He+p + 18.34 MeV, an ... More
Presented by Sergio BARTALUCCI on 28 Sep 2016 at 10:30
Type: Oral presentation Session: S1.1: Channeling & Radiations in Crystals
At motion of accelerated charged particle through crystal the phenomenon of plane channeling is possible, at which the particle performs oscillatory motion in the channel formed by crystal planes. In ultrathin crystals such regime fails to be established, and a problem appears on the properties of motion and scattering of particles in this case. For MeV electrons such a transitional motion regime ... More
Presented by Dr. Sergiy SHULGA on 26 Sep 2016 at 10:15
Type: Poster Session: PS3: Poster session
Spiral Scattering of Relativistic Particles in a Bent Crystal G.V. Kovalev School of Mathematics, University of Minnesota, Minneapolis, MN 55455,USA The spiral scattering of charged particle occurs due to the appearance of a negative logarithmic singularity of the classical deflection function χ(b) of a particle for a certain impact parameter b = bs[1,2]. Resonance scattering [3] is a quant ... More
Presented by Dr. Gennady KOVALEV on 29 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
High Energy Microbeams and Focusing Limits of Channeling Particles G.V. Kovalev School of Mathematics, University of Minnesota, Minneapolis, MN 55455,USA The possibility of beam steering of high energy particles by a crystal has been investigated for a long time. Tsyganov was the first who proposed the bent crystal channeling. After the successful demonstration of the bent channeling[2], it ... More
Presented by Dr. Gennady KOVALEV on 29 Sep 2016 at 18:40
The theory of the generation of the single-particle and collective excitations in a crystal by a fast charged quantum oriented relative to the crystallographic axes particle is constructed. The dependence of the intensity of the generation of excitations in the crystal depending on the level of the transversal both sub barrier and over barrier movement is obtained. It is shown that the loss of ... More
Presented by Prof. Nikolay KUDRYASHOV on 30 Sep 2016 at 16:15
Type: Poster Session: PS2: Poster Session
The presented results of model numerical calculations indicate that at the ionization with a strong shock wave travelling at supersonic speed, the air must «glow» with low frequency electromagnetic radiation (1-2 MHz), just as the solar wind generates the aurora borealis as a result of interaction with the magnetic field of the Earth. The results of ground-based observations of the process of ... More
Presented by Dr. Artur ARAMYAN on 27 Sep 2016 at 18:40
Relativistic particle interaction with oriented crystals combines both classical and quantum features. Coherent particle scattering is described by the average (Lindhard) potential of planes and strings while quantum treatment is necessary to describe the incoherent scattering by both electrons and atomic cores. The latter has to be separated into large-angle single and small-angle multiple scatte ... More
Presented by Alexei SYTOV on 29 Sep 2016 at 11:50
The channeling phenomena were modeled using the supplementary Geant4 library TPT-EM. It the model the incident deuterons were captured it the crystallographic channel by Ti-plane potentials. The height of the plane potential has been calculated according to the Linchard theory. The experimental effect of the 20 percent neutron yield enhancement in the energy range 7-12 keV was fit by the model wi ... More
Presented by Mr. Dmitry SOROKIN on 29 Sep 2016 at 10:30
Type: Oral presentation Session: Channeling Primer
After 15 years in construction and 4 years of operation, the LHC has now achieved its design luminosity. It is without doubt the most complex scientific instrument ever built, bringing together science and engineering on a grand scale. The 6000 superconducting magnets weighing nearly 50000 tons in total are cooled with 100 tons of superfluid helium. In this seminar, some of the unique design featu ... More
Presented by Dr. Lyn EVANS
Type: Oral presentation Session: S3.1: X-Rays/Neutrons/Atoms Channeling
Polycapillary x-ray optics are a powerful tool to focus x-ray radiation in order to achieve small spot sizes of about ~10 µm. Especially the capability to focus radiation in a broad energy range (5-30 keV) shows polycapillary x-ray optics to be without an alternative for compact table-top EDXRF spectrometers. Since their invention in the early 1990s, a lot of developments were made and many chara ... More
Presented by Mr. Marcel BREMEKAMP on 27 Sep 2016 at 12:35
Type: Poster Session: PS3: Poster session
Dynamics of the Relativistic Particles and Conformal Mapping of the Crystal G.V. Kovalev School of Mathematics, University of Minnesota, Minneapolis, MN 55455,USA The dynamics of relativistic particles is depended on the shape of the crystals and beam optics. The bending of the crystal is possible in many ways. One of the most powerful and natural way to find the needed bent is the using the ... More
Presented by Dr. Gennady KOVALEV on 29 Sep 2016 at 18:40
Type: Poster
Crystalline undulator radiation (CUR) is formed by a planar-channeled relativistic positron between periodically curved crystallographic planes [1, 2]. Both amplitude and spatial period of crystalline undulator are much larger than amplitude and a spatial period of the positron oscillation [3]. Taking into account availability of medium polarization, the spontaneous CUR has an energy threshold as ... More
Presented by Prof. Lekdar GEVORGIAN
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
The propagation of a photon is investigating in a constant and uniform electric field at any photon energy. The investigation is based on the polarization operator of a photon in an electromagnetic field [1]. The imaginary part of the polarization tensor eigenvalues gives the partial contribution to the probability of electron-positron pair creation and defines the photon lifetime. The real pa ... More
Presented by Prof. Valeriy KATKOV on 27 Sep 2016 at 10:15
Type: Oral presentation Session: S5.2: Novel sources: FEL/Laser/Plasma channels
The power enhancement by an optical resonant cavity is a novel method to achieve intense laser pulses for laser Compton scattering, however, it requires high precision control of the optical path to keep it on the resonance. We have beeｎ developing a new scheme to avoid this difficulty using a feedback free optical cavity with self-reconating scheme. In this talk, we report the status of the ... More
Presented by Tohru TAKAHASHI on 29 Sep 2016 at 17:35
Type: Poster Session: PS2: Poster Session
The diffraction of thermal neutrons on x-cut quartz crystal for the symmetric Laue geometry under the action of a temperature gradient perpendicular to the reflecting atomic planes (101 ̅1) was theoretically considered. The controllability of a neutron beam in space and time is analyzed and its parameters are estimated (relative maximum intensity, the angular and energy distribution of obtained b ... More
Presented by Mr. Artur MOVSISYAN on 27 Sep 2016 at 18:40
This paper reports the results of an experimental investigation to characterize the inner structure of a high-pressure gasoline spray injected by a 6-hole nozzle for Direct Injection Spark Ignition (DISI) engines. A desktop facility based on polycapillary optics system, providing a high flux beam with low divergence has been used. Both x-ray µ-tomography and radiography techniques have been appli ... More
Presented by Luca MARCHITTO on 29 Sep 2016 at 12:35
An algorithm for the numerical calculation of the radiation spectrum based on the direct integration of the Baier Katkov (BK) formula is introduced. Since the coherent effects in the process of radiation emission in crystals appear when the angle between particle trajectories and crystal planes or axes is small and at ultra-relativistic energies the radiation angle 1/gamma is much smaller than u ... More
Presented by LAURA BANDIERA on 29 Sep 2016 at 09:30
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
The Fermilab Accelerator Technology & Science (FAST) facility currently under commissioning couples a high-brightness electron source with a superconducting linear accelerator (linac) and compact storage ring. The infrastructure is expected to provide a testbed for Accelerator Science and Beam Physics. An active area of research regards the production of X-ray and gamma-ray radiation via respectiv ... More
Presented by Philippe PIOT on 27 Sep 2016 at 09:00
Type: Poster Session: PS3: Poster session
A high-brilliance ($>10^{20}$ phot.s$^{-1}$.mm$^{-2}$.mrd$^{-2}$/0.1%) gamma-ray source experiment is currently in preparation at Fermilab ($E_\gamma\simeq 1.1$~MeV). The source implements a high-repetition-rate inverse Compton scattering by colliding electron bunches formed in a 300-MeV superconducting linac with a high-intensity laser pulse. This contribution describes the design rationale alon ... More
Presented by Philippe PIOT on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S1.2: Channeling & Radiations in Crystals
Channeling radiation produced from field-emitted electron bunches accelerated in a compact high-duty cycle accelerator could lead to the development of laser-free rugged X-ray sources [C. A. Brau, et al., Synchrotron Radiation News, 25, Issue 1 (2012)]. This type of source could have application in a variety of domains including in medical imaging and industry. In this paper we present our progres ... More
Presented by Philippe PIOT on 26 Sep 2016 at 12:20
Charged particles channeling in laser channels could be used for particle beams cooling, steering and shaping and has some benefits comparing to e.g. crystal channeling. As charged particle beams become more intense, influence of space charge effect on their dynamics is increasing and needs to be taken into account. To examine this phenomena numerically a simulation code taking into account part ... More
Presented by Mr. Evgenii FROLOV on 29 Sep 2016 at 10:00
Type: Poster Session: PS2: Poster Session
The process of charged particles channeling through potential channels formed by crossed laser beams is described using classical approach and covering the effect of charged particles radiative deceleration in such channels. The way to increase charged particle beam cooling efficiency is present.
Presented by Dr. Alexey DIK on 27 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
The interaction of a charged particle with a curved inner surface of a capillary and influence of its curvature on the process of particle deflection are analyzed. The results were obtained using perturbation theory.
Presented by Mrs. Ekaterina DIK on 29 Sep 2016 at 18:40
The main interest in the aneutronic nuclear fusion reactions for energy production concerns the possibility of greatly reducing the problems associated with neutron activation and related requirements for biological shielding, remote handling, and safety. Among the so called “advanced fusion fuels” the proton-Boron fusion reaction seems to be the most attainable from an experimental point of v ... More
Presented by Prof. Danilo GIULIETTI on 29 Sep 2016 at 15:45
Type: Poster Session: PS2: Poster Session
The undulator radiation theory of channeling positrons in the crystalline undulator (CU), which consists of a bent single crystals, separated by intervals, was developed. The calculation formula for the frequency distribution of the radiation formed in CU with intervals was received in [1]. It is shown that undulator radiation may be intensified by the presence of intervals. In this paper, an ana ... More
Presented by Dr. Anahit SHAMAMYAN, Prof. Lekdar GEVORGIAN on 27 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
Advanced computer technology and wide use of personal computers today open up great perspectives of computer simulations for studying various processes and phenomena of the surrounding world. Computer models are often used to obtain new data about simulated object or for approximate estimation of the system behaviour while this system is too complex for analytical exploration. Consistency of compu ... More
Presented by Egor KURNIKOV on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S3.1: X-Rays/Neutrons/Atoms Channeling
Kouichi Tsuji, Shota Aida, and Yuki Takimoto Graduate School of Engineering, Osaka City University (OCU), 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan A non-destructive elemental imaging is important for environmental, forensic, and material sciences. We will introduce a few approaches for x-ray elemental and chemical imaging in the laboratory at OCU. The drawback of the scann ... More
Presented by Prof. Kouichi TSUJI on 27 Sep 2016 at 11:20
The motion of a charged particle in a one-dimensional periodic potential of the Kronig-Penney type is considered. The energy band structure, Bloch wave functions in coordinate and momentum representation are investigated in detail. Two sharply distinguished groups of states, i.e. below-barrier and above-barrier, are extracted and the role of both of them in the channeling of positively and negativ ... More
Presented by Dr. Erine BABAKHANYAN on 26 Sep 2016 at 18:40
The SPARC_LAB Thomson source is a compact X-ray source based on the Thomson backscattering process. The electron beam energy ranges between 30 and 150 MeV, the electrons collide head-on with the Ti:Sapphire FLAME laser pulse the energy of which ranges between 1 and 5 J with pulse lengths in the 25 fs–10 ps range, providing an X-ray energy tunability in the range of 20–500 keV. After the second ... More
Presented by Cristina VACCAREZZA on 29 Sep 2016 at 17:20
The emission of characteristic lines after x-ray excitation is usually explained as the consequence of two independent and consecutive physical processes: the photoelectric ionization produced by the incoming photons and the successive spontaneous atomic relaxation. However, this is not the only mechanism for the formation of the characteristic lines. In first place, the photoelectric effect is no ... More
Presented by Prof. Jorge Eduardo FERNANDEZ on 29 Sep 2016 at 12:20
Type: Oral presentation Session: S4.1: Charged Beams Shaping
Chemical energy—oil and gas—will run out in the next 30–50 years. In addition to drying out our chemical energy sources, there is the so-called greenhouse effect, which imposes severe restrictions on the use of fuel. Nuclear reactors use uranium and thorium, and their reserves will last for no more than 100–200 years. Cold nuclear fusion in metals is possible due to the fact that the imp ... More
Presented by edward TSYGANOV on 28 Sep 2016 at 10:15
The SPARC_LAB test facility hosts a 150 MeV high brightness electron beam injector, which drives a FEL source, a THz radiation user beam line and an X-ray Thomson backscattering experiment. A particle driven plasma acceleration (PWFA) experiment is also under way. In parallel to that a 200 TW laser is linked to the linac and is devoted to explore laser-matter interaction, in particular with regard ... More
Presented by Massimo FERRARIO on 29 Sep 2016 at 16:50
The multi-purpose computer package MBN (Meso-Bio-Nano) Explorer that is being developed by MBN Research Center allows modeling of molecular systems of varied level of complexity with the sizes ranging from the atomic to the mesoscopic scales. It is suited to optimize the structure of a system as well as to run MD simulations. In specific application to the channeling phenomenon, the package allows ... More
Presented by Prof. Andrey SOLOV'YOV on 29 Sep 2016 at 09:00
Type: Poster Session: PS3: Poster session
SIDDHARTA-2 aims to perform the first measurement of the kaonic deuterium transitions, which, combined with the result on kaonic hydrogen, will deliver the isospin-dependent kaon-nucleon scattering lengths, fundamental to low-energy QCD. A related experiment, using the new Transition Edge detectors has been successively proposed, for accurate determination of the controversial k- mass and for meas ... More
Presented by Mihail Antoniu ILIESCU on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S1.4: Channeling & Radiations in Crystals
The calculation of the quasi-Bloch energy spectrum of the oriented fast charged particle entering the crystal at an angle substantially greater than the Lindhard angle is performed. It is shown that the band structure with the presence of allowed and forbidden bands completely preserved during the passage of fast charged particles high above the crystal potential. The processes of the photon gener ... More
Presented by Dr. Evgeny MAZUR on 27 Sep 2016 at 18:20
Type: Poster Session: PS3: Poster session
Polycapillary optics is a well known technology used within different research and industrial fields. Generally these devices are applied for their integral properties, as flux gain factor, or for the micro- focus features useful for confocal geometry. Less investigations have been spent about composition of the trasmitted beam. In this work features about spot size, energy composition, residual ... More
Presented by Andrea LIEDL on 29 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
The results of numerical analysis of angular distribution of the radiation of an electron moving on a plane along a circle arc are presented. The numerical values of global extremum of the sigma and pi-components of the linear polarization are determined. The analysis has shown that there are invariant directions where there is always the maximum (minimum) value of the radiation power.
Presented by Prof. Vyacheslav TLYACHEV on 27 Sep 2016 at 18:40
The compact Compton ring ThomX is now under construction at LAL/Orsay. This machine will provide a quasi-monochromatic X-ray beam of multi keV energy. However major issues are expected in beam dynamics and on the operation of the laser system. In this presentation, the machine design, including the optical and laser systems will be reviewed. Recent progress in the optical system performances wil ... More
Presented by Prof. Fabian ZOMER on 29 Sep 2016 at 15:00
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
Simulations were performed to calculate beam deflection of planar-channeled protons and carbon ions by bent crystals, in the energy range of a few hundreds of MeV/u. With only weekly relativistic particles, deflection angles may reach 10° and above for particles surviving channeling conditions.
Presented by Dr. Denis DAUVERGNE on 26 Sep 2016 at 14:30
Type: Poster Session: PS3: Poster session
In this report we present experimental investigation of interaction of the electromagnetic field of a relativistic bunched electron beam with a metamaterial. Used metamaterial target represents a right triangular prism. The unit cell of the target consists of a split-ring resonator (SRR) and a wire. The size of the unit cell is 3 mm. The measurements were done in millimeter wavelength range in far ... More
Presented by Ms. Veronika SOBOLEVA on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S4.1: Charged Beams Shaping
Since 2013, several key experiments have been performed at SLAC investigating channeling of positrons and electrons in bent crystals, the latter in an energy range from 3 to 20 GeV, using the FACET and the ESTB beam facilities. Using a Ferrara-made bent Si (110) crystal these experiments have measured channeling parameters in a little-explored energy range and have investigated the quasi-channelin ... More
Presented by Dr. H.-Ulrich (Uli) WIENANDS on 28 Sep 2016 at 09:00
Type: Oral presentation Session: S3.1: X-Rays/Neutrons/Atoms Channeling
"Rainbow X-Ray" (RXR) is a μXRF station at "XLab-Frascati", now open for users and optimized for any kind of analytical research field using X-ray sources. In collaboration with two archeological groups (site "Grotta Romanelli" - Late Pleis- tocene, and site "Gran Carro" - Iron Age) we are starting X-ray Fluorescence studies on local artifacts. The elemental analysis of these artifacts (in parti ... More
Presented by Dariush HAMPAI on 27 Sep 2016 at 11:50
Type: Poster Session: PS2: Poster Session
This study provides insight into the performance of the capillary system, as well as getting a qualitative picture of X beam redistributions while passing through these structures that becomes important for definition of optimal parameters of capillary structures specially designed.
Presented by Mr. Aleksandr BARYSHNIKOV on 27 Sep 2016 at 18:40
Presented by Sultan DABAGOV, Luigi PALUMBO, FRANK ZIMMERMANN on 25 Sep 2016 at 14:00
The plasma wake-field acceleration (PWFA) is the promising type of acceleration, that recently had shown not only ability to produce a high energy beams at short distance, but also increasing quality of the beam in terms of energy spread, emittance and stability. Increasing quality of the PWFA beams opes for us an opportunity to create a compact FEL type sources of radiation. In this work we studi ... More
Presented by Vladimir SHPAKOV on 29 Sep 2016 at 18:05
on 25 Sep 2016 at 14:10
Type: Oral presentation Session: Channeling Primer
Practically 50 years past since the phenomenology for charged particles channeling in crystals has been proposed by Lindhard. This pioneering work that provides correct description of charged particles motion in oriented crystals at small beam incident angle with respect to main crystallographic directions, resulting in either planar or axial channeling, was followed by many research papers, revi ... More
Presented by Prof. Joseph REMILLIEUX, Prof. Sultan DABAGOV on 25 Sep 2016 at 15:50
Type: Oral presentation Session: Channeling Primer
MEPhI was founded during World War II in 23 November, 1942 initially as Moscow Mechanical Institute of Ammunition by I.Stalin’s personal order. The main goal of its foundation was to collect brilliant minds together, train them and urgently start research in creation of nuclear weapon. Since the end of 50-th the main goal of Moscow Engineering Physics Institute is the people ware for developing ... More
Presented by Prof. Nikolay KALASHNIKOV
Type: Oral presentation Session: Channeling Primer
Maykop State Technological University (RF, Adygheya, Maykop)
Presented by Prof. Saida KUIZHEVA on 25 Sep 2016 at 16:50
Type: Oral presentation Session: Channeling Primer
MEPhI was founded during World War II in 23 November, 1942 initially as Moscow Mechanical Institute of Ammunition by I.Stalin’s personal order. The main goal of its foundation was to collect brilliant minds together, train them and urgently start research in creation of nuclear weapon. Since the end of 50-th the main goal of Moscow Engineering Physics Institute is the people ware for developing ... More
Presented by Prof. Nikolay KALASHNIKOV on 25 Sep 2016 at 16:20
Type: Oral presentation Session: Channeling Primer
President of INFN Prof. Fernando Ferroni will greet the participants of Channeling 2016
Presented by Prof. Fernando FERRONI on 25 Sep 2016 at 14:25
Type: Oral presentation Session: Channeling Primer
Lessons learned from LHC allow the definition of new strategies for future collider concepts
Presented by FRANK ZIMMERMANN on 25 Sep 2016 at 14:40
The betatron radiation from electrons accelerated in laser-produced plasma channels typically extends in the X-ray region, with a broad synchrotron-like incoherent spectrum. Nevertheless the radiation spectrum and the degree of coherence of the betatron radiation can be efficiently modified according to different laser-plasma interaction schemes. The betatron radiation seems to be a good can ... More
Presented by Alessandro CURCIO on 29 Sep 2016 at 18:20
The ordered positions of atoms in crystals give a reason to study multiple scattering of high energy charged particles within them. In addition, the accurate representation of multiple scattering of high-energy protons in a bent crystal is important for studies of crystal assisted collimation at the SPS and the LHC. Multiple scattering of 400 GeV/c protons in bent silicon crystals was measured for ... More
Presented by Dr. Alexander TARATIN on 28 Sep 2016 at 12:20
Type: Poster Session: PS3: Poster session
Charged particles under over-barrier states but still close to channeling conditions experience transverse oscillations named quasichanneling oscillations. We demonstrate both theoretically and by Monte Carlo simulations that such kind of oscillations can be directly observed in the deflection angle distribution behind a bent crystal for both positively and negatively charged particles. We pro ... More
Presented by Alexei SYTOV on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
Parametric X-ray radiation generated by relativistic electrons in crystals and polycrystals with different quality of grain structures is studied experimentally. The obtained results are compared with the existing PXR theories for crystalline [1] and polycrystalline structures [2]. A deviation between the existing theories and measurements is observed for textured polycrystals which can be conside ... More
Presented by Esteban IRRIBARRA on 26 Sep 2016 at 15:15
Type: Poster Session: PS1: Poster Session
The presence of structural defects in a crystal strongly affects the orientational coherent effects of high-energy charged particles. Indeed, the trajectories of charged particles may be abruptly modified by a dislocation or a stacking-fault, causing the particle to dechannel. Two strips, a bent SiGe strip and a bent lithium niobate strip, were exposed to a 400 GeV/c proton beam at the ... More
Presented by Enrico BAGLI on 26 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
The crystal-based collimation system is a potentially efficient solution for the collider beam halo collimation problem. However it is not free from the leakage from secondary collimators and incoherent nuclear scattering in crystal primary collimators, mainly connected with dechanneling process. To solve this problem, we propose here a double crystal-based collimation system, with the second c ... More
Presented by Alexei SYTOV on 29 Sep 2016 at 18:40
Channeling of 10 MeV protons in radially compressed chiral carbon nanotubes is considered. Monte Carlo simulation program is used for the calculation of the trajectories, energy losses and angular distributions of protons in nanotubes of various lengths and compression, where the potential in Doyle-Turner approximation is used to describe the interaction between a proton and a nanotube. Carbon nan ... More
Presented by Dr. Stylianos SARROS on 29 Sep 2016 at 12:05
Type: Oral presentation Session: S2.2: Channeling & Radiations in Various Fields
We investigate the spectral-angular distribution for the radiation emitted by a point charge rotating inside a cylindrical grating with conducting strips. Two types of the radiation processes are realized: synchrotron and Smith-Purcell radiations. Their relative contributions to the total radiation intensity are discussed in various asymptotic regions of the parameters describing the diffraction g ... More
Presented by Ms. Anna KOTANJYAN on 26 Sep 2016 at 18:05
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
A theoretical and phenomenological consideration is given to higher order, strong field effects in electron/laser interactions. A consistent strong field theory is the Furry interaction picture of quantum field theory [1,2]. In this theory, fermions are embedded in the strong laser field and the Volkov wavefunction solutions that result, are exact with respect to the strong field [3,4]. When these ... More
Presented by Anthony HARTIN on 27 Sep 2016 at 10:00
Type: Oral presentation Session: S1.1: Channeling & Radiations in Crystals
The phenomena of spin rotation and depolarization of high-energy particles in crystals in the range of high energies that will be available at Future Circular Collider (FCC) can be used to measure the anomalous magnetic moments of short-lived particles. We demonstrate that the phenomenon of particle spin depolarization in crystals provides a unique possibility of measuring the anomalous magnetic m ... More
Presented by Prof. Vladimir BARYSHEVSKY on 26 Sep 2016 at 09:00
Type: Poster Session: PS1: Poster Session
Stimulated Resonance Radiation of Channeling Particles 1,2,3 Dabagov S.B., 2 Kalashnikov N.P. 1 Laboratori Nazionale di Frascati, Istituto Nazionale di Fisica Nucleare, Italy. 2 National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia. 3 RAS, P.N. Lebedev Physical Institute, Moscow, Russia Abstract. The motion of channeling particles ... More
Presented by Prof. Nikolay KALASHNIKOV, Sultan DABAGOV on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
Raman Scattering of Photons by the Channeling Electrons Badreeva D.〖R.〗^1, Kalashnikov N.〖P.〗^1 1 National Research Nuclear University MEPhI, Moscow, Russia dinkulenok@yandex.ru; kalash@mephi.ru Abstract. The motion of channeling particles in the accompanying coordinate system can be considered as a two-dimensional atom in the case of axial channeling. The transversal motion of t ... More
Presented by Prof. Nikolay KALASHNIKOV on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S1.2: Channeling & Radiations in Crystals
Induced Resonance Evolution of the channeling electron beam V.V. Ambartsumov1, N.P. Kalashnikov1 1 National Research Nuclear University MEPhI (Moscow Engineering Physics Institute). e-mail: vazgen993@yandex.ru; kalash@mephi.ru Abstract. The motion of channeling particles in the accompanying coordinate system can be considered as one-dimensional oscillator (in the case of planar channeli ... More
Presented by Prof. Nikolay KALASHNIKOV on 26 Sep 2016 at 12:35
Type: Poster Session: PS2: Poster Session
The dielectric fibers are widely used in technique for light transport and as the beam loss position monitor in particle accelerators. This work reports the results of the experimental investigations of polarisation radiation properties in the dielectric fibers for different fiber positions relative to an electron beam. The experimental results show that we can use fibers for non-invasive beam pos ... More
Presented by Mr. Vitold BLEKO, Dr. Gennady NAUMENKO on 27 Sep 2016 at 18:40
Type: Oral presentation Session: S1.3: Channeling & Radiations in Crystals
The spectroscopy of charmonium-like states together with the spectroscopy of charmed and strange baryons is discussed. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models [1, 2, 3]. An understanding of the baryon spectrum is one of the primary goals of non-perturb ... More
Presented by Dr. Mikhail BARABANOV on 27 Sep 2016 at 16:15
We present the design of a photon-photon collider based on Compton gamma sources for the observation of elastic γγ scattering. Two symmetric relativistic electron beams produce two primary gamma rays through Compton back scattering with two high energy lasers. The elastic photon-photon scattering is analysed by start-to-end simulations from the photocathodes to the detector. A new Monte Carl ... More
Presented by Illya DREBOT on 29 Sep 2016 at 17:50
Type: Poster Session: PS3: Poster session
We discuss the possibility to generate low emittance muon beams by colliding high energy hadrons and counterpropagating high brilliance photon pulses. The asymmetric collision of Large Hadron Collider/Future Circular Collider like hadrons and FEL keV photons imparts a strong Lorentz boost to the secondary particles which are emitted at hundreds GeV energy within a small angle around the hadron be ... More
Presented by Camilla CURATOLO on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S4.1: Charged Beams Shaping
The Interaction of the Ion and X-ray Beams with Energies Less than 30 keV with Deuterated Crystal Structures A.V. Bagulya1, O. D. Dalkarov1, M. A. Negodaev1, A. S. Rusetskii1, V.I.Tsekhosh1, A.A. Bolotokov2 1 P. N. Lebedev Physical Institute of Russian Academy of Sciences (LPI), 119991 Moscow, Russia 2 Corporation " Radium", 125057, Moscow, Russia At the ion accelerator HELIS [1,2] at th ... More
Presented by Dr. Mikhail NEGODAEV on 28 Sep 2016 at 10:45
Type: Oral presentation Session: S3.1: X-Rays/Neutrons/Atoms Channeling
The X-ray source based on parametric X-ray radiation (PXR) has been regularly providing a coherent X-ray beam for application studies at Nihon University. Recently, three dimensional (3D) computed tomography (CT) is one of the most important applications of the PXR source. In particular, the methodology referred to as K-edge subtraction (KES) imaging is a typical application utilizing the ener ... More
Presented by Prof. Yasushi HAYAKAWA on 27 Sep 2016 at 12:50
A high-energy (up to 3 kJ in ns pulses) UV radiation (λ=248 nm) of KrF laser is successfully used in the Inertial Confinement Fusion (ICF) [1]. For ~ 1GW peak power in numerous angular multiplexed beams, nonlinear effects were not observed yet under propagation along ~100-m air path and in transmissive optics. TW peak power of sub-ps UV pulses at Ti:Sapphire/KrF GARPUN-MTW laser facility exceeds ... More
Presented by Dr. Vladimir ZVORYKIN on 29 Sep 2016 at 16:15
Type: Oral presentation Session: S1.1: Channeling & Radiations in Crystals
A new diffusion equation is suggested to correctly describe the channeling particle diffusion in transverse energy, taking into consideration the contribution of both the fourth power of incoherent scattering angle to the transverse energy dispersion and the catastrophic dechanneling effect, caused by the large-angle single incoherent scattering. This equation is reduced to the Sturm-Liouville pro ... More
Presented by Prof. Victor TIKHOMIROV on 26 Sep 2016 at 09:45
Type: Poster Session: PS1: Poster Session
As a rule, an intensity spectrum of undulator radiation (UR) is calculated in the classical approach even for electron energy larger than 10 GeV. Such a spectrum is determined by an electron trajectory in an undulator neglecting by radiation losses. Using the Planck's law, the UR photon spectrum can be calculated from the obtained intensity spectrum both for linear and nonlinear regimes. The e ... More
Presented by Prof. Alexander POTYLITSYN on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
The energy dependence of the neutrons yield from d(d,n)3He reaction at deuterons energy 7÷12 KeV in the textured TiD2 target (the micro crystals are aligned mainly along <100> direction) was studied recently in [1] using pulsed plasma Hall accelerator with closed electron current (PHA). In Ref. [2] the authors investigated the neutron yield in the same reaction using textured CVD-Diamond and 30 K ... More
Presented by Dr. Timur TUKHFATULLIN, Dr. Sergey KUZNETSOV on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
The sub-GeV – several GeV electrons channeling radiation (CR) spectrum is characterized by a brilliant maximum at photon energies up to several MeV [1], depending on electron beam energy. This is enough to excite separate nuclear levels (tens or hundreds KeV) and to excite reaction on light Be and D nuclei and even may reach the region of giant dipole resonance (7-8 MeV) in more heavier nucle ... More
Presented by Dr. Oleg BOGDANOV on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S4.1: Charged Beams Shaping
Yu.A. Chesnokov, A.G. Afonin, V.T. Baranov, G.I. Britvich, P.N. Chirkov, V.A. Maisheev, D.A.Savin, V.I. Terekhov Institute for High Energy Physics in National Research Centre Kurchatov Institute, 142281, Protvino, Moscow region, Russia Abstract: Phenomenon of deflection of charged particle beam due to channeling in a bent crystal is good investigated and successfully applied for extraction o ... More
Presented by Prof. Yury CHESNOKOV on 28 Sep 2016 at 09:30
Type: Oral presentation Session: S4.1: Charged Beams Shaping
As a charged particle beam is aligned with one of the main axes of a slightly bent crystal, most of the particles follows the crystal curvature due to multiple scattering with bent crystal axes. This effect is called stochastic deflection and occurs under some circumstances. Indeed, in the case of positively charged particles, a portion of the beam may relax from the axial confinement to planar ... More
Presented by LAURA BANDIERA on 28 Sep 2016 at 09:45
We report the observation of efficient steering of sub GeV electrons at MAMI (MAinzer MIkrotron) facilities by means of planar channeling and volume reflection in a bent silicon crystal. A 15 μm thick plate of (211) oriented Si was bent to cause quasi-mosaic deformation of the (111) crystallographic planes, which were used for coherent interaction with the electron beam. The plate bending was o ... More
Presented by Dr. Davide DE SALVADOR on 28 Sep 2016 at 12:35
Type: Oral presentation Session: S4.1: Charged Beams Shaping
Recent experiments in CERN and IHEP have demonstrated the simple method of focusing of hadron beams with the help of specially fabricated bent single crystals. In these experiments the parallel beam was transformed in the focusing one on a distance equal approximately to 1-2 meter from a crystal. In this report we discuss further development of focusing on the basis of bent crystals. ... More
Presented by Dr. Vladimir MAISHEEV on 28 Sep 2016 at 10:00
Type: Poster Session: PS3: Poster session
Based on results of paper [1] devoted to study of volume reflection and volume capture we develope the so name "one-trajectory approximation of a diffusion process" for conditions of channeling process in straight and bent single crystals. We extend this approximation for a sufficiently long crystals. We also consider posively and negatively charged hadron beams. References [1] S. Bellucci, Yu. ... More
Presented by Dr. Vladimir MAISHEEV on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.2: Channeling & Radiations in Various Fields
The studies of quasi-Cherenkov radiation produced by a charged particle moving through crystal built from parallel metallic wires (wire media) have demonstrated that the intensity of radiation grows essentially when the wavelength becomes comparable with the wire radius (kR~1). Until recently, the interaction of electromagnetic waves with wire media was analyzed in the approximation of isotropic ... More
Presented by Mr. Evgeny GURNEVICH on 26 Sep 2016 at 18:20
In this report we present experimental investigations of the THz radiation generated from a corrugated capillary and a blank capillary with reflectors, using a femtosecond electron beam of LUCX accelerator at KEK, Japan. LUCX is capable of generating a train of 4 bunches each with 150 µm (500 fs) duration and 200 µm transverse size. We present measurements of the angular distributions of the THz ... More
Presented by Dr. Konstantin LEKOMTSEV on 30 Sep 2016 at 10:00
Type: Poster Session: PS1: Poster Session
It is well known [1-2] that the particle trajectory in a axial symmetric potential U(r), is defined by two-dimensional equation of motion with effective potential Ueff(r)=U(r) + Mz2/2mr2, where m is the particle mass and Mz is its conserved angular momentum. The transversal movement of electrons or positrons in axial channeling mode must be considered in quantum approach based on the Schröding ... More
Presented by Prof. Nikolay KALASHNIKOV on 26 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
Volume FEL (VFEL) lasing in centimeter and millimeter wavelength ranges [1-5] is an encouraging demonstration of the potential for the development of similar sources in other ranges of electromagnetic spectrum. This paper considers THz generation by a relativistic electron beam in a VFEL whose slow-wave structure (resonator) consists of a rectangular waveguide with an array of periodically straine ... More
Presented by Mr. Evgeny GURNEVICH on 27 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
The solution of the Dirac equation for the electron (positron) in a continuous potential of the crystal axis taking into account the periodicity of the crystal in the direction of the axis was found [1]. In a present report using those wave functions we theoretical study the coherent photo-production of e +e- pairs by photons in the crystal taking into consideration the effect of channeling of cr ... More
Presented by Prof. Yuri KUNASHENKO on 26 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
Pyroelectric crystal with a tungsten tip is a well-known setup used to accelerate ions for the D-D neutron generation [1,2]. The use of the tungsten tip enables to ionize residual gas in a local volume, generating ions for further acceleration. Such peculiarity allows developing a compact neutron source. The neutron flux produced by such generator is low but can be applied for different calibrati ... More
Presented by Mr. Andrey OLEINIK on 27 Sep 2016 at 18:40
The demand of the Terahertz radiation in various fundamental and applied research fields is increasing steadily. To address the requirement, a project to construct a compact Free Electron Laser by using a normal conducting photocathode electron gun has been conceived at Inter University Accelerator Centre (IUAC), New Delhi, India [1, 2]. In this facility, a single laser pulse will be split in to m ... More
Presented by Dr. Subhendu GHOSH on 30 Sep 2016 at 14:30
Two high-accuracy goniometers equipped with two bent silicon crystals were installed in the betatron cleaning insertion of the CERN Large Hadron Collider (LHC) during its long shutdown. First beam tests were recently performed at the LHC with 450 GeV/c and 6500 GeV/c stored proton beams to investigate the feasibility of beam halo collimation assisted by bent crystals. For the first time channeling ... More
Presented by Dr. Walter SCANDALE on 28 Sep 2016 at 11:20
Free Electron Lasers are widely exploited in applications and are now very effective tools for different types of studies from Solid State Physics to Structural Biology. The reliability of these devices, the high spectral flux, the possibility of controlling the spectral purity and the time duration of the individual pulses makes them attractive in further fields of research, including fundamenta ... More
Presented by Giuseppe DATTOLI on 25 Sep 2016 at 15:10
Type: Poster Session: PS3: Poster session
The development of intense and coherent electromagnetic sources offers novel pathways in the search for new particles and exotic phenomena. A recently growing interest is dedicated to the low mass particle candidates of Dark Matter. We envisage the possibility of developing a multipurpose facility dedicated to the search of Axion-Like Particles, ALPs, based on the use of Free Electron Laser ... More
Presented by Federico NGUYEN on 29 Sep 2016 at 18:40
Grating transition radiation (GTR), which is a backward radiation, emitted by electrons interacting with a diffraction grating was first observed at optical wavelength region at 1999 [1]. In this report we present the experimental investigation of spectral and orientation dependences of a coherent GTR (CGTR) in sub-THz wavelength region emitted by a 8 MeV electron at KEK LUCX facility. The CGTR ... More
Presented by Dr. Gennady NAUMENKO on 30 Sep 2016 at 10:45
High peak current electron bunch trains can find applications in high transformer ratio wakefield acceleration and high power tunable narrow band THz production. Based on the TTX (Tsinghua Thomson-scattering X-ray) facility, we performed experiments on high peak current bunch train production by nonlinear longitudinal space charge oscillation and obtained narrow band THz radiation via coherent tra ... More
Presented by Dr. Lixin YAN on 30 Sep 2016 at 11:50
The transversal motion of charged particles (electrons or positrons) in axial channeling regime can be characterized by 2 main quantum numbers: n – defining the energy level of the particle transversal motion and l – defining its momentum, which always is directed along the channel axis OZ. The transitions between different energy levels would result in electromagnetic radiation – the same w ... More
Presented by Prof. Nikolay KALASHNIKOV
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
Most targets from natural and industrial materials, used for Cerenkov radiation (ChR) generation have a refractive index in millimeter wavelength region n> 1.4. It is often a problem to output the radiation from such cylindrical or planar targets because the angle of incidence of ChR on the outer surface of target is greater than the angle of total internal reflection. In this report we present th ... More
Presented by Dr. Gennady NAUMENKO on 26 Sep 2016 at 15:45
Type: Poster Session: PS1: Poster Session
When a relativistic charged particle is incident on a crystalline target, parametric X-ray radiation (PXR) is produced in the Bragg direction [1]. This radiation process can be regarded as diffraction of virtual photons associated with the incident particle. Recently, PXR has been studied as a new beam diagnostic method [2-5]. In such studies, measurements of PXR angular distributions are importan ... More
Presented by Dr. Yuichi TAKABAYASHI on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S2.3: Channeling & Radiations in Various Fields
The problem of muon channeling in a standing wave lattice formed by electromagnetic waves is considered. Possible applications of this effect in accelerator physics are discussed. The charged particles motion in the field of standing electromagnetic wave can undergo the features similar to well-known phenomenon of particles channeling in crystals [1]. While a charged particle enters the field o ... More
Presented by Dr. Anton BABAEV on 27 Sep 2016 at 10:45
Type: Oral presentation Session: S4.2: Charged Beams Shaping
We explore an idea of the use of new superconducting synchrotron placed in the SPS tunnel as the FCC proton injector. The maximum output proton energy will depend on available dipole magnets and can be estimated in the range (1.5 − 3.5) TeV with dipoles from 7 T to 16 T, respectively. The extraction scheme is based on the usage of bent crystal deflectors that could provide beam extraction effici ... More
Presented by Prof. Alexander KOVALENKO on 28 Sep 2016 at 11:50
Type: Poster Session: PS2: Poster Session
Nowadays there is a tendency to use short bunches rather than long ones. The shorter electron bunch is, the shorter the pulse of generated radiation can be. Extremely short pulses of electromagnetic radiation are to be widely used in nanotechnology, medicine, biology. In this report we investigate effects of correlations between electrons in transition radiation as far as these effects remain outs ... More
Presented by Ms. Darya DANILOVA on 27 Sep 2016 at 18:40
A study of the polarization of coherent Smith-Purcell Radiation (cSPr) has been carried out at the LUCX (KEK) facility using an 8 MeV electron beam. Two orthogonal polarizations of the radiation were measured and the degree of polarization was calculated. The experimental result was compared to simulation results calculated using a semi-analytical surface current model. Two dimensional scans were ... More
Presented by Ms. Hannah HARRISON on 30 Sep 2016 at 09:30
Tunable, source of coherent THz radiation driven by pre-bunched electron beam is discussed. We consider the generation of the multi-bunch train by using either self-modulation instability in a plasma channel or radiating a photocathode with a train of femtosecond laser pulses. By changing the plasma density in the channel or distance between the laser pulses, variation of the bunch train modulatio ... More
Presented by Dr. Ivan KONOPLEV on 30 Sep 2016 at 15:00
Type: Oral presentation Session: S1.2: Channeling & Radiations in Crystals
The possibility of the analysis and interpretation of the reported experiments with the megajoule National Ignition Facility (NIF) laser on the compression of capsules in indirect-irradiation targets by means of the one-dimensional RADIAN program in the spherical geometry has been studied. The results of the simulations are in satisfactory agreement with the measurements and correspond to the rang ... More
Presented by Dr. Galina VERGUNOVA on 26 Sep 2016 at 12:50
Type: Poster Session: PS3: Poster session
The LAUPER project aims to demonstrate the feasibility of a Laue lens optimized to operate with X-rays emitted by a conventional X-ray tube to produce a focused photon beam for radiotherapy applications. In the context of tumor treatment, radiotherapy is an important method consisting in imparting a radiation dose to a target volume in order to destroy cancer cells. Any radiotherapy treatment aims ... More
Presented by Andrea MAZZOLARI on 29 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
An investigation on stochastic deflection of high-energy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that it exists a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to t ... More
Presented by Prof. Nikolai SHUL'GA on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
In the recent publication [1] the authors had considered the resonance interaction of the laser radiation with ultra-relativistic electrons in planar channeling regime. The idea of the effect was simple: even though the distances between energy levels of channeled electrons and the energies of laser photons may belong to different ranges the Doppler effect bring may help them to match each other w ... More
Presented by Prof. Nikolay KALASHNIKOV on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
An investigation on the probability of close collisions of high-energy charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation we analyzed the dependence of this probability from the orientation of the crystal with respect to the direction of fast charged particles motion. Comparison of the probability of close collisions was done for th ... More
Presented by Prof. Nikolai SHUL'GA on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
Recently, the effect of mirroring of sub-GeV electrons by a thin Si half-wave crystal (HWC) was experimentally observed and explained by computer simulations [1]. The features of corresponding radiation spectra [2] at HWC channeling are described using the code BCM-1 [3]. This code was also used earlier in calculations of positrons yield using channeling radiation [4]. The first estimation of t ... More
Presented by Mr. Sergei ABDRASHITOV on 26 Sep 2016 at 18:40
Type: Poster Session: PS2: Poster Session
As is known, the channeling radiation (CR) of high-energy electrons in a crystalline target (radiator) and subsequent electron-positron pair production in downstream amorphous target (convertor), so called a “hybrid” solution [1, 2], is the effective positron source. The Mathematica™ code BCM-1 [3] developed by the authors enables calculating the trajectories and radiation spectra of elec ... More
Presented by Mr. Sergei ABDRASHITOV on 27 Sep 2016 at 18:40
Modern and future accelerators, such as linear colliders and X-ray Free Electron Lasers (X-FELs), will be capable of producing femtosecond and sub-femtosecond electron bunches with unprecedented intensity. Current techniques, such as the transverse deflecting cavity, have a resolution of approximately 1.3fs, but the beam is destroyed during the measurement process. A new non-destructive method, wh ... More
Presented by Mr. Tom VAUGHAN on 29 Sep 2016 at 10:15
Type: Oral presentation Session: S1.2: Channeling & Radiations in Crystals
The concept to create a non-conventional intense positron source by application of channeling radiation (CR) generated in a crystalline target by electrons of energy of several GeV was proposed in [1] and experimentally proven later on [2]. In a hybrid-source setup, the generation of radiation in a single radiator crystal is separated from the successive conversion into e+e̶ - pairs in an amorpho ... More
Presented by Dr. Behnam AZADEGAN on 26 Sep 2016 at 11:50
Preliminary intensity distributions for Smith-Purcell radiation generated by a grating with its period skewed with respect to the propagation direction of the particle beam will be presented. The results have been obtained using the well-established surface current model. An outline of the calculations will be described, along with qualitative descriptions of the radiation distributions generated ... More
Presented by Dr. Andrew LANCASTER on 30 Sep 2016 at 09:45
One of the goals of the CRYSBEAM project is to perform a feasibility study of design and manufacturing of bent crystals with a geometry optimised for extraction of the proton or the lead ions beams circulating in the LHC. In the frame of the UA9 experiment, aiming at collimation of the LHC circulating beam by means of channeling in bent crystals, steering of a 6.5 TeV proton beam at an angle of a ... More
Presented by Andrea MAZZOLARI on 28 Sep 2016 at 12:05
Type: Oral presentation Session: S1.1: Channeling & Radiations in Crystals
Spectral features of proton channeling radiation, revealed by the interference of two modes of circular waves with the same frequency and amplitude, are studied. The beam modulation is resolved using the realistic Monte Carlo simulation by taking into account the degree of spatial coherence and longitudinal coherence length, multiple scattering effect, electron energy loss, emission angles, and p ... More
Presented by Dr. Vesna BEREC on 26 Sep 2016 at 10:00
Type: Poster Session: PS1: Poster Session
Parametric X-radiation (PXR) is generated by electrons of crystalline target when the projectiles (electrons) pass through the target. The radiation is amplified at the specific directions due to the periodicity of crystallographic structure, i.e. due to diffraction. One of the technical challenges in the commissioning and operation of modern accelerators is the measurement and diagnostics of b ... More
Presented by Dr. Anton BABAEV, Prof. Alexander POTYLITSYN, Alexey GOGOLEV on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S1.1: Channeling & Radiations in Crystals
This work presents continuation of experimental and theoretical studies of the scattering of 255 MeV electrons by aligned crystals at SAGA-LS accelerator facility. In the previous series of experiments we studied the doughnut scattering (DS) [1], scattering at planar alignment (SPA) [2] and mirroring [3-5]. The advantage of these studies is the fixed electron beam energy and different crystal thic ... More
Presented by Dr. Timur TUKHFATULLIN, Dr. Yuichi TAKABAYASHI on 26 Sep 2016 at 10:30
Type: Poster Session: PS2: Poster Session
We consider radiation produced by a point charge flying through the plane interface between vacuum and half-infinite isotropic chiral medium. For description of chiral medium, we use symmetrized material relations and Condon dispersion model [1]. We deal with charge motion from vacuum into medium and backwards. In the case where charge enters medium, we perform generalization of paper [2], where a ... More
Presented by Dr. Sergey GALYAMIN on 27 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
Nowadays X-ray absorption spectroscopy is widely used in the X-ray structural analysis [1] and can be applied to elemental analysis of substance [2]. A special group of absorption analysis methods imply measurements of the radiation absorption coefficients at a few energy lines that allow estimating a number of investigated object characteristics. Implementation of these methods requires X-ray bea ... More
Presented by Mr. Yury CHEREPENNIKOV on 29 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
In Ref. [1] the authors investigated the neutron yield in the d(d,n)3Hе reaction using textured CVD-Diamond and 20 keV deuteron beam from HELIS accelerator which delivers the deuteron beam with small angular and energy divergences. The authors of [1] suggested that the observed enhancement of neutron yield is connected both with the screening and channeling effects. To clarify the role of cha ... More
Presented by Dr. Timur TUKHFATULLIN on 26 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
The tree plantation conditions are the one of the most sensitive indicators of environmental state. The high levels of correlation relationships between morphological and physiological parameters of needle and toxicological loads were established [1]. It is known, that woody plants are highly sensitive to anthropogenic load, so they can serve as adequate indicators of the ecosystems condition [2-3 ... More
Presented by Mr. Sergei STUCHEBROV on 29 Sep 2016 at 18:40
The coherent radiation generated by a short electron bunches is well studied and finds a broad application for different scientific communities. However, the improvement projects towards the implementation of the compact accelerator system providing the high-charge and ultra short electron bunches are still attractive and open up a new possibility of the high-brightness coherent radiation generati ... More
Presented by Mr. Mikhail SHEVELEV on 30 Sep 2016 at 10:15
Type: Poster Session: PS3: Poster session
In this work, we continue investigations of non-divergent radiation in volume and planar wire structures with small period. Unlike previous works, we consider the bunches moving along the semi-infinite planar wire structure. Besides, we consider not only thin bunches, but also bunches with finite cross-section. We analyze surface waves generated by a charged-particle bunch at the semi-infinite ... More
Presented by Dr. Sergey GALYAMIN on 29 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
The work is devoted to features of parametric X-ray radiation - PXR. On the base of the results obtained in [1] and [2] (and confirmed experimentally in [3]), it is noted that the dependence of maximum intensity on electrons energy for PXR and PXR at channeling (PXRC) is very different. The cause is in band structure of energy levels transverse motion. The relative difference between the intensiti ... More
Presented by Mr. Yuri EYKHORN on 26 Sep 2016 at 18:40
Type: Poster Session: PS1: Poster Session
As it was shown in [1], the radiation intensity of Parametric X-ray Radiation (PXR) for the different types of accelerated nuclei is proportional to Z2. I our work the same problem is solved for ions. However, in contrast to [1] to calculate PXR radiation intensity, we have used the formula, obtained from the dynamical theory [2] within the framework of multipath approach developed by Ohtsuki ... More
Presented by Prof. Konstantin KOROTCHENKO on 26 Sep 2016 at 18:40
Type: Poster Session: PS3: Poster session
Bent silicon crystals have been measured to deflect 400 GeV/c protons thanks to channeling along the <110> axis with a 61 % efficiency. This is found to be comparable with the deflection efficiency due to planar channeling and considerably larger than in the case of the <111> axis . Besides, the probabilities of inelastic nuclear interactions of protons crossing the crystal are measured in chan ... More
Presented by Enrico BAGLI on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S1.2: Channeling & Radiations in Crystals
It was predicted and observed in 1980-th [1-6] that both electron-positron pair production by gamma-quanta and gamma-quanta emission by electrons and positrons are strongly enhanced at the energies exceeding tens of GeV in oriented crystals. Crystals are widely used in the electromagnetic calorimeters, e.g. the electromagnetic calorimeter ECAL of Compact Muon Solenoid at LHC is made of PWO crystal ... More
Presented by Prof. Alexander LOBKO on 26 Sep 2016 at 12:05
Type: Poster Session: PS3: Poster session
The analysis of experimental data obtained in the study of grazing interaction of fast electron beams with flat dielectric surfaces demonstrates a dependence of the surface charge distribution formation on the dielectric material. We found that the angular distribution of the electron beam does not depend strongly neither on the length of the surfaces nor on the beam current. In addition, the new ... More
Presented by Dr. Alexander KUBANKIN on 29 Sep 2016 at 18:40
Type: Oral presentation Session: S2.1: Channeling & Radiations in Various Fields
In recent years, emission of terahertz (THz) electromagnetic waves attracts essential attention of researchers. Radiation in this frequency region can be used for variety of applications, for example, investigation of biology objects, beam diagnostics in accelerators, etc. One recent idea for producing efficient THz radiation consists in passing of specially prepared electron bunch through a wakef ... More
Presented by Dr. Sergey GALYAMIN on 26 Sep 2016 at 16:00
“Basic Channelling with Mathematica©” BCM–1.0 is the computer code developed by the authors for solving numerous problems related to channelling [1]. The first version of the computer code allowed solving equation of motion of channelled relativistic particles in periodic electrical field of axis and planes both in the classical and quantum approach. Several software packages also have been ... More
Presented by Dr. Timur TUKHFATULLIN on 29 Sep 2016 at 09:45
Type: Poster Session: PS1: Poster Session
Quantum mechanical theory for channeling of relativistic charged particles in the bent crystals is considered. Quantum effects of underbarrier tunneling are essential when the radius of the crystal channel curvature is close to its critical value. In this case the wave functions of the quasi-stationary states corresponding to the particles captured in a channel can be presented in the analytical f ... More
Presented by Prof. Alexander LOBKO on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S2.2: Channeling & Radiations in Various Fields
We investigate the radiation from a charged particle rotating around a diffraction grating on a cylindrical surface. The grating consists metallic strips parallel to the cylinder axis. The expressions are derived for the electric and magnetic fields and for the angular density of the spectral-angular distribution of the radiation intensity. The angular density of the radiation intensity is decompo ... More
Presented by Prof. Aram SAHARIAN on 26 Sep 2016 at 17:20
Type: Oral presentation Session: S1.4: Channeling & Radiations in Crystals
Under coherent interactions, particles undergo correlated collisions with the crystal lattice and their motion result in confinement in the fields of atomic planes, i.e. particle channeling. Other than coherently interacting with the lattice, particles also suffer incoherent interactions with individual nuclei and may leave their bounded motion, i.e., they de-channel. This latter is the main limi ... More
Presented by Vincenzo GUIDI on 27 Sep 2016 at 17:20
The aim of this report is to investigate the full size electromagnetic calorimeter for the muon G-2 experiment at Fermilab. A calorimeter module (24 are expected in the experiment) consists of a Delrin front panel for installation of the laser calibration system, 54 PbF2 Cherenkov crystals wrapped by the black Millipore paper, and silicon photo-multiplier sensors. We report here on simulation of 2 ... More
Presented by Mr. Aleksandr SAVCHENKO on 29 Sep 2016 at 10:45
Unlike Synchrotron Radiation, which is naturally emitted as particles are deflected in undulators, wigglers or bending magnets, Diffraction Radiation (DR) [1] is produced as charged particles pass in the close vicinity of a dielectric or a metal. For highly relativistic particles, diffraction radiation can produce non-negligible amount of photons in standard beam conditions. DR from slits and hol ... More
Presented by Dr. Thibaut LEFEVRE on 30 Sep 2016 at 15:30
Type: Oral presentation Session: S1.4: Channeling & Radiations in Crystals
Depth oscillations of electronuclear reactions were observed in original experiment in [1]. The computer simulation of the depth oscillations effect of the electronuclear reactions yield was performed in [2] for 700 MeV electrons at <111> axial channelling in silicon crystal. In this work the oscillations effect is investigated for (220) planar channelled electrons in silicon crystal in the ... More
Presented by Mr. Yuri EYKHORN on 27 Sep 2016 at 18:05
Type: Poster Session: PS1: Poster Session
Radiation of charged particles passing through a set of equidistant ridges on the surface of a single crystal is analyzed. The ridge thickness is a half of the particle trajectory period at channeling in a thick crystal. Passing through such set of half-wave crystals the particle can move on quasi-undulator trajectories [1]. Properties of radiation emitted by swift positrons from such “multicrys ... More
Presented by Dr. Julia JANZ on 26 Sep 2016 at 18:40
Type: Oral presentation Session: S2.2: Channeling & Radiations in Various Fields
Charged particles moving in periodical structures produce different kinds of radiation, including parametric radiation and Smith-Purcell radiation (SPR), which are rather close in its nature, indeed. The latter is well investigated for different types of gratings like lamellar, eshelette, gratings made of strips, etc. Smith-Purcell radiation from photonic crystals has been studied less. As it was ... More
Presented by Ms. Darya SERGEEVA on 26 Sep 2016 at 17:35