Dr
Dick Carrigan
(Fermilab), Dr
Edward Tsyganov
(UTSWMC)
23/09/2012, 15:15
This short primer will cover the developments of GeV and TeV-scale channeling over more than four decades and also look to the future. Early studies at CERN and Fermilab confirmed that GeV scale channeling continued the behavior seen in the MeV regime. While working on the first channeling experiment at Fermilab, Tsyganov suggested using bent crystals. This enormously amplified the...
Susanna Guiducci
(LNF)
23/09/2012, 16:15
An overview of the SuperB, high luminosity B-Factory project in Italy, will be presented. The main design features to reach the very high luminosity requested and a status of progress in the design will be given. The option of using the injector linac for accelerating a ultra low emittance beam for a SASE FEL facility will be also presented.
Prof.
M.L. Carvalho
(Atomic Physics Centre, University of Lisbon)
23/09/2012, 17:15
This work reviews the most used optical systems for X-ray microprobes and summarizes the experiences in research with synchrotron radiation as well as with X-ray tube generators.
The need for smaller beam spot sizes for various applications and the unique properties of X-rays have induced a remarkable and fast development in X-ray optical systems. These systems are divided into four main...
Prof.
Nikolai Shul'ga
(Akhiezer Institute for Theoretical Physics of NSC KIPT)
24/09/2012, 09:00
Coherent Bremsstrahlung
The evolution in space and time of localized high-energy wave packets which take place in processes of transition radiation and bremsstrahlung by ultra relativistic electrons is considered. It is shown that high energies make stabilizing influence upon the motion of such packets and that the lengths within which their dispersion and reconstruction into the packets of diverging waves occurs can...
Dr
Micola Bondarenco
(Kharkov Institute of Physics and Technology)
24/09/2012, 09:30
Radiation from an electron passing through a sufficiently thin
oriented crystal is of dipole type, and so its spectral-angular
distribution must be isomorphic for all species of crystals,
depending only on the direction and anisotropy of the electron
deflection in the crystal. The dipole radiation angular
distribution, even at photon energies commensurable with the
electron energy,...
Mr
Sergii Trofymenko
(Akhiezer Institute for Theoretical Physics of NSC KIPT)
24/09/2012, 09:50
The process of evolution of electromagnetic field around a particle during its entry to a dielectric medium is considered. The influence on this field of the processes of its dispersion as of an electromagnetic wave packet as well as of its absorption in the substance is considered. The special attention is drawn to the analysis of evolution of Fourier-components of the field around the...
Dr
Dmitry Karlovets
(Tomsk polytechnic university)
24/09/2012, 10:10
Coherent Bremsstrahlung
When moving in a substance or nearby some optical inhomogeneity, a charged particle produces the so-called polarization (or induced) currents, which can be considered as a source for different types of polarization radiation: Cherenkov radiation (ChR), transition radiation (TR), diffraction radiation (DR), Smith-Purcell radiation (SPR), etc. We apply the method of induced currents [1] for a...
Prof.
Yury Pivovarov
(National Research Tomsk Polytechnic University)
24/09/2012, 10:30
Coherent Bremsstrahlung
When the relativistic nucleus penetrates through a matter, besides nuclear reactions the relativistic Coulomb excitation of projectile nucleus occurs. The de-excitation results in emission of electromagnetic radiation, characterized by continuous spectrum with broad maximum in the case of Coulomb excitation to giant dipole resonance (A.Sorensen, Channeling-2010). If the separate nuclear...
Prof.
Karo Ispirian
(A.I. Alikhanian National Laboratory (Yerevan Physics Institute))
24/09/2012, 11:10
Coherent Bremsstrahlung
A review on the coherent X-ray bremsstrahlung (CXBR), X-ray transition (CXTR), resonance transition (CXRTR), diffraction (CXDR), channeling (CXCHR), parametric (CXPXR) and crystalline undulator (CXCUR) radiation produced by microbunched beams passing through crystalline radiators without the accompanying SASE beams of X-ray FELs is given. Formulas for the spectral and angular distributions...
Dr
Sergii Fomin
(National Science Center "Kharkov Institute of Physics and Technology")
24/09/2012, 11:40
Coherent Bremsstrahlung
The multiple scattering of ultrarelativistic electron on atoms of matter conduces to violation of the dipole regime of radiation process. It occurs when the mean-square angle of electron scattering within the coherence length of radiation θms exceeds the characteristic angle of radiation of relativistic particle θ ~ 1/γ, where γ is the electron Lorenz-factor. One of the well-known examples of...
Prof.
Yuri Kunashenko
(National Research Tomsk Polytechnic University; Tomsk State Pedagogical University)
24/09/2012, 12:00
In a present report we develop theory and study coherent bremsstrahlung emitted from neutrons passing through crystal with small angle with respect to crystal axis. We calculate the dependence of the neutron bremsstrahlung cross-section on the neutron energies, and emitted photon energies.
Mr
Konstantin Kruchinin
(Tomsk Polytechnic University)
24/09/2012, 12:20
Coherent Bremsstrahlung
Beams of polarized electrons and positrons play an important role in
experiments for discovering physics beyond the standard model [1].
Circularly polarized $\gamma$-beams are used for
longitudinally-polarized positrons producing. Nowadays, there are
experimentally improved methods for generation circularly polarized
$\gamma$-beams based on electron radiation in the helical...
Dr
Vladimir Ganenko
(National Scientific Center "Kharkov Institute of Physics&Technology", Kharkov, Ukraine)
24/09/2012, 12:40
Coherent Bremsstrahlung
Coherent bremsstrahlung (CB) linearly polarized photon beam has been produced at the MAX-lab facility at interaction of electron beam with energy E0=192.7 MeV with diamond crystals 0.1 mm [1].
Since then the CB characteristics of the A-type were studied for diamond crystal 0.1 mm and more thin crystal 0.5 mm thick, as well, for orientations when main contribution to the CB cross section gave...
Prof.
Vladimir Baryshevsky
(Research Institute for Nuclear Problems)
24/09/2012, 16:00
Channeling Radiation & Related Phenomena
The time evolution of parametric X-Ray radiation (PXR) and Diffracted Channeling X-Ray Radiation (DCR) produced by a relativistic charged particle passing through a crystal is studied. Formulas describing this processes are derived.
It is shown that the conditions can be realized under which parametric X-ray radiation and DCR lasts much longer than the particle flight time through the...
Prof.
Robert Avagyan
(Alikhanian National Science Laboratory, Yerevan Physics Institute)
24/09/2012, 16:30
Channeling Radiation & Related Phenomena
The experimental results on radiation of (4-16) GeV positrons channeled between the diamond crystallographic planes have been compared with theories without taking into account the medium polarization in many works. Recently it has been developed the corresponding theory taking into account the density effect, and it has been carried out comparison with the experimental data only at 4 GeV and...
Prof.
Nikolay Kalashnikov
(NATIONAL RESEARCH NUCLEAR UNIVERSITY MEPHI)
24/09/2012, 16:50
Channeling Radiation & Related Phenomena
The photon emission of a quantum channeled particle, accompanied by a plasmon excitation in a crystal target is considered. It is taken into account that the plasmon energy in the crystal is of the same order with the depth of the potential well in which the channeled particle moves . A weak dispersion of the plasmons in the crystal is taken into account, which leads to the selection of the...
Dr
Konstantin Korotchenko
(National Research Tomsk Polytechnic University)
24/09/2012, 17:10
Channeling Radiation & Related Phenomena
The goal of our repot is compare the results obtained by exact formula of DCR angular distribution and ones in dipole approximation.
Prof.
Yu. L. Pivovarov
(Tomsk Polytechnic University,Tomsk, Russia)
24/09/2012, 17:50
Prof.
Valery Fedorov
(Petersburg Nuclear Physics Institute, Gatchina, Russia)
24/09/2012, 18:20
Channeling Radiation & Related Phenomena
Here we discuss new effects resulting from the recently predicted and discovered strong electric fields (up to 109 V/cm), which affect the neutrons moving through noncentrosymmetric crystals.
That opens, for example, a new way for searching the electric dipole moment of a neutron (nEDM) with the sensitivity comparable or exceeding that for the most sensitive now magnetic resonance method.
A...
Ms
Alena Ananyeva
(Goethe-Universität, 60325 Frankfurt am Main, Germany)
24/09/2012, 18:40
Channeling Radiation & Related Phenomena
In the present contribution we report on the first measurement of Resonant Coherent Excitation of Li-like uranium ions. A cooled, well collimated beam of U89+ at 192 MeV/u delivered by the Experimental Storage Ring (ESR) at GSI, Darmstadt (Germany), was sent through a 10 μm effective thickness Si-crystal mounted on a high precision, 5-axis goniometer under the (220) planar orientation. The...
Dr
Denis Dauvergne
(Institut de Physique Nucléaire de Lyon)
24/09/2012, 19:00
Channeling Radiation & Related Phenomena
Prof.
Vladislav Syshchenko
(Belgorod State University)
24/09/2012, 19:20
Poster Session
The results of computation of transverse energy levels for the electrons moving in the system of parallel atomic strings in the axial channeling regime are presented.
Prof.
Sergey Blazhevich
(Belgorod State University)
24/09/2012, 19:21
Poster Session
A dynamic theory of coherent radiation generated along the velocity of the relativistic electron crossing a layered periodic medium in Bragg geometry is constructed for general case of asymmetric reflection. The group velocities of the X-ray waves relating to different branches of dispersion equation solution are investigated and it is shown that the contributions of these waves in the total...
Mr
Savaş Birol
(Istanbul University)
24/09/2012, 19:22
Poster Session
This is a pilot study to investigate whether it is possible to observe the aforementioned problems of LPM theory in low-Z mediums at an available accelerator environment (i.e. CERN-SPS beams). For this purpose, under the guidance of previous experiments [2, 3] we performed several GEANT4 simulations with realistic setups.
Mr
Enrico Bagli
(FE)
24/09/2012, 19:23
Poster Session
Charged particles impinging on a crystal can be captured into channeling regime provided that their trajectories are aligned with crystalline planes or axes within the critical angle for channeling [1]. Experimental knowledge about channeling of negative particles is less studied due to experimental difficulties arising from peculiarities of particle motion in the crystal. However, recent...
Mr
Onur Buğra Kolcu
(Istanbul University)
24/09/2012, 19:24
Poster Session
The SPARC facility at LNF delivers 150MeV electron beam with high quality. In this work the “dogleg” area of the SPARC facility is evaluated for a planned channeling experiment which is a pilot investigation for future positron source experiments. The beam optics simulations for the dogleg section is done up to a crystal and the beam characteristics and the beam spot on the crystal is...
Darya Sergeeva
(National Research Nuclear University "MEPhI")
24/09/2012, 19:25
Poster Session
UV and X-ray polarization radiation of the bunch of charged particles, both diffraction radiation and transition radiation, is investigated theoretically in case when the bunch flies near the edge screen. The form factor is obtained in the most general form, both for longitudinal and transverse distributions particles over the bunch. The form factor is proved to depend on dielectrical...
Dr
Anton Babaev
(Tomsk Polytechnic University)
24/09/2012, 19:26
Poster Session
The channeled ion interacts with the continuous planar electric
field. This electric field not only defines the trajectory of the
ion but also acts on the electrons of ion. Hence, electronic
energy levels are shifted and are split due to Stark effect. The
influence of Stark effect depends on the position of ion in the
planar channel.
In this work the influence of trajectory-dependent...
Dr
Timur Tukhfatullin
(National Research Tomsk Polytechnic University)
24/09/2012, 19:27
Poster Session
The properties of both angular and spatial distribution of 255 MeV electrons at <100> axial channeling in thin silicon crystal has been investigated experimentally at the linac injector of SAGA light source and by computer simulations using a computer code “Basic Channeling with Mathematica©” BCM–1.0 developed by the authors. Comparison of the experimental and theoretical results shows a good...
Mr
Philippe Schoofs
(CERN - EPFL)
24/09/2012, 19:28
Poster Session
Channeling in bent crystals is becoming a reliable and efficient technique for collimating beams. At CERN, the installation of crystals in the LHC is under scrutiny by the UA9 collaboration with the goal of investigating if they are a viable option for the collimation system upgrade. This paper describes a new model of channeling in bent crystals which has been developed from scratch in order...
40.
DYNECHARM++: a Software to Simulate the Motion of Charged Particles in Complex Atomic Structures
Mr
Enrico Bagli
(FE)
24/09/2012, 19:29
Poster Session
Charged particle impinging onto a crystal with small angle with respect to an atomic plane or axis can undergo planar or axial channeling regime with high probability. Trajectory of a ultra-relativistic particle under channeling regime can be studied through the usage of continuous potential approximation [1] and approximation of relativistic equations of motion [2]. Averaged electric field...
Dr
Vladimir Ganenko
(National Scientific Center "Kharkov Institute of Physics&amp;Technology", Kharkov, Ukraine)
24/09/2012, 19:30
Poster Session
In this report it is presented results of data processing and analysis on studying radiation spectra of electrons with energy ~200 MeV in a diamond and silicon crystals at orientations when the electrons move near the crystal axes and planes. Preliminary results were presented in [1].
At energies of some hundred MeV the coherent effects in radiation resulted from an electron dynamic in the...
Dr
Evgeny Mazur
(NATIONAL RESEARCH NUCLEAR UNIVERSITY MEPHI)
24/09/2012, 19:31
Poster Session
A theory of the energy losses for the quantum channeled particle is developed. The probability of generating plasmons in the case of "channel-plasmon” resonance is calculated. The possibility of appearance of the peaks in the curve of the energy loss on the particle energy fixing the distance between the transverse levels of the cross-motion is evaluated. The transition probabilities of ...
Mr
Sergey Abdrashitov
(National Research Tomsk State University, National Research Tomsk Polytechnic University)
24/09/2012, 19:32
Poster Session
Here, we carry out computer simulation of radiation energy loss of the 255MeV electrons and positrons at <100> axial and (100) planar channeling in 20 μm silicon crystal taking into account the angular divergence of the initial electron beam, using computer code BCM-1. The possibility to align thin crystals using the orientation dependence of channeling radiation energy loss is discussed.
Prof.
Yuri Kunashenko
(National Research Tomsk Polytechnic University; Tomsk State Pedagogical University)
24/09/2012, 19:33
Poster Session
In the present report we calculate the cross – section of radiation from axially channeled polarized electron.
Prof.
Levon Grigoryan
(Institute of Applied Problems in Physics)
24/09/2012, 19:34
Poster Session
The radiation from a particle in flight through a plate, the parameters of which along the direction of motion change according to an arbitrary periodical law, has been investigated. The expressions for determination of spectral-angular distribution of radiation energy in vacuum (at large distances from the plate) are derived. The results of corresponding numerical calculations are given.
Dr
Andrey Olchak
(MEPhI, Russia)
24/09/2012, 19:35
Poster Session
Ultra relativistic electrons, moving in a channel along electron plane, may occupy only certain discrete energy quantum levels. Transition between levels is accompanied with emitting electromagnetic radiation. Due to high energy of electrons and due to Lorenz effect, energy of this radiated emission can be very high
This radiation can be additionally stimulated by certain interference with an...
Mr
Konstantin Kruchinin
(Tomsk Polytechnic University)
24/09/2012, 19:36
Poster Session
When a charged particle moves in a medium (or close to it), different types of
polarization radiation can arise: Cherenkov, transition, diffraction radiation, etc.
Because the particle's radiation losses are small compared to its total energy, polarization radiation can be used for non-intercepting beam diagnostic in modern accelerators [1]. Therefore, it is of great interest to investigate...
Prof.
Yuri Kunashenko
(National Research Tomsk Polytechnic University; Tomsk State Pedagogical University)
24/09/2012, 19:37
Poster Session
In a present report we develop theory and study coherent bremsstrahlung emitted from planar channeled positrons passing through crystal with small angle with respect to crystal axis
Mr
Evgenii Frolov
(National Research Tomsk Polytechnic University)
24/09/2012, 19:38
Poster Session
The results of estimation and modeling of nonrelativistic electrons' dynamics in standing electromagnetic wave field, formed by crossed laser beams and accelerating electrostatic field, are shown here. Special interest was paid to defining the conditions of charged particles' bound state occurrence in such fields: a part of the electron beam might be trapped, that could be described as...
Dr
Oleg Bogdanov
(LNF&TPU)
24/09/2012, 19:39
Poster Session
In this report we have presented the results of our study on the problem of dechanneling for the SPARC electron beam energies. Dechanneling processes for electrons in (111), (110), (100) Si crystals based on the solution of Fokker-Planck equation have been studied. The influence of beam redistribution due to the processes of electron both dechanneling and rechanneling on spectral intensity of...
Dr
Evgeny Bessonov
(Lebedev Physical Institute RAS)
24/09/2012, 19:40
Poster Session
Possible parameters of Light Sources based on Backward Rayleigh scattering of laser photons on relativistic ion beams in storage rings are discussed. Both electronic and nuclear ion transitions can be used. Different schemes of ion beam cooling are discussed to decrease the emittance of ion beams and such a way to increase the brilliance of the Light Sources.
Mr
Igor Kyryllin
(Akhiezer Institute for Theoretical Physics of National Science Center Kharkov Institute of Physics and Technology)
24/09/2012, 19:41
Poster Session
The results of recent IHEP (Protvino, Russia) experiment on 50 GeV proton beam extraction from the accelerator by means of a bent crystal are discussed.
Dr
Anton Babaev
(Tomsk Polytechnic University)
24/09/2012, 19:42
Poster Session
This work is devoted to the aspect of crystal collimation concerning the interactions between projectiles of a collimated beam and nuclei of a bent crystal used as a collimator (inelastic nuclear interactions, INI). Namely, here we continue to analyze
the dependence of INI intensity on crystal orientation. Additionally to that analysis here we consider the non-saturated regime of beam passage...
Dr
Anton Babaev
(Tomsk Polytechnic University)
24/09/2012, 19:43
Poster Session
In this work we present the computer code to simulate the influence of crystal collimator on the particle orbits in the storage ring. The code is adopted to be used together with ICOSIM \& ICOSIM++ codes. ICOSIM \& ICOSIM++ allow observing the
particle trajectory through the sequential magnetic collimators of different types. Our program uses the input data in ICOSIM format, simulates the...
Mr
Seyed Ali Mahdipour
(Hakim Sabzevari University)
24/09/2012, 19:44
Poster Session
A non conventional positron source using the intense γ radiation from different planes and axes of Si, C, Ge and W crystals which materialize into e+e- pairs in a tungsten amorphous converter is described. In this work we have calculated channeling radiation spectra from different planes and axes of Si, C, Ge and W crystals. The dependence of radiation on the incident angle of electrons are...
Ms
Elena Fiks
(National Research Tomsk Polytechnic University)
24/09/2012, 19:45
Poster Session
Here, we investigate in detail the influence of channelling in an optically transparent crystal on Cherenkov radiation from relativistic electrons. The obvious break of the Tamm-Frank condition for appearance of the Cherenkov radiation (rectilinear motion with a constant velocity, greater than the phase velocity of light in a crystal) is due to periodic or quasi-periodic motion under...
Dr
M.A. Aginian
(Yerevan Physics Institute)
24/09/2012, 19:46
Poster Session
Theoretical and numerical results on the spectral and angular distributions as well as on total number of the radiated photons of the coherent X-ray channeling radiation (CXChR) produced by microbunched beams channeled in single crystals are obtained. The results show that for certain conditions CXChR has spectral and angular distributions much narrower than the channeling radiation of single...
Prof.
L.A. Gevorgian
(Yerevan Physics Institute)
24/09/2012, 19:47
Poster Session
Analytical and numerical results are obtained on the angular and spectral distributions as well as on the total number of the photons of the coherent X-ray crystalline undulator radiation (CXCUR) produced by microbunched beams passing through a crystalline undulators (CU). The results show that one can use CXCUR for studying the microbunching process in XFELs and for production of additional...
Dr
Ilya Polimatidi
(M.V. Lomonosov Moscow State University)
24/09/2012, 19:48
The subject of this work is description and investigation of some of the recently demonstrated phenomena in the thin crystal channeling related to charged particle refraction effects via computer simulations based on methods developed in [1,2].
In the proposed model charged particle beam evolution is simulated using the trajectory- based approach. The latter can be viewed as the Monte-Carlo...
Prof.
Victor Tikhomirov
(Research Institute for Nuclear Problems)
25/09/2012, 09:00
Channeling & Crystal Collimation
The effect of Multiple Volume Reflection from bent planes of one crystal combines the advantages of the space order of the planar and the strength of the axial fields. The experiments confirme that this effect gives rise to a five-time increase of one-plane Volume Reflection effect and manifests itself in much wider angular region than axial channeling. The advantages of the Multiple Volume...
Prof.
Alexander Kovalenko
(Joint Institute for Nuclear Research)
25/09/2012, 09:30
Channeling & Crystal Collimation
Short review of the experiments on the deflection and extraction (collimation) of high energy ion beams with bent crystals performed in the accelerator centers is presented. The channeling parameters depend on the ratio of particle momentum to its charge pz therefore the efficiency of the crystal deflector is the same for protons and ions with equal pz. The difference appears mainly in...
Mr
Igor Kyryllin
(Akhiezer Institute for Theoretical Physics of National Science Center Kharkov Institute of Physics and Technology)
25/09/2012, 09:50
Channeling & Crystal Collimation
In this report the results of comparative analysis of the efficienciy of charged particle deflection by a bent crystal using different deflection mechanisms in the TeV energy region are presented.
Dr
Gennady Kovalev
(UofM)
25/09/2012, 10:10
Channeling & Crystal Collimation
The scattering of relativistic particles in a bent crystal potential with a
variable curvature is considered using QM curvilinear squared Dirac equation and its classical relativistic spinless analogue with account of a dissipation.
The equations are solved numerically and the result demonstrates
several distinct features:
• The reflection of positive and negative particles when.
•...
Ms
LAURA BANDIERA
(Università di Ferrara, INFN Sezione di Ferrara)
25/09/2012, 10:30
Channeling & Crystal Collimation
In last years, the effects of volume reflection (VR) and multiple volume reflection in one crystal (MVROC) were observed and widely studied mainly in connection with the problem of particle beam steering. Moreover, in the case of ultrarelativistic electron/positron beams, both effects are also interesting from the point of view of radiation emission.
The electromagnetic radiation emitted by...
Mr
MALLIKARJUNA RAO MOTAPOTHULA
(GRADUATE STUDENT)
25/09/2012, 11:10
Channeling & Crystal Collimation
The report contained information about my project includes the fabrication of thin silicon [001] membranes (55nm) and the experimental observation of Rainbow Channeling fine angular distributions through these membranes using a nuclear microprobe facility. The observation of these fine angular structures in the channeling patterns will be the first experimental proof of the simulations done by...
Dr
Andrea Mazzolari
(Ferrara)
25/09/2012, 11:40
Channeling & Crystal Collimation
Channeling effect in bent crystals is used as a power tool for beam steering. Motion of a channeled particle is characterized by oscillations between neighbor bent atomic planes. We studied the interaction between a 2 MeV proton beam and an unbent crystal as thin as 92 nm, i.e. half of the oscillation wavelength, demonstrating that also an unbent crystal can be used to steer charged particle...
Dr
Micola Bondarenco
(Kharkov Institute of Physics and Technology)
25/09/2012, 12:00
Channeling & Crystal Collimation
Recent results [1] on incoherent multiple scattering for charged
particles passing through bent crystals in planar orientation are
surveyed. Regions in the crystal bending radius vs. particle energy
($R$, $E$) plane are determined, where:
i- the number of bent atomic planes crossed by the particle within the intrinsic volume reflection region of extent $\sim R\theta_c$ is greater than...
Dr
Vladimir Maisheev
(IHEP, Protvino, Russia)
25/09/2012, 12:20
Channeling & Crystal Collimation
The mathematical description of beam focusing with the help of bent single crystals is proposed. The description allows us to calculate the parameters of beam focusing at the arbitrary shape of cut of crystal edge and for crystals with the variable curvature.
The results of recent ( April, 2012) experiment on the external proton beam line of IHEP accelerator are presented.
Ilya Polimatidi
(Lomonosov Moscow State University)
25/09/2012, 12:40
Channeling & Crystal Collimation
Prof.
Peter von Ballmoos
(Université de Toulouse / CNRS)
25/09/2012, 16:00
X-ray Channeling & X-ray Optics
Gamma-ray astronomy presents an extraordinary scientific potential for the study of the most powerful sources and the most violent events in the Universe. Those extreme conditions occur generally at the endpoints of stellar lives, when the comparatively calm thermal evolution gives way to more violent non-thermal processes.
Present telescopes in nuclear astrophysics make use of inelastic...
Prof.
Vincenzo Guidi
(Department of Physics, University of Ferrara)
25/09/2012, 16:30
X-ray Channeling & X-ray Optics
At Sensor and Semiconductor Laboratory (Ferrara, Italy) we have undertaken a research and development plan to implement Si and Ge grooved CDP crystals onto the lens through several methods. An intriguing effect of anisotropy in crystal deformation is exploited to combine the high reflectivity of the CDP with the capability of focusing the radiation onto a very small focal spot. Quasi-mosaicity...
Dr
Alexander Shchagin
(Kharkov Institute of Physics and Tecknology)
25/09/2012, 16:50
X-ray Channeling & X-ray Optics
Before, the evanescent X-ray wave was observed with use of characteristic X-rays as a source of radiation. Recently, V.P. Petukhov proposed the excitation of the evanescent wave by the Okorokov radiation of relativistic ions moving in a crystal [1]. In present paper we discuss possibilities for experimental observation of the evanescent wave excited by parametric X-ray radiation (PXR). The...
Prof.
Alexander Lobko
(Institute for Nuclear Problems, Belarus State University)
25/09/2012, 17:10
X-ray Channeling & X-ray Optics
In the current contribution we analyze PXR-based phase contrast imaging in detail. It is shown that a PXR source can provide necessary spatial resolution, penetrating power, and sensitivity to soft tissue that is required to visualize biological and medical specimens on a scale from millimeters to microns. It should be also mentioned that because higher quality images require greater x-ray...
Prof.
Kouichi Tsuji
(Osaka City University)
25/09/2012, 17:50
X-ray Channeling & X-ray Optics
A nondestructive elemental imaging is important for environmental, forensic, and material sciences. In this seminar, a few approaches for x-ray elemental imaging in the laboratory at OCU will be introduced.
1) Scanning type micro-XRF method including confocal 3D-XRF
A confocal micro XRF instrument was developed using two polycapillary focusing lenses in the laboratory. This instrument...
Dr
Dariush Hampai
(LNF)
25/09/2012, 18:20
X-ray Channeling & X-ray Optics
X Lab Frascati has one of the main activity dedicated to Imaging and tomography reconstruction, improving a new imaging technique on the base of polycapillary optics in order to study low contrast, even in combination with fast developing processes.
In this talk we are going to present our first results on micro-Tomography as possible future development of experimental layout characterized by...
Dr
Luigi Allocca
(Istituto Motori - C.N.R.)
25/09/2012, 18:40
X-ray Channeling & X-ray Optics
Table-top experiment using a microfocus X-ray source for radiography and tomography has been used for investigating the structure of a gasoline pulsed spray flowing from a GDI injector for automotive applications. A Cu Kα X-ray source at 8.048 keV in combination with a polycapillary halflens has been used to focus the radiation on the spray while a CCD detector collected the resulting signal....
Dr
Astrik Gorghinian
(LNF)
25/09/2012, 19:00
X-ray Channeling & X-ray Optics
Augustus has been the first Roman Emperor (27 B.C. - A.D. 14). He introduced a radical reform (23 B.C.) of the Roman monetization. Gold and silver coins were struck under his direct control, while the copper-based money (aes) were under the control of the Senatus.
X-ray microfluorescence analysis has been applied to 477 Augustan coins coming from the National Archaeologic Museum of Florence,...
Dr
W. E. Gabella
(Department of Physics and Astronomy, Vanderbilt University)
26/09/2012, 09:00
X-ray Channeling & X-ray Optics
We have plans to use very low-emittance electron beams to generate channeling x-rays capable of being used for phase-contrast imaging and electron diffraction imaging. We have developed field-emission cathodes made of small needles of diamond with end radii of 10 nm. We have measured emission of 10 µA per tip at modest accelerating fields, and we have fabricated them as single emitters and as...
Dr
Yasushi Hayakawa
(Laboratory for Electron Beam Research and Application (LEBRA), Nihon University)
26/09/2012, 09:30
X-ray Channeling & X-ray Optics
Computed tomography (CT) for light materials such as bio-sample
were carried out using parametric -X-ray radiation (PXR) and a
flat panel detector (FPD).
Tomography images were actually reconstructed from the projection images
which obtained for the measurement time of 5 min to 1 hour.
Dr
Mikhail Mazuritskiy
(Southern Federal University)
26/09/2012, 09:50
X-ray Channeling & X-ray Optics
In this work soft X-ray synchrotron radiation transmitted through microchannel plates was investigated. Primary monochromatic beam penetrates into microchannels of a hexagonally regular polycapillary structure ~ 0.4 mm thick, with channels of 10 µm hole diameter and 12 µm pitch. Fine structure of reflection and XANES spectra at the Si L-edge at the exit of SiO2 MCP has been analysed. The...
Dr
Vahan Kocharyan
(Institute of Applied Problems of Physics NAS RA,)
26/09/2012, 10:30
X-ray Channeling & X-ray Optics
In this work the effect of thermal neutrons focusing in a quartz single crystal under the influence of acoustic fields in Laue diffraction geometry has been theoretically discussed. It is shown, that by the variation of operating parameters of spatial acoustic fields induced in a quartz single crystal, it is possible to monochromatize the neutron beam, tenfold increase its intensity, focus and...
Mr
Xavier Artru
(Université de Lyon, CNRS/IN2P3, IPNL)
26/09/2012, 11:10
Novel sources: PXR&TR&FEL&Plasma
The field of a charged particle passing trough or near an optical fiber induces a transient polarization of the fiber atoms. This polarization turns into radiation, part of which is channelled by the fiber. We call it particle-induced guided light (PIGL). PIGL can also be generated by a particle passing trough or near a metallic object stuck to the fiber. This occurs via surface...
Prof.
Sergey Blazhevich
(Belgorod State University)
26/09/2012, 11:40
Novel sources: PXR&TR&FEL&Plasma
In the present work the dynamic theory of the relativistic electron radiation in periodic layered structure is built in Bragg scattering geometry. The expression for spectral - angular distribution of the radiation is derived and the possibilities of the manifestation of dynamic diffraction effects in the radiation are shown for this scattering geometry.
Mrs
Anna Kotanjyan
(Yerevan State University)
26/09/2012, 12:00
Novel sources: PXR&TR&FEL&Plasma
We investigate the radiation from a charge moving along a helix around a dielectric cylinder immersed in a homogeneous medium. We are mainly concerned with the radiation propagating inside the cylinder. The radiation intensity for the modes propagating inside the cylinder is evaluated by using the work done by the radiation field on the charge and by evaluating the energy flux through the...
Prof.
Alexander Lobko
(Institute for Nuclear Problems, Belarus State University)
26/09/2012, 12:20
Novel sources: PXR&TR&FEL&Plasma
The possibility to apply PXR radiation mechanism to generate resonant gamma-rays for the Mossbauer experiments – parametric gamma-radiation (PGR) – was suggested quite ago, but experimental conditions for its observation were not discussed before. Besides, the interference conditioned by the electron and nuclear contributions to PGR was not taken into account in the previous consideration. As...
Dr
Dmitry Karlovets
(Tomsk polytechnic university)
26/09/2012, 12:40
Novel sources: PXR&TR&FEL&Plasma
It has recently been discovered theoretically [1] and proved experimentally [2] that free electrons can carry orbital angular momentum being as large as $m \sim 100 \hbar$ [3]. These \textit{twisted electrons} can be considered as massive analogs of the well-known \textit{twisted photons} whose Pointing vector rotates about the direction of their propagation. We consider such an electron with...
Prof.
Hartmut Backe
(Institute for Nuclear Physics)
27/09/2012, 09:00
Channeling Radiation & Related Phenomena
Experiments have been performed at the Mainz Microtron MAMI to explore the radiation emission from a 4-period epitaxially grown strained layer Si-Ge undulator with a period length of 9.9 μm. Electron energies between 190 and 855 MeV have been chosen. In comparison with a flat silicon reference crystal, a broad excess yield around the theoretically expected photon energies between 0.036 and...
Prof.
Victor Tikhomirov
(Research Institute for Nuclear Problems)
27/09/2012, 09:30
Channeling Radiation & Related Phenomena
The history of crystal undulator prediction is reminded, the method of simulation of the radiation from crystal undulators, based on both the realistic particle trajectory simulation and direct consistent integration of the general radiation formula, is outlined and a performance of possible crystal undulator constructions is simulated.
Dr
Andriy Kostyuk
(FIAS & ITP. Frankfurt University, Germany)
27/09/2012, 09:50
Channeling Radiation & Related Phenomena
The present state-of-the-art synchrotron radiation sources are capable for emitting electromagnetic radiation in a wide frequency range up to soft X rays. Moving further, i.e. into hard X ray and gamma-ray band, requires new technologies. One of the most promising ideas is using the phenomenon of charged particle channeling in single crystals.
A single crystal with periodically bent...
Dr
Behnam Azadegan
(Hakim Sabzevari University)
27/09/2012, 10:10
Channeling Radiation & Related Phenomena
We present new Mathematica codes for simulation of planar channeling radiation spectra of relativistic electrons (positrons) channeled along major crystallographic planes of a diamond-structure single crystal. The programs are based on the quantum and classical theory of channeling radiation which have been successfully applied to study planar channeling.
Dr
Oleg Bogdanov
(National Research Tomsk Polytechnic University & Laboratori Nazionali di Frascati)
27/09/2012, 10:30
Channeling Radiation & Related Phenomena
The results of computer simulation of electrons axial and planar channeling in thin tungsten crystal are presented. We calculated trajectories of relativistic electrons, spatial distributions and energy loss due to channeling radiation in the framework of classical electrodynamics using the computer code, developed by authors. Calculations are performed in connection with the experimental...
Prof.
Yury Chesnokov
(IHEP)
27/09/2012, 11:10
Channeling & Crystal Collimation
The report presents an overview the results of IHEP activity in the field of study and using bent crystals to steer high-energy particle beams obtained during 1987-2012. The hardware installed to study crystal beam splitting, collimation and extraction is described. It has been shown that the crystal deflectors developed are capable of sustaining long-term operation to deliver high-energy...
Dr
Walter Scandale
(CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland)
27/09/2012, 11:40
Channeling & Crystal Collimation
Study of crystal assisted collimation has been continued at the CERN SPS for different energies of stored beams using 120 GeV/c and 270 GeV/c protons and Pb ions with 270 GeV/c per charge. A bent silicon crystal used as a primary collimator deflected halo particles in channeling regime directing them into the tungsten absorber. A strong correlation of the beam losses in the crystal and...
A. Tarantin
27/09/2012, 12:05
Prof.
George Smirnov
(CERN)
27/09/2012, 12:20
Channeling & Crystal Collimation
Limitations on application of silicon crystals for collimation of the LHC beams due to crystal damage are considered in the framework of FLUKA Monte Carlo tool.
Dr
Erine Babakhanyan
(National Research Laboratory after A.I. Alikhanian (Yerevan Physics Institute), Armenia)
27/09/2012, 12:40
Channeling Radiation & Related Phenomena
ABSTRACT
The motion of a charged particle in a one-dimensional periodic potential of the Krönig-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...
Prof.
Alexander Potylitsyn
(Tomsk Polytechnic University)
27/09/2012, 16:00
Novel sources: PXR&TR&FEL&Plasma
An electron passing through a counter propagated laser flash can interact with a few laser photons with emission a hard photon in each collision event. In contrast with the well-know nonlinear Compton backscattering (CBS) process where an initial electron “absorbs” a few laser photons and emits one hard photon the above mentioned process may be named as multiple CBS process. Physics of such a...
Mr
Axel Jochmann
(Helmholtz-Zentrum Dresden-Rossendorf)
27/09/2012, 16:30
Novel sources: PXR&TR&FEL&Plasma
Intense ultra-short hard X-ray pulses can serve as a novel tool for structural analysis of complex systems with unprecedented temporal and spatial resolution. With the simultaneous availability of a high power short-pulse laser system it provides unique opportunities for a number of subsequent research steps at the forefront of relativistic light-matter interactions. At HZDR we demonstrated...
Prof.
Levon Grigoryan
(Institute of Applied Problems in Physics)
27/09/2012, 16:50
Novel sources: PXR&TR&FEL&Plasma
The radiation from a relativistic charged particle uniformly revolving along a non-equatorial orbit about a dielectric ball has been investigated. The results of numerical calculations testify that (a) for definite «resonant» values of the particle revolution frequency, and (b) in case of large values of the permittivity of ball material (strontium titanite) an intensive Cherenkov radiation is...
Mr
Mikhail Shevelev
(Tomsk Polytechnic University)
27/09/2012, 17:10
Novel sources: PXR&TR&FEL&Plasma
The report is devoted to the discussion of the nature of Vavilov-Cherenkov effect. This radiation in transparent medium becomes observable under the condition when the phase velocity of its propagating turns out to be less than the velocity of the initial charged particle. The geometry of Vavilov-Cherenkov radiation driven by an electron bunch traveling obliquely in a vicinity of a prismatic...
Prof.
Marco Borghesi
(Queen's University Belfast)
27/09/2012, 17:50
Invited talk
Over the last 10 years the acceleration of ions with high-power lasers has been extensively investigated by many groups worldwide. The main acceleration mechanisms studied in experiments are via electrostatic sheaths set-up at the surface of laser-irradiated foils by relativistic electrons. Beams produced via this mechanism have very different properties from conventional accelerator beams....
Prof.
Danilo Giulietti
(PI)
27/09/2012, 18:20
Novel sources: PXR&TR&FEL&Plasma
Ultra-short Ti:Sa laser pulses at relativistic intensities, propagating in plasmas at densities of the order of 1018-19 el/cm3, can induce accelerating electric fields up to 104 times the maximum fields available in the conventional accelerators. The consequent drastic reduction of the dimensions and costs of the apparatus, open to several applications. In fact, once energetic electron...
Dr
Angelo Schiavi Schiavi
(SBAI Department, Sapienza University of Rome)
27/09/2012, 18:40
Novel sources: PXR&TR&FEL&Plasma
The long running quest for demonstrating ignition and gain in Inertial Confinement Fusion [1] has come to crucial point, where the proof of principle of this approach to fusion energy is within the reach of the scientific community. We present the status of this field of research, both at the international [2] and european level [3], focussing on the experimental activities, on the guiding...
Dr
Vladimir Zvorykin
(PN Lebedev Phys Institute)
27/09/2012, 19:00
The multiple filamentation over very long propagation distances ~ 100 m was measured for peak pulse power exceeding the critical value for λ=248-nm radiation (~108 W) in 2000 times. An all-reflection mirror focusing scheme with a small numerical aperture of about 3 10-4 was designed. The intensity distribution was recorded by using glass plate fluorescence under UV irradiation with imaging at...
Mr
Vyacheslav Malyshevsky
(Southern Federal University, 344090, Rostov-on-Don, Russia)
27/09/2012, 19:20
Poster Session
Dynamic effects that have been recently discovered in the rainbow scattering of neutral atoms from crystal surfaces at grazing incidence are interpreted. It is shown that these features can be explained by the electron drag of scattered atomic particles near the crystal surface.
Prof.
Danilo Giulietti
(PI)
27/09/2012, 19:21
Channeling Primer
LILIA is an experiment of light ions acceleration trough laser interaction with thin metal targets to be done at the SPARC-LAB facility under operation in Frascati. The main goal is to obtain a beam suitable for injection in other accelerating structure. The laser beam and focusing optics parameters available for the first phase of experiments are: beam diameter ≈120mm, ~flat top, M2≈1.5 ;...
Mr
Vladimir Shpakov
(RAS P.N.Lebedev Physical Institute)
27/09/2012, 19:22
Poster Session
New research in acceleration physics leads to growing up the brilliance of charged particles bunches. Existed methods based on interaction of detection devices with bunches do not satisfy our need, because of the fact that new high intensity bunches could damage this devices. Moreover, these methods do not allow analyzing the bunches in real time. Recently new technique based on ODRI (optical...
Dr
Yuichi Takabayashi
(SAGA Light Source)
27/09/2012, 19:23
Poster Session
We propose two new methods (local and remote methods) of measuring electron beam profiles using parametric X-ray radiation (PXR). For the local method, we have demonstrated a proof-of-principle experiment, in good agreement with the results obtained with an ordinary method using a fluorescent screen. For the remote method, we have proposed to use Fresnel zone plates (FZPs) as X-ray lenses. As...
Prof.
Yury Pivovarov
(National Research Tomsk Polytechnic University)
27/09/2012, 19:24
Poster Session
The X-radiation from relativistic channelled electrons at the Bragg angles – Parametric X-Radiation at Channeling (PXRC) – is studied both experimentally and theoretically.
The experiment was carried out using a 255 MeV electron beam from a linac at newly constructed beam line for the study of interactions between a relativistic electron beam and crystals at the SAGA Light Source. The...
Prof.
Toshiro Sakae
(Department of Histology, Nihon Univeristy School of Dentistry at Matsudo)
27/09/2012, 19:25
Poster Session
Using the energy-valuable monochromatic X-ray beam sourced by Parametric X-ray radiation at the Laboratory for Electron Beam Research and Application (LEBRA) of Nihon University, distribution map of Sr in the fossil dinosaur eggshell could be revealed by tracing the X-ray absorption edge. The more advanced and smart element detecting system was built at LEBRA. The new system enabled to detect...
Prof.
Alexey Aleksandrovich Tishchenko
(National Research Nuclear University (MEPhI))
27/09/2012, 19:26
Poster Session
We present a theory of diffraction radiation based on the Smith - Purcell mechanism of the radiation generation from a circularly symmetric photonic wire with one - dimensional periodic dielectric function.
Dr
Vahram Parazian
(Institute of Applied Problems in Physics)
27/09/2012, 19:27
Poster Session
We consider the forward transition radiation generated by a monoenergetic electron bunch in a dielectric plate in presence of ultrasonic waves. The expression for the spectral-angular distribution of the radiation intensity is given for the general case of electrons distribution in the bunch. Various special cases are discussed and the coherence effects are investigated. Conditions are...
Dr
Luca Marchitto
(Istituto Motori- IM)
27/09/2012, 19:28
Poster Session
In this work the results of numerical computation applied to X-ray absorption by fuel sprays are reported. A radiation source of Cu K X-ray tube in combination with a polycapillary halflens has been simulated with the emerging radiation impacted on a CCD detector. A 3D software reproduces both parallel and low divergent X-ray beams irradiating the samples of various shapes and different...
Dr
Yuji Oishi
(INFN(PI), CRIEPI)
27/09/2012, 19:29
Poster Session
X-ray generation by tribocharging is currently an attractive issue. C.G.Camara et al showed that x-rays can be generated by only peeling adhesive tape in vacuum without external electrical high-voltage power supply and demonstrated radiography of human fingers using this unique x-ray source. The X-ray emission, in this scheme, is interpreted as Bremsstrahlung radiation from electrons which are...
Mr
Azamat Ligidov
(National Research Nuclear University "MEPHI")
27/09/2012, 19:30
Poster Session
This report describes research work on studying and testing the enhanced harmonic generation at FEL machines by external amplified signal of high harmonics generated in a gas to be applied to the SPARC accelerated electron beam. The aim is to investigate how the presence of the reinforcing laser radiation affects the motion of electrons and its characteristics. The task of this work is to...
Dr
Ashot Gevorkyan
(Institute of Informatics and Automation Problems, NAS RA)
27/09/2012, 19:31
Poster Session
The formation and governing of periodically modulated refractive index in medium is a most important problem of solid state physics and material science. First of all it is related to the possibility of developing compact UV or X-ray Free-Electron Lasers (FEL) based on emission of transition radiation (TR).
Currently the following two problems are discussed intensely:
a. A gas-plasma...
Prof.
Alpik Mkrtchyan
(Institute of Applied Problems of Physics NAS RA)
27/09/2012, 19:32
Poster Session
By the method of solving the noncorrect inverse problem is explored the influence of controlling parameters on the formation of acoustoplasma emission radiation lines and is determined the operating parameters of acoustic vibrations. With the help of experimental measurements of current and voltage values the parameters of acoustoplasma in a discharge tube are determined.
Mr
Artur Movsisyan
(Institute of Applied Problems of Physics NAS RA, Yerevan, Armenia)
27/09/2012, 19:33
Poster Session
The aim of this work is to show the advantages of monochromatic X-ray beam obtained by the acoustic monochromator (AM) with respect to X-ray beam obtained by the Bragg monochromator. On the basis of the AM, X-ray detector and a goniometer with two heads, developed at the Institute of IAPP NAS RA, and using only usual (old) diffractometers X-ray tube, an automated diffractometer for structural...
Mr
Alexsandr Ponomarenko
(National Research Nuclear University «MEPHI»)
27/09/2012, 19:35
Poster Session
Cherenkov radiation arising when electrons pass through the hole (channel) in a target is known to be a very good source of THz radiation. In this work we explore theoretically the situation when internal radius of the channel is periodically changed. In this case Smith-Purcell radiation is added to the Cherenkov one. The expressions obtained coincide with the known ones in case of usual...
Dr
Alexey Tishchenko
(National Research Nuclear University "MEPhI")
27/09/2012, 19:36
Poster Session
Polarization radiation from a relativistic charged particles bunch is considered at its oblique incidence onto amorphous target. The spectral-angular characteristics of both Cherenkov and transition radiation are explored at the X-ray frequencies. It is shown that for forward radiation the peaks both transition and Cherenkov (near the absorption lines) exist, whereas for backward direction...
Prof.
Alpik Mkrtchyan
(Institute of Applied Problems of Physics NAS RA)
27/09/2012, 19:37
Poster Session
Changing of the emission spectrum of the first positive system of nitrogen is obtained in nitric low-pressure acoustoplasma (<1 torr) at a discharge current modulation. The intensity of all lines of the first positive system of nitrogen decreases, while the intensity of the line of doubly ionized nitrogen atom N II at 0,6482 micron is increasing significantly. Because the ionization potential...
Dr
Sergey Uglov
(Tomsk Polytechnic University)
27/09/2012, 19:38
Poster Session
Experimental setup on the base of 5.7 MeV microtron for investigation of the radiation in the ultrasoft X-ray and vacuum ultraviolet region generated at incidence of relativistic electrons on the surface of a multilayer X-ray mirror is described. The results of the first test experiments carried out for observing the contribution of parametric radiation in generated X-rays are also presented.
Dr
Sergey Uglov
(Tomsk Polytechnic University)
27/09/2012, 19:39
Poster Session
In this work the energy dependences of the spots and bands in angular patterns of X-rays generated by 20-35 MeV rechanneling electrons in a 2 mm thick Si crystal are presented. It is shown that such a complicated “background” additional to ordinary bremsstrahlung must be taken into account at studying of X-ray generation in periodic structures created on crystalline substrates because in the...
Prof.
Aleksandr Potylitsyn
(Tomsk Polytechnic University)
27/09/2012, 19:40
Poster Session
The interference pattern obtained by two diffraction radiation (DR) beams from two shifted targets may be used to determine the length of ultra-short electron bunches.Recently there was established the flexible coherent diffraction radiation interferometry scheme at the SINAP accelerator facility. Here we report the results of the first measurement of the electron bunch length down to...
Prof.
Sergei Kukhlevsky
(University of Pecs)
27/09/2012, 19:41
Channeling Primer
An experimental set-up has been developed at University of Pecs to generate plasma based waveguides for acceleration of electrons by the Hungarian Extreme Laser Infrastructure (ELI). The present study is focused on the theoretical analysis and experimental adjustment of the most critical parameters of the hydrogen-plasma generator that uses the so-called C-C excitation scheme for creation of a...
Dr
Alexander Shchagin
(Kharkov Institute of Physics and Tecknology)
27/09/2012, 19:42
Poster Session
Emission of parametric X-ray radiation by relativistic charged particle is considered as a result of conversion of virtual quanta accompanying the relativistic charged particle moving in a crystal to real ones. A simple expression for conversion coefficient is obtained. Conditions when the coefficient value can exceed the unity are found.
Dr
Gennady Kovalev
(UofM)
27/09/2012, 19:43
Poster Session
The total cross section for the wave scattering by prolate spheroid is compared with the traditional approach of solving the similar problem of scattering by atomic chain.
We show that a set of piecewise continuous spheroidal coordinates and corresponding spheroidal functions can be a powerful tool for wide class of scatterers, in particular: cylinders with polygon profiles and 3D...
Dr
M.A. Aginian
(Yerevan Physics Institute)
27/09/2012, 19:44
Poster Session
Analytical and numerical results on the coherent parametric X-ray radiation (CXPXR) produced by microbunched beams passing through the crystalline planes of single crystals under certain conditions are obtained. Despite the expectations the preliminary results for ultrarelativistic particles obtained in first approximation under certain assumptions show that the intensity of CXPXR is lower...
Dr
L. Bobb
(John Adams Institute at Royal Holloway, Egham, Surrey, United Kingdom)
27/09/2012, 19:45
Poster Session
Diffraction radiation (DR) is produced when a relativistic charged particle moves in the vicinity of a medium. The electric field of the charged particle polarizes the target atoms which then oscillate, emitting radiation with a very broad spectrum. The spatial-spectral properties of DR are sensitive to a range of electron beam parameters. Furthermore, the energy loss due to DR is so small...
Dr
Sergio Bartalucci
(INFN Laboratori Nazionali di Frascati)
27/09/2012, 19:46
Poster Session
In ordered crystal lattice very strong influence of crystal axes and planes electrical field on motion and interaction of fast charged particles with crystal atoms and nuclei exists. In works [1,2] it was shown that in monocrystal targets like possibility of fusion process with the participation of both target nuclei (e.g. ) and beam of fast nuclei (e.g. ), directed at Lindhard angle,...
Dr
Alexey Dik
(PN Lebedev Phys Institute, Moscow)
27/09/2012, 19:47
Poster Session
Researches of the last years showed that interaction of intense ultrashort laser impulses with plasma can be a source of compact bunches of electrons as well as of powerful high- energy electromagnetic radiation. Due to the high gradient of the field of a laser, impulse electrons can be accelerated till the speeds close to the light velocity. Plasma waves being formed behind a laser impulse...
Dr
L. Rinolfi
(CERN)
28/09/2012, 09:00
Novel sources: PXR&TR&FEL&Plasma
The CLIC (Compact Linear Collider), as future linear collider, requires intense positron source. For the baseline configuration, it assumes unpolarized beams. A conventional scheme, with a single tungsten target as source of e-e+ pairs, has been studied several years ago. But, in order to reduce the beam energy deposition on the e+ target converter, a double-target system has been studied and...
Prof.
Robert Chehab
(Institut de Physique Nucleaire de Lyon)
28/09/2012, 09:30
Novel sources: PXR&TR&FEL&Plasma
At GeV incident electron energies on axially oriented crystals, channeling radiation is providing a powerful source of photons ; these photons generate a large number of e+e- pairs in a converter. The hybrid positron source associating a crystal-radiator and an amorphous converter, with a bending magnet in between, looks interesting for the deposited energy and its density in the amorphous...
Dr
Alexey Tishchenko
(National Research Nuclear University "MEPhI")
28/09/2012, 09:50
Novel sources: PXR&TR&FEL&Plasma
A theoretical analysis of the X-ray radiation emitted at the interaction of an ultra-relativistic particle with periodical structures is given. Two types of periodical target are considered: a thin crystalline plate and a diffraction grating consisting of strips. For the first case the analogous of parametric X-ray radiation in the geometry of diffraction radiation is explored. For the...
Dr
Gennady Naumenko
(Tomsk Polytechnic University)
28/09/2012, 10:10
Novel sources: PXR&TR&FEL&Plasma
We demonstrate a type of composite meta-materials, which is constructed by combining thin copper wires and split ring resonators on the same board. Using the analysis of the phase delay of one-dimensional structures of meta-material, we reached the optimal structure parameters. Using the optimized target parameters we had investigated the orientation-angular dependence of radiation refraction...
Ms
Elena Fiks
(National Research Tomsk Polytechnic University)
28/09/2012, 10:30
Novel sources: PXR&TR&FEL&Plasma
The calculations of Cherenkov radiation (ChR) angular distributions from relativistic heavy ions (RHI) with very high energies (from 30 GeV/u up to 3000 GeV/u) taking into account their stopping in a radiator are performed for the first time. The results of this work may be used in developing of new experimental proposals on studies of the ChR angular distributions from RHI beams at modern...
Dr
Leonida Gizzi
(ILIL, Istituto nazionale di Ottica, CNR, Pisa, Italy and INFN, Sezione di Pisa, Italy)
28/09/2012, 11:10
Novel sources: PXR&TR&FEL&Plasma
Laser-plasma acceleration of electrons is currently being explored worldwide as a possible future alternative to conventional accelerators.
In the mean time, existing approaches for accelerating electrons at relativistic energies using compact schemes and relatively high power lasers are being considered for a range of studies aiming at fundamental and applied research.
Among these, the...
Dr
Massimo Ferrario
(INFN LNF)
28/09/2012, 11:40
Novel sources: PXR&TR&FEL&Plasma
A new facility named SPARC_LAB (Sources for Plasma Accelerators and Radiation Compton with Lasers and Beams) has been recently launched at the INFN National Labs in Frascati, merging the potentialities of the old projects SPARC and PLASMONX. The test facility is now completed, hosting a 150 MeV high brightness electron beam injector which feeds a 12 meters long undulator. Observation of FEL...
Paolo Valente
(ROMA1)
28/09/2012, 12:00
Novel sources: PXR&TR&FEL&Plasma
The DAFNE beam test facility (BTF) has been operating successfully for ten years. The electron(positron) 50-750(550) MeV beams can also produce a tagged photon (Bremsstrahlung) beam and a neutron photo-production source (n@BTF) is under characterization. In addition to detector and beam diagnostics tests, the positron beam (down to 2 mrad divergence, 2 mm transverse rms size) has been also...
28/09/2012, 12:20
Novel sources: PXR&TR&FEL&Plasma
Gamma Resist (γ-Resist) is the name of a new proposed experiment to be hosted at INFN laboratories in Frascati. The purpose of the experiment is to set up an all optical γ-ray source driven by Thomson/Compton scattering between laser plasma generated electrons and a counterpropagating laser pulse. The 250 TW FLAME laser will be used to drive the whole process. Compactness, tunability and...
G. Dattoli
28/09/2012, 12:35
Mkrtchyan Artak Henrik
(Institute of Applied Problems of Physics NAS RA)
28/09/2012, 12:55
Mr
Denis Nikitin
(Lomonosov Moscow State University, Faculty of Physics, Russia, 119991, Moscow, GSP-1, 1-2 Leninskiye Gory)
Poster Session
Fullerenes with atomic and molecular compounds inside have been of great interest recently due to their application e.g. in drug delivery systems. However it should be noted that atoms encapsulated in fullerenes undergo the impact of fullerenes’ electron shells, which causes deformation of atoms, i.e. contraction or expansion. In such cases relative deformations may vary from portions to tens...
Dr
Artak Mkrtchyan
(Institute of Applied Problems of Physics NAS RA)
In the work [1], for the first time the phenomena of transition of thermal neutrons from transmission to the reflection direction has been experimental obtained. The phenomena investigated for the neutrons diffracted on atomic planes of quartz single crystal under the influence of temperature gradient.
In this work the results of investigations of thermal neutrons scattering on quartz single...
Mr
Sergii Trofymenko
(Akhiezer Institute for Theoretical Physics of NSC KIPT)
Coherent Bremsstrahlung
Dr
Evgeny Bessonov
(Lebedev Physical Institute RAS)
The derivation of Lorentz Transformations (LT) based on the Principle of Relativity and dependence of the rate of clocks tick (time dilation) on their velocity is presented. The analysis of different ways of the LT derivation allows to look at LT and their consequences from different standpoints, to make them more accessible to a wide circle of readers interested in the relativistic physics...
Dr
Edward Tsyganov
(UTSWMC)
The experiment on registration of low-energy electrons which occur after the fusion reaction of two deuterons in the palladium crystal at very low excitation energies was modeled using Monte Carlo simulations.
Dr
Sergii Fomin
(National Science Center "Kharkov Institute of Physics and Technology")
Novel sources: PXR&TR&FEL&Plasma
A great interest for the future power engineering presents the development of new concepts of nuclear fission reactors with the so-called intrinsic safety, in which the development of uncontrolled chain nuclear reaction is impossible due to the physical principles of their operation. One of such concepts, proposed by Lev Feoktistov in 1988, is based on the phenomenon of self-sustained...
Dr
Alexander Taratin
(Joint Institute for Nuclear Research)
Model for simulation of the crystal assisted collimation of the SPS beam halo and simulation results are presented. The impact parameters and angles of halo particles in the first hits with the crystal primary collimator are considered taking into account the measured oscillation amplitude growth. The model of the crystal with a miscut angle was developed. It was shown that the miscut angle of...
Valeri Vardanyan
(ANL (Yerevan Physics Institute) Foundation)
The radiation characteristics of the electron bunch spontaneous radiation are obtained in irregular microundulator, where the radiation line width is conditioned by the irregularity. In the hard frequency region the spectrum is drastically changed due to the irregularity. In this case the linear gain of the stimulated radiation is conditioned by the distribution of the field sources and is...
