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Sultan Dabagov (Istituto Nazionale di Fisica Nucleare)04/06/2023, 17:00
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Prof. Francesco Costa04/06/2023, 17:20invited
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Dr Giovanni Mazzitelli (Istituto Nazionale di Fisica Nucleare)04/06/2023, 17:45invited
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Sultan Dabagov05/06/2023, 09:00invited
Channeling is the phenomenon well-known in the physics world mostly related to the motion of the beams of charged particles in aligned crystals. Since the beginning of 1970s channeling of high-energy leptons (electrons/positrons of several MeV up to hundred GeV energies) and hadrons (protons/ions of tens GeV up to several TeV energies) has been applied at various famous world research centres...
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Andrea Mazzolari, Alexei Sytov05/06/2023, 09:30
Crystal-based extraction using a bent crystal has been already applied at several high-energy hadron accelerators, but has never been applied for electrons. However, this technique can be very promising for synchrotron light sources and for existing and future lepton collider projects as well for nuclear and particle physics detectors and generic detector R&D and in many projects in...
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Viktar Haurylavets05/06/2023, 09:50
In this work we propose a relatively simple model for taking into account the medium crystallinity in GEANT4. The model includes a simplified method for crystallinity description by changing cross-sections of the physical processes without microscopic motion simulation of the charged particles in channeling mode. The cross-sections for processes of Bremsstrahlung and the electron-positron pair...
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Alexei Sytov05/06/2023, 10:10
The design of innovative applications of electromagnetic interactions of charged particles interactions with oriented crystals in accelerator physics, detector physics, astrophysics, nuclear physics and radiation therapy requires extensive and reliable simulation tool to simulate in details all the experimental setup. Therefore, the implementation of the physics of channeling and radiation in...
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Philippe Schoofs05/06/2023, 10:30
In recent years, bent crystals have become a mature technology now exploited in several applications at CERN, such as shadowing techniques to reduce particle losses during slow extraction from the SPS as well as crystal-assisted collimation for LHC ion runs. Looking forward, they are also a key component of future plans to measure the electric and magnetic dipole moments of short-lived...
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Andrey Solov'yov05/06/2023, 11:10
Andrey V. Solov'yov
MBN Research Center, Altenhöferallee 3, D-60438 Frankfurt am MainTECHNO-CLS project aims at the breakthrough in technologies needed for designing and practical realisation of novel gamma-ray Light Sources (LS) operating at photon energies from ~100 keV up to GeV range that can be constructed through exposure of oriented crystals (linear, bent and periodically bent) to...
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Riccardo Negrello05/06/2023, 11:40
In this work we report the observation of sub-GeV electrons deflection and radiation emission in ultrathin silicon crystals, bent along (111) planes, at the MAinzer Mikrotron (MAMI). The crystal length of $15 \mu m$ was chosen to be comparable with the dechanneling length of electrons. Firstly, at the fixed energy of 855 MeV, the channeling efficiency, the dechanneling length, the volume...
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Alexander Shchagin05/06/2023, 12:00
The frequencies of radiation of relativistic particles in periodical crystalline structure are considered. The threshold character of the radiation is discussed. This project has received funding through the MSCA4Ukraine project, which is funded by the European Union.
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Pietro Monti-Guarnieri, Matthew David Moulson05/06/2023, 12:20
In the last few years, the STORM collaboration has studied the Strong Field regime in a variety of crystals of interest for the development of innovative electromagnetic calorimeters (such as 0.5 - 4.6 X0 PbWO4). In all the tested samples, a large reduction of the effective radiation length has been observed. This contribution will describe the results, obtained by the STORM collaboration,...
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Kirill Sagan05/06/2023, 12:40
The study aimed to conduct dynamics calculations, considering collective effects in a storage ring for a compact monochromatic radiation source in the X-ray range based on Compton backscattering. The calculation focused on various instabilities and collective effects, including microwave instability, coherent synchrotron radiation (CSR), instability of transverse coupled modes, space charge,...
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Luca Serafini05/06/2023, 16:00invited
We report our recent study on the transition between Compton Scattering and Inverse Compton Scattering (ICS), which is characterized by an equal exchange of energy and momentum between the colliding particles (electrons and photons). This regime has been called Symmetric Compton Scattering (SCS) and has the unique property of cancelling the energy-angle correlation of scattered photons, and,...
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Francesca Pofi, Gianluca Cavoto05/06/2023, 16:30oral
We present the latest results from the ANDROMeDa (Aligned Nanotube Detector for Research On MeV Darkmatter) project, which was funded with 1MEur PRIN grant by the italian Ministry of Research (MUR). The main objective of ANDROMeDa is the development of the Dark-PMT, a novel light Dark Matter (DM) detector based on vertically-aligned carbon nanotubes. The detection scheme is based on...
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Artak Mkrtchyan05/06/2023, 16:50oral
In laboratory nitrogen acoustoplasma at pressures from several hundred to several thousand Pa, strong emission lines of molecular nitrogen were obtained at forbidden transitions at 654.81 and 658.36 nm. Strong emission lines were observed both in pure nitrogen acoustoplasma and in a CO2 :N2:He = 1:1:8 laser mixture. In the laser mixture, the emission at the forbidden transition was up to 17...
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Alexander Shchagin05/06/2023, 17:10oral
A new method for the experimental study of ionization loss of relativistic negatively charged particles moving in a crystal in the channeling regime using a semiconductor surface-barrier detector with smoothly tunable thickness of the depleted layer is proposed. The ionization loss can only be measured in the depleted layer of the detector. The thickness of the depleted layer in a flat...
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Dmitrii Gavrilenko05/06/2023, 17:30oral
The Coulomb field of the charged particle in the medium is known to be
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shielded, due to the response of the material. In this research, we
show that, unexpectedly, for the relativistic charge moving inside the
medium it is possible that at certain conditions the Coulomb field
will be enhanced rather than weakened! This phenomenon is predicted
theoretically; we also simulated this process... -
35. Excitation of a giant dipole resonance by radiation of channeled electrons in a Si (110) crystalNikita Ashurko05/06/2023, 18:10poster
The study of giant dipole resonance (GDR) as a collective nuclear excitation [1] is a relevant area of theoretical and experimental research. GDR was first observed in the experiments on the braking γ-beam (bremsstrahlung - BS) [2]. Interest in this fundamental phenomenon does not weaken in our days [3].
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Channeling radiation (CR) of electrons in crystals has been studied in detail [4] and... -
Alexey Dik05/06/2023, 18:11poster
Based on solution of Dirac equation, the dynamics of a quantum particle with a half-integer spin in the field of an arbitrary inhomogeneous electromagnetic wave has been analyzed. It is shown that, in the first order of expansion in longitudinal energy, the effective interaction potential of a fermion coincides with that of a scalar particle, while the spin features of interaction in this...
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Alexey Dik05/06/2023, 18:12poster
We have considered the motion of a nonrelativistic charged particle near flat solid surface at sliding angles based on the result of work [S.B. Dabagov and A.V. Dik, "Surface channeling of charged and neutral beams in capillary guides.", Quantum Beam Science, 6(1), 2022.] devoted to the analysis of a nonrelativistic charged particle motion in a cylindrical single capillary. The interaction...
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Alexey Dik05/06/2023, 18:13poster
The interaction of particles in the channeling regime with crystal lattices has a number of features that allow controlling charged particle beams [Edouard N. Tsyganov, "Some aspects of the mechanism of a charge particle penetration through a monocrystal.", FERMILAB preprint, 1976.], as well as obtaining high-energy electromagnetic radiation [M.A. Kumakhov, "On the theory of electromagnetic...
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Mr Matthew Dickers05/06/2023, 18:14poster
Crystal-based Light Sources (CLS) offer a novel method to produce sources of gamma-rays. Making use of the channelling phenomena, ultra-relativistic charged particles are directed through bent crystals to produce synchrotron-like radiation. These bent crystals are produced by doping a base crystal, thus changing the crystalline inter-planar distances.
In this preliminary study we conduct...
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Dmitrii Gavrilenko05/06/2023, 18:15poster
Generalized theory of Compton backscattering in terms of luminosity, suitable for both classical and quantum regimes obtained. Optimal parameters, which require a certain mutual orientation and inclination of the fronts of the laser and electron beams described by 3D Gaussians, correspond to the crab scheme. The scattering of diverging beams was also considered. The constructed theory not...
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Vladimir Maisheev05/06/2023, 18:16poster
A series of experiments demonstrated the possibility of focusing positively charged particles using focusing crystals. In these experiments, between a crystalline focusing crystal and the position of the focus was a space free from magnetic fields. In this work, we consider an important case from the point of view of practical aither dipole or quadrupole.se when between the focusing crystal...
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Mykola Maksyuta05/06/2023, 18:17poster
The paper shows that when beams of non-relativistic protons are channeled along the axes of carbon nanotubes (non-chiral nanotubes of the type are chosen, in which the chains of carbon atoms are located in the corners of a regular 2n-gon), the formation of fast directed beams of neutral hydrogen atoms is possible. Consideration of such a mechanism is carried out using the non-stationary...
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Mr Alexander Popov, Dr Anastasia Dimitrieva, Dr Andrew Shemukhin, Anton Stepanov05/06/2023, 18:18poster
The combination of chemical and physical processes is the main mechanism of the CNTs' bactericidal action. The mechanism of the antibacterial effect of nanomaterials has not been sufficiently studied to date. Changing the structure of carbon nanomaterials by ion beams allows one to adjust their electrical and magnetic properties, vary the thermal conductivity of individual carbon nanofibers,...
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Dr Oleg Bogdanov05/06/2023, 18:19poster
The twisted photon is the electromagnetic wave carrying the orbital angular momentum (OAM). Various schemes of production of the twisted photons have been proposed recently. The undulators and free electron lasers are used in these schemes. High energy twisted photons can also be generated by parti-cles channeled in aligned crystals.
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In our previous work We described planar channeling... -
Mykola Maksyuta05/06/2023, 18:20poster
Using the energy levels and corresponding wave functions found for hexagonal crystals of Be, Sc, Ti, Co, Zn, Y, Zr, Ts, Ru, Cd, and La, the spectra of channeled spontaneous radiation are calculated in the dipole approximation for nondispersive relativistic positron beams moving at zero angles with respect to the c-axes. Analysis of the dependencies shows that the intensity maxima of spectral...
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Dr Luca Giannesi06/06/2023, 09:00
The injection of a seed to initiate the FEL amplification in a free electron laser is a concept initially introduced to improve the source spectral brightness. This concept was first demonstrated at BNL (USA). A few experiments carried out later have shown the possibility to extend the method to reach VUV wavelengths and FERMI was built as a facility exploiting these methods to provide to...
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Alexei Sytov06/06/2023, 09:30
Plasma wakefield acceleration in oriented structured solids (nanotubes and crystals) has a potential of extremely high acceleration gradients exceeding 1 TeV/m. One can exploit the nuclei-free space in nanotubes and crystals both to produce plasma waves and to accelerate channeling particles being contained within their channel and moving almost without collisions with ions.
In this work we...
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Vladimir Maisheev06/06/2023, 09:50
Recently the effect of reduction of multiple scattering of positively charged particles was observed at channeling in bent (111) and (110) planes of silicon. The effect is observed in the plane orthogonal to the bending plane. The degree of reduction of rms scattering angle channeling particles (in comparing with equivalent amorphous media) reached up to 8 times. The analytical theory of...
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Marco D'Andrea06/06/2023, 10:10
The concept of crystal collimation exploits the peculiar properties of crystalline materials to deflect high-energy beam halo particles at angles orders of magnitude larger than what can be achieved with scattering by conventional materials used as primary collimators. This innovative technique is planned to be used to improve the collimation efficiency with heavy-ion beams at the Large Hadron...
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Eric David Bosne06/06/2023, 10:30
Electron Emission Channeling is a technique used for the measurement of the lattice location of radioactive isotopes implanted into single crystals. This work reports on how a Timepix3 detector was installed in the experimental setup and the resulting advantages of doing so. It also reports on the data analysis and software updates that were necessary to accompany the increase in data, and...
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Robert Chehab06/06/2023, 11:10
Crystal effects and especially channeling radiation are interesting, instead of bremsstrahlung, to provide a large number of photons,for positron generation in converters This work is describing the choice , more and more, spread , of axially oriented crystals in channeling conditions to provide such amount of photons . Emphasis is put on a particular scheme, the hybrid source, associating a...
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Robert CHEHAB06/06/2023, 11:40
Hybrid positron sources using a crystal axially oriented as a photon radiator followed by an amorphous converter are promising for the yields as for the behaviour with thermal stresses. Emphasis is put on the advantages of using a granular converter made of small spheres instead of a bulk material for the photon conversion into e+e- pairs.
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61. Experimental Demonstration of Super-radiant Emission of Coherent Cherenkov Diffraction RadiationPavel Karataev06/06/2023, 12:00
Recent years have witnessed an intense development of accelerator-based sources generating radiation from radiowaves to hard X-rays. Intense electromagnetic radiation in the far‐infrared spectral range is an advanced tool for scientific research in biology, chemistry, and material science because many materials leave signatures in the radiation spectrum. Monochromatic lines in the spectrum...
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Vardazar Kotanjyan06/06/2023, 12:20
We investigate the radiation of surface polaritons by a charged particle
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moving parallel to the axis of a dielectric cylinder immersed in homogeneous
medium. Both the cases of the charge motion inside and outside the
cylinder are discussed. The electromagnetic fields in the exterior
and interior media are evaluated by using the Green tensor. The parts
in the fields corresponding to... -
Alexander Shchagin06/06/2023, 12:40
A.V. Shchagin
Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
Kharkov Institute of Physics and Technology, Academicheskaya 1, Kharkiv 61108, Ukrainee-mail: alexander.shchagin@desy.de
Deflection of a relativistic electron beam by means of the pyroelectric deflector is demonstrated experimentally for the first time [1]. The operating principle of the...
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Giuseppe Dattoli06/06/2023, 16:00
Sources of free electrons coherent radiation, be they FEL or CBS devices, are undergoing a continuous demand of improvement of the relevant output performances.
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These laser-like tools are widely used all over the world and are the highest performing in terms of brilliance, mono-chromaticity, coherence, directionality and polarization control. However in spite of their undoubted success and... -
Vyacheslav Dyubkov06/06/2023, 16:30
Today, a compact monochromatic radiation source in the X-ray range based on inverse Compton scattering is being constructed in MEPhI. The source will be based on linear standing wave accelerator of electrons and compact o-shape magnetic channel (accumulator ring). The features of collective effects in the ring are studied. The thresholds of longitudinal microwave instability and transverse...
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Vladimir Vysotskii06/06/2023, 16:50
The traditional interpretation of the channeling phenomenon is associated with the possibility of transporting particle or radiation beams over long distances without dissipation in specially ordered or focusing systems. It is shown that a similar process of quasi-channel motion with complete self-suppression of absorption and scattering can be realized for a weak (small in amplitude)...
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Levon Grigoryan06/06/2023, 17:10
The results of experimental observation of coherent Cherenkov radiation from picosecond electron bunches traveling along the axis of a hollow cylindrical dielectric loaded waveguide are presented. Experiments are provided on the linear accelerator AREAL of CANDLE laboratory in Yerevan. The angular distribution of radiation from 3.7 MeV electron bunches passing through cylindrical quartz sample...
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Anush Sargsyan06/06/2023, 17:30
The results of theoretical studies of the spectral and angular distribution of radiation
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generated by a train of electron bunches crossing a dielectric ball are presented. The
numerical results are given for a dielectric ball made of Quartz, Teflon, or Strontium
titanate. It is shown, that strong peaks can appear in the spectral distribution of the
radiation intensity for certain values of... -
Sergei Stuchebrov06/06/2023, 18:10poster
Nowadays, modulation of the electron beam depth dose distributions in radiation therapy sessions is provided by sets of tissue equivalent plates or individually shaped thermoplastic boluses.
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In this study we propose to use 3D printed samples for depth dose distribution modulation in electron radiotherapy. This approach allows producing patient-specific boluses and compensators. The aim of... -
Angelina Bulavskaya06/06/2023, 18:11poster
This study describes the concept of a method for the measurement of flux density distribution in the transverse plane of wide-aperture beams such as radiotherapeutic medical beams. Currently, various approaches are used to modulate a radiation field of photons, electrons, protons and ions. However, all of these methods require continuous monitoring of the dose and spatial parameters of the...
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Hrant Khachatryan06/06/2023, 18:12poster
The Cherenkov radiation from train of electron bunches traveling along the axis of a partially dielectric loaded cylindrical waveguide is investigated theoretically. It is shown, that by special choice of the values of problem parameters, it is possible to generate quasi-coherent radiation from bunches in a train, on several waveguides modes simultaneously. A visual explanation of the obtained...
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Andrey Oleinik, Pavel Karataev06/06/2023, 18:13poster
The change in temperature of single crystals in vacuum conditions, such as lithium tantalate (LiTaO3), gives an attractive possibility to generate and accelerate electron and positive ions fluxes up to 100 keV and more. Also, the generation of X-ray and neutron fluxes in this way is very productive. The conception of a pyroelectric accelerator implies a compact device, which does not require...
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Mr Karen Yeghiazaryan06/06/2023, 18:14poster
This work is devoted to the problem of acceleration of ions of various atoms in a liquid medium. This work is a continuation of the series of experimental studies carried out at the Institute of Applied Problems of Physics (IAPP) of the National Academy of Sciences (NAS) of the Republic of Armenia since the beginning of the 90s of the last century.
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In order to conduct experimental studies, a... -
Dr Samvel Mkhitaryan06/06/2023, 18:15poster
A desktop universal device for X-ray interferometric diagnostics of structural imperfections in single crystals was developed, created and tested. The proposed device can serve both for scratching the surface of the interferometer crystalline blocks and for bending them in order to generate dislocations in the interferometer blocks using our proposed technology.
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It has been proved that the... -
Alexander Potylitsyn, Mikhail Shevelev, Vahan Kocharyan, Yury Cherepennikov06/06/2023, 18:16poster
Cherenkov effect is well-known phenomenon and finds a broad application in physics including beam diagnostics [1]. Corundum crystals irradiated by charged particles are often used as Cherenkov light source. Corundum radiators may significantly change their optical properties during extensive exploitation with particle beams that would influence Cherenkov light intensity. In this report we...
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Yury Cherepennikov06/06/2023, 18:17poster
Particle and radiation beams are widely used for cancer therapy. In last decades neutron sources are becoming more and more popular for medical applications. One of the most advanced technique for cancer treatment is neutron-capture therapy (NCT). The main feature of this technique is using epithermal and thermal neutrons to create a powerful source of radiation in the human body and...
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piot Philippe06/06/2023, 18:18poster
A pathway to a compact accelerator-based short-wavelength light source consists of scattering a high-power laser pulse off relativistic bright electron beams thereby producing frequency up-shifted photons. This inverse Compton scattering (ICS) process has formed the backbone of gamma- and X-ray-generation at several facilities. In the present paper, we investigate the onset of coherent ICS...
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Stefano Salvatori06/06/2023, 18:19poster
At high energy, the smaller inelastic nucleon-Carbon cross-section implies that diamond has a radiation hardness an order of magnitude higher than that of silicon. The production of high-quality diamond samples grown using the chemical vapor deposition technique paved the way for the use of synthetic diamonds in the fabrication of detectors for both charged particles and photons. Importantly,...
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Marcel Ruijter06/06/2023, 18:20poster
RUIJTER, Marcel (Istituto Nazionale di Fisica Nucleare)
ESPOSITO, Adolfo (Istituto Nazionale di Fisica Nucleare);
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BACCI, Alberto (Istituto Nazionale di Fisica Nucleare);
FAILLACE, Luigi (Istituto Nazionale di Fisica Nucleare);
GALLO, Alessandro (Istituto Nazionale di Fisica Nucleare);
VANNOZZI, Alessandro (Istituto Nazionale di Fisica Nucleare);
GHIGO, Andrea (Istituto Nazionale di... -
LAURA BANDIERA07/06/2023, 09:00
It has been known since decades that the alignment of a beam of high-energy e- or photons with particular crystal direction involves a huge increase of radiation emission or pair production probability, respectively. While crossing an oriented crystal, such penetrating particles experience an electromagnetic field so strong that it leads to a huge enhancement of the e.m. shower development...
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Samvel Mkhitaryan07/06/2023, 09:30
This work is devoted to the problem of acceleration of charged elementary particles and ions in air. This work is a continuation of a cycle of research in a new field of acoustoplasma physics, created by the founder of the Institute of Applied Problems of Physics of the NAS of the RA, Academician A.R. Mkrtchyan.
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For experimental research, in the IAPP NAS RA developed and created unique... -
Hartmut Backe, Werner Lauth07/06/2023, 09:50
A beam line for 500 MeV positrons is under construction at the applied physics area of the Mainz Microtron MAMI. Positrons will be created by pair conversion of bremsstrahlung, produced by the 855 MeV electron beam of MAMI in a 10 m thick tungsten converter target, and energy selected by an outside open electron beam-line bending magnet. - Results of channeling calculations of 500 MeV...
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Hartmut Backe07/06/2023, 10:10
Experiments with the 500 MeV positron beam under construction at the Mainz Microtron MAMI will be proposed to study the (110) channeling process in silicon single crystals. Simulation calculations were performed which are based on the double differential cross-section as function of the momentum transfer q and the energy transfer W to a bound electron. In this framework, also the energy...
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Anton Stepanov07/06/2023, 10:30
Channeling of low-energy ions in carbon nanotubes taking into account many-body effects
A.V. Stepanov, A. S. Sabirov, A. A. Shemukhin
The use of carbon nanotube (CNT) bundles instead of masks has the advantage of allowing the ion beam to be controlled in three dimensions by manipulating the nanotubes. Due to this, it becomes possible to direct the ion beam to hard-to-reach places, for...
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Danilo Giulietti08/06/2023, 09:00invited
Since the early 60s, with the advent of LASERs, it was understood how they could be used to create pulsed X-ray sources of extraordinary brightness. The peculiar characteristics of these sources have progressively been implemented hand in hand with the evolution of laser technologies. In fact, as the duration of the laser pulses became shorter and consequently higher intensities were reached,...
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Vladimir Vysotskii08/06/2023, 09:30
The report discusses the possibility of effective spatially selective and spatially scanning nuclear fusion based on the interaction of low-energy (several keV) channeling particles with the nuclei of crystall planes or axes.
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The physical basis for such a fusion is the formation of a coherent correlated state of these particles at a given location into crystal with the optimal ratio of the... -
Vladimir Vysotskii08/06/2023, 09:50
The report discusses a method for optimizing controlled nuclear fusion in an unstructured target using low-energy particles. The essence of the method is the use of quasi-channeling of such particles in a thin single-crystal film of the graphene type located on the polished surface of this target. Such a motion at an optimum particle energy of 500 eV leads to the formation in this film and in...
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Lusine Aloyan08/06/2023, 10:10
Electron linear accelerators are the primary equipment of a modern radiotherapy department. Current research aimed at investigating the possibility of using ultrashort low emittance electron beam pulses for radiation therapy produced by linear electron accelerator at CANDLE, Armenia. High-energy radiation damages genetic material - DNA of cells and thus killing the cancer cells. The study and...
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Ravi Prakash Yadav08/06/2023, 10:30
We propose and demonstrate a strategy for the design of highly antimicrobial surfaces with vertically aligned carbon nanotubes (VA-CNTs), also known as CNT forests, synthesized by means of an easy, low-cost and fast (~15 min) chemical vapor deposition process (CVD). The resulting VA-CNTs, uniformly covering the underlying growth substrate, are characterized by a high packing density forcing...
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Sara Pettinato08/06/2023, 11:10
Radiation dosimetry for Radiotherapy (RT) is a key element in ensuring treatments efficacy as well as both the safety and the proper management of patients. Accurate dosimeters able to perform precise dose measurements is of pivotal importance for the calibration of the radiation beams, aimed at evaluating their characteristics and validating the treatment plan performed during the...
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Marco Galimberti08/06/2023, 11:40
To stay up to date with the user requirements, two major upgrade project are ongoing at the Central Laser Facility.
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The first project EPAC is aiming to provide a 1PW laser system, 30J in 30fs at 10Hz. A new building has been recently completed and the installation phase is now starting.
The second project Vulcan 20-20 is at the final stage of the approval. The aim is to deliver a 20PW laser... -
Marko Cosic08/06/2023, 12:00
We have investigated long-time dynamics of the quantum carpets occurring in positron transmission through a chiral single-wall carbon nanotube in the channeling mode. We found that the carpet structure depends strongly on the width of the initial wave packet. In the case of the narrow wave packet obtained carpet is periodic and very regular, woven by full and fractional wave packet revivals....
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Majid Ali08/06/2023, 12:20
Changing the temperature of single crystal lithium tantalate (LiTaO3) at moderate vacuum conditions gives an attractive possibility to generate and accelerate electron up to 100 keV. The electrons are ejected either from the crystal or from the target (depending on polarity). The electrons than generate X-Rays via bremsstrahlung and characteristic X-ray emission processes.
Amptek, Inc (USA)...
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Vladimir Zvorykin08/06/2023, 12:40
A narrow (30−40 μm in diameter) capillary-like rippled channel finished by a post-channel crown was observed in 2D hydrodynamic interaction regime of 100J@100 ns KrF laser pulses with a translucent PMMA targets at intensities up to 5×1012 W/cm^2. Channel formation mechanism includes self-consistent laser beam filamentation along UV light penetration depth. The modelling experiments with a...
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Alessandro Scordo08/06/2023, 16:00invited
The INFN Laboratories of Frascati host a sparkling community working on X-ray detection and its possible applications. Among this community, the SIDDHARTA-2 and the VOXES collaborations developed and implied, in the last years, a series of spectroscopic detectors for several purposes, ranging from a few keV to almost 300 keV.
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The SIDDHARTA-2 experiment at LNF exploits the large area of... -
Vahan Kocharyan08/06/2023, 16:30
The problem of dynamic diffraction of X-rays from a point source on the spatial lattice of a crystal with a weak deformation field is considered. Theoretical study is based on the asymptotic representation of the Green-Riemann function for a pair of Takagi-Taupin equations of the hyperbolic type. Experimental studies were carried out on quartz crystals in the presence of a temperature gradient...
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Paolo Plescia08/06/2023, 16:50
Here we present a new line of transportable and portable X-ray instruments. They have been manufactured based on a number of specifications:
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- high sensitivity, low cost, cheap and easily programmable electronics, AI-based software and "open source" platforms
High sensitivity is achieved by adopting INFN polycapillary lenses, in particular a semi-lens for diffraction and a cylindrical lens... -
Luca Marchitto08/06/2023, 17:10
Transportation sector is facing a watershed moment: the need of reducing emission of greenhouse gases imposes radical changes in propulsion systems. Despite the run to powertrain electrification, this goal is far to be realized before 2050. Therefore, more and more attention will be paid worldwide to rich close-to-zero pollutant emissions from future road transportation vehicles.
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Next future... -
Dariush Hampai08/06/2023, 17:30
X-ray applications are widely used in the world. By the way, due to the high interaction between radiation and matter, the possibility to have optical devices suitable for X-ray radiation is not trivial. In the last 30 years, the studies concerning novel advanced material have fostered the development of several solutions for more efficient X-ray lens, necessary to perform high spatial...
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Philippe Piot09/06/2023, 09:00
The demonstration of the reliable operation of an X-band radio-frequency (RF) photoinjector with fields $\sim 0.4$~GV/m [1] on a photocathode provides a pathway to bright electron bunches. This success was enabled by powering the RF gun with short RF pulses thereby mitigating breakdowns and dark-current generation. The ~300-MW RF pulses were generated by decelerating a high-charge relativistic...
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Mihail Antoniu Iliescu09/06/2023, 09:30
The SPHINX project aims building an ultrafast X-ray holographic camera able to record images of microscopic samples and of their internal parts with nanometer resolution. The application is based on a new implementation of the phase-contrast holography that overcomes the main limitations encountered in the current systems (mostly based on absorption-contrast), namely the low energy range, the...
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Nikolay Kalashnikov09/06/2023, 09:50
The channeling effect in a curved single crystal is considered. In an accompanying reference frame moving along a plane or channeling axis at a speed equal to the longitudinal component of the electron velocity, such motion is essentially an implementation of the model of a one-dimensional 1D atom or a two-dimensional 2D atom, and with controllable parameters. The depth and shape of the...
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Rongrong Cai09/06/2023, 10:10
In future heavy-ion runs of the Large Hadron Collider (LHC), the stored beam energy is planned to increase and reach values above 20 MJ. This requires improving the performance of the betatron collimation system. The solution found is to use crystal channeling to reduce nuclear fragmentation and guide halo particles safely to an absorber. Crystal collimation is part of the HL-LHC baseline and...
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32. Feasibility of using the crystal channeling to reduce the beam losses in Slow Extraction at 8GeVVladimir Nagaslaev09/06/2023, 10:30
The mitigation of the beam losses in slow extraction is becoming more and more demanding in accelerator applications for HEP as the beam power is gradually increasing. The successful demonstration of using the proton beam channeling at 450GeV to deflect the beam away from the extraction septa opens the new levels of improving the slow extraction efficiency.
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It is yet to be demonstrated that... -
Marco Garattini09/06/2023, 10:50
The SHERPA (“Slow High-efficiency Extraction from Ring Positron Accelerator”) project aim is to develop an efficient technique to extract a positron beam from one of the accelerator rings composing the DAΦNE accelerator complex at the Frascati National Laboratory of INFN, setting up a new beam line able to deliver positron spills of O(ms) length, excellent beam energy spread and...
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Timur Tukhfatullin09/06/2023, 11:10
The phenomenon of Half-Wavelength Crystal (HWC) channeling, where a particle experiences "mirroring" due to a single collision with a crystallographic plane, has been observed for protons and electrons. While the HWC channeling phenomenon has been observed for 400 GeV protons at CERN-SPS [1] and for 255-MeV electrons at the SAGA-LS Facility [2, 3], there are additional parameters that arise in...
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Sultan Dabagov (Istituto Nazionale di Fisica Nucleare)09/06/2023, 11:30
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Sergey Taskaev
The report describes the accelerator based neutron source VITA that provides beams of protons, deuterons, neutrons, photons, alpha particles and positrons for a wide range of studies, present and discuss the results obtained, and declare plans.
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Sultan Dabagov (Istituto Nazionale di Fisica Nucleare)
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Giovanni Mazzitelliinvited
The Lambda Cold Dark Matter model (LCDM), the General Relativity (GR) and the Standard Model (SM) are today our best interoperation of the universe surrounding us, that since long time have many open questions. Moreover, recent observations in astronomy and astrophysics are strongly changing the theoretical and experimental scenario.
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An overview of today open issues in the astroparticle...
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