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D.A. Poghosyan (Alikhanyan National Scientific Laboratory)
In our previous work, we demonstrated that the natural frequency of the wire's oscillations responds sensitively to changes in the wire material’s structure caused by proton beam irradiation, as well as to loads exceeding the elastic limit and short, high-power electrical pulses. To reliably determine these changes, it is essential to compare the frequencies of the wire used for measurements...
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Lazar Mahtesyan (Institute of Applied Problems of Physics NAS RA)
Existing mechanical methods of helical scanning of recorded signals during continuous analog visible registration complicate the design of analog recorders with continuous visible recording of low-frequency processes and periodic frame output. They reduce their reliability and accuracy, complicate sweep step adjustment, increase power consumption and size, and introduce additional static and...
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Dr Vitali Khachatryan (CANDLE Synchrotron Research Institute)
This study investigates the combination of glass plate irradiation and digital processing of electron beam images to improve the characterization of electron beam transverse profiles and absorbed doses distribution in irradiation experiments. The proposed approach deals with limitations of traditional techniques, namely the absence of real time feedback and insufficient spatial resolution. By...
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Mikayel Ivanyan
Application of dispersion relations to the problem of calculating the radiation field of a particle moving along a helical trajectory in a multilayer cylindrical waveguide.
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M.I, Ivanyan 1*, B. A. Grigoryan1, A. H. Grigoryan1,2, K. Floettmann3, L. Anjo1, L. V. Aslyan1, M. Z. Karalyan1, V.G. Khachatryan1
1CANDLE Synchrotron Radiation Institute, 31 Acharyan Street, Yerevan, Armenia, 0040... -
Kiki Theodorou
Kiki Theodorou,
Professor of Medical Physics, Faculty of Medicine, University of Thessaly, Greece
Chair of Biomedical Physics Dept., Research and Innovation, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi ArabiaArtificial Intelligence (AI) is rapidly transforming the field of medical physics and radiation oncology, offering new paradigms for data-driven,...
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Prof. Mohammed Alkhorayef (King Saud University)
This study evaluated occupational radiation exposure among healthcare professionals working in nuclear medicine departments in Saudi Arabia over a six-year period. Thermoluminecent dosimeters (TLD) were used to quantify annual effective doses (Hp(10)) for a cohort of 32 workers, including nurses, nuclear medicine physicians, medical physicists, and technologists. The mean ± SD annual effective...
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DANILO GIULIETTI
The properties of so-called blackbody radiation are essential for characterizing the ones of any radiating surface. Studies in this field are typically conducted using radiometric methods. This presentation will illustrate a calorimetric method for determining the Stefan-Boltzmann constant and the emissivity of metals at low temperatures, the latter property being of great interest in the...
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Mikhail Shevelev
Cherenkov radiation across different spectral ranges is now an important tool for investigations in experimental radiation physics, charged particle beam diagnostics, nuclear energy and astrophysics. Since the early 2000s, renewed interest in this phenomenon has emerged, driven by advances in metamaterials and photonic crystals – artificial structures with tailored, nontrivial electromagnetic...
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Mikhail Shevelev
In recent years, interest has grown in the study of chiral biological objects composed of helical components with a predominant right-handed (or left-handed) twist. These studies rely on circularly polarized (CP) radiation, typically available in the optical range (via lasers) or X‑ray range (via undulators). Despite the widespread use of THz radiation in medicine and biology, the problem of...
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Mkrtich Minasyan
Comparative Analysis of Neural Surrogate Architectures for Acoustic Wave Propagation in Heterogeneous Media
[M․V․Minasyan][1], Z․H․ Mkrtchyan, A․M․Minasyan
Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia, 25 Hrachya Nersisyan, Yerevan, Armenia, 0014
The...
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Arkadi Soghomonyan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)
In the present work, the results of an experimental investigation and comparative analysis of symmetric and asymmetric reflection of X-ray radiation in quartz single crystals (X-cut) in Laue geometry under the presence of a temperature gradient are presented. The temperature gradient was created perpendicular to the crystal surface normal and, in the symmetric and asymmetric cases,...
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Iurii Shablov (NRC "Kurchatov Institute")
Single-crystal silicon and silicon dioxide remain the primary materials for high-precision mirrors and other components of X-ray and extreme ultraviolet (EUV) optics. A key feature of these elements is the stringent requirement to maintain their complex geometrical shape and high surface smoothness. One of the approaches to reducing surface roughness and shaping substrates for various X-ray...
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161. Contrast Media utilization as a radiation dose reduction tool in computed tomography proceduresAbdelmoneim Sulieman (King Saud bin Abdulaziz University for Health Sciences), Khalid Almethen (King saud bin abdulaziz university for health science), Mohammed Alatiyyah (King Saud bin Abdulaziz University for Health Sciences)
The medical imaging procedures that use ionizing radiation, especially computed tomography (CT), are associated with an increased radiation dose, which raises the lifetime risk of having cancer caused by radiation. Iodinated contrast media (Z = 53) increase X-ray attenuation, especially at lower photon energies, enhancing iodine attenuation and image contrast. This increased attenuation...
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Arthur Margaryan
Acoustoplasma magnetrons (APMs) represent a unique class of devices designed for the precision control of plasma processes. Unlike classical systems, APMs combine the properties of magnetron and glow discharges, allowing them to be utilized across a wide spectrum of applications. One of the most promising areas for APM application is the deposition of thin films.
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A distinctive feature of the... -
Arthur Margaryan
There are materials that are difficult to deposit using thermal methods due to their high operating temperatures, as well as materials that exhibit low efficiency in magnetron sputtering. In such cases, an arc discharge can be used to evaporate the material. Typically, a direct current arc discharge is employed and maintained for a relatively long duration. Evaporation from the overheated arc...
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Alessandro Curcio
Accurate characterization of energy deposition is critical for ultra-intense electron irradiations in advanced radiotherapy and microdosimetry. We investigate the impact of Coherent Stopping Power (CSP) on Very High Electron Energy (VHEE) beams under conditions where electron densities approach or exceed the threshold for collective interactions in matter. Using simulations of...
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Yaroslav Kolesnikov (Budker Institute of Nuclear Physics)
Accelerator based neutron source was proposed, developed and now is intensively using for boron-neutron capture therapy (BNCT), – binary method for the treatment of malignant tumors, and BNCT research related topics, such as testing boron agents for BNCT and developing and implementing methods for dosimetry in BNCT.
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Nowadays, important task in BNCT is to provide a methodology for direct... -
Dr Ibrahim I Suliman (Department of Physics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh)
Background: Interventional cardiology procedures are essential for diagnosing and managing cardiovascular diseases but involve significant patient exposure to ionizing radiation. Effective dose (ED) is a key metric for estimating stochastic risk and enabling comparisons across procedures. Data from Sudan on patient ED remain limited.
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Objective: To estimate patient effective dose during common... -
Mr Karen Aramyan (Institute of Applied Problems of Physics (IAPP) of NAS RA)
A theory of galvanic and thermomagnetic phenomena in thin films with an isotropic energy spectrum is developed, taking into account electron scattering by film surface roughens. Expressions for the components of galvano- and thermomagnetic tensors in films with rough surfaces were found in the presence of a magnetic field perpendicular to the film plane, an electric field, and a temperature...
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Khalid Almethen (King saud bin abdulaziz university for health science)
Introduction: Computed Tomography (CT) is one of the most widely used imaging modalities, but it also significantly contributes to patient radiation exposure. Establishing Institutional Diagnostic Reference Levels (IDRLs) is a crucial step toward optimizing radiation dose and enhancing patient safety. This proposal aims to assess radiation doses in adult CT imaging at King Salman Hospital and...
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Elizaveta Bushmina (Joint Institute for Nuclear Research, Dubna, Russian Federation; National Research Tomsk Polytechnic University, Tomsk, Russian Federation)
Cherenkov diffraction radiation (ChDR) is generated when short bunches of charged particles with relativistic energies pass near dielectric targets, due to the interaction of the particles' Coulomb field with these targets. ChDR is promising for use as a means of non-disturbing diagnostics of high-energy particle beams [1-2], as well as for generating radiation in the terahertz and...
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Dr Sergei Stuchebrov (National Research Tomsk Polytechnic University)
Polarization radiation is widely used for the diagnostic of charged particle beams due to its high sensitivity to various parameters, such as beam shape, bunch length, energy, and angular distribution. Special attention is given to coherent radiation, which occurs when the wavelength of the generated radiation is comparable to or exceeds the length of a single electron bunch. At most modern...
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Николай Максюта
The paper presents the results of a study of the spectral distributions of spontaneous radiation arising from the channeling of relativistic electrons along the main crystallographic axes [100], [110], and [111] of barium titanate, for example, at a temperature of 500°K, when this crystal is in the cubic phase. The analysis was carried out using a methodology similar to that in Ref. [1]. The...
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Vardazar Kotanjyan (postgraduate student)
We investigate the radiation emitted by a charged particle moving along a helical orbit around a
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dielectric cylinder immersed in a homogeneous medium. Formulae are derived for the electromagnetic
potentials, electric and magnetic fields, and for the spectral-angular distribution of the radiation in the
exterior medium. It is shown that under the Cherenkov condition for the dielectric... -
Ibrahim I. Suliman (Imam Mohammad Ibn Saud Islamic University)
Background: CT pulmonary angiography (CTPA) is a highly effective diagnostic tool for detecting pulmonary embolism. However, its increasing use raises concerns regarding patient radiation exposure and cancer risk.
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Methods: This study evaluated the radiation dose and lifetime cancer risk associated with CT pulmonary angiography (CTPA) performed at a major university hospital. DoseWatch was... -
Prof. Sergey Rykovanov
Nonlinear Compton scattering in collisions of relativistic electron beams with intense laser pulses offers a promising route toward compact tunable X-ray and gamma-ray sources. As the laser intensity increases, the radiation spectrum is expected to depart from the linear regime through several characteristic effects, including redshift and broadening of the main spectral line, an increase in...
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Prof. Aram Saharian (Yerevan State University)
We discuss the radiation of surface polaritons that are localized at a cylindrical interface that separates two media with different electromagnetic properties. Charged particles are considered as radiation sources. Different types of trajectories are studied, including rectilinear motion parallel to the axis of the dielectric cylinder and circular motion around or inside the cylinder. The...
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Mikayel Ivanyan
Geometric Resonance in an Open Dielectric Waveguide
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M.I, Ivanyan 1*, B. A. Grigoryan1, V.G. Khachatryan1, A. H. Grigoryan1,2, K. Floettmann3, L. Anjo1, M. Z. Karalyan1, L. V. Aslyan1
1CANDLE Synchrotron Radiation Institute, 31 Acharyan Street, Yerevan, Armenia, 0040
2Yerevan State University, 1 Alex Manoogyan Street, Yerevan, Armenia, 0025,
3Deutsches Elektronen-Synchrotron DESY,... -
ANES ABDESSAMED BOUTAHRA (Batna 1 University)
The accurate assessment of natural radioactivity in thermal waters is often limited by low activity concentrations and the sensitivity of detection systems. Improving detection limits is therefore essential for reliable environmental monitoring and radiological evaluation.
In this study, sixteen thermal water samples were collected from various hot spring sources in eastern Algeria. The...
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Azat Saharyan
This project proposes an innovative direct DC-to-DC charging system for electric vehicles that eliminates the need for traditional inverters and complex power converters. The system achieves the required charging voltage by using a dynamic switching mechanism that adjusts the number of solar panels connected in series based on real-time solar intensity. By bypassing multiple energy conversion...
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Inga Babayan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)
Abstract. A double four-crystal X-ray interferometer has been developed and tested, and moiré patterns have been obtained with it. On the basis of this interferometer, a new method for studying imperfections in crystalline materials has been proposed. It is shown that double X-ray interferometers make it possible to describe more completely the stress field in crystals caused by defects and to...
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Dr Zara MKrtchyan (1. Institute of Applied Problems of Physics, National Academy of Sciences (NAS), Armenia; 2. International Scientific Educational Center (ISEC), NAS, Armenia)
In this paper the bentonite interaction with radioactive materials has been studied: particularly, as a natural enterosorbent for radioactive waste; characteristics and radiation absorption; effectiveness lied in cation exchange capacity.
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Bentonite clay is scientifically proven to bind to and remove certain radioactive isotopes from the body and the environment. The bentonite carries a... -
Angelina Bulavskaya (Tomsk Polytechnic University)
Non-destructive beam diagnostics based on coherent radiation phenomena are essential for monitoring high-energy electron beams. Among these phenomena, Smith-Purcell radiation, emitted when a charged particle passes near a periodic metallic structure [1, 2]. It offers particular promise for beam parameter reconstruction, including bunch length and transverse profile. However, the practical...
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Ahmed Alanazi
Background: Breast cancer remains a leading cause of cancer-related morbidity and
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mortality among women worldwide. Early detection through mammography screening is critical to improving survival outcomes. The Breast Imaging Reporting and Data System (BI-RADS) provides a standardized framework for interpreting and reporting mammography results.
Objective: This study aimed to evaluate the... -
Daria Polomoshnova (Tomsk Polytechnic University)
Precise beam diagnostics is a fundamental requirement in modern high-energy physics, particularly for optimizing the performance of accelerator complexes used in collider experiments, synchrotron radiation sources, and free-electron lasers. Among the most critical parameters to characterize is the transverse intensity distribution of the beam. A promising approach to obtain beam profiles is...
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129. New Salts of Amino Acids, The Discovery of a New Class of Salts and Their Possible ApplicationsAram Petrosyan
This lecture will provide an overview of the results of the authors who were awarded
the “Prize of the National Academy of Sciences of Armenia-2025”.1 Salts of amino acids with simple, dimeric, trimeric and tetrameric cations
2 Discovery of a new class of salts containing different amino acids
3 Discovery of a new type of polymorphism
4 A new effective remedy for the...
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Vrej Sahakyan (Military academy named after Vazgen Sargsyan MoD RA)
In the context of the rapid development of military technologies, the creation of next-generation aviation systems that combine high efficiency, mobility, and reduced energy consumption has become increasingly important. One of the most promising areas of modern aerospace engineering is the development of hybrid military aircraft that integrate conventional engines with electric and...
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Irina Bagdasaryan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)
Traditional methods for inspecting reinforced concrete elements often require partial destruction of the material or opening up the structure. In this regard, non-destructive testing methods are becoming increasingly widespread, as they allow the internal condition of a structure to be assessed without compromising its integrity.
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The application of X-ray and neutron tomography for... -
Nikita Berdnikov
As recent studies have shown, radiation with orbital angular momentum – commonly referred to as twisted radiation – has the potential to become a new tool in research, owing to the additional degree of freedom provided by the orbital angular momentum [1]. This type of radiation and the additional degree of freedom it offers can provide valuable additional information about the interactions of...
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Hayk Harutyunyan
We investigate the radiation from a pair of electron bunches moving along the cylindrical waveguide axis, assuming that the waveguide is partially loaded by a medium with periodic dielectric permittivity. The results of numerical calculations are presented in the special case of layered medium consisting of a finite number (2-4) of dielectric plates separated by vacuum gaps. We show that under...
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Levon Grigoryan (Institute of Applied Problems of Physics NAS RA)
The coherent radiation of charged particles was investigated. Specifically, 3 cases are considered when the radiation intensity is proportional to 1) the square of the number of particles in a bunch, 2) the square of the number of bunches in a train, and 3) the square of the number of periods in the case of a periodic medium. The possibility of the simultaneous occurrence of these three cases,...
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Samvel Mkhitaryan (Institute of Applied Problems of Physics NAS RA)
Armenia is located in one of the most seismically active regions of the Alpine–Himalayan seismic belt and has experienced several destructive earthquakes, including the catastrophic 1988 event that caused severe human and economic losses. Despite the above and significant advances in seismic monitoring and hazard assessment, the country still lacks an operational earthquake early warning...
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Mr Grigor Movsesyan (Institute for Informatics and Automation Problems NAS of RA)
We have recently demonstrated both theoretically and experimentally [1,2] that the quantum vacuum, in the limit of statistical equilibrium in three-dimensional space, forms an energy lattice composed of massless spin-1 Bose particles, which we call hions. Our extensive experimental studies have shown that material objects, particularly those undergoing continuous active processes (such as...
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Tatevik Sargsyan (Institute of Applied Physics, National Academy of Sciences)
The energy, spectral and temporal characteristics of corundum (a-Al2O3) with various activators in different optical regions were studied. The elements that can be part of optically active crystals and those elements that can create new exciton-photon interactions leading to new transitions and energy transformation were determined. The percentage of impurities in these crystals and the...
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Prof. Ashot Gevorkyan (IIAP and IAPP, NAS of RA)
The paper studies the quantum motion of a photon in an arbitrary medium. Using the Yang-Mills equations for Abelian fields within the SU(2)×U(1) gauge symmetry, we derive a system of second-order partial differential equations for the photon's three-component wave function. For a homogeneous medium along the direction of motion, we obtain an equation for the full wave function that accounts...
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Vladislav Borin (Budker INP)
We present an overview of recent and upcoming enhancements to the optical electron beam diagnostics stations at the Novosibirsk Free Electron Laser (FEL) facility. These diagnostic stations are designed to measure key beam parameters, including beam energy spread, length and emittance, at the third FEL of Novosibirsk FEL. Currently, the stations for measuring electron beam energy spread and...
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Dr Yeghisabet Hayrapetyan
In the process of adjusting and setting up optical telescopes and short-wave radio antennas, when checking the straightness of the axes of large-sized hollow cylindrical products, as well as in large-scale mechanical engineering and aircraft engineering, it is necessary to measure broken lines in arbitrary planes. For this purpose, a light rangefinder and a reflector are installed, as in...
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Prof. Giuseppe Dattoli (ENEA-Frascati Fusion Department (Retired))
Analytical and semi-analytical models of free-electron laser (FEL) dynamics have long provided valuable physical insight and practical tools for the design of self-amplified spontaneous emission and oscillator configurations. Logistic-type growth models and formulations based on Jacobi elliptic functions successfully capture the evolution from the small-signal regime to the onset of...
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Prof. DANILO GIULIETTI
The physical principles underlying the operation of a LASER will be presented, along with the main modes in which it can operate and the salient characteristics of the radiation it emits. Finally, the different characteristics of LASERs used in controlled thermonuclear fusion experiments and those on particle acceleration in plasmas will be considered.
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Pavel Karataev (University of London (GB))
Cherenkov Diffraction Radiation (ChDR), generated when a relativistic charged particle travels parallel to and close to a dielectric boundary, has attracted considerable research interest. As a type of polarization radiation, ChDR originates from the time-dependent polarization induced in the medium. Its characteristics are strongly influenced by beam parameters such as beam size, position,...
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Abdelmoneim Sulieman (King Saud bin Abdulaziz University for Health Sciences)
Computed tomography (CT) is the primary source of ionizing radiation exposure to the general population and contributes approximately 75% of the total collective dose from medical radiological examinations. Patients receive higher radiation doses during contrast-enhanced CT procedures, such as angiography, compared with routine CT scans. The objective of this study was to estimate...
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Dr Laya Anjo (CANDLE SRI)
Ionizing radiation exposure in outer space, nuclear reactor, and particle accelerators induces electronic defects leading to functional deterioration in standard semiconductor electronic components. Recent studies indicate that nanostructured metal oxide semiconductors, such as titanium dioxide (TiO2) and copper oxide (CuO), may serve as reliable materials in such harsh environments due to...
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Mr Sergey Bragin (Tomsk Polytechnic University)
Photons with orbital angular momentum are an effective tool for investigating rotational degrees of freedom in quantum systems [1]. In this work, we theoretically investigate the generation of such photons in three-frequency elliptical undulators, which serve as a bright source of photons in composite twisted states – linear superpositions of modes with definite projections of the total...
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Adolfo Esposito
Since few years, following the development of lasers able to focus ultra-short high intensity pulses onto targets, the generation of ionizing radiation by intense lasers became possible. This paper focuses on the radiological protection aspects, mainly licensing requirements, prompt and residual radiation fields, shielding of produced radiations, shielding materials, radiation monitoring,...
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Dr Zara MKrtchyan (1. Institute of Applied Problems of Physics, National Academy of Sciences (NAS), Armenia; 2. International Scientific Educational Center (ISEC), NAS, Armenia)
The aim of this research is to study the importance of the interconnection between Radiation Technologies and Behavior Management, that intersects particularly within specialized settings, focusing on optimizing safety, ensuring staff compliance with radiation protection standards, and improving outcomes. Key approaches include the application of behavioral models to inhance radiation...
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Dr Gevick Davoodi (Armenian National Agrarian University (ANAU)), Dr Laya Anjo (CANDLE SRI)
As a result of growing radiation risks in spacecraft, nuclear applications, and high energy physics experiments, there is an ever-growing need for radiation tolerant functional materials for electronic and sensing devices. Traditional silicon electronics degrade upon prolonged exposure to ionizing radiation due to accumulation of defects and carrier trapping. Hence, alternative approaches for...
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136. Resilient Stewardship: Radiation for the Preservation and Analysis of Cultural Heritage ObjectsProf. David Andrew Bradley (Applied Physics and Radiation Technologies Group, CCDCU, Sunway University, Malaysia & School of Mathematics and Physics, University of Surrey, United Kingdom)
As we gather for ASRP-BRIA 2026 in Yerevan, a city deeply rooted in ancient history, the role of beam-matter interactions in preserving our shared past becomes increasingly relevant. This talk explores the application of advanced radiation techniques—ranging from synchrotron radiation to X-ray fluorescence (XRF)—as essential tools for the non-destructive analysis and stabilization of...
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Ibrahim I. Suliman (Imam Mohammad Ibn Saud Islamic University)
Background:
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Interventional radiology (IR) procedures involve significant localized radiation, which can cause deterministic skin effects. Precise estimation of the peak skin dose (PSD) is crucial for patient safety, dose optimization, and follow-up. However, directly measuring the PSD is challenging because of the dynamic beam geometry and patient variability.
Objective:
This review... -
Dr Vahram Parazian (IAPP NAS RA)
Exact solutions of the Klein-Gordon equation in an external non-Abelian gauge field with an SU(N) symmetry group have been obtained. The external field is a solution of the Yang-Mills equations and describes a plane wave on the light cone. The obtained solutions form a complete set and can be used in the procedure of canonical quantization of scalar fields.
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Maria Bolshenko
Carbon–aluminum composites (CACs) are promising materials for the aviation and space industries, combining low weight with high strength and corrosion resistance. However, their practical application is limited by technological challenges, including the difficulty of impregnating carbon fibers with molten aluminum and the formation of brittle aluminum carbide at the phase interface. Despite...
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Artush Sedrakyan
The quasar 1641+39 is a relatively nearby and fairly bright source. In the blue band, it has exhibited variability with a very large amplitude, changing between magnitudes 14.7 and 17.7. Variability is a common phenomenon for quasars; however, a variation of 3 magnitudes is a rather rare event. Taking this variability into account, spectral studies produce the following picture (Fig. 1). From...
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Aleksandr Voskanyan
The quasar 0827+24 is located more than 30° above the plane of the Galaxy. Radiation coming from its surroundings is only weakly absorbed by the Galaxy, and therefore the reliability of the obtained observational data is fairly high. Spectral studies of the quasar show that:
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1. In the radio range, the spectrum is extremely flat (α ≈ 0, F ∼ να), which supports the idea that quasar 0827+24 is... -
Vahe Hovhannisyan (https://indico.cern.ch/event/1525866/abstracts/)
The quasar 1637+57 has been studied over a very wide range of the electromagnetic spectrum. Particularly interesting are the data obtained in the radio range, according to which the radio spectral index is close to 0, which is typical for quasars. For the majority of the 11 quasars studied by us, the spectral indices are also close to that of our quasar (Figure 1).
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Within a region of 6°... -
Kirill Boldyrev (Beijing Institute of Technology (BIT), Zhuhai BIT, Zhuhai 519088, P.R. China)
The project is aimed at a comprehensive experimental and theoretical study of exchange interactions, magnetotransport phenomena, spin and phase transitions in magnetic semiconductors, including complex cobalt oxides. These compounds demonstrate a wide range of physical phenomena, such as spin crossover, giant magnetoresistance, dielectric-metal transition, orbital ordering, ferroelectric and...
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Andrey Oleinik (Belgorod State Unversity), Majid Ali, Pavel Karataev (Royal Holloway, University of London)
The pyroelectric accelerator is a concept to generate X-ray and electron fluxes of moderate energy up to few tens keV only by change in temperature of pyroelectric material. It allows to obtain unprecedently low power consumption and compact X-ray and electron source with certain perspectives to application. The main challenge is to achieve stable and reproducible particle generation during...
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Mr Mikhail Vladimirov (National Research Nuclear University MEPhI)
High-quality electron bunches are now essential to fundamental science, from advanced light sources to ultrafast electron diffraction (UED) and microscopy (UEM). Electron bunches with low transverse emittance and charges ranging from tens of fC to hundreds of pC are typically generated via radiofrequency (RF) photoguns.
Photoemission, a key process in RF photoguns, determines initial bunch...
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Mikhail Shevelev
We report on vacuum testing of an optical‑fibre scanner for measuring transverse profiles and divergence of low‑intensity electron beams at the microtron TPU (5.7 MeV). The measurements were performed with a beam charge of 100 pC using two fibre materials of identical thickness (1 mm): PMMA (polymethyl methacrylate, also known as Plexiglas or organic glass) and a scintillating optical fibre....
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Prof. David Andrew Bradley (Applied Physics and Radiation Technologies Group, CCDCU, Sunway University, Malaysia & School of Mathematics and Physics, University of Surrey, United Kingdom)
Abstract
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Polytetrafluoroethylene (PTFE) is a chemically stable, biocompatible polymer with near tissue-equivalent properties, making it a candidate material for passive radiation detection in medical applications. In this work, the radiation-induced optical response of ultra-thin (~75 µm) PTFE sheets is investigated under clinical linear accelerator irradiation, with emphasis on... -
Abrahamyan
The article discusses the use of catastrophe theory for:
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1. Determining the number of independent (control)
parameters required in a given experiment;
2. Determining singular points at which phase transitions
are possible;
3. Determining the type of phase transition;
4. Providing a qualitative description of nonlinear
processes containing third and fourth degree derivatives.
A method... -
Astghik Danghyan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)
This study reports on the growth and comprehensive characterization of pure and L-Valine amino acid–modified α-LiIO₃ single crystals, with an emphasis on structural features and nonlinear optical properties. High-quality nonlinear optical (NLO) α-LiIO₃ crystals from pure aqueous solution and α-LiIO₃ crystals from an aqueous solution containing L-Valine amino acid (5 mol%) were grown using the...
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Leonid Goray (Alferov University)
The development of next-generation semiconductor technologies necessitates the use of modern methods for monitoring electronic circuit topology parameters, including critical dimensions, material homogeneity, and roughness. These challenges are particularly pressing in the fabrication of templates for high-aperture projection lithography in the extreme UV (EUV) and beyond (EUVL, BEUVL) ranges...
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Dmitry Roshchupkin
YZ-cut of a LiNbO3 crystal is the most commonly used in acoustoelectronics, as the propagation of surface acoustic waves (SAWs) in it is accompanied by autocollimation of the acoustic beam.
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High-resolution X-ray diffraction measurements were performed at the RKFM optical beamline of the Kurchatov Synchrotron Radiation Source to study the propagation of a surface acoustic wave with a...
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