Ашық рұқсат
Рұқсат берілді
Тек жазылушылар үшін
Том 89, № 9 (2025)
Synchrotron and Free Electron Laser Radiation: Generation and Applications
Research using synchrotron radiation at the Novosibirsk synchrotron and terahertz radiation center
Аннотация
The Shared Facility Siberian Center for Synchrotron and Terahertz Radiation enables scientists from various organizations to apply modern analytical methods using synchrotron radiation to a wide range of research. The Center has become a basis for a well-developed user community, which brings together researchers from institutes of the Siberian Branch of the Russian Academy of Sciences and other organizations. In addition to conducting experiments, the Center is constantly working to improve the existing methods and develop new approaches, which is important in light of the creation of experimental stations for the Siberian Ring Photon Source (SKIF) project. The publication is a brief overview of the current situation on the above topics.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1350-1363
1350-1363
Pulsed wire measurements of the 120-pole superconductive undulator
Аннотация
A method for measuring the magnetic fields of undulators based on a wire with a pulsed current is considered. This method is promising for creating a fine-tuning system for undulators, which can work in on-line mode because a single measurement takes only a few seconds. The pulsed wire field measurements were carried out with the superconductive 128-pole undulator with the magnetic field amplitude of 1.15 T and magnetic period of 15.6 mm.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1364-1369
1364-1369
Phase error correction of superconducting undulator by additional currents
Аннотация
We described a method for correcting the magnetic field of a superconducting undulator with neutral poles. For correction, the main windings of the undulator are used, grouped into separate groups and powered by additional currents. Graphs of phase errors are presented for the entire range of magnetic fields of the undulator after correction. The magnitudes of the total and local phase errors were 3.5 and 1.9 degrees for a maximum field of 1.2 T.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1370-1376
1370-1376
Superconducting 40-poles wiggler with 4.5 Tesla magnetic field and 48 mm period for synchrotron radiation source SKIF
Аннотация
The Institute of Nuclear Physics SB RAS has developed and created a 40-pole superconducting wiggler with a field of 4.5 T and a period of 48 mm for the 4th generation synchrotron radiation source SKIF under construction. The wiggler will be used as a source of high-energy X-ray radiation in the range from 25 to 150 keV with an integrated power of 40 kW. The article justifies the choice of wiggler parameters, describes the features of its design, and provides the calculated characteristics of the wiggler and the radiation generated by it.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1377-1381
1377-1381
Hybrid photodiode 1×20 format array with variable gain for recording vacuum ultraviolet and soft X-ray plasma radiation
Аннотация
Characteristics of the 1×20 format silicon SPD detectors hybrid array for UV and soft X-ray radiation diagnostics of high-temperature plasma are presented. It is possible to switch the gain from 105 to 107 V/A to expand recorded signals dynamic range; the response time was 3 and 70 µs, respectively. Visualization of 8 keV X-ray radiation energy was demonstrated. Array design and circuitry allow the use of technology that eliminates the influence of secondary electron emission currents on the accuracy of measurements.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1382-1387
1382-1387
Development of the section “Plasma” for the station 1-3 “Fast Processes” at the source of synchrotron radiation SKIF
Аннотация
We presented the project of the section “Plasma” of station 1-3 “Fast Processes” at the source of synchrotron radiation SKIF. The main task of the section is to study the mechanical behavior of promising fusion materials under the influence of pulsed heat load.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1388-1395
1388-1395
Investigation of the possibilities of detecting light elements in plants by the X-ray fluorescence analysis with synchrotron radiation at the “SR Technological Station” at the VEPP-4M storage ring
Аннотация
We consider the expansion of the capabilities of X-ray fluorescence element analysis on synchrotron radiation in Budker INP SB RAS with the purpose of detection of light elements. For this, the equipment and software of «Technological Station» was modified. Experimental installation is described, selection of parameters of experiment is substantiated, estimates of minimum detection limit for Al, Si, P, S, Cl are given.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1396-1403
1396-1403
The review of modern domestic pumps for ultra-high vacuum in the beam accelerators and nuclear fusion devices
Аннотация
The domestic modern pumps based on non-evaporable getters and ion-getter pumps for obtaining an ultrahigh vacuum at 10–11 Torr level are considered in this paper. The experimental results of pumping speed measurements as a function of gas pressure are presented for various types of ion-getter pump. The pumping speed measurements of the pumps based on non-evaporable getters for H2, CO and D2 are also shown.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1404-1411
1404-1411
Dynamics of jet density under impact on metal plates
Аннотация
The emission of a flow of particles of different sizes (shockwave “dusting”) from the structural joints of metal plates under strong impact from an explosive charge was investigated. The process of microparticle emission was recorded using the method of pulsed radiography of synchrotron radiation. Density distributions along the resulting microjets are presented.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1412-1417
1412-1417
Investigation of the effect of radiation on the properties of polyurethane-based polymer composites
Аннотация
The effect of ionizing and UV radiation on the physico-mechanical characteristics of polymer materials based on SiO2 nanoparticles of the TarkosilⓇ brand and injection molded polyurethane of different storage times of the initial components has been studied. It is shown that because of exposure to ionizing radiation (1000 Gy), the tensile strength increases to 30% (from 23 to 30 MPa) and the elongation to 65% (from 382 to 627%) of polyurethane based on components manufactured a month before the synthesis of samples. The possibility of the influence of external factors, such as UV and ionizing radiation, on the performance characteristics of products and parts based on injection molded polyurethane to improve the physical and mechanical properties.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1418-1423
1418-1423
Preparation of lanthanum hexaboride by self-propagating high-temperature synthesis for use in accelerator technology
Аннотация
Lanthanum hexaboride was obtained by self-propagating high-temperature synthesis using mechanical activation of La2O3-B-Mg charge. The optimal quantitative ratio of the components (wt. %): La2O3 – 43.5, B – 37.3, Mg – 19.2 was selected, which ensures a more complete combustion reaction. The washing mode of the synthesized product was experimentally selected, which ensures the production of monophasic lanthanum hexaboride, and its properties were studied.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1424-1430
1424-1430
Soft X-ray spectroscopy at the synchrotron radiation station “Kosmos”
Аннотация
The synchrotron radiation metrology station Kosmos operates in the soft X-ray range and, along with metrology studies, provides the possibility of measuring EXAFS and XANES spectra in the energy range of 2–10 keV. Tuning according to the energy scale is performed with the use of glitches, which allows for increased reproducibility of the results. The new monochromator covering the energy range of up to 480 eV was used in the measurement of the XANES spectra of test samples near the K edge of Al (1559 eV) and the L edge of copper (932.7 eV). The designs of both monochromators and examples of spectra are presented.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1431-1436
1431-1436
Geochemical model of the formation of anomalous layer 1908–1910 in bottom sediments of Lake Peyungda (Tunguska Nature Reserve) according to the data of X-ray fluorescence microanalysis with synchrotron radiation
Аннотация
In the bottom sediments of Lake Peyungda, located 30 km from the epicenter of the Tunguska Cosmic Body (TCB) explosion in 1908, a layer with an increased concentration of chemical elements has been found. For its study, methods of scanning X-ray fluorescence microanalysis, electron microscopy, and Raman spectroscopy have been employed. In the layer corresponding to the years 1908–1910, there is an observed increase in the number of mineral grains resulting from the weathering of the surrounding rock, which is likely associated with the TCB explosion.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1437-1442
1437-1442
Planar relativistic subterahertz surface-wave oscillators based on two-dimensional periodic slow-wave structures
Аннотация
Using the theoretical analysis and three-dimensional PIC modeling, a project of a planar relativistic G-band surface-wave oscillator was developed based on the SINUKI high-current accelerator (IAP RAS, Nizhny Novgorod, 1 kA / 600 keV / 17 ns), powered by a sheet electron beam. The electrodynamic system of the oscillator is based on a two-dimensional periodic slow-wave structure implementing a two-dimensional distributed feedback mechanism and providing mode selection in three spatial coordinates. The conducted simulation shows the possibility of obtaining stable single-mode oscillation regime in the specified scheme with an efficiency of ~ 8%. The experiment demonstrated a stable single-mode regime at a frequency of 160 GHz with a pulse duration of up to 5 ns and an output power of ~ 30 MW.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1443-1449
1443-1449
Multi-gigawatt sub-THz free-electron maser of planar geometry with three-dimensional distributed feedback: design parameters and simulations
Аннотация
The simulations of spatially extended free-electron masers (FEM) of planar geometry based on the use of a three-dimensional distributed feedback mechanism, which is implemented in the so-called “three-dimensional” Bragg structures, is carried out. The possibility of creating an FEM of this type in the W-band based on high-current explosive emission accelerator “U-2” (BINP RAS) forming a sheet electron beam of 1 MeV / 140 kA / 10 μs with a cross section of 1 cm × 140 cm is studied. The possibility of implementing a stable narrow-band generation regime in the FEM under development at optimal parameters with an electron efficiency of ∼ 18–20% and a record output power of up to ∼ 20 GW level is demonstrated.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1450-1456
1450-1456
Planar sub-THz / sub-GW Cherenkov masers with two-dimensional distributed feedback based on the “ELMI” accelerator: current implementation tasks
Аннотация
Development of powerful spatially extended Cherenkov masers of planar geometry is currently in progress in collaboration between BINP RAS (Novosibirsk) and IAP RAS (Nizhny Novgorod) based on the “ELMI” accelerator 1 MeV / 5–7 kA / 3 µs. To ensure the radiation coherence in conditions of substantial oversize of the interaction space, these projects use a two-dimensional distributed feedback mechanism, which is implemented in 2D-periodic slow-wave structures. The paper presents the results of simulations and optimization aimed at the output power enhancement and increasing the stability of the narrow-band generation regime in the developed relativistic masers. The current stage of their experimental implementation is discussed.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1457-1463
1457-1463
Cyclotron excitation of terahertz plasmons by electron beams (plasmon gyrotron)
Аннотация
An electron cyclotron maser (gyrotron) based on the excitation of a surface wave (plasmon) in an open cavity is proposed. The possibilities of implementing such a “plasmon gyrotron” in the terahertz frequency range are discussed, as well as its advantages in terms of ensuring selective excitation of high cyclotron harmonics in it.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1464-1469
1464-1469
Electromagnetic field and materials (fundamental physical research)
Features of magnetization reversal in magnetic layers of a synthetic antiferromagnet in a spin-tunnel element
Аннотация
A theoretical model of a spin-tunnel element containing a synthetic antiferromagnet was developed, based on the concept of coherent rotation of magnetization vectors of ferromagnetic nanolayers under the influence of an external magnetic field. The obtained field dependences cos() for nearly compensated and non-compensated synthetic antiferromagnets show that a 30% non-compensated synthetic antiferromagnet switches magnetization at lower fields.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1471-1478
1471-1478
On the influence of the weak magnetic field pulses on the domain structure and magnetic parameters of Fe73(SiBNb)27 alloys with copper addition
Аннотация
The effect of magnetic pulse treatment on the magnetic structure of foil made of amorphous alloy Fe73(SiBNb)27 with the addition of 1% copper was studied. The foil was obtained by the method of ultra-fast cooling during melt spraying on a rapidly rotating copper drum. It was found that because of the action of pulses of a weak magnetic field, a domain structure appears in the material under study. The nature of the domain structure and the magnetic characteristics of the foil depend on the parameters of magnetic pulse treatment.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1479-1483
1479-1483
Phase change of optical radiation during two-phonon Bragg diffraction
Аннотация
The change of the zero Bragg order phase in the process of two-phonon acousto-optic diffraction with a change in the frequency of an acoustic wave has been theoretically and experimentally investigated. It is shown that changing the phase of the wave allows for a controlled rotation of the plane of polarization of linearly polarized radiation if diffraction occurs in an anisotropic gyrotropic crystal.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1484-1489
1484-1489
Study of electromagnetic and temperature fields of a steel part with a protective coating
Аннотация
We discussed mathematical modeling of electromagnetic and temperature fields of a steel cylindrical part with a protective coating during induction heating with melting of the protective corrosion-resistant coating, considering the electromagnetic and thermophysical properties of the part and coating and the heating curve with two Curie points.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1490-1494
1490-1494
Synthesis and study of the binary compounds’ properties containing iron oxide nanoparticles
Аннотация
A mixed solid solution of magnetite/maghemite and composite powders of magnetized bentonite and magnetized activated carbon were synthesized by the chemical coprecipitation method. Based on X-ray diffraction data, quantitative characteristics of point defects of the crystal structure in the studied materials were obtained. A decrease in saturation magnetization and residual magnetization upon transition from magnetite/maghemite to magnetized composites was established.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1495-1499
1495-1499
Experimental study of electrophysical properties of ferromagnetic steel pipes
Аннотация
We proposed a methodology for experimental study of the electrophysical properties of steel pipes for induction-resistive heating systems. As a result of a series of experiments, the values of specific electrical resistance, the dependence of the relative magnetic permeability for steel pipes with different geometric dimensions and production technology were determined.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1500-1505
1500-1505
Features of electric current flow in periodic structures of magnetic sensors with resistance anisotropy
Аннотация
A model of electric current flow in magnetoresistive elements has been developed, based on the solution of a two-dimensional boundary value problem for the Laplace’s equation with mixed Dirichlet–Neumann conditions in an anisotropic medium. For the “barber-pole” structure, the dependence of the sensor output characteristics on geometric parameters has been established by numerical modeling, which determines ways to optimize its sensitivity.
Bulletin of the Russian Academy of Sciences: Physics. 2025;89(9):1506-1512
1506-1512