Plasma Physics Reports最新文献

{"title":"Study of the Accuracy of the Numerical Plasma Boundary Reconstruction in the T-15MD Tokamak","authors":"D. L. Ulasevich,&nbsp;V. F. Andreev,&nbsp;V. E. Lukash,&nbsp;R. R. Khairutdinov","doi":"10.1134/S1063780X25604407","DOIUrl":"10.1134/S1063780X25604407","url":null,"abstract":"<p>The work presents a description and mathematical formulation of the D_Bound code designed to reconstruct the plasma boundary in a tokamak. This code is a modified version of the DINA-FIT code, which is part of the DINA plasma physics complex, and is designed for the T-15MD. The results of a numerical study of the accuracy of the plasma boundary reconstruction in the T-15MD tokamak using the D_Bound code are presented. The algorithm used has been validated for synthetic equilibrium magnetic configurations covering a wide range of the form of the plasma cross section. The influence of input data errors on the accuracy of the boundary reconstruction has been studied. It is shown that errors in determining currents in poloidal coils and an inductor have the greatest impact on the result. The stability of the method with respect to a decrease in the number of diagnostic sensors has been analyzed. The reconstructed positions of the plasma current centroid are compared with soft X-ray diagnostic data based on experimental pulses of the T-15MD campaign in the spring of 2025. Good agreement between the numerical results and the experiment is shown.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"1 - 14"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Directed Ion Fluxes and Plasma Parameter Distributions in the Jet and Vicinity of a Stationary Plasma Thruster Operated on Krypton","authors":"V. P. Kim,&nbsp;R. V. Akhmetzhanov,&nbsp;S. V. Baranov,&nbsp;A. V. Mel’nikov,&nbsp;E. A. Shilov","doi":"10.1134/S1063780X25604316","DOIUrl":"10.1134/S1063780X25604316","url":null,"abstract":"<p>The results of an experimental determination of the spatial structure of accelerated ion flows outflowing from a krypton-fueled laboratory model of the SPT-70V—a new stationary plasma thruster with an acceleration zone with the main potential drop removed from its construction—as well as the plasma parameter distributions in the model jet are presented. The removal of the acceleration zone from the thruster discharge chamber allows a significant reduction in accelerated ion flows onto its walls, reducing their sputtering and increasing the thruster service life. The results of a study of the plasma parameter distributions and directed slow ion flows near the “output plane” of this thruster model are also presented. These ion flows move primarily in the “radial” and “reverse” directions and form a plasma cloud in the space around the operating thruster. These data can be used to estimate the potential impacts of the jet of the thruster being developed based on the SPT-70V prototype on the structural elements and various spacecraft systems. These results were used to estimate the efficiency of ionization and ion acceleration in the discharge of the SPT-70V prototype under study, to reveal the features of directed flows of slow ions moving in the closevicinity of the aforementioned “output plane” of the SPT-70V prototype in radial and reverse directions, and the physical factors determining their formation. In particular, the important role of the spatial distributions of the accelerated ion concentration and the electron temperature in the near-axial part of the jet in the formation of the electric potential distributions and directed flows of charge exchange ions moving near the “output plane” of the SPT-70V prototype in directions close to radial ones is demonstrated. It is also shown that the set of the obtained data indicates the dominant role of charge exchange ions in the formation of directed flows of slow ions in the near zone of the jet and the plasma cloud in the space surrounding the operating thruster.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"30 - 52"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and Numerical Study of the Structure of a Low-Pressure Surface-Wave-Sustained Discharge","authors":"V. P. Stepin,&nbsp;V. I. Zhukov,&nbsp;D. M. Karfidov,&nbsp;N. N. Bogachev","doi":"10.1134/S1063780X25603530","DOIUrl":"10.1134/S1063780X25603530","url":null,"abstract":"<p>An experimental and numerical study of a low-pressure discharge sustained by a surface electromagnetic wave (SEW) in argon (<i>p</i> ≈ 1−2 Torr) has been performed. The discharge has been excited by a high-frequency (HF) field (445 MHz, 45 W) in a quartz tube (24 mm in diameter) using a surfatron. The self-consistent simulation of the discharge has been performed using the KARAT PiC code, which takes into account the dynamics of the electromagnetic field and the spatiotemporal evolution of the plasma. The longitudinal and radial profiles of the plasma density and the distribution of the SEW field of a stationary discharge, the propagation velocity of the ionization front, and the time it takes for the discharge to reach a stationary state has been experimentally measured. The numerical simulation shows good agreement with the experimental data and has allowed a detailed study of the discharge formation dynamics, including the evolution of the electromagnetic field and the spatial distribution of the plasma density. It is shown that under the experimental conditions (<i>p</i> ≈ 1−2 Torr), the initial ionization occurs near the tube wall, forming a tubular plasma structure. At times determined by ambipolar diffusion, the density profile transforms into a distribution close to the Bessel function. A numerical model has demonstrated that, as the pressure and tube radius vary, a transition from a tubular structure to the plateau-shaped profile and plasma density distribution with a maximum on the axis is observed. The structure of the discharge ionization front has been studied. In the critical density region, an enhancement of the HF field is observed, accompanied by nonlocal heating of electrons and the formation of an ambipolar field. As the pressure increases to 3 Torr, when the collision frequency becomes close to the cyclic frequency of the field, the field enhancement and the increase in electron energy at the front are hardly observed, the ambipolar diffusion component weakens, and the propagation velocity of the ionization front decreases significantly.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"108 - 124"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a Disturbance from a Local Discharge in a Laminar Boundary Layer at M = 1.43","authors":"O. I. Vishnyakov,&nbsp;P. A. Polivanov,&nbsp;S. O. Morozov,&nbsp;A. A. Sidorenko","doi":"10.1134/S1063780X25603803","DOIUrl":"10.1134/S1063780X25603803","url":null,"abstract":"<p>Disturbances generated by a short-period spark discharge in a laminar boundary layer on a plate at a free-stream Mach number of M = 1.43 have been examined. The study consists of experimental and numerical components. In the experiment, a spark discharge has been initiated in the boundary layer lasting less than a microsecond, which is an order of magnitude shorter than the characteristic times of boundary layer disturbances. The numerical simulation has been used to study in more detail the process of receptivity and disturbance development in the boundary layer as a function of the energy input. The numerical simulation showed that the Tollmien–Schlichting wave is unambiguously detected starting at a distance of approximately 50δ from the discharge. It is found numerically that, for a small energy input, the most rapidly growing oblique waves are those of the first mode, which agrees with the estimate according to the linear stability theory. As the energy input increases, a second type of disturbance, reminiscent of a longitudinal structure, starts to be manifested in the mass flow pulsations. In the experiment, with a higher energy supply value than in the calculation, it was possible to record only the second type of disturbances, while the maximum amplitude of mass flow pulsations reaches 30%.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"69 - 79"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical Conductivity of High-Temperature Equilibrium Hydrogen Plasma","authors":"D. V. Pozdnyakov","doi":"10.1134/S1063780X25604237","DOIUrl":"10.1134/S1063780X25604237","url":null,"abstract":"<p>Specific low-field conductivity of high-temperature (10⁶–10⁹ K) equilibrium hydrogen plasma is calculated for a wide range of its charge-carrier concentrations (10¹⁵–10³⁵ m^–3) within the framework of the approximation of the ensemble-average relaxation time of electron momentum. The dominant mechanisms of electron scattering in plasma, including pair Coulomb electron–ion and electron–electron collisions, as well as absorption/emission of plasmons, are taken into consideration. It is shown theoretically that the dependence of electron conductivity of plasma on concentration of its charge carriers has two characteristic regions: the region of nearly constant electrical conductivity and the region of nearly constant electron mobility.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"89 - 100"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Barrier Discharge in Air: Influence of the Surface Charge on the Streamer Generating Voltage and Their Spatial Structure","authors":"Yu. S. Akishev,&nbsp;N. A. Dyatko,&nbsp;I. V. Kochetov,&nbsp;A. V. Petryakov,&nbsp;Tao Shao,&nbsp;Cheng Zhang,&nbsp;Shuai Zhang","doi":"10.1134/S1063780X25604328","DOIUrl":"10.1134/S1063780X25604328","url":null,"abstract":"<p>The pulsed and sinusoidal barrier discharges in air have been studied. Plane-to-plane and pin‑to‑plane electrode configurations implementing volume and surface barrier discharges have been used. Experimental results on the influence of the electric charge deposited by streamers or an external source on the barrier surface, on the voltage at which streamers are generated and on their configuration are presented. In the case of the surface barrier discharge, results are presented for two situations: in the absence and in the presence of a strong magnetic field perpendicular to the surface streamer current. A “memory” effect is observed for positive streamers formed in adjacent half-periods of the sinusoidal voltage.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"101 - 107"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectral Pyrometry of Dusty Plasma During an Electric Explosion of a Tungsten Wire","authors":"K. A. Alabin,&nbsp;R. M. Arshba,&nbsp;D. A. Voitenko,&nbsp;N. D. Pilia,&nbsp;G. V. Saretsyan,&nbsp;A. P. Sviridov,&nbsp;L. I. Urutskoev,&nbsp;D. V. Filippov,&nbsp;N. Z. Chikovani","doi":"10.1134/S1063780X25604389","DOIUrl":"10.1134/S1063780X25604389","url":null,"abstract":"<p>It is well known that the optical spectrum of the radiation produced during the electric explosion of tungsten wires (EEW) in vacuum is composed of both line and continuous components. A detailed description of a spectral pyrometry method is presented, which allows one to use the shape of the Planck component of the continuous spectrum to determine the effective temperature of the explosion products. The effect of temperature growth during the EEW on the measurements of effective and maximum temperatures is discussed. Results are presented from numerical simulations of temperature for different time dependences of its dynamics. It is shown that, under the linear approximation of temperature growth, the calculated results agree satisfactorily with experimental data. It is shown that, when the wire reaches the tungsten boiling point, no Planck continuous spectrum is observed. The developed method allows one to estimate the absolute luminous flux during EEW. It is shown that the light radiation from EEW products is volumetric. Additionally, during the electric explosion, an extra continuous spectrum—relative to the Planck spectrum—is observed in the 360–500 nm wavelength range, which is produced by nonequilibrium radiation. The characteristics of this nonequilibrium radiation and its dependence on the diameter of the exploding wire were obtained and possible mechanisms of its production are also discussed.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"53 - 68"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excitation of Dust-Acoustic Wave Turbulence in Saturn’s Magnetosphere","authors":"D. V. Shokhrin,&nbsp;S. I. Popel,&nbsp;S. I. Kopnin","doi":"10.1134/S1063780X2560416X","DOIUrl":"10.1134/S1063780X2560416X","url":null,"abstract":"<p>Linear and nonlinear processes that can play an important role in the plasma of Saturn’s magnetosphere and are associated with the presence of dust are analyzed. Excitation of dust-acoustic wave turbulence caused by the interaction of heavy ions and “cold” electrons of Saturn’s magnetosphere with charged dust is described. It is demonstrated that dust-acoustic waves can be driven in the range of distances between approximately one and a half to two planet radii from the center of Saturn. The induced scattering of the dust-acoustic waves by dust particles represents the primary nonlinear process affecting their spectrum. The wave spectrum is determined by the balance of the linear and nonlinear effects. It turns out that the ratio of the energy density of the dust-acoustic waves to the energy density of plasma particles is relatively large, which is indicative of the dust-acoustic wave turbulence playing an important role in Saturn’s magnetosphere and the possibility of the generation of the dust-acoustic nonlinear waves, such as solitons or periodic nonlinear waves.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"80 - 88"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First Observations of Strong Anomalous Absorption of Microwave Beam of Ordinary Polarization in Plasma Filament","authors":"M. S. Usachonak,&nbsp;A. Yu. Popov,&nbsp;L. V. Simonchik,&nbsp;E. Z. Gusakov,&nbsp;P. V. Tretinnikov","doi":"10.1134/S1063780X25604225","DOIUrl":"10.1134/S1063780X25604225","url":null,"abstract":"<p>Model experiments at the Granit linear facility revealed anomalous absorption of microwave power of a pump ordinary wave in a plasma filament. This absorption is observed under conditions when there were no linear mechanisms in the plasma volume that could explain this phenomenon. Theoretical analysis shows that this anomalous absorption may be a consequence of the excitation of low-threshold parametric decay instability of the pump ordinary wave. The instability development results in the excitation of daughter upper-hybrid and electron plasma waves localized in the central part of the plasma filament.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 1","pages":"15 - 29"},"PeriodicalIF":1.1,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-Pressure HF Jet Discharge in a System with a Liquid (Non-Metallic) Electrode","authors":"R. R. Kayumov,&nbsp;I. Sh. Abdullin,&nbsp;Al. F. Gaisin,&nbsp;S. Yu. Petryakov","doi":"10.1134/S1063780X25604006","DOIUrl":"10.1134/S1063780X25604006","url":null,"abstract":"<p>A high-frequency jet discharge (1.76 MHz) at reduced pressure in a system with a liquid plasma-forming medium (6% aqueous solution of (NH₄)₂SO₄) has been studied experimentally. The morphology and stability of the discharge, its electrophysical, spectral, and thermal characteristics have been studied in the range of 1000–80 000 Pa. It is shown that the discharge transferred from a discrete microchannel structure to an extended truncated-conical column when the pressure decreased from close to atmospheric one to 20‒4 kPa. At ~1 kPa, non-stationarity and breakdown dynamics occur due to a decrease in the boiling point and intense vaporization. The current–voltage characteristics are plotted as Lissajous ellipses. Emission spectroscopy and the analysis of the Hα/Hβ Stark broadening show the electron density along the Hβ line. Infrared thermography records a local temperature maximum in the jet–plasma interaction zone. The results provide a “passport” for the modes and confirm the existence of an energy-efficient pressure range of 20‒40 kPa for plasma-liquid applications.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"51 12","pages":"1512 - 1520"},"PeriodicalIF":1.1,"publicationDate":"2026-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}