Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601414
A. S. Saveliev
Abstract
The joint impact of an electrical discharge and a gas–droplet flow of a conducting liquid created by a centrifugal nozzle is studied. In the experiment, the electrical parameters of the discharge are recorded, and the local characteristics of the spray, namely, the droplet diameter distributions of the number of droplets and the components of their velocity vector are measured. The measurements are carried out using double shadow microphotography. The effect of a spray of a conducting liquid on the time-averaged electrical parameters of the discharge, as well as changes in the properties of the spray under the influence of high voltage and current, are studied. Additionally, the spray characteristics are measured when a high voltage of pre-breakdown value is applied. High-speed photography of a discharge in the presence of droplets of conducting liquid is carried out.
{"title":"Formation of a Spray of Conducting Liquid under High Voltage and Electrical Discharge Plasma","authors":"A. S. Saveliev","doi":"10.1134/s1063780x23601414","DOIUrl":"https://doi.org/10.1134/s1063780x23601414","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The joint impact of an electrical discharge and a gas–droplet flow of a conducting liquid created by a centrifugal nozzle is studied. In the experiment, the electrical parameters of the discharge are recorded, and the local characteristics of the spray, namely, the droplet diameter distributions of the number of droplets and the components of their velocity vector are measured. The measurements are carried out using double shadow microphotography. The effect of a spray of a conducting liquid on the time-averaged electrical parameters of the discharge, as well as changes in the properties of the spray under the influence of high voltage and current, are studied. Additionally, the spray characteristics are measured when a high voltage of pre-breakdown value is applied. High-speed photography of a discharge in the presence of droplets of conducting liquid is carried out.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578061","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601190
S. F. Garanin, E. M. Kravets
Abstract
In plane current sheets (foils, or liners), which are thin in comparison with their skin depth, an instability may grow because parallel currents in different areas of these sheets are attracted that leads to compression of these areas and partition of the current sheets into threads. This work describes the study of the nonlinear tearing instability evolution for a 1D case, when all the principal quantities (surface current and mass densities, velocity, and the magnetic field component normal to the sheet surface) depend on the coordinate perpendicular to the current density vector only. A 1D system of equations has been obtained, which describes the magnetic field dynamics and the substance motion in current sheets, and a numerical technique based on the Lagrangian discretization of mass has been developed to solve 1D magnetic hydrodynamics problems. It is shown that, if the tearing instability is considered, small perturbations of currents, velocities and mass densities grow in accordance with the earlier found growth rates of small perturbations and later, when the perturbations are no longer small, a nonlinear growth stage comes. In this stage, the perturbations of the surface current density j and the surface mass density μ increase unlimitedly for a finite time period (apparently, according to power laws (jsim {{({{t}_{s}} - t)}^{{ - alpha }}}), (mu sim {{({{t}_{s}} - t)}^{{ - gamma }}}), ({{t}_{s}}) is the time, when these quantities become infinite); however the width of the current and mass density peaks tends to zero, so that the total current and total mass in the peaks of the current density and surface mass density decrease and tend to zero.
{"title":"Nonlinear Evolution of the Tearing Instability in a Thin Current Sheet","authors":"S. F. Garanin, E. M. Kravets","doi":"10.1134/s1063780x23601190","DOIUrl":"https://doi.org/10.1134/s1063780x23601190","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In plane current sheets (foils, or liners), which are thin in comparison with their skin depth, an instability may grow because parallel currents in different areas of these sheets are attracted that leads to compression of these areas and partition of the current sheets into threads. This work describes the study of the nonlinear tearing instability evolution for a 1D case, when all the principal quantities (surface current and mass densities, velocity, and the magnetic field component normal to the sheet surface) depend on the coordinate perpendicular to the current density vector only. A 1D system of equations has been obtained, which describes the magnetic field dynamics and the substance motion in current sheets, and a numerical technique based on the Lagrangian discretization of mass has been developed to solve 1D magnetic hydrodynamics problems. It is shown that, if the tearing instability is considered, small perturbations of currents, velocities and mass densities grow in accordance with the earlier found growth rates of small perturbations and later, when the perturbations are no longer small, a nonlinear growth stage comes. In this stage, the perturbations of the surface current density <i>j</i> and the surface mass density μ increase unlimitedly for a finite time period (apparently, according to power laws <span>(jsim {{({{t}_{s}} - t)}^{{ - alpha }}})</span>, <span>(mu sim {{({{t}_{s}} - t)}^{{ - gamma }}})</span>, <span>({{t}_{s}})</span> is the time, when these quantities become infinite); however the width of the current and mass density peaks tends to zero, so that the total current and total mass in the peaks of the current density and surface mass density decrease and tend to zero.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578378","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601475
N. P. Kyrie, D. E. Kharlachev, K. V. Shpakov
Abstract
Spectroscopy methods were used for studying the dynamics of neutral plasma component in current sheets formed in two-dimensional (2D) and three-dimensional (3D) magnetic configurations during discharge in helium. It has been ascertained that when the current sheet is formed in the 2D magnetic field, flows of fast suprathermal helium atoms appear in it, which are directed along the current sheet width (the largest of the sheet transverse dimensions). It is shown that helium atoms can acquire the directed energy Wx due to the resonance charge exchange of accelerated ions in the current sheet plasma. The energy of directed motion of helium atoms can reach Wx ≈ (480 ± 120) eV, which is ~20 times higher than the temperature of helium atoms Ta ≈ (20 ± 2) eV at the same times. During the current sheet formation in the 3D magnetic configuration, fast helium atoms were not observed.
摘要 在氦放电过程中，使用光谱学方法研究了在二维（2D）和三维（3D）磁场配置下形成的电流片中中性等离子体成分的动态。研究发现，当电流片在二维磁场中形成时，其中会出现快速过热氦原子流，这些原子流沿着电流片宽度（电流片横向尺寸中最大的尺寸）流动。研究表明，由于电流片等离子体中加速离子的共振电荷交换，氦原子可以获得定向能量 Wx。氦原子的定向运动能量可达 Wx ≈ (480 ± 120) eV，比同一时刻氦原子的温度 Ta ≈ (20 ± 2) eV 高出约 20 倍。在三维磁构型的电流片形成过程中，没有观测到快速氦原子。
{"title":"Studies of Dynamics of Neutral Component of Current Sheet Plasma, Based on Spectral Broadening of Helium Line He I 5876 Å","authors":"N. P. Kyrie, D. E. Kharlachev, K. V. Shpakov","doi":"10.1134/s1063780x23601475","DOIUrl":"https://doi.org/10.1134/s1063780x23601475","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Spectroscopy methods were used for studying the dynamics of neutral plasma component in current sheets formed in two-dimensional (2D) and three-dimensional (3D) magnetic configurations during discharge in helium. It has been ascertained that when the current sheet is formed in the 2D magnetic field, flows of fast suprathermal helium atoms appear in it, which are directed along the current sheet width (the largest of the sheet transverse dimensions). It is shown that helium atoms can acquire the directed energy <i>W</i><sub><i>x</i></sub> due to the resonance charge exchange of accelerated ions in the current sheet plasma. The energy of directed motion of helium atoms can reach <i>W</i><sub><i>x</i></sub> ≈ (480 ± 120) eV, which is ~20 times higher than the temperature of helium atoms <i>T</i><sub><i>a</i></sub> ≈ (20 ± 2) eV at the same times. During the current sheet formation in the 3D magnetic configuration, fast helium atoms were not observed.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578063","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601256
V. Yu. Kozhevnikov, A. V. Kozyrev, A. O. Kokovin, N. S. Semenyuk
Abstract
Results of a theoretical description of collisionless kinetics of radial expansion of two-component (electron–ion) plasma in the one-dimensional cylindrical formulation of the problem are presented. The electric-field mechanism of supersonic expansion of the plasma flame due to the motion of the electron–ion ensemble and self-consistent electric field in the diode with the potential difference applied to it is demonstrated. The spatiotemporal evolution of the ion energy distribution function, electric potential, and rate of expansion of the emission boundary of the plasma flame is shown. The calculated rates of flame expansion at the copper cathode (~1.5 × 106 cm/s) well agree with the experimental data.
{"title":"Kinetic Model of Vacuum Plasma Expansion in a Cylindrical Gap","authors":"V. Yu. Kozhevnikov, A. V. Kozyrev, A. O. Kokovin, N. S. Semenyuk","doi":"10.1134/s1063780x23601256","DOIUrl":"https://doi.org/10.1134/s1063780x23601256","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Results of a theoretical description of collisionless kinetics of radial expansion of two-component (electron–ion) plasma in the one-dimensional cylindrical formulation of the problem are presented. The electric-field mechanism of supersonic expansion of the plasma flame due to the motion of the electron–ion ensemble and self-consistent electric field in the diode with the potential difference applied to it is demonstrated. The spatiotemporal evolution of the ion energy distribution function, electric potential, and rate of expansion of the emission boundary of the plasma flame is shown. The calculated rates of flame expansion at the copper cathode (~1.5 × 10<sup>6</sup> cm/s) well agree with the experimental data.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578454","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601426
E. M. Urvachev, T. V. Losseva, A. N. Lyakhov, Yu. I. Zetser
Abstract
The article presents the results of a 3D numerical simulation of the dynamics of high-speed aluminum plasma jets during their injection into a highly rarefied Earth’s ionosphere, which can be considered a vacuum. The standard hydrodynamic approach is modified for taking into account the regime of supersonic injection of plasma into a vacuum. Scenarios of single and opposite injections are considered. The gas-dynamic parameters of plasma formations and their optical characteristics, obtained using standard and modified approaches, are determined.
{"title":"Numerical Simulation of the Injection of High-Speed Plasma Jets into a Vacuum","authors":"E. M. Urvachev, T. V. Losseva, A. N. Lyakhov, Yu. I. Zetser","doi":"10.1134/s1063780x23601426","DOIUrl":"https://doi.org/10.1134/s1063780x23601426","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>\u0000</h3><p>The article presents the results of a 3D numerical simulation of the dynamics of high-speed aluminum plasma jets during their injection into a highly rarefied Earth’s ionosphere, which can be considered a vacuum. The standard hydrodynamic approach is modified for taking into account the regime of supersonic injection of plasma into a vacuum. Scenarios of single and opposite injections are considered. The gas-dynamic parameters of plasma formations and their optical characteristics, obtained using standard and modified approaches, are determined.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578453","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x22602127
Q.-L. Yang, W. Chen, L.-M. Yu, P.-W. Shi, X.-Q. Ji, Zh.-B. Shi
Abstract
Laboratory observations of enhancements of energetic-electron population are presented during magnetic reconnection associated with strong tearing mode in non-disruptive tokamak plasmas. The hard X‑ray (HXR) spectrum detected by cadmium-telluride (CdTe) scintillator detectors and the non-thermal radiation measured by the electron cyclotron emission (ECE) are used to analyze the behaviors of energetic electrons on HL-2A. A population of energetic electrons is generated by parallel electric fields ({{E}_{parallel }}) during magnetic reconnection, which is evidenced by the production of hard X-rays with energy 10 keV < Eγ < 200 keV. The results could assist to better understand the acceleration mechanism of electrons in the parameter-regime of tokamak plasma. It is observed that the energetic-electrons jointly accelerated by Ohmic electric fields and parallel electric fields have significant effects on the behaviors of low frequency MHD modes, namely, which excite Alfvénic and acoustic type instabilities during strong tearing modes (TMs).
{"title":"Enhancement of Energetic-Electron Population During Magnetic Reconnection Associated with Strong Tearing Mode in Non-Disruptive HL-2A Plasmas","authors":"Q.-L. Yang, W. Chen, L.-M. Yu, P.-W. Shi, X.-Q. Ji, Zh.-B. Shi","doi":"10.1134/s1063780x22602127","DOIUrl":"https://doi.org/10.1134/s1063780x22602127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Laboratory observations of enhancements of energetic-electron population are presented during magnetic reconnection associated with strong tearing mode in non-disruptive tokamak plasmas. The hard X‑ray (HXR) spectrum detected by cadmium-telluride (CdTe) scintillator detectors and the non-thermal radiation measured by the electron cyclotron emission (ECE) are used to analyze the behaviors of energetic electrons on HL-2A. A population of energetic electrons is generated by parallel electric fields <span>({{E}_{parallel }})</span> during magnetic reconnection, which is evidenced by the production of hard X-rays with energy 10 keV < <i>E</i><sub>γ</sub> < 200 keV. The results could assist to better understand the acceleration mechanism of electrons in the parameter-regime of tokamak plasma. It is observed that the energetic-electrons jointly accelerated by Ohmic electric fields and parallel electric fields have significant effects on the behaviors of low frequency MHD modes, namely, which excite Alfvénic and acoustic type instabilities during strong tearing modes (TMs).</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578500","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601529
N. S. Artekha, D. R. Shklyar
Abstract
The article studies waves in a collisionless magnetoactive plasma with frequencies much lower than the electron cyclotron frequency at an arbitrary ratio between the electron plasma and cyclotron frequencies. A general dispersion relation is obtained for the wave frequency as a function of the wave vector and the ratio of the plasma frequency to the cyclotron frequency. This relation is a bicubic equation with respect to frequency. Based on this equation, the existence domains of various wave modes depending on the specified parameter, their group velocity, polarization, and energy density are studied. Special attention is paid to low-frequency whistler waves in a low-density plasma, since, among the propagating wave modes existing in the specified range of parameters, whistler waves have the highest refractive index and play an important role in theresonant interaction of waves and particles.
{"title":"Dispersion Characteristics of Low-Frequency Electron Waves in a Magnetoactive Plasma of Arbitrary Density","authors":"N. S. Artekha, D. R. Shklyar","doi":"10.1134/s1063780x23601529","DOIUrl":"https://doi.org/10.1134/s1063780x23601529","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article studies waves in a collisionless magnetoactive plasma with frequencies much lower than the electron cyclotron frequency at an arbitrary ratio between the electron plasma and cyclotron frequencies. A general dispersion relation is obtained for the wave frequency as a function of the wave vector and the ratio of the plasma frequency to the cyclotron frequency. This relation is a bicubic equation with respect to frequency. Based on this equation, the existence domains of various wave modes depending on the specified parameter, their group velocity, polarization, and energy density are studied. Special attention is paid to low-frequency whistler waves in a low-density plasma, since, among the propagating wave modes existing in the specified range of parameters, whistler waves have the highest refractive index and play an important role in theresonant interaction of waves and particles.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578377","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601268
I. I. Zadiriev, E. A. Kralkina, K. V. Vavilin, A. M. Nikonov, G. V. Shvidkiy
Abstract
A pulsed RF discharge is considered experimentally as a working process of an RF ion source. It is shown that an increase in the ion current can be obtained in comparison with the continuous operation mode when such a discharge is operating. This increase is the greater, the greater the difference between the characteristic time of the drop of the ion current after turning off the RF power and the rise time of the ion current when the RF power is turned on. The pulsation parameters at which the ion current is maximized are estimated. It is shown that an external constant longitudinal magnetic field in the range of 0–7.2 mT nonmonotonically affects the maximum and equilibrium value of the ion current in a pulse and does not affect the decrease rate of the ion current after the RF power is turned off.
{"title":"Pulsed Inductive RF Discharge as an Effective Working Process of an RF Ion Source","authors":"I. I. Zadiriev, E. A. Kralkina, K. V. Vavilin, A. M. Nikonov, G. V. Shvidkiy","doi":"10.1134/s1063780x23601268","DOIUrl":"https://doi.org/10.1134/s1063780x23601268","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A pulsed RF discharge is considered experimentally as a working process of an RF ion source. It is shown that an increase in the ion current can be obtained in comparison with the continuous operation mode when such a discharge is operating. This increase is the greater, the greater the difference between the characteristic time of the drop of the ion current after turning off the RF power and the rise time of the ion current when the RF power is turned on. The pulsation parameters at which the ion current is maximized are estimated. It is shown that an external constant longitudinal magnetic field in the range of 0–7.2 mT nonmonotonically affects the maximum and equilibrium value of the ion current in a pulse and does not affect the decrease rate of the ion current after the RF power is turned off.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578381","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601487
D. G. Vasil’kov, N. K. Kharchev
Abstract
Results of experiments carried out with a quasi-stationary L-2M stellarator in the regime of electron cyclotron resonance heating by means of two gyrotrons are presented. The data on increase in the plasma energy lifetime by means of modulation (profiling) of the microwave pulse are obtained. The first gyrotron operating at fixed power was used for ionization and initial heating of plasma, while the second gyrotron initiated a stationary discharge with a duration of 10 ms. It is demonstrated that the lifetime can be increased by varying the second-gyrotron power in the range of 50–200 kW. A fourfold increase in the lifetime was obtained when the second-gyrotron power was reduced to 50 kW. This work is of interest as a method of studying hot plasma confined in the toroidal magnetic system of a stellarator.
{"title":"An Increase in Plasma Energy Lifetime in the Profiled-Pulse Regime in the L-2M Stellarator","authors":"D. G. Vasil’kov, N. K. Kharchev","doi":"10.1134/s1063780x23601487","DOIUrl":"https://doi.org/10.1134/s1063780x23601487","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Results of experiments carried out with a quasi-stationary L-2M stellarator in the regime of electron cyclotron resonance heating by means of two gyrotrons are presented. The data on increase in the plasma energy lifetime by means of modulation (profiling) of the microwave pulse are obtained. The first gyrotron operating at fixed power was used for ionization and initial heating of plasma, while the second gyrotron initiated a stationary discharge with a duration of 10 ms. It is demonstrated that the lifetime can be increased by varying the second-gyrotron power in the range of 50–200 kW. A fourfold increase in the lifetime was obtained when the second-gyrotron power was reduced to 50 kW. This work is of interest as a method of studying hot plasma confined in the toroidal magnetic system of a stellarator.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578439","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}
Pub Date : 2024-01-27DOI: 10.1134/s1063780x23601505
A. I. Shloydo, A. V. Turkin
Abstract
Experiment-based computational technique for evaluation of parameters of a stationary beam plasma such as the volume average concentration of free electrons and the degree of ionization of the gas component is proposed. The power of an electron beam along with the mean free path of electrons are found from the measurements of the current-voltage characteristic and energy efficiency of the electron-beam generators. The degree of ionization of the gas mixture is calculated assuming a balance between the ionization and recombination processes of the charged particles. It is demonstrated that the dissociative recombination of particles plays the key role in plasma created by an electron beam in a gas mixture of medium pressure. The validity of the initial assumptions is estimated. Plasma characteristics in a gas mixture containing 20.9% of O2, 78.1% of N2, and 1% of H2O at pressure ranging from 1 to 2.5 kPa are calculated based on the measured current-voltage characteristics.
{"title":"Evaluation of Characteristics of Plasma Created by an Electron-Beam Generator with Gas Feeding into the Discharge Channel","authors":"A. I. Shloydo, A. V. Turkin","doi":"10.1134/s1063780x23601505","DOIUrl":"https://doi.org/10.1134/s1063780x23601505","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Experiment-based computational technique for evaluation of parameters of a stationary beam plasma such as the volume average concentration of free electrons and the degree of ionization of the gas component is proposed. The power of an electron beam along with the mean free path of electrons are found from the measurements of the current-voltage characteristic and energy efficiency of the electron-beam generators. The degree of ionization of the gas mixture is calculated assuming a balance between the ionization and recombination processes of the charged particles. It is demonstrated that the dissociative recombination of particles plays the key role in plasma created by an electron beam in a gas mixture of medium pressure. The validity of the initial assumptions is estimated. Plasma characteristics in a gas mixture containing 20.9% of O<sub>2</sub>, 78.1% of N<sub>2</sub>, and 1% of H<sub>2</sub>O at pressure ranging from 1 to 2.5 kPa are calculated based on the measured current-voltage characteristics.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578451","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}
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