Pub Date : 2024-05-02DOI: 10.1134/s1063780x23601943
S. K. H. Auluck, V. I. Krauz, V. V. Myalton, A. M. Kharrasov
Abstract
Astrophysical jets are collimated plasma outflows observed in diverse astrophysical settings covering seven decades of spatial scale and twenty decades of power, which, nevertheless, share many common features. This similarity over wide range of scales indicates a common core of physics underlying this phenomenon, leading to considerable interest in observational, theoretical and numerical studies. Laboratory astrophysics experiments for simulating astrophysical jets are premised on this common core of physics responsible for multi-scale similarity of jets remaining valid down to laboratory spatial scales of millimeters. Jets formed after the disassembly of the non-cylindrical Z-pinch formed in a plasma focus installation have recently been subjects of observational studies. They offer an important complementarity to the main lines of investigations in two respects. Firstly, the multi-faceted role of gravity, radiation, nuclear reactions and related astrophysics is eliminated retaining only a rapid implosion of a compact plasma object in a magnetohydrodynamic environment as a common feature. Secondly, observations can be made using techniques of laboratory plasma diagnostics. In this paper, we report preliminary results regarding presence of poloidal magnetic flux associated with the jets lasting long after the pinch disassembly. This is significant in the context of uncertainty regarding the origin of poloidal magnetic field postulated in several MHD models of astrophysical jet phenomena. Evidence indicating presence of a radial component of electric field suggests existence of plasma rotation as well. These results suggest that more refined experiments can provide insights into the astrophysical jetting phenomena not available from observational astronomy techniques.
{"title":"Investigation of the Poloidal Magnetic Flux at the PF-3 Plasma Focus within the Framework of the Program of Laboratory Simulation of Astrophysical Jets","authors":"S. K. H. Auluck, V. I. Krauz, V. V. Myalton, A. M. Kharrasov","doi":"10.1134/s1063780x23601943","DOIUrl":"https://doi.org/10.1134/s1063780x23601943","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Astrophysical jets are collimated plasma outflows observed in diverse astrophysical settings covering seven decades of spatial scale and twenty decades of power, which, nevertheless, share many common features. This similarity over wide range of scales indicates a common core of physics underlying this phenomenon, leading to considerable interest in observational, theoretical and numerical studies. Laboratory astrophysics experiments for simulating astrophysical jets are premised on this common core of physics responsible for multi-scale similarity of jets remaining valid down to laboratory spatial scales of millimeters. Jets formed after the disassembly of the non-cylindrical Z-pinch formed in a plasma focus installation have recently been subjects of observational studies. They offer an important complementarity to the main lines of investigations in two respects. Firstly, the multi-faceted role of gravity, radiation, nuclear reactions and related astrophysics is eliminated retaining only a rapid implosion of a compact plasma object in a magnetohydrodynamic environment as a common feature. Secondly, observations can be made using techniques of laboratory plasma diagnostics. In this paper, we report preliminary results regarding presence of poloidal magnetic flux associated with the jets lasting long after the pinch disassembly. This is significant in the context of uncertainty regarding the origin of poloidal magnetic field postulated in several MHD models of astrophysical jet phenomena. Evidence indicating presence of a radial component of electric field suggests existence of plasma rotation as well. These results suggest that more refined experiments can provide insights into the astrophysical jetting phenomena not available from observational astronomy techniques.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881739","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 : 2024-04-16DOI: 10.1134/s1063780x2360192x
R. R. Kayumov, A. I. Kuputdinova, D. N. Mirkhanov, Al. F. Gaisin
Abstract
Gas-discharge plasma generated between a metal cathode and a liquid non-metal anode at atmospheric pressure was studied. The discharge was ignited by submerging the metal electrode in the electrolyte. The types and shapes of the plasma structures generated in the interelectrode gap were considered, as well as their electrophysical parameters. The results of the thermographic analysis of the electrode surface are presented during the burning of the discharge. Emission spectroscopy was used to study the plasma composition, the electron density, and the temperature of the heavy component.
{"title":"Electrical Discharge between a Metal Cathode and a Liquid Non-Metal Anode","authors":"R. R. Kayumov, A. I. Kuputdinova, D. N. Mirkhanov, Al. F. Gaisin","doi":"10.1134/s1063780x2360192x","DOIUrl":"https://doi.org/10.1134/s1063780x2360192x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Gas-discharge plasma generated between a metal cathode and a liquid non-metal anode at atmospheric pressure was studied. The discharge was ignited by submerging the metal electrode in the electrolyte. The types and shapes of the plasma structures generated in the interelectrode gap were considered, as well as their electrophysical parameters. The results of the thermographic analysis of the electrode surface are presented during the burning of the discharge. Emission spectroscopy was used to study the plasma composition, the electron density, and the temperature of the heavy component.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881742","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 : 2024-04-16DOI: 10.1134/s1063780x2360202x
V. P. Afanas’ev, L. G. Lobanova
Abstract
A theoretical description of reflection of hydrogen isotopes from a solid body based on data available in modern literature on the cross sections for elastic and inelastic scattering of ions is presented. The results of the analytical calculation are compared with the results of computer simulation and experimental data. The interaction of hydrogen isotopes with energies from 300 eV to 25 keV with materials in a wide range of atomic numbers, namely Be, C, Ti, Ni, W, Au, is considered. A critical review of existing analytical models of multiple scattering of light ions in solids is performed.
摘要 根据现代文献中有关离子弹性和非弹性散射截面的数据，对氢同位素从固体中的反射进行了理论描述。分析计算结果与计算机模拟结果和实验数据进行了比较。研究考虑了能量从 300 eV 到 25 keV 的氢同位素与各种原子序数的材料（即 Be、C、Ti、Ni、W、Au）之间的相互作用。对固体中光离子多重散射的现有分析模型进行了批判性评述。
{"title":"Analytical Theory of Reflection of Hydrogen Isotopes of Thermonuclear Energies from Construction Materials","authors":"V. P. Afanas’ev, L. G. Lobanova","doi":"10.1134/s1063780x2360202x","DOIUrl":"https://doi.org/10.1134/s1063780x2360202x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A theoretical description of reflection of hydrogen isotopes from a solid body based on data available in modern literature on the cross sections for elastic and inelastic scattering of ions is presented. The results of the analytical calculation are compared with the results of computer simulation and experimental data. The interaction of hydrogen isotopes with energies from 300 eV to 25 keV with materials in a wide range of atomic numbers, namely Be, C, Ti, Ni, W, Au, is considered. A critical review of existing analytical models of multiple scattering of light ions in solids is performed.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140613559","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 : 2024-04-16DOI: 10.1134/s1063780x23602067
N. A. Emelyanov, V. V. Kocharovsky
Abstract
For plasma with anisotropic velocity distribution of particles in the form of two counter-propagating bi-Maxwellian beams, including bi-Maxwellian plasma, in the presence of external magnetic field parallel to the beams, it is shown that in a wide range of parameters, particle collisions lead to the expansion of the wavenumbers range, generally towards the long-wavelength region, and weaken the conditions for the occurrence of the Weibel-type instability. In the specified expanded range, its growth rate, found by means of solving the dispersion equation for the wave vectors orthogonal to the external magnetic field, turns out to be less than or on the order of the frequency of particle collisions. Thus, in this range of parameters, the instability development and formation of large-scale magnetic turbulence in a plasma with weak particle collisions require the long-term injection of particles with anisotropic velocity distribution.
{"title":"Collisional Mechanism of Expanding Wavenumbers Range of Weibel-Type Instability in Magnetoactive Plasma","authors":"N. A. Emelyanov, V. V. Kocharovsky","doi":"10.1134/s1063780x23602067","DOIUrl":"https://doi.org/10.1134/s1063780x23602067","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>For plasma with anisotropic velocity distribution of particles in the form of two counter-propagating bi-Maxwellian beams, including bi-Maxwellian plasma, in the presence of external magnetic field parallel to the beams, it is shown that in a wide range of parameters, particle collisions lead to the expansion of the wavenumbers range, generally towards the long-wavelength region, and weaken the conditions for the occurrence of the Weibel-type instability. In the specified expanded range, its growth rate, found by means of solving the dispersion equation for the wave vectors orthogonal to the external magnetic field, turns out to be less than or on the order of the frequency of particle collisions. Thus, in this range of parameters, the instability development and formation of large-scale magnetic turbulence in a plasma with weak particle collisions require the long-term injection of particles with anisotropic velocity distribution.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140609731","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 : 2024-04-16DOI: 10.1134/s1063780x23602031
A. A. Inzhevatkina, I. A. Ivanov, V. V. Postupaev, A. V. Sudnikov, M. S. Tolkachev, V. O. Ustyuzhanin
Abstract
The physics of confinement of plasma rotating in the magnetic field with linear helical symmetry is studied at the SMOLA open trap at Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences. The factor characterizing the quality of plasma confinement in the system is its flow velocity. The paper describes the diagnostics applied, which is based on the Mach probe used under the conditions of nonmagnetized plasma; this diagnostics made it possible to determine the longitudinal flow velocity in the experiments. In different operating regimes of the device, the measured longitudinal flow velocity was (0.5−5) × 106 cm/s. It is discussed how the velocity depends on the magnetic field corrugation. The reverse flow of trapped particles returning to the confinement zone was detected.
摘要 在俄罗斯科学院西伯利亚分院布德克核物理研究所（Budker Institute of Nuclear Physics of the Siberian Branch）的SMOLA开放式陷阱中，研究了在磁场中旋转的等离子体的线性螺旋对称约束物理学。系统中等离子体约束质量的表征因素是其流动速度。论文介绍了基于在非磁化等离子体条件下使用的马赫探针的诊断方法；该诊断方法使得确定实验中的纵向流速成为可能。在设备的不同工作状态下，测得的纵向流速为 (0.5-5) × 106 厘米/秒。本文讨论了纵向流速与磁场波纹的关系。检测到被捕获的粒子反向流回禁锢区。
{"title":"Investigation of Plasma Flow Velocity in the Helical Magnetic Open Trap SMOLA","authors":"A. A. Inzhevatkina, I. A. Ivanov, V. V. Postupaev, A. V. Sudnikov, M. S. Tolkachev, V. O. Ustyuzhanin","doi":"10.1134/s1063780x23602031","DOIUrl":"https://doi.org/10.1134/s1063780x23602031","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The physics of confinement of plasma rotating in the magnetic field with linear helical symmetry is studied at the SMOLA open trap at Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences. The factor characterizing the quality of plasma confinement in the system is its flow velocity. The paper describes the diagnostics applied, which is based on the Mach probe used under the conditions of nonmagnetized plasma; this diagnostics made it possible to determine the longitudinal flow velocity in the experiments. In different operating regimes of the device, the measured longitudinal flow velocity was (0.5−5) × 10<sup>6</sup> cm/s. It is discussed how the velocity depends on the magnetic field corrugation. The reverse flow of trapped particles returning to the confinement zone was detected.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881774","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 : 2024-04-16DOI: 10.1134/s1063780x23601761
S. I. Popel, Yu. N. Izvekova, A. P. Golub’
Abstract
The anomalous dissipation related to the effect of charging of dust particles that gives rise to new physical phenomena, effects, and mechanisms represents one of the main specific features of dusty plasma that makes it different from conventional plasma containing no charged dust particles. We analyze the process of anomalous dissipation in the context of description of the dynamics of dust particles in dusty plasma of the Mercury’s exosphere. An analytical description of oscillations of a dust particle above the surface of Mercury is presented. The frequency of charging of dust particles that characterizes the anomalous dissipation determines the damping of such oscillations. It is demonstrated that the anomalous dissipation is important for substantiation of the model of levitating dust particles that is used for description of dusty plasma above Mercury. The results of numerical simulations that justify the use of the discussed model are presented.
{"title":"On Anomalous Dissipation in Plasma of Dusty Mercury’s Exosphere","authors":"S. I. Popel, Yu. N. Izvekova, A. P. Golub’","doi":"10.1134/s1063780x23601761","DOIUrl":"https://doi.org/10.1134/s1063780x23601761","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The anomalous dissipation related to the effect of charging of dust particles that gives rise to new physical phenomena, effects, and mechanisms represents one of the main specific features of dusty plasma that makes it different from conventional plasma containing no charged dust particles. We analyze the process of anomalous dissipation in the context of description of the dynamics of dust particles in dusty plasma of the Mercury’s exosphere. An analytical description of oscillations of a dust particle above the surface of Mercury is presented. The frequency of charging of dust particles that characterizes the anomalous dissipation determines the damping of such oscillations. It is demonstrated that the anomalous dissipation is important for substantiation of the model of levitating dust particles that is used for description of dusty plasma above Mercury. The results of numerical simulations that justify the use of the discussed model are presented.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140609725","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 : 2024-04-16DOI: 10.1134/s1063780x23602080
G. M. Asadulin, N. A. Kirneva, I. S. Bel’bas, A. V. Gorshkov, D. S. Panfilov, S. V. Krylov, A. P. Nemets, D. S. Sergeev, N. A. Solov’ev
Abstract
At the T-10 tokamak, the Thomson scattering diagnostics was upgraded in 2016. The new system is based on the Nd:YAG laser with the pulse repetition frequency of 100 Hz; the measurements can be performed every 10 ms during the entire plasma discharge at the spatial resolution of up to 5 mm. Using the upgraded diagnostics, the electron temperature measurements were performed during experimental campaigns of the T-10 tokamak in 2016−2018. In the regimes with the electron cyclotron resonance heating, it was demonstrated that the regions with increased temperature gradients form in the plasma, which was interpreted as the formation of internal transport barrier. The ASTRA-code-based simulations of the current profile time evolution made it possible to correlate the positions of the barrier and the rational surface q = 1.
{"title":"Detection of Internal Transport Barrier in the T-10 Tokamak Using Thomson Scattering Diagnostics","authors":"G. M. Asadulin, N. A. Kirneva, I. S. Bel’bas, A. V. Gorshkov, D. S. Panfilov, S. V. Krylov, A. P. Nemets, D. S. Sergeev, N. A. Solov’ev","doi":"10.1134/s1063780x23602080","DOIUrl":"https://doi.org/10.1134/s1063780x23602080","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>At the T-10 tokamak, the Thomson scattering diagnostics was upgraded in 2016. The new system is based on the Nd:YAG laser with the pulse repetition frequency of 100 Hz; the measurements can be performed every 10 ms during the entire plasma discharge at the spatial resolution of up to 5 mm. Using the upgraded diagnostics, the electron temperature measurements were performed during experimental campaigns of the T-10 tokamak in 2016−2018. In the regimes with the electron cyclotron resonance heating, it was demonstrated that the regions with increased temperature gradients form in the plasma, which was interpreted as the formation of internal transport barrier. The ASTRA-code-based simulations of the current profile time evolution made it possible to correlate the positions of the barrier and the rational surface <i>q</i> = 1.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140609889","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 : 2024-04-16DOI: 10.1134/s1063780x23601736
V. F. Tarasenko, N. P. Vinogradov, E. Kh. Baksht, D. S. Pechenitsyn
Abstract
In air at a pressure of 1 Torr, the regime of collision of plasma diffuse jets (PDJ) that consist of red streamers was studied. The PDJ were formed by sending voltage pulses at a frequency of 21 kHz in a quartz tube, and they started from the plasma of a capacitive discharge that was created by the voltage pulses of positive and negative polarity. It is shown that when the pulse polarity is the same, the opposite PDJs in air suppress each other’s radiation from the 2+ and 1+ systems of molecular nitrogen. It is also shown that at the opposite polarity of the voltage pulses, the intensity of radiation in the PDJ collision region increases substantially. The data is provided on the effect of the delay between the switching on of the generators of opposite polarity on the PDJ radiation spectra. It is shown that, when the relative air humidity is increased, lines of atomic nitrogen Hα appear in the spectrum as well as the hydroxyl molecular bands OH and OH+, whose spectral radiation energy density is commensurate with the energy density of the second positive (2+) system of molecular nitrogen.
{"title":"Collision of Two Plasma Diffuse Jets with the Same and Opposite Front Polarities at Air Pressure of 1 Torr","authors":"V. F. Tarasenko, N. P. Vinogradov, E. Kh. Baksht, D. S. Pechenitsyn","doi":"10.1134/s1063780x23601736","DOIUrl":"https://doi.org/10.1134/s1063780x23601736","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In air at a pressure of 1 Torr, the regime of collision of plasma diffuse jets (PDJ) that consist of red streamers was studied. The PDJ were formed by sending voltage pulses at a frequency of 21 kHz in a quartz tube, and they started from the plasma of a capacitive discharge that was created by the voltage pulses of positive and negative polarity. It is shown that when the pulse polarity is the same, the opposite PDJs in air suppress each other’s radiation from the 2+ and 1+ systems of molecular nitrogen. It is also shown that at the opposite polarity of the voltage pulses, the intensity of radiation in the PDJ collision region increases substantially. The data is provided on the effect of the delay between the switching on of the generators of opposite polarity on the PDJ radiation spectra. It is shown that, when the relative air humidity is increased, lines of atomic nitrogen H<sub>α</sub> appear in the spectrum as well as the hydroxyl molecular bands OH and OH<sup>+</sup>, whose spectral radiation energy density is commensurate with the energy density of the second positive (2+) system of molecular nitrogen.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140613475","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 : 2024-04-16DOI: 10.1134/s1063780x23601785
A. M. Nikonov, K. V. Vavilin, I. I. Zadiriev, S. A. Dvinin, E. A. Kral’kina
Abstract
The properties of an inductive RF discharge placed in a longitudinal external magnetic field with an induction of less than 70 G at frequencies of 2, 4, and 13.56 MHz are studied. The dependences of the region of existence of the discharge, the efficiency of the RF power input and the structure of the RF magnetic field on the external magnetic field induction are studied experimentally. The experimental results are compared with calculations based on a previously developed electromagnetic discharge model. It is shown that the local maximum of the plasma density observed at weak magnetic fields is associated with the resonant excitation of waves in the plasma source. The excited wave is close to a transverse helicon at a frequency of 2 MHz, and its properties approach the Trivelpiece–Gould wave at a frequency of 13.56 MHz,.
{"title":"Frequency Dependence of Parameters of an Inductive RF Discharge Placed in a Weak Magnetic Field","authors":"A. M. Nikonov, K. V. Vavilin, I. I. Zadiriev, S. A. Dvinin, E. A. Kral’kina","doi":"10.1134/s1063780x23601785","DOIUrl":"https://doi.org/10.1134/s1063780x23601785","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The properties of an inductive RF discharge placed in a longitudinal external magnetic field with an induction of less than 70 G at frequencies of 2, 4, and 13.56 MHz are studied. The dependences of the region of existence of the discharge, the efficiency of the RF power input and the structure of the RF magnetic field on the external magnetic field induction are studied experimentally. The experimental results are compared with calculations based on a previously developed electromagnetic discharge model. It is shown that the local maximum of the plasma density observed at weak magnetic fields is associated with the resonant excitation of waves in the plasma source. The excited wave is close to a transverse helicon at a frequency of 2 MHz, and its properties approach the Trivelpiece–Gould wave at a frequency of 13.56 MHz,.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140613879","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 : 2024-04-16DOI: 10.1134/s1063780x2460004x
Yu. S. Akishev, V. P. Bakhtin, A. B. Buleyko, O. T. Loza, A. V. Petryakov, A. A. Ravaev, E. A. Fefelova
Abstract
The results of experimental studies on the formation and subsequent evolution of extended (l = 300 mm) and thin-walled (Δr ≈ 10 mm) tubular (2r ≈ 110 mm) plasma in a weak longitudinal magnetic field (B = 175 G) without the use of a thermionic cathode are presented. The cylindrical chamber in which the tubular plasma was formed was pumped with high purity argon (99.998%) at an average velocity of about 1 m/s at a pressure of P = 10–3–10–2 Torr. Two methods of creating seed electrons initiating the development of ionization avalanches were used. The difference inherent to these methods has been established in the dynamics of breakdown, completing in the formation of a tubular discharge. In the first of them, a pulsed discharge preceding the high voltage supply of the main discharge created gas preionization in a small area around the sectioned cathodes. In the second method, seed electrons were created in the entire working area of the discharge chamber by an RF discharge with a frequency of 85 kHz and duration of about 1 s. High-speed shooting with a 4-frame ICCD camera allowed us to establish the dynamics of tubular discharge formation at all its stages. Measurements of the longitudinal and radial discharge current were carried out. The results we obtained showed the possibility of spatial isolation of an extended tubular plasma from the close located metal wall of the discharge chamber by using a weak longitudinal magnetic field.
{"title":"Formation of Extended Tubular Plasma in Argon at Low Pressure and in a Weak Longitudinal Magnetic Field","authors":"Yu. S. Akishev, V. P. Bakhtin, A. B. Buleyko, O. T. Loza, A. V. Petryakov, A. A. Ravaev, E. A. Fefelova","doi":"10.1134/s1063780x2460004x","DOIUrl":"https://doi.org/10.1134/s1063780x2460004x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of experimental studies on the formation and subsequent evolution of extended (<i>l</i> = 300 mm) and thin-walled (Δ<i>r</i> ≈ 10 mm) tubular (2<i>r</i> ≈ 110 mm) plasma in a weak longitudinal magnetic field (<i>B</i> = 175 G) without the use of a thermionic cathode are presented. The cylindrical chamber in which the tubular plasma was formed was pumped with high purity argon (99.998%) at an average velocity of about 1 m/s at a pressure of <i>P</i> = 10<sup>–3</sup>–10<sup>–2</sup> Torr. Two methods of creating seed electrons initiating the development of ionization avalanches were used. The difference inherent to these methods has been established in the dynamics of breakdown, completing in the formation of a tubular discharge. In the first of them, a pulsed discharge preceding the high voltage supply of the main discharge created gas preionization in a small area around the sectioned cathodes. In the second method, seed electrons were created in the entire working area of the discharge chamber by an RF discharge with a frequency of 85 kHz and duration of about 1 s. High-speed shooting with a 4-frame ICCD camera allowed us to establish the dynamics of tubular discharge formation at all its stages. Measurements of the longitudinal and radial discharge current were carried out. The results we obtained showed the possibility of spatial isolation of an extended tubular plasma from the close located metal wall of the discharge chamber by using a weak longitudinal magnetic field.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140609894","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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