Fundamental Plasma Physics最新文献

{"title":"Spherical nonthermal pulsational mode stability thermo-statistically moderated with extra-negative ions","authors":"Jonmoni Dutta ,&nbsp;Ahmed Atteya ,&nbsp;Pralay Kumar Karmakar","doi":"10.1016/j.fpp.2025.100087","DOIUrl":"10.1016/j.fpp.2025.100087","url":null,"abstract":"<div><div>The presence of diverse negative ions is well-known to modify different collective waves and instabilities in diverse space and astrophysical environments. We herein investigate the stability dynamics of the spherical nonthermal (kappa-modified) pulsational mode of gravitational collapse (PMGC) excitable in astrophysical dust molecular clouds (DMCs). It primarily explores the impact of the realistic nonthermal negative ionic effects on the PMGC stability features. The high-energetic lighter constituents, such as the electrons, positive ions, and negative ions, are modelled with their respective nonthermal kappa (<span><math><mi>κ</mi></math></span>)-distribution laws. The inertial dust particulates are treated in the viscous fluid fabric. Application of spherical normal mode treatment results in a generalized linear quartic (degree-4) dispersion relation. A computational illustrative platform illuminates the underlying stabilizing and destabilizing factors. It is seen that the cloud size, dust mass, dust charge, nonthermality parameters, equilibrium charged dust number density, and neutral dust viscosity play stabilizing roles. It counters the destabilizing scenarios caused by the equilibrium electron number density, positive ion number density, negative ion number density, neutral dust density, and charged dust viscosity. The fundamental physical mechanisms responsible herein are substantiated and compared in light of the previous predictions. The nontrivial avenues of our study in realizing the Jeans-driven galactic structural unit formation processes, moderated actively with the presence of negative ions in diverse real astronomical circumstances are summarily indicated.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"14 ","pages":"Article 100087"},"PeriodicalIF":0.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiative damping of toroidal Alfvén eigenmode in low-shear plasmas","authors":"B.N. Breizman ,&nbsp;S.E. Sharapov","doi":"10.1016/j.fpp.2025.100086","DOIUrl":"10.1016/j.fpp.2025.100086","url":null,"abstract":"<div><div>Instabilities of Alfvén eigenmodes (AEs) are of significant concern because they can enhance the cross-field transport of fusion-born alpha particles beyond the neoclassical level in magnetic fusion plasmas. The threshold value of alpha-particle pressure for exciting AEs depends critically on the damping rate of AEs. The damping mechanisms include kinetic damping due to interactions with thermal particles, continuum damping due to AE frequency crossing Alfvén continuum, and radiative damping due to emitting kinetic Alfvén waves (KAWs). The radiative damping is substantial and can even prevail in high-temperature burning plasmas [1]. We revisit the radiative damping analytic theory for TAE in plasmas with low positive magnetic shear, considering TAE with an eigenfrequency near the bottom of TAE-gap and with poloidal harmonics of the same sign (even TAE). In contrast to earlier papers, we provide the damping calculations in real space rather than Fourier space. This approach is straightforward technically and more enlightening from a physics standpoint for benchmarking numerical calculations of radiative damping. The parametric dependence of the resulting damping rate agrees with that of Refs. [2-5], but it has a smaller numerical factor in front of it.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"13 ","pages":"Article 100086"},"PeriodicalIF":0.0,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High energy gain of ion-driven flux compression in cylindrical target with initial power-law radial density profile","authors":"Soheil Khoshbinfar","doi":"10.1016/j.fpp.2025.100085","DOIUrl":"10.1016/j.fpp.2025.100085","url":null,"abstract":"<div><div>The magnetized target fusion (MTF) concept is considered an economic way to harness fusion energy that resides between two ICF and MCF pathways. Here, we have proposed a new DT fuel initial density profile that improves final fusion yield in cylindrical targets in MTF. We have employed the Deira-4 MHD code to investigate the performance of these configurations. The potential advantage of an initial density gradient over a common uniform profile assumption in inertial fusion energy is its higher energy gain at the cost of lower input driver energy. It was shown that its energy gain is higher by a factor of two and reduction in driver input energy by a factor of three for a fixed DT fuel mass regime, m_DT∼2.2 mg. The radial density profile of DT fuel also promises to make larger targets that work at a sub-MJ regime which resolves our concern about the Rayleigh-Taylor instability growth rate during the implosion phase. It has also been shown that the best results with a seed axial magnetic field ∼10 T would be achieved for a power-law density profile, ρ∝rⁿ, with an exponent n=3. Moreover, the optimal target geometry attains for initial aspect ratio of ∼15 and ignition threshold reduced from &lt;ρR&gt;_DT,th=0.56 g/cm² in uniform density of DT fuel to the power law density profile of ρ∝r³ to &lt;ρR&gt;_DT,th =0.21 g/cm².</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"13 ","pages":"Article 100085"},"PeriodicalIF":0.0,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solution of the linear wave-particle kinetic equation for global modes of arbitrary frequency in a tokamak","authors":"M. Fitzgerald ,&nbsp;B.N. Breizman","doi":"10.1016/j.fpp.2025.100084","DOIUrl":"10.1016/j.fpp.2025.100084","url":null,"abstract":"<div><div>The linear response of a plasma to perturbations of arbitrary frequency and wavelength is derived for any axisymmetric magnetized toroidal plasma. An explicit transformation to action-angle coordinates is achieved using orthogonal magnetic coordinates and the Littlejohn Lagrangian, establishing the validity of this result to arbitrary order in normalized Larmor radius. The global resonance condition for compressional modes is clarified in more detail than in previous works, confirming that the poloidal orbit-average of the cyclotron frequency gives the desired result at lowest order in Larmor radius. The global plasma response to the perturbation at each resonance is captured by a poloidal and gyroaverage of the perturbing potential. A “global gyroaveraging” of the potential is a natural by-product of this analysis which takes into account the changing of the magnetic field over an orbit. The resonance condition depends on two arbitrary integers which completely separately capture the effects poloidal non-uniformity and finite Larmor radius in generating sidebands. We learn that poloidal sidebands generated for compressional modes are dominated by the change in gyrofrequency over the orbit, which is very different to shear modes where the gyrofrequency only contributes via a finite Larmor radius effect. This increases the number of bounce harmonics required to compute the linear drive, giving a more complicated resonance map. An example calculation is given comparing resonance of shear and compressional modes in a published DIII-D case.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"13 ","pages":"Article 100084"},"PeriodicalIF":0.0,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"N-body simulation of spinning particle pairs in a complex plasma crystal","authors":"Zachary Watson ,&nbsp;Parker Adamson ,&nbsp;Jorge Martinez-Ortiz ,&nbsp;Katrina Vermillion ,&nbsp;Calvin Carmichael ,&nbsp;Samuel Garcia-Rodriguez ,&nbsp;Lorin Matthews ,&nbsp;Truell Hyde ,&nbsp;Bryant Wyatt","doi":"10.1016/j.fpp.2024.100082","DOIUrl":"10.1016/j.fpp.2024.100082","url":null,"abstract":"<div><div>Complex plasma, consisting of ionized gas mixed with micron-sized dust particles, exhibit unique behaviors due to the mass disparity between dust grains and other plasma components. These disparities result in non-Hamiltonian dynamics that pose significant challenges for numerical modeling. Under specific conditions, the dust grains self-organize into crystal structures, driven by ion wakefields and subject to imperfections that induce dynamic phenomena like torsions—where dust grains couple and exhibit elliptical motion within the crystal lattice.</div><div>To better understand these phenomena, we developed a near real-time interactive computer model grounded in laboratory conditions, specifically replicating the environment within a GEC RF reference cell. This model addresses the challenges of stiffness in differential equations by employing an innovative point charge approach, where each point charge is dynamically influenced by all dust grains, enhancing the model's accuracy and responsiveness. The system allows for user interaction, enabling the manipulation of parameters and near real-time observation of dust behavior. Our approach balances computational efficiency with the ability to simulate complex plasma dynamics, providing a powerful tool for the study of dusty plasma crystals.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"13 ","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum regarding missing disclaimer statements in previously published articles","authors":"","doi":"10.1016/j.fpp.2024.100075","DOIUrl":"10.1016/j.fpp.2024.100075","url":null,"abstract":"","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"12 ","pages":"Article 100075"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Frontiers of plasma physics and technology 2023","authors":"Tara Desai","doi":"10.1016/j.fpp.2024.100073","DOIUrl":"10.1016/j.fpp.2024.100073","url":null,"abstract":"","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"12 ","pages":"Article 100073"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physicochemical properties and antimicrobial efficacy of argon cold atmospheric pressure plasma jet activated liquids – a comparative study","authors":"Sarthak Das ,&nbsp;Sarita Mohapatra ,&nbsp;Satyananda Kar","doi":"10.1016/j.fpp.2024.100078","DOIUrl":"10.1016/j.fpp.2024.100078","url":null,"abstract":"<div><div>Cold atmospheric pressure plasma jet activated liquids (CAPJALs) have attracted considerable scientific attention due to their peculiar antimicrobial characteristics. In the current context, there is a need to compare the bactericidal activity of CAPJALs and demonstrate the specific parameters necessary to obtain greater effectiveness. This in-vitro research examines the antimicrobial activity of liquids, such as deionized water (DI-W), drinking water (DW), tap water (TW), and normal saline (NS) activated by Ar cold atmospheric pressure plasma jet (CAPJ) against multidrug-resistant (MDR) <em>E. coli</em> and <em>S. aureus</em>. The computed <em>D-</em> value showed that CAPJALs' bacterial inactivation efficacy followed the trend – DI-W ≈ NS &gt; DW &gt; TW for both the isolates. To obtain greater bactericidal effectiveness, an optimum combination of liquid activation time by CAPJ and CAPJAL – bacteria interaction time was noticed. In addition, the rate at which the physicochemical parameters (pH, electrical conductivity (EC), total dissolved solids (TDS), and concentration of reactive species (H₂O₂, NO₃^-, and NO₂^-)) changed within the liquid varied in different ways. It was observed that the identified gas-phase species (Ar I, Ar⁺, N₂, N₂⁺, O I, OH•, OH⁺, NO⁺, O₂⁺, N₂O₃^-, NO₃^-, N₂O₂^-, etc.) would contribute to modification of liquid physicochemical property by generating liquid phase reactive species (NO₃^-, NO₂^-, H⁺, H₂O₂, ONOOH, Cl₂, HOCl, etc.) via reaction cascades. These reactive species in the liquid phase, together with other physicochemical characteristics, were found to play a part in the process of bacterial inactivation. This study into the underlying mechanism of CAPJ – liquid and CAPJAL – bacteria interaction would help to determine its potential use as a disinfectant in healthcare settings.</div></div><div><h3>List of microorganisms</h3><div><em>E. coli: Escherichia coli; S. aureus: Staphylococcus aureus</em>.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"12 ","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early applications of Neural Networks to plasma science: Architectures, solutions, and impact.","authors":"Savino Longo","doi":"10.1016/j.fpp.2024.100077","DOIUrl":"10.1016/j.fpp.2024.100077","url":null,"abstract":"<div><div>Many applications of Neural Networks (NN) to plasma science have appeared in the last years. The author describes here some of the early applications of NNs to plasma science at the beginning of the 90 s, when multi-layer, feed-forward-back-propagation (FFBP) architectures found several applications in this field: they were used to solve inversion problems, to create complete sets of input data, to replace time-consuming modules in models and to predict the outcome of real processes. From a partially personal perspective the author reviews the details of plasma problems to which NNs were successfully applied, and those of the related architectures. It turns out that some solutions, which are perceived today as marking the difference between the previous and contemporary NNs application practices, were in common use &gt;30 years ago when they were deemed fruitful. This can help create deeper historical insight into a field that is getting much attention today.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"12 ","pages":"Article 100077"},"PeriodicalIF":0.0,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ionospheric plasma irregularities over Dronning Maud Land in Antarctica and associated space weather effects","authors":"Wojciech J. Miloch,&nbsp;Daria S. Kotova,&nbsp;Yaqi Jin","doi":"10.1016/j.fpp.2024.100076","DOIUrl":"10.1016/j.fpp.2024.100076","url":null,"abstract":"<div><div>Ionospheric plasma irregularities and associated space weather effects over Dronning Maud Land in Antarctica are studied with a multi-instrument approach. It is demonstrated during a substorm event that auroral particle precipitation associated with the edges of auroral arcs can lead to irregularities in the ionospheric plasma density that can have significant impact on trans-ionospheric radio waves. Both refractive and diffractive effects are observed on signals from the GNSS satellites, where the latter are identified by the ionospheric free linear combination approach and amplitude scintillation. Thus, intense auroral particle precipitation can lead to plasma irregularities at scales from several kilometers down to and below the Fresnel radius, and they can result in space weather effects which can lead to losing the integrity of the GNSS signals.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"12 ","pages":"Article 100076"},"PeriodicalIF":0.0,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}