William Barham , Philip J. Morrison , Eric Sonnendrücker
{"title":"A Hamiltonian and geometric formulation of general Vlasov-Maxwell-type models","authors":"William Barham , Philip J. Morrison , Eric Sonnendrücker","doi":"10.1016/j.fpp.2023.100016","DOIUrl":"https://doi.org/10.1016/j.fpp.2023.100016","url":null,"abstract":"<div><p>Three geometric formulations of the Hamiltonian structure of the macroscopic Maxwell equations are given: one in terms of the double de Rham complex, one in terms of <span><math><msup><mi>L</mi><mn>2</mn></msup></math></span> duality, and one utilizing an abstract notion of duality. The final of these is used to express the geometric and Hamiltonian structure of kinetic theories in general media. The Poisson bracket so stated is explicitly metric free. Finally, as a special case, the Lorentz covariance of such kinetic theories is investigated. We obtain a Lorentz covariant kinetic theory coupled to nonlinear electrodynamics such as Born-Infeld or Euler-Heisenberg electrodynamics.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"5 ","pages":"Article 100016"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50203492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Formation and Ejection of Helical Plasma Structures from Gravitational Wave Emitters","authors":"B. Coppi","doi":"10.1016/j.fpp.2022.100007","DOIUrl":"https://doi.org/10.1016/j.fpp.2022.100007","url":null,"abstract":"<div><p>Helical plasma structures have been identified and shown to form in and propagate from the high density plasmas in which Black Hole binaries can be imbedded. These structures are envisioned to extend to very low density and distant plasma regions up to where they can be disrupted by encountering plasma patches where the waves, of which the structures are composed, become dissipated. By now experimental observations and analyses of the morphology of jets have found that they can involve double-helix magnetic topologies in one case and, more recently, a single helix in other cases. Thus, plasma structures originating in the plasmas surrounding binary systems are proposed, instead of particle beams emitted by black holes directly, as a possible explanation of the origin of the highly collimated jets associated with a variety of celestial objects that are currently observed. Theoretically, double-helix structures are found to emerge as non-linearly coupled torsional ion-sound waves which, in the presence of a background magnetic field, in both the formation and terminal plasmas generate helical magnetic field configurations while remaining nearly “electrostatic” in regions where no significant background magnetic field is present. These (helical) structures can propagate independently in either of the two vertical directions. The coupling involves Intrinsic Gravitational Modes originating in the circumbinary disk and Inner Gravitational Fluctuations emerging from the Swept (Toroidal) Regions carved, within the highest density plasma region, by one or both Black Holes.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"4 ","pages":"Article 100007"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50203975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Observation of poloidal magnetic flux emission from the post-pinch phase of a plasma focus and its significance for laboratory simulation of astrophysical jets","authors":"S.K.H. Auluck , A.B. Blagoev","doi":"10.1016/j.fpp.2023.100012","DOIUrl":"https://doi.org/10.1016/j.fpp.2023.100012","url":null,"abstract":"<div><p>Astrophysical jets are plasma flows, which are observed to substantially maintain their transverse size while travelling distances orders-of-magnitude larger. They are found in many astrophysical contexts, spanning several decades in energy and size, suggesting operation of an underlying scale-invariant mechanism. Similar phenomena observed in laboratory plasmas are often studied as surrogate models for astrophysical jets under the conjecture that the scale-invariance of that as-yet-unconfirmed mechanism continues to hold down to laboratory spatial and energy scales. The plasma focus is one such laboratory plasma device which offers the advantage of diagnostic accessibility at a relatively modest resource cost. The present paper uses the plasma focus to address one of the intriguing aspects of the astrophysical jet phenomenon. Theoretical models of astrophysical jets require presence of a poloidal magnetic flux but there is no observational basis for assuming its existence. Indeed, there is a fundamental theoretical impossibility of existence of poloidal magnetic flux in the natural symmetry of the jet phenomena about its axis in the context of magnetohydrodynamics. The next best evidence in support of the poloidal magnetic flux hypothesis of such theoretical models would be to look for it in surrogate experimental simulations of astrophysical jets. In this context, this paper demonstrates a new diagnostic method for detection of poloidal magnetic flux emission from a plasma focus. The results indicate that poloidal magnetic flux continues to be emitted even after the disruption of the plasma focus pinch phase and shows evidence of its being decoupled from the externally supplied discharge current. This observation is interpreted along with previous knowledgebase in terms of a conjecture regarding the scale-invariant mechanism that might also be involved in astrophysical jet phenomena.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"4 ","pages":"Article 100012"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50203973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Exact expression for the hot plasma conductivity kernel in configuration space","authors":"Mike Machielsen , Joey Rubin , Jonathan Graves","doi":"10.1016/j.fpp.2023.100008","DOIUrl":"https://doi.org/10.1016/j.fpp.2023.100008","url":null,"abstract":"<div><p>Electromagnetic perturbations of a magnetized plasma cause induced charges and currents, collectively known as the plasma response. In the frequency domain, this response is a non-local functional of the electric field. The associated integral kernel, known as the conductivity kernel, is well known in wave-number space, assuming the special case of a homogeneous plasma with a given Maxwellian background distribution function. It is used in this form by many full-wave codes. However, it may be more advantageous to solve the wave problem using a finite element model because of its attractive meshing flexibility. In this paper an exact solution for the conductivity kernel is derived in configuration space, to our knowledge for the first time in 3D. It is valid to all orders in Larmor radius, and up to arbitrary cyclotron harmonic. Future finite element models can be easily constructed using this kernel, which is shown in two simple examples. The model includes mode conversion as well, demonstrated by the second example.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"3 ","pages":"Article 100008"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50204275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Map of suprathermal onto nonextensive parameters describing Langmuir waves","authors":"F.E.M. Silveira , M.H. Benetti","doi":"10.1016/j.fpp.2022.100006","DOIUrl":"https://doi.org/10.1016/j.fpp.2022.100006","url":null,"abstract":"<div><p>We propose a polytropic-like index that depends on the concentration and number of degrees of freedom of a gas of charged particles following a nonextensive distribution. An equation of state of the gas is obtained and a dispersion relation describing Langmuir waves is derived. Comparison of the acquired dispersion relation with a previous one, recently deduced in the realm of the Kappa distribution, provides an adiabatic map of suprathermal onto nonextensive parameters. In the isothermal limit, the map recovers a well-known relation between those quantities. The results presented here may be useful for investigating the physics of coupled and weakly interacting systems in the nonextensive framework.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"3 ","pages":"Article 100006"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50204274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Scaling law for interchange transport in magnetically confined electron-positron plasmas with ion impurity","authors":"M. Kühbauch, A. Kendl","doi":"10.1016/j.fpp.2022.09.001","DOIUrl":"10.1016/j.fpp.2022.09.001","url":null,"abstract":"<div><p>Interchange instabilities are a critical issue for confinement and transport in (otherwise exceptionally stable) planned magnetically confined quasi-neutral electron-positron plasma experiments. An additional ion impurity concentration can signifcantly affect the instability. The dispersion relation for interchange modes in perturbed inhomogeneously magnetized electron-positron plasmas in the presence of impurity ions is derived from full-f isothermal gyrofluid equations. The model includes arbitrary ion concentration and Debye screening effects. The resulting interchange growth rate of localized density perturbations is related to the cross-field propagation velocity and associated transport, which is reduced by an additional ion concentration compared to pure electron-positron plasmas. A simplified scaling relation is obtained from the exact analysis and compared with previous pure electron-positron plasma limits and empirical scalings based on simulation data.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"2 ","pages":"Article 100002"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772828522000036/pdfft?md5=3ec0f25988d7a6f190096b30cd3e55b4&pid=1-s2.0-S2772828522000036-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82230201","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":"Magnetic properties of twisted plasmons","authors":"J.T. Mendonça","doi":"10.1016/j.fpp.2022.07.001","DOIUrl":"10.1016/j.fpp.2022.07.001","url":null,"abstract":"<div><p>We consider the linear and nonlinear properties of twisted plasmons propagating in a magnetized plasma. Twisted plasmons are electron plasma waves with a finite amount of angular momentum. In contrast with plane plasma waves, which propagate along the static magnetic field direction with the same dispersion as in isotropic plasmas, the properties of twisted waves depend on the value of their angular momentum. A new dispersion relation is derived, using the fluid approximation. We also study nonlinear effects associated with twisted plasmons, and show that they introduce electromagnetic corrections. Of particular relevance is the excitation of a quasi-static magnetic field, which is associated with finite amplitude plasmon solutions.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"1 ","pages":"Pages 1-5"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772828522000012/pdfft?md5=24390ed2eab1383374ba885215e8a3c5&pid=1-s2.0-S2772828522000012-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74550491","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}
M. Aguilar-Benitez, Á. Morales, E. Fernández, F. Ynduráin
{"title":"25th International Winter Meeting on Fundamental Physics","authors":"M. Aguilar-Benitez, Á. Morales, E. Fernández, F. Ynduráin","doi":"10.1142/9789814528214","DOIUrl":"https://doi.org/10.1142/9789814528214","url":null,"abstract":"","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73448603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}