Fundamental Plasma Physics最新文献_第6页

Vertical displacements close to ideal-MHD marginal stability in tokamak plasmas 托卡马克等离子体中接近理想MHD边缘稳定性的垂直位移

Fundamental Plasma Physics Pub Date : 2023-06-01 DOI: 10.1016/j.fpp.2023.100017

F. Porcelli , T. Barberis , A. Yolbarsop

引用次数: 0

A Hamiltonian and geometric formulation of general Vlasov-Maxwell-type models 一般Vlasov-Maxwell型模型的哈密顿量和几何公式

Fundamental Plasma Physics Pub Date : 2023-06-01 DOI: 10.1016/j.fpp.2023.100016

William Barham , Philip J. Morrison , Eric Sonnendrücker

引用次数: 0

Formation and Ejection of Helical Plasma Structures from Gravitational Wave Emitters 引力波发射器螺旋等离子体结构的形成和喷射

Fundamental Plasma Physics Pub Date : 2023-04-01 DOI: 10.1016/j.fpp.2022.100007

B. Coppi

{"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}

引用次数: 1

Observation of poloidal magnetic flux emission from the post-pinch phase of a plasma focus and its significance for laboratory simulation of astrophysical jets 等离子体焦点后箍缩阶段极向磁通发射的观测及其对天体物理喷流实验室模拟的意义

Fundamental Plasma Physics Pub Date : 2023-04-01 DOI: 10.1016/j.fpp.2023.100012

S.K.H. Auluck , A.B. Blagoev

{"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}

引用次数: 1

Exact expression for the hot plasma conductivity kernel in configuration space 组态空间中热等离子体电导率核的精确表达式

Fundamental Plasma Physics Pub Date : 2023-02-01 DOI: 10.1016/j.fpp.2023.100008

Mike Machielsen , Joey Rubin , Jonathan Graves

引用次数: 0

Map of suprathermal onto nonextensive parameters describing Langmuir waves 描述Langmuir波的超热到非扩展参数的映射

Fundamental Plasma Physics Pub Date : 2023-02-01 DOI: 10.1016/j.fpp.2022.100006

F.E.M. Silveira , M.H. Benetti

引用次数: 1

Scaling law for interchange transport in magnetically confined electron-positron plasmas with ion impurity 含离子杂质的磁约束电子-正电子等离子体中交换输运的标度律

Fundamental Plasma Physics Pub Date : 2022-06-01 DOI: 10.1016/j.fpp.2022.09.001

M. Kühbauch, A. Kendl