arXiv: Plasma Physics最新文献_第2页

On the upper limit of laser intensity attainable in nonideal vacuum 非理想真空中可达到的激光强度上限

arXiv: Plasma Physics Pub Date : 2020-11-30 DOI: 10.1364/PRJ.416555

Yitong Wu, L. Ji, Ruxin Li

引用次数: 3

Resonant electron–plasmon interactions in drifting electron gas 飘移电子气体中共振电子-等离子体相互作用

arXiv: Plasma Physics Pub Date : 2020-11-30 DOI: 10.1063/5.0039067

M. Akbari-Moghanjoughi

{"title":"Resonant electron–plasmon interactions in drifting electron gas","authors":"M. Akbari-Moghanjoughi","doi":"10.1063/5.0039067","DOIUrl":"https://doi.org/10.1063/5.0039067","url":null,"abstract":"In this paper we investigate the resonant electron-plasmon interactions in a drifting electron gas of arbitrary degeneracy. The kinetic corrected quantum hydrodyanmic model is transformed into the effective Schr\"{o}dinger-Poisson model and driven coupled pseudoforce system is obtained via the separation of variables from the appropriately linearized system. It is remarked that in the low phase-speed kinetic regime the characteristic particle-like plasmon branch is profoundly affected by this correction which is a function of the electron number density and temperature. We also present an alternative explanation of the quantum wave-particle duality as a direct consequence of resonant electron-plasmon interaction (electron murmuration). In this picture drifting electrons are resonantly scattered by spatial electrostatic energy distribution, characterizing them by the de Broglie's oscillations. The phase-shift and amplitude of excitations in damped driven pseudoforce system is derived and their variations in terms of normalized chemical potential and electron temperature is studied. In particular we investigate the kinetic correction effect on energy dispersion relation in the electron gas in detail. It is revealed that only the low phase-speed branch of the dispersion curve is significantly affected by the kinetic correction. It is also found that increase in the electron number density leads to increase in effective mass and consequently decrease in electron mobility while the increase in the electron temperature has the converse effect. The kinetic correction also significantly lowers the plasmon conduction band. Current model may be further elaborated to investigate the beam-plasmon interaction and energy exchange in multispecies quantum plasmas.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76805439","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: 4

Inflationary stimulated Raman scattering in shock-ignition plasmas 激波点火等离子体中膨胀激发的拉曼散射

arXiv: Plasma Physics Pub Date : 2020-11-24 DOI: 10.1063/5.0022901

S. Spencer, A. Seaton, T. Goffrey, T. Arber

引用次数: 6

Diffusion regime of electron–electron collisions in weakly ionized plasmas 弱电离等离子体中电子-电子碰撞的扩散机制

arXiv: Plasma Physics Pub Date : 2020-11-23 DOI: 10.1063/5.0038623

B. Breizman, G. Stupakov, G. Vekstein

引用次数: 2

Guiding center and gyrokinetic orbit theory for large electric field gradients and strong shear flows 大电场梯度和强剪切流的导向中心和陀螺动力学轨道理论

arXiv: Plasma Physics Pub Date : 2020-11-17 DOI: 10.1063/5.0037889

I. Joseph

{"title":"Guiding center and gyrokinetic orbit theory for large electric field gradients and strong shear flows","authors":"I. Joseph","doi":"10.1063/5.0037889","DOIUrl":"https://doi.org/10.1063/5.0037889","url":null,"abstract":"The guiding center and gyrokinetic theory of magnetized particle motion is extended to the regime of large electric field gradients perpendicular to the magnetic field. A gradient in the electric field directly modifies the oscillation frequency and causes the Larmor orbits to deform from circular to elliptical trajectories. In order to retain a good adiabatic invariant, there can only be strong dependence on a single coordinate at lowest order, so that resonances do not generate chaotic motion that destroys the invariant. When the gradient across magnetic flux surfaces is dominant, the guiding center drift velocity becomes anisotropic in response to external forces and additional curvature drifts must be included. The electric polarization density remains gyrotropic, but both the polarization and magnetization are modified by the change in gyrofrequency. The theory can be applied to strong shear flows, such as are commonly observed in the edge transport barrier of a high-performance tokamak (H-mode) pedestal, even if the toroidal/guide field is small. Yet, the theory retains a mathematical form that is similar to the standard case and can readily be implemented within existing simulation tools.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83511020","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: 4

A two-fluid analysis of waves in a warm ion–electron plasma 热离子-电子等离子体中波的双流体分析

arXiv: Plasma Physics Pub Date : 2020-11-12 DOI: 10.1063/5.0029534

Jordi De Jonghe, Rony Keppens

{"title":"A two-fluid analysis of waves in a warm ion–electron plasma","authors":"Jordi De Jonghe, Rony Keppens","doi":"10.1063/5.0029534","DOIUrl":"https://doi.org/10.1063/5.0029534","url":null,"abstract":"Following recent work, we discuss waves in a warm ideal two-fluid plasma consisting of electrons and ions starting from a completely general, ideal two-fluid dispersion relation. The plasma is characterised by five variables: the electron and ion magnetisations, the squared electron and ion sound speeds, and a parameter describing the angle between the propagation vector and the magnetic field. The dispersion relation describes 6 pairs of waves which we label S, A, F, M, O, and X. Varying the angle, it is argued that parallel and perpendicular propagation (with respect to the magnetic field) exhibit unique behaviour. This behaviour is characterised by the crossing of wave modes which is prohibited at oblique angles. We identify up to 6 different parameter regimes where a varying number of exact mode crossings in the special parallel or perpendicular orientations can occur. We point out how any ion-electron plasma has a critical magnetisation (or electron cyclotron frequency) at which the cutoff ordering changes, leading to different crossing behaviour. These are relevant for exotic plasma conditions found in pulsar and magnetar environments. Our discussion is fully consistent with ideal relativistic MHD and contains light waves. Additionally, exploiting the general nature of the dispersion relation, phase and group speed diagrams can be computed at arbitrary wavelengths for any parameter regime. Finally, we recover earlier approximate dispersion relations that focus on low-frequency limits and make direct correspondences with some selected kinetic theory results.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74232758","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: 9

Stationary states of polytropic plasmas 多向等离子体的稳态

arXiv: Plasma Physics Pub Date : 2020-11-11 DOI: 10.1063/5.0024222

R. Guo

引用次数: 3

ITER cold VDEs in the limit of perfectly conducting walls ITER在完全导电壁的极限下冷却vde

arXiv: Plasma Physics Pub Date : 2020-11-11 DOI: 10.1063/5.0037464

C. Clauser, S. Jardin

{"title":"ITER cold VDEs in the limit of perfectly conducting walls","authors":"C. Clauser, S. Jardin","doi":"10.1063/5.0037464","DOIUrl":"https://doi.org/10.1063/5.0037464","url":null,"abstract":"Recently, it has been shown that a vertical displacement event (VDE) can occur in ITER even when the walls are perfect conductors, as a consequence of the current quench [A. H. Boozer, Physics of Plasmas 26 114501 (2019)]. We used the extended-MHD code M3D-C1 with an ITER-like equilibrium and induced a current quench to explore cold VDEs in the limit of perfectly conducting walls, using different wall geometries. In the particular case of a rectangular wall with the side walls far away from the plasma, we obtained very good agreement with the analytical model developed by Boozer that considers a top/bottom flat-plates wall. We show that the solution in which the plasma stays at the initial equilibrium position is improved when bringing the side walls closer to the plasma. When using the ITER first wall in the limit of a perfect conductor, the plasma stays stable at the initial equilibrium position far beyond the value predicted by the flat-plates wall limit. On the other hand, when considering the limit in which the inner shell of the ITER vacuum vessel is acting as a perfect conductor, the plasma is displaced during the current quench but the edge safety factor stays above $2$ longer in the current decay compared to the flat-plates wall limit. In all the simulated cases, the vertical displacement is found to be strongly dependent on the plasma current, in agreement with a similar finding in the flat-plates wall limit, showing an important difference with usual VDEs in which the current quench is not a necessary condition.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76573005","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: 4

Turbulent transport of fast ions in tokamak plasmas in the presence of resonant magnetic perturbations 共振磁扰动下托卡马克等离子体中快离子的湍流输运

arXiv: Plasma Physics Pub Date : 2020-11-04 DOI: 10.1063/5.0035541

D. Palade

引用次数: 3

Electron Acceleration during Macroscale Non-Relativistic Magnetic Reconnection 宏观尺度非相对论性磁重联中的电子加速

arXiv: Plasma Physics Pub Date : 2020-11-02 DOI: 10.13016/ZC8D-FUMF

H. Arnold, J. Drake, M. Swisdak, F. Guo, J. Dahlin, Bin Chen, G. Fleishman, L. Glesener, E. Kontar, T. Phan, Chengcai Shen

引用次数: 1