Kinetic theory of the anomalous transport of superthermal electrons in toroidal devices

Gurevich, A. V.; Lukyanov, A.; Zybin, K. P.

doi:10.1088/0029-5515/35/7/i06

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Recently, the effect of turbulence on the suprathermal electron distribution has been analysed in Ref. [25] using a special diffusion operator in configuration and velocity space. Moreover, attention has been drawn recently to the fact that collisionless diffusion of particles across the magnetic field can take place when particles are accelerated along the magnetic field lines [26, 271.…”

Section: Discussionmentioning

confidence: 99%

Modelling of lower hybrid current drive in the presence of spatial radial diffusion

Shkarofsky

Shoucri

1997

Nucl. Fusion

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A code to solve the full three dimensional Fokker-Planck kinetic equation in the presence of lower hybrid current drive (LHCD) is applied to study numerically the problem of modelling LHCD, including the combined effects of spatial radial diffusion and an electric field. The code uses the Beliaev-Budker relativistic collision operator, and applies a method of fractional steps to the numerical solution of the time evolution equation for the three dimensional Fokker-Planck equation. The importance of the numerical approach associated with an exact relativistic treatment for the solution is emphasized in order to study accurately all the physics associated with this problem, especially the shape of the distribution function and the physics associated with its hot tail as, for instance, the fast electron transport and lower hybrid absorbed power profiles. The aim of the simulation is to match hard X ray imaging profiles and current density profiles. An accurate relativistic treatment of the hot tail helps make the study of these problems less phenomenological and more physical. Some preliminary results from the Tokamak de Varennes (TdeV) are analysed in order to illustrate the power of the method

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Section: Discussionmentioning

confidence: 99%

Modelling of lower hybrid current drive in the presence of spatial radial diffusion

Shkarofsky

Shoucri

1997

Nucl. Fusion

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“…Notably, high energy particles exist due to the effect of external forces acting on the space environment plasmas. Gurevich et al [19] investigated the behaviour of fast or superthermal electrons by deriving the kinetic equation and demonstrated the strong influence of the density profile on the diffusion of fast particles. Lu et al [20] studied the presence of superthermal electrons in the space plasma and observed the variation of indices of the power law distribution in the magnetosheath.…”

Section: Introductionmentioning

confidence: 99%

Solitary waves and double layers in an adiabatic multi-component space plasma

Shah¹,

Rahman²,

Hossen³

et al. 2017

Preprint

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The formation and propagation of small amplitude Heavy-ion-acoustic (HIA) solitary waves and double layers in an unmagnetized collisionless multi-component plasma system consisting of superthermal electrons, Boltzmann distributed light ions, and adiabatic positively charged inertial heavy ions are theoretically investigated. The reductive perturbation technique is employed to derive the modified Korteweg-de Vries (mK-dV) and standard Gardner (SG) equations. The solitary wave (SW) solution of mK-dV and SG equations as well as Double Layers (DLs) solution of SG equation is studied for analysis of higher-order nonlinearity. It is found that the plasma system under consideration supports positive and negative potential Gardner solitons but only positive potential mK-dV solitons. In addition, it is shown that, the basic properties of HIA mK-dV and Gardner solitons and DLs (viz. polarity, amplitude, width, and phase speed) are incomparably influenced by the adiabaticity effect of heavy ions and the superthermality effect of electrons. The relevance of the present findings to the system of space plasmas as well as to the system of researchers interest is specified.

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Relativistic and Heavy Ion Effects on Single‐ and Multi‐Soliton Structures of Ion‐Acoustic Waves

Bhuyan,

Imon,

Alam

2024

Contrib. Plasma Phys

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The fundamental characteristics of ion‐acoustic waves (IAWs) due to the relativistic effects are investigated in a collisionless unmagnetized plasma system consisting of relativistic positively charged inertial heavy ions, kappa‐distributed electrons, and Maxwellian light ions. The reductive perturbation method (RPM) is used to derive the nonlinear evolution equation like the Korteweg‐de Vries (KdV) equation. The production of single‐, double‐, and triple‐IAW solitons (IAWSs) is also investigated. It is found that for the effects of concerned parameters only rarefactive (IAWSs) are produced. The results obtained in this study are useful not only to understand the space plasma phenomena such as plasma sheet boundary layer of earth's magnetosphere, laser‐plasma interaction, but also to validate the laboratory experiments.

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Kinetic theory of the anomalous transport of superthermal electrons in toroidal devices

Cited by 6 publications

References 29 publications

Modelling of lower hybrid current drive in the presence of spatial radial diffusion

Modelling of lower hybrid current drive in the presence of spatial radial diffusion

Solitary waves and double layers in an adiabatic multi-component space plasma

Relativistic and Heavy Ion Effects on Single‐ and Multi‐Soliton Structures of Ion‐Acoustic Waves

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