Collisionless Damping of Geodesic Acoustic Mode in a Multi‐Ion Plasma with Superthermal Ions

Ni, Gengsong; Liu, Y.; Liu, S. Q.

doi:10.1002/ctpp.201500036

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…The effects of Z eff in multi-ion species plasmas have also been investigated using linear GK equations and non-Maxwellian ion energy distributions [445]. Both the GAM frequency (linearly) and the damping rate (nonlinearly) were found to fall with increasing Z eff = j=b,i q 2 j n j / j=b,i q j n j , where b, i refer to bulk and impurity ion respectively, and the degree of non-Maxwellian-ness of the ion distribution function (e.g.…”

Section: Impurities and Effective Charge Z Effmentioning

confidence: 99%

Geodesic acoustic modes in magnetic confinement devices

Smolyakov

Ido

2021

Nucl. Fusion

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Geodesic acoustic modes (GAMs) are ubiquitous oscillatory flow phenomena observed in toroidal magnetic confinement fusion plasmas, such as tokamaks and stellarators. They are recognized as the non-stationary branch of the turbulence driven zonal flows which play a critical regulatory role in cross-field turbulent transport. GAMs are supported by the plasma compressibility due to magnetic geodesic curvature—an intrinsic feature of any toroidal confinement device. GAMs impact the plasma confinement via velocity shearing of turbulent eddies, modulation of transport, and by providing additional routes for energy dissipation. GAMs can also be driven by energetic particles (so-called EGAMs) or even pumped by a variety of other mechanisms, both internal and external to the plasma, opening-up possibilities for plasma diagnosis and turbulence control. In recent years there have been major advances in all areas of GAM research: measurements, theory, and numerical simulations. This review assesses the status of these developments and the progress made towards a unified understanding of the GAM behaviour and its role in plasma confinement. The review begins with tutorial-like reviews of the basic concepts and theory, followed by a series of topic orientated sections covering different aspects of the GAM. The approach adopted here is to present and contrast experimental observations alongside the predictions from theory and numerical simulations. The review concludes with a comprehensive summary of the field, highlighting outstanding issues and prospects for future developments.

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Section: Impurities and Effective Charge Z Effmentioning

confidence: 99%

Geodesic acoustic modes in magnetic confinement devices

Smolyakov

Ido

2021

Nucl. Fusion

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“…It is important to note that the distribution function with q < 1, compared with the Maxwellian limits, there are more particles with the velocities faster than the thermal speed, which is called the super‐extensive case, whereas the distribution function with q > 1 depicts a large number of low‐speed particles, which is called the sub‐extensive case. This q ‐non‐extensive distribution has been successfully employed in plasma physics, such as plasma oscillations in a collisionless thermal plasma, the thermal dispersion relation in a collisionless plasmas, dust‐charging processes, dust ion acoustic waves or dust acoustic waves in a dusty plasma by taking non‐extensive electrons, non‐extensive ions, or both to be non‐extensive, and ion and positron acoustic solitons in magnetized dusty plasma . Recently, a great deal of attention has been paid to the Bohm criterion and the sheath structure in plasma with non‐extensively distributed electrons .…”

Section: Introductionmentioning

confidence: 99%

Effects of non‐extensive electrons on the sheath of dusty plasmas with variable dust charge

Ghani

Driouch

Chatei

2019

Contributions to Plasma Physics

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In this study, a detailed investigation of the problem of sheath is presented using the fluid model in a magnetized three‐component dusty plasma system comprising positive ions, dust grains with variable charge and q‐non‐extensive electrons (i.e., the electrons evolve far away from their Maxwellian thermodynamic equilibrium [q = 1]). The effects of q‐non‐extensivity parameter on the plasma sheath parameters are studied numerically. A significant change is observed in the quantities characterizing the sheath with the presence of the super‐extensive electrons (q < 1) and sub‐extensive electrons (q > 1). In addition, based on the orbital motion limited theory, by taking various forces acting on the dust particle into consideration, the dynamics of the dust located within the sheath, that is, the dust grain charging inside the sheath, is examined under different values of q. It is found that the q‐non‐extensivity has affected significantly the dynamics and the charging process of the dust grains in the sheath.

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“…In particular, with the development of nonextensive statistics, when it is recognized that this new statistical theory can be used as a theoretical basis for the study of power-law distributed plasmas, the investigations of q-distributed plasmas are becoming increasingly widespread across both astrophysics and space science with an exponential growth rate of relevant publications (see the list of publications on plasma physics in Ref. [3]), which include a wide variety of waves and instabilities both in different electron-ion plasmas and dusty plasmas, solar wind and properties of other plasmas etc [20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

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confidence: 99%

Slowing down of charged particles in dusty plasmas with power‐law kappa‐distributions

Guo

Liu

et al. 2018

Contributions to Plasma Physics

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We study the slowing down of a particle beam passing through the dusty plasma with power-law -distributions. Three plasma components, electrons, ions, and dust particles, can have a different -parameter. By using Fokker-Planck theory, the deceleration factor and slowing down time are derived and expressed by a hyper-geometric -function. Numerically, we study the slowing down property of an electron beam in the -distributed dusty plasma. We show that the slowing down in the plasma depends strongly on the -parameters of plasma components, and dust particles play a dominant role in the deceleration effects. We also show dependence of the slowing down on mass and charge of a dust particle in the kappa-distributed plasma.

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Collisionless Damping of Geodesic Acoustic Mode in a Multi‐Ion Plasma with Superthermal Ions

Cited by 5 publications

References 36 publications

Geodesic acoustic modes in magnetic confinement devices

Geodesic acoustic modes in magnetic confinement devices

Effects of non‐extensive electrons on the sheath of dusty plasmas with variable dust charge

Slowing down of charged particles in dusty plasmas with power‐law kappa‐distributions

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