Turbulent pinch in whole-plasma simulations of a dipole-confined plasma

Ou, Weike; Wang, L. P.; Li, Bo; Rogers, B. N.

doi:10.1103/physreve.101.021201

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…In certain magnetic configurations (e.g., Z-pinch 3 and dipole 4 ), it is believed to play an essential role in particle and heat transport when ideal MHD instabilities are suppressed. For instance, it is found that the entropy mode is responsible for the observed particle pinch (i.e., transport of particles along the direction of the density gradient) in the dipole configuration with both local gyrokinetic 5 and global fluid 6 simulations. The universal mode (instability) was first named to refer to the electrostatic instability predicted in low β magnetized plasma occurring due to non-uniform densities -a pervasive characteristic amongst almost all magnetized plasmas, and hence the term universal.…”

Section: Introductionmentioning

confidence: 99%

Generalized slab universal instability and its appearance in pair plasma

Zhu,

Francisquez,

Rogers

et al. 2020

Preprint

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A generalized linear dispersion relation of electromagnetic slab universal modes is derived, taking into account arbitrary ion charge state, electron finite Larmor radius (FLR) effects, and Debye shielding effects. As a consequence, it provides more accurate predictions and is applicable to a wider range of plasmas. We find that electron FLR effects have a weakly stabilizing effect on the slab universal instability in electron-ion plasma, while Debye shielding strongly stabilizes this instability when λ D approaches ρ i (λ D is the Debye length and ρ i is the ion gyro-radius). In particular, we examine the stability criterion for this instability in electron-positron pair plasmas, and find that the instability persists in this simplest plasma system as long as the pair plasma number density exceeds the critical value n c = B 2 /(8πm e c 2 ).

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Section: Introductionmentioning

confidence: 99%

Generalized slab universal instability and its appearance in pair plasma

Zhu,

Francisquez,

Rogers

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

Generalized slab universal instability and its appearance in pair plasma

et al. 2020

View full text Add to dashboard Cite

A generalized linear dispersion relation of electromagnetic slab universal modes is derived, taking into account arbitrary ion charge state, electron finite Larmor radius (FLR) effects, and Debye shielding effects. As a consequence, it provides more accurate predictions and is applicable to a wider range of plasmas. We find that electron FLR effects have a weakly stabilizing effect on the slab universal instability in electron–ion plasma, while Debye shielding strongly stabilizes this instability when λD approaches ρi (λD is the Debye length and ρi is the ion gyroradius). In particular, we examine the stability criterion for this instability in electron–positron pair plasmas and find that the instability persists in this simplest plasma system as long as the pair plasma number density exceeds the critical value nc=B2/(8πmec2).

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Self-organized confinement in whole-device modeling of laboratory magnetospheres

Wang

et al. 2021

Physics of Plasmas

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Turbulent self-organization driven by global ideal interchange modes in a dipole-confined plasma is explored with self-consistent, whole-plasma simulations using a flux-tube averaged magnetohydrodynamic model in dipole magnetic geometry. We show the existence of robust particle pinch driven by ideal interchange-mode fluctuations, in which the particles are transported up the density gradient. It is found that the plasma profiles in a dipole field spontaneously relax to a marginally stable state as centrally peaked pressure and density are created by global interchange-mode transport.

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Turbulent pinch in whole-plasma simulations of a dipole-confined plasma

Cited by 5 publications

References 24 publications

Generalized slab universal instability and its appearance in pair plasma

Generalized slab universal instability and its appearance in pair plasma

Generalized slab universal instability and its appearance in pair plasma

Self-organized confinement in whole-device modeling of laboratory magnetospheres

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