Linear and nonlinear modes in nonrelativistic electron-positron plasmas

Zank, G. P.; Greaves, R. G.

doi:10.1103/physreve.51.6079

Cited by 249 publications

(204 citation statements)

References 25 publications

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“…Waves in magnetized plasma are significantly different than those in unmagnetized plasma, with the exception of compressional (electrostatic) waves propagating parallel to the magnetic field. Many of the differences between pair plasmas and normal plasmas involve magnetized waves, including one that does not have an electron-ion plasma equivalent (Zank & Greaves 1995). In the high-frequency limit, this new wave propagates non-dispersively at the acoustic velocity, which in pair plasmas differs from the thermal velocity only by a factor of the adiabatic index γ , where γ = 1-3, depending on how far a process is from meeting the adiabatic criterion (Edwards et al 2016).…”

Section: Magnetizationmentioning

confidence: 99%

“…(Additional differences include there being no distinction between L and R waves, acoustic waves being heavily Landau damped, the absence of whistler waves and much more (Tsytovich & Wharton 1978;Stewart & Laing 1992;Iwamoto 1993;Zank & Greaves 1995).) Frequency cutoffs are a valuable diagnostic tool in plasma physics, due to their dependence on conditions that one wants to measure (e.g.…”

Section: Plasma Skin Depth and Plasma Frequencymentioning

confidence: 99%

“…Behaviour can go from linear to nonlinear, be dominated by a different aspect of the physics or disappear entirely. Hundreds of papers have been written on the topic, employing a variety of different theoretical treatments -relativistic and non-relativistic; kinetic and multi-fluid; linear and nonlinear (see, for example, Tsytovich & Wharton 1978;Stewart & Laing 1992;Iwamoto 1993;Berezhiani & Mahajan 1994;Blackman & Field 1994;Zank & Greaves 1995;Verheest & Lakhina 1996;Mahmood, Mushtaq & Saleem 2003;Bessho & Bhattacharjee 2005;Gary & Karimabadi 2009;Lopez et al 2012;Helander 2014;Liu et al 2015;Edwards, Fisch & Mikhailova 2016, just to name a small but diverse selection).…”

Section: Introductionmentioning

confidence: 99%

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Debye length and plasma skin depth: two length scales of interest in the creation and diagnosis of laboratory pair plasmas

et al. 2017

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In traditional electron/ion laboratory plasmas, the system size L is much larger than both the plasma skin depth l s and the Debye length λ D . In current and planned efforts to create electron/positron plasmas in the laboratory, this is not necessarily the case. A low-temperature, low-density system may have λ D < L < l s ; a high-density, thermally relativistic system may have l s < L < λ D . Here we consider the question of what plasma physics phenomena are accessible (and/or diagnostically exploitable) in these different regimes and how this depends on magnetization. While particularly relevant to ongoing pair plasma creation experiments, the transition from single-particle behaviour to collective, 'plasma' effects -and how the criterion for that threshold is different for different phenomena -is an important but often neglected topic in electron/ion systems as well.

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Section: Magnetizationmentioning

confidence: 99%

Section: Plasma Skin Depth and Plasma Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Debye length and plasma skin depth: two length scales of interest in the creation and diagnosis of laboratory pair plasmas

et al. 2017

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“…For example, Iwamoto [22] presented an elegant description of the linear modes in a nonrelativistic pair plasma that is magnetized. Zank and Greaves [23] then discussed the linear properties of various electrostatic and electromagnetic waves in unmagnetized and magnetized pair plasmas, in addition to discussing the two-stream instability and nonenvelope solitary wave solutions. It should be noted that the magneticfield-aligned circularly polarized electromagnetic (CPEM) waves and elliptically polarized extraordinary (EPEO) waves propagating across the external magnetic field direction have the same frequencies [24][25][26] in the cold e-p magnetoplasma.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic solitary pulses in a magnetized electron-positron plasma

2011

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A theory for large amplitude compressional electromagnetic solitary pulses in a magnetized electron-positron (e-p) plasma is presented. The pulses, which propagate perpendicular to the external magnetic field, are associated with the compression of the plasma density and the wave magnetic field. Here the solitary wave magnetic field pressure provides the restoring force, while the inertia comes from the equal mass electrons and positrons. The solitary pulses are formed due to a balance between the compressional wave dispersion arising from the curl of the inertial forces in Faradays law and the nonlinearities associated with the divergence of the electron and positron fluxes, the nonlinear Lorentz forces, the advection of the e-p fluids, and the nonlinear plasma current densities. The compressional solitary pulses can exist in a well-defined speed range above the Alfven speed. They can be associated with localized electromagnetic field excitations in magnetized laboratory and space plasmas composed of electrons and positrons.

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“…They are important in astrophysical environments, such as pulsar magnetospheres and active galactic nuclei. Plasmas of this type have been studied theoretically [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. We briefly discuss some motivations for laboratory studies:…”

Section: Electron-positron Plasmasmentioning

confidence: 99%

Practical limits on positron accumulation and the creation of electron-positron plasmas

Greaves¹,

Surko²

2002

AIP Conference Proceedings

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Abstract. The tasks of accumulating large numbers of positrons, creating high-density positron plastnas, and confining electron-positron plasmas present a number of technical challenges. Some practical considerations and limitations of common confinement schemes are discussed. A novel design for a multi-ccll Penning-Malmberg trap is proposed for the accumulation of large numbers of positrons (e.g., > 1012 and T -05 cV). A method is dcscribed to create a Ilow-density, electronpositron plasma (e.g., it "-107 cmt 3) for basic plasma physics studies that uses a cotnhinatiom of radio-frequency and magnetic confincment. The possibilities for confinement of a hot (cc.. T > 10 keV) electron-positron plasma in a magnetic mirror arc also discussed.

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Linear and nonlinear modes in nonrelativistic electron-positron plasmas

Cited by 249 publications

References 25 publications

Debye length and plasma skin depth: two length scales of interest in the creation and diagnosis of laboratory pair plasmas

Debye length and plasma skin depth: two length scales of interest in the creation and diagnosis of laboratory pair plasmas

Electromagnetic solitary pulses in a magnetized electron-positron plasma

Practical limits on positron accumulation and the creation of electron-positron plasmas

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