Ion acoustic solitary wave in homogeneous magnetized electron-positron-ion plasmas

Mahmood, S.; Ahmad, Masood; Saleem, H.

doi:10.1088/1367-2630/5/1/328

Cited by 176 publications

(90 citation statements)

References 15 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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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“…where ω, k x and k z are frequency and wave numbers along (13) gives the same dispersion relation as given in reference [16]. However, the limiting case of two component (e-i) plasma can be obtained from equation (13) by inserting n p0 = 0 (i.e., in the absence of positrons) and σ = 0 (i.e., for cold ions case), which gives,…”

Section: Nonlinear Set Of Equationsmentioning

confidence: 93%

“…The linear and nonlinear ion acoustic waves in unmagnetized [12][13][14] and magnetized [15,16] electron-positronion (e-p-i) plasmas have already been studied. Most of these studies have been done with the assumption of cold ions in such a multicomponent plasma.…”

Section: Introductionmentioning

confidence: 99%

Ion acoustic solitary waves with adiabatic ions in magnetized electron-positron-ion plasmas

Mahmood¹,

Akhtar

2008

Eur. Phys. J. D

102

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Abstract. Linear and nonlinear ion acoustic waves in the presence of adiabatically heated ions in magnetized electron-positron-ion plasmas are studied. The Sagdeev potential approach is employed to obtain the energy integral equation in such a mulitcomponent plasma using fluid theory. It is found that electron density humps are formed in the subsonic region in magnetized electron-positron-ion plasmas. The amplitude of electron density hump is decreased with the increase of hot ion temperature in electron-positron-ion plasmas. However, the increase in positron concentration and obliqueness of the wave increases the amplitude of nonlinear structure. The increase in positron concentration also reduces the width of the nonlinear structure in a magnetized multicomponent plasma. The numerical solutions in the form of solitary pulses are also presented for different plasma cases. The results may be applicable to astrophysical plasma situations, where magnetized electron-positron-ion plasma with hot ions can exist. PACS

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“…They have studied the linear and nonlinear wave propagation in e-p-i plasmas using different models. [14][15][16] Ion-acoustic (IA) wave is a very common and convenient wave that may form under the low-frequency perturbations in plasma medium. From several years ago, the nonlinear form of this wave was the topic of studies on plasma physics in the…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ion‐acoustic cnoidal wave in electron‐positron‐ion plasma with nonextensive electrons

Farhadkiyaei

Dorranian

2017

Contrib. Plasma Phys

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Effects of plasma nonextensivity on the nonlinear cnoidal ion-acoustic wave in unmagnetized electron-positron-ion plasma have been investigated theoretically. Plasma positrons are taken to be Maxwellian, while the nonextensivity distribution function was used to describe the plasma electrons. The known reductive perturbation method was employed to extract the KdV equation from the basic equations of the model. Sagdeev potential, as well as the cnoidal wave solution of the KdV equation, has been discussed in detail. We have shown that the ion-acoustic periodic (cnoidal) wave is formed only for values of the strength of nonextensivity (q). The q allowable range is shifted by changing the positron concentration (p) and the temperature ratio of electron to positron ( ). For all of the acceptable values of q, the cnoidal ion-acoustic wave is compressive. Results show that ion-acoustic wave is strongly influenced by the electron nonextensivity, the positron concentration, and the temperature ratio of electron to positron. In this work, we have investigated the effects of q, p, and on the characteristics of the ion-acoustic periodic (cnoidal) wave, such as the amplitude, wavelength, and frequency. KEYWORDScnoidal wave, electron-positron-ion plasma, ion-acoustic nonlinear wave, plasma nonextensivity, solitary wave INTRODUCTIONPlasma is mainly the science of universe, new accelerators, and new source of energy. Furthermore, there are many other applications of plasma that is penetrating into the technology of our ordinary life. [1,2] Plasma is a multimode medium. Depending on plasma species and condition, as well as plasma energy, a wide range of longitudinal or transverse modes in cnoidal or soliton form may generate in plasma medium. Some of them may be observed in linear regime, but there are a large number of plasma modes that will appear after taking the nonlinearity into account. Because of its high energy, the nonlinear phenomena play an essential role in plasma medium.Normal plasmas comprise of electrons, ions, and neutral particles. In the case of high-energy plasma, positrons will be produced in the medium due to pair production phenomena. The electron-positron-ion (e-p-i) plasma has an important role in the understanding of the plasmas in the early universe, [3,4] in active galactic nuclei, [5] in pulsar magnetospheres, [6,7] and in the solar atmosphere.[8] It is well known that when positrons are introduced into e-i plasma, the response of the plasma changes significantly. The presence of positrons has some application in plasma. For instance, they can be used to probe particle transport in tokamaks, and since they have sufficient lifetime, the two-component (e-i) plasma becomes three-component (e-p-i) plasma. [9][10][11][12][13] Most of the astrophysical plasmas also contain positrons in addition to electrons and ions. During the last decade, e-p-i plasma has attracted the attention of several authors. They have studied the linear and nonlinear wave propagation in e-p-i plasmas using different models. [14][1...

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Ion acoustic solitary wave in homogeneous magnetized electron-positron-ion plasmas

Cited by 176 publications

References 15 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

Ion acoustic solitary waves with adiabatic ions in magnetized electron-positron-ion plasmas

Nonlinear ion‐acoustic cnoidal wave in electron‐positron‐ion plasma with nonextensive electrons

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