Acoustic double layer structures in dense magnetized electron-positron-ion plasmas

Akhtar, Naseem; Mahmood, S.

doi:10.1063/1.3655438

Cited by 9 publications

(7 citation statements)

References 39 publications

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“…It was pointed out that the ion concentration and the quantum diffraction effects of electrons and positrons significantly affect the depth and steepness of the DL structures. [15][16][17] However, in all these investigations of quantum plasma, only Bohm potential effects were taken into account.…”

Section: Introductionmentioning

confidence: 99%

On the formation of spin dependent double layer structure in astrophysical plasmas

Khanum

Iqbal

Shamir

et al. 2021

Contributions to Plasma Physics

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Double layers (DLs) are nonlinear structures, and are thought to be responsible for particle acceleration in laboratory plasmas and astrophysical plasmas. In this paper, the existence of spin dependent DLs structure is explored using separate spin evolution quantum hydrodynamic model. Based on reductive perturbation method, we derived an extended Korteweg-de Vries (eKdV) equation to demonstrate the existence and nature of DLs. We found that spin polarization significantly enhanced the amplitude of the electrostatic potential associated with DLs.Further, spin polarization also increases the depth and width of the Sagdeev potential. It is noted that the contribution of Bohm potential effect is essential for the formation of DLs structure. Our results may be helpful to explain the phenomenon of particle acceleration in dense astrophysical environments specifically in a white dwarf.

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Section: Introductionmentioning

confidence: 99%

On the formation of spin dependent double layer structure in astrophysical plasmas

Khanum

Iqbal

Shamir

et al. 2021

Contributions to Plasma Physics

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“…[27] The quantum acoustic double layer structure can exist in dense magnetized EPI plasmas, of which the steepness will increase as the magnetic field strength increases. [28] The magnetosonic waves in magnetized degenerate EPI plasmas with spin effects were studied by considering the combined effects of quantum diffraction and spin magnetization energy, which shows that the effect of quantum corrections significantly modifies the dispersive properties of magnetosonic waves. [29] The quantum freak waves in white dwarfs and magnetars can be investigated in ultrarelativistic degenerate EPI plasmas.…”

Section: Introductionmentioning

confidence: 99%

Relativistic degenerate effects of electrons and positrons on modulational instability of quantum ion acoustic waves in dense plasmas with two polarity ions

Liu¹,

Wang²,

Yan-Zhen³

2015

Chinese Phys. B

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The nonlinear propagation of quantum ion acoustic wave (QIAW) is investigated in a four-component plasma composed of warm classical positive ions and negative ions, as well as inertialess relativistically degenerate electrons and positrons. A nonlinear Schrödinger equation is derived by using the reductive perturbation method, which governs the dynamics of QIAW packets. The modulation instability analysis of QIAWs is considered based on the typical parameters of the white dwarf. The results exhibit that both in the weakly relativistic limit and in the ultrarelativistic limit, the modulational instability regions are sensitively dependent on the ratios of temperature and number density of negative ions to those of positive ions respectively, and on the relativistically degenerate effect as well.

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“…Therefore, double layers may be useful to explain the acceleration or deceleration of a charged particle in cosmic plasma. It has been suggested that double layers are responsible for accelerating particles in the auroral region of the ionosphere (Alfvén 1958;Fowler and Logan 1977). Double layers find practical application for ion heating in linear turbulent devices (Baldwin and Logan 1979) and in open-ended fusion machines such as tandem mirrors (Alfvén 1958;Baldwin and Logan 1979).…”

Section: Introductionmentioning

confidence: 99%

“…It has been suggested that double layers are responsible for accelerating particles in the auroral region of the ionosphere (Alfvén 1958;Fowler and Logan 1977). Double layers find practical application for ion heating in linear turbulent devices (Baldwin and Logan 1979) and in open-ended fusion machines such as tandem mirrors (Alfvén 1958;Baldwin and Logan 1979). The theory of double layers may also be used to explain the mechanism of solar flares (Alfvén and Carlqvist 1967), ion conics (Borovsky and Joyce 1983), and in modeling of astrophysical processes.…”

Section: Introductionmentioning

confidence: 99%

“…A large number of theoretical (Block 1978;Buti 1980;Nishihara and Tajiri 1981;Goswami and Bujarbarua 1985;Bharuthram and Shukla 1986;Yadav and Sharma 1991;Mishra et al 2007;Lakhina et al 2008;Sabry 2009;Chatterjee et al 2010;Akhtar and Mahmood 2011) and experimental (Oleson and Found 1949;Jones et al 1975;Nishida and Nagasawa 1986;Hairapetian and stenzel 1991;Ahedo and Sanchez 2008) investigations have been carried out on double layers in addition to numerical simulations (Singh 1982;Goertz and Borovsky 1983) in various plasma systems. Hairapetian and stenzel (1991) in their experimental observation of a current free double layer have considered two species of electrons having temperatures of ∼4 and ∼80 eV with ions of temperature ∼0.5 eV.…”

Section: Introductionmentioning

confidence: 99%

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Ion-acoustic double layers in electron–positron–ion plasmas with finite ion temperature

Jain¹,

Mishra²

2013

J. Plasma Phys.

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The large-amplitude ion-acoustic double layers in a collisionless plasma consisting of isothermal positrons, warm adiabatic ions and two-temperature distribution of electrons are investigated. Using the pseudo-potential approach, an energyintegral equation for the system has been derived which encompasses complete nonlinearity for the plasma system. The existence region of the double layers is analyzed numerically. It is found that for a selected set of physical parameters, the rarefactive double layer exists in the electron-positron-ion plasma. It is found that the existence regime of the double layer is very sensitive to the plasma parameters, e.g. cold electron concentration (μ) and temperature ratio of two electron species (β). An increase in the finite ion temperature ratio increases the amplitude of the rarefactive double layer. To study small-amplitude double layers, we have expanded the Sagdeev potential. In the case of small amplitude, it is found that the amplitude of the double layer increases with increase in ion temperature ratio (σ) and cold electron concentration (μ). However increase in positron concentration (α) and temperature ratio of positrons to electrons (γ) decreases the amplitude of the double layer. The effect of various plasma parameters on the characteristics of the double layers is discussed in detail. The results of the investigation may be helpful to understanding basic plasma characteristics in space.

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Acoustic double layer structures in dense magnetized electron-positron-ion plasmas

Cited by 9 publications

References 39 publications

On the formation of spin dependent double layer structure in astrophysical plasmas

On the formation of spin dependent double layer structure in astrophysical plasmas

Relativistic degenerate effects of electrons and positrons on modulational instability of quantum ion acoustic waves in dense plasmas with two polarity ions

Ion-acoustic double layers in electron–positron–ion plasmas with finite ion temperature

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