Excitation of ion acoustic solitons from grids

Abstract

Using a particle-in-cell code, we are able to simulate the excitation of ion acoustic solitons from a grid whose potential is suddenly increased. The numerical results are in substantial agreement with previous laboratory experiments.

Atypical gravito-electrostatic fluctuations in the presence of active ion-inertial dynamics

“… The phase portraits of both the Coulombic and Newtonian dynamics reveal a conservative dissipation-free nature of the fluctuations. The scale-invariant fluctuation signatures, apart from their conformity with the earlier theoretical findings as already evident in the text, are in good correspondence with the experimentally detected solitary waves in collision-dominated plasmas, (Barkan, Merlino & D’Angelo 1995; Verheest 1996; El-Zein et al. 1999; Merlino et al. 2012).…”

“…Haloi and P. K. Karmakar (8) The phase portraits of both the Coulombic and Newtonian dynamics reveal a conservative dissipation-free nature of the fluctuations. (9) The scale-invariant fluctuation signatures, apart from their conformity with the earlier theoretical findings as already evident in the text, are in good correspondence with the experimentally detected solitary waves in collisiondominated plasmas, (Barkan, Merlino & D'Angelo 1995;Verheest 1996;El-Zein et al 1999;Merlino et al 2012). (10) Lastly, the fluctuations presented here exist in a number of well-explored space clouds, which have been testified to by various spacecraft instrumentations and on-board multiple space-satellite-centric observations such as Freja, Viking, FAST, etc.…”

Nonlinear waves in a self-gravitating charge-varying collisional dust molecular cloud in presence of diverse equilibrium inhomogeneities

“…The fluctuation structures in the astrophysical charge-varying collisional grainy plasma appear mainly in the unique form of oscillatory shocks and solitary spectral patterns [7,[10][11][12][13][14][15][16][17][18][19][20][21]27], which are subsequently shown to undergo some newer transitions in between the two distinct classes of the spectral patterns in a realistic parameter regime. Lastly, we discuss the main significance of such eigenmode structures lying in the diverse areas of cloud physics, space science and modern astrophysics because of their crucial role in understanding self-gravitational collapse, formation and evolution of interstellar structures, star formation, galactic composition and its evolution, etc, as widely explained elsewhere too [16,17,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44].…”

Ion-acoustic solitary waves in ion-beam plasma with Boltzmann electrons

“…Since Ikezi et al 1 observed an ionacoustic solitary wave in a double plasma machine, several authors have studied ion-acoustic solitary waves in laboratory experiments 2-9 as well as in particle-in-cell (PIC) simulations. [10][11][12][13][14] For instance, Nagasawa and Nishida 6 carried out experimental observations on the nonlinear reflection and refraction of a planar ion-acoustic solitary wave in a double plasma device. Lee et al 7 found a chain of solitary waves in a double plasma device, the characteristics of which agree well with the solution of the KdV equation for ion-beam plasma systems.…”

“…Other investigations have focused on exciting ion-acoustic solitary waves, either by modulating the grid near the ion plasma frequency 11 or by sharply increasing the grid potential. 12 Sheridan et al 11 investigated how a large perturbation could evolve into a solitary wave and discovered that a large amplitude ion-acoustic wave decays into an ion-acoustic solitary wave and an ionacoustic wave. Nakamura et al 13 studied solitary waves in a double plasma device with negative ions and found rarefactive solitary waves.…”