Obliquely Propagating Non-Monotonic Double Layer in a Hot Magnetized Plasma

et al. 2007

J. Plasma Phys.

The analytic solution for the time stationary non-monotonic double layers in multi-species plasma is presented. This solution is the analytic extension of the monotonic double layer and the solitary hole. We have derived the modified Korteweg-de Vries equation in plasmas, taking account of negative ion effects. The effects of negative ion and density on the properties of the non-monotonic double layer are discussed.

Modified Korteweg–de Vries theory of non-monotonic double layers in multi-species plasma

Kim¹,

et al. 2007

J. Plasma Phys.

Arbitrary amplitude dust-acoustic double-layers in an electron-depleted dusty plasma with two high-energy tail ion distributions

Mayout¹,

Tribeche²

2012

J. Plasma Phys.

Arbitrary amplitude dust-acoustic double-layers (DA-DLs) in two high-energy tail ion distributions are investigated. The electron number density has been assumed sufficiently depleted during the charging of dust grains on account of the attachment of background plasma electrons on the surface of dust grains. It is found that under certain conditions DA-DLs may be admitted. The degree of suprathermality of the low-temperature component has a sensitive role on their formation and a small change in this degree can even prevent the DL formation. The ‘Maxwellianization’ of the high-temperature component involves a suprathermalization process of the low-temperature component for the existence of localized DA-DLs. Our results may be relevant to a number of space dusty plasma systems, particularly the Saturn's F-ring where electron depletion and suprathermality are thought to come into play.

Theory and particle simulation of nonlinear double layers in a magnetized plasma

Kim²,

2007

Physics of Plasmas

Theoretical investigation and particle simulation of obliquely propagating nonlinear double layers (NDLs) of nonmonotonic type are performed in a magnetized plasma, which consists of a positively charged ion fluid and trapped, as well as free electrons. The modified Zakharov-Kuznetsov equation is derived by the usual reductive perturbation technique in a three-dimensional system. A nonlinear double layer solution is presented. Furthermore using Sagdeev’s pseudopotential technique, nonlinear double layer solution, which is associated with a set of nonlinear eigenvalue conditions, is also presented. These solutions are the analytic extensions of the monotonic double layers and solitary holes. The effects of physical parameters of nonlinear double layers are discussed. In particle simulations of a current driven system, physical relations among the obliqueness, the propagating velocity, the inverse scale length, and the maximum potential are investigated. The maximum potential and the width of the NDL decreases as the degree of the angle increases. In a chosen field, a decrease of potential width (or maximum potential) is clearly shown in the case of less than 10°. Variation of propagating velocity is clearly shown in the range of 10°–16°. Particle simulations are performed with an axially bounded electrostatic particle-in-cell code XPDP1, which is a workstation version of a one-dimensional bounded plasma code PDW1 [J. Comput. Phys. 80, 253 (1989)]. These particle simulation results are in good agreement with the qualitative theoretical results.