Landau damping of Langmuir twisted waves with kappa distributed electrons

Abstract

The kinetic theory of Landau damping of Langmuir twisted modes is investigated in the presence of orbital angular momentum of the helical (twisted) electric field in plasmas with kappa distributed electrons. The perturbed distribution function and helical electric field are considered to be decomposed by Laguerre-Gaussian mode function defined in cylindrical geometry. The Vlasov-Poisson equation is obtained and solved analytically to obtain the weak damping rates of the Langmuir twisted waves in a nonthermal plasma. The strong damping effects of the Langmuir twisted waves at wavelengths approaching Debye length are also obtained by using an exact numerical method and are illustrated graphically. The damping rates of the planar Langmuir waves are found to be larger than the twisted Langmuir waves in plasmas which shows opposite behavior as depicted in Fig. 3 by J. T. Mendoça [Phys. Plasmas 19, 112113 (2012)].

Effect of orbital angular momentum on electron acoustic waves in double‐Kappa plasma

“…The study of plasma dynamics with finite OAM has predicted new effects and nontrivial properties attributed to finite OAM in plasmas. The examples are twisted waves and associated instabilities [ Mendonca et al , ; Mendonca , ; Shukla , ; Khan et al , ; Arshad et al , , ].…”

Kinetic study of ion acoustic twisted waves with kappa distributed electrons

“…The resultant equation is then multiplied by F pl and integrated in rdr with orthogonality condition described in Ref. 34. After applying the orthogonality condition, the final form of resultant equation is given as…”

“…By definition of Laguerre-Gaussian (LG) function F pl ðr; zÞ (which is described in Ref. 34 with its properties as well), the potential /ðr; tÞ can be written as follows:…”

“…[31][32][33] These non-thermal charged particles in most of the cases are electrons that can be described well by using generalized Lorentzian or kappa (non-Maxwellian) distribution function. 34 In this manuscript, kinetic theory is applied to study the ion acoustic waves in the presence of electric field carrying orbital angular momentum in a plasma containing Maxwellian ions and non-Maxwellian electrons described by the Maxwellian and generalized Lorentzian or kappa distribution functions. The manuscript is composed of various sections.…”

Multi-component Dust-ion-acoustic Solitary and Shock Waves in an Unmagnetized Dusty Plasma with Kappa Distributed Superthermal Electrons

“…They have shown that the DIA waves can support solitary structures associated with both positive and negative potential due to the presence of non-thermal electrons in their dusty plasma model. However, a lot of theoretical observations of space plasmas [19,20,21,22,23,24,25,26] are often characterized by a particle distribution function with high energy tail and they may deviate from the Maxwellian distribution. Superthermal particles may arise due to the effect of external forces acting on the natural space environment plasmas or to wave particle interaction.…”