Heat flux effect in ηi-mode driven solitary and shock waves in electron-positron-ion plasma

Abstract

The specific role of ion heat flux on the characteristics of the linear and nonlinear ion temperature gradient (ηi) driven mode in inhomogeneous electron-positron-ion plasma is presented. Inhomogeneity in density, temperature, and the magnetic field is considered. A modified linear dispersion relation is obtained, and its different limiting cases are when ηi 2/3, ωD(gradient in magnetic field) = 0 and β(density ratio of plasma species) = 1 are discussed. Furthermore, an expression for the anomalous transport coefficient of the present model is obtained. Nonlinear structure solutions in the form of solitons and shocks show that mode dynamics enhance in the presence of ion heat flux in electron-positron-ion plasma. The present study is essential in energy confinement devices such as tokamak because the heat flux observed experimentally in tokamak plasma is much higher than those described by collisions. Further, it could be helpful to understand the nonlinear electrostatic excitations in the interstellar medium.

Ion temperature gradient mode linear and nonlinear structures in electron-ion plasma, with stationary charged dust grain

“…These nonlinear structure have been studied both in homogeneous and inhomogeneous plasma. These studies reveals as reported in various studies that the speed, amplitude and width modify, which either increase/decrease the transportation property of these nonlinear structures (Hoshino et al, 1992;Murad et al, 2021;Zakir U and ul Haque, 2022). Ion temperature gradient which was first reported by Rudakov and later studied by number of researchers is considered as a main character in the confinement devices such as in tokamak (Khan, Zakir, ul Haque and Qamar, 2021;Jehan et al, 2009;Khan et al, 2020;Khan, Ullah and Haque, 2021;Khan et al, 2022).…”

Nonlinearity of ion temperature gradient mode with entropy drift

“…The kinetic model and inhomogeneous electric field were used to analyse an ion temperature gradient (ITG) mode that caused instability in a shear slab shape in [17], which showed that the growth and transport rate for heat and particles decreased with the electric field. According to [18], the rate of instability is highest for cairndistribution electrons, lowest for Maxwellian, and intermediate for super thermal or kappa distributions.…”