Response of carbon and tungsten surfaces to hydrogen plasma of different temperatures

Abstract

The basic understanding of the interaction between energetic hydrogen plasma with carbon and tungsten based surfaces is crucially important for analyzing plasma-wall interaction in divertors of fusion devices and other plasma applications. The ion reflection coefficient, ion absorption coefficient, total ion charge density, and ion density distribution have been studied using a kinetic trajectory simulation model at different ion temperatures. It has been observed that the ion reflection coefficient and the ion absorption coefficient of the incident particles depend on kinetic energy: higher energy ions are less likely to be reflected as they have enough energy to bury themselves within the solid.

Variation of mean value of velocity of ion with different obliqueness of magnetized plasma sheath

“…For these, we need to consider the velocity distribution function for each species and follow the kinetic treatment. KTS is an iterative method for numerically calculating self consistent, time independent kinetic plasma states in some given bounded spatial region [3,12,13] For given necessary initial and boundary conditions the distribution functions of the particle species are calculated by solving the related kinetic equations along the respective trajectories.…”

“…We consider a 1d3v problem, i.e., the variation in plasma parameters is only along perpendicular to the wall (x-direction) whereas all three components of velocity are taken into account. This assumption is valid for studying a magnetized plasma sheath and is being used frequently [12]. The magnetic field lies in the x-y plane where ✓ is the angle made by the oblique magnetic field with the x -axis, such that…”

“…For given initial and boundary conditions, we start with an initial guess to the potential profile and solve the governing equations (equation of motion, Poisson equation, Vlasov equation and Bohm-Chodura condition) iteratively until a self-consistent result is achieved [12,13]. We consider plasma parameters at the presheath by satisfying quasi-neutrality condition, the sheath-edge singularity condition, continuity of the first three moments of each species, and the Bohm-Chodura condition.…”

“…The problem of plasma sheath is one of the oldest in plasma physics [2,6,7] and the magnetized plasma sheath continues to receive a considerable amount of attention [8][9][10][11][12]. The problem of sheath formation at the plasma boundary is of importance for nearly all applications where a plasma is confined to a finite volume.…”

Effect of Permittivity of Plasma Medium on the Particle Properties and Electric Field in a Magnetized Plasma Sheath

“…modified and extended in studying different magnetized plasma sheath problems [3,[12][13][14][15]. S. Farhad and M. Khoramabadi [16] studied the properties of the collisional magnetized sheath with two species of positive ions by using the fluid model.…”