(Digital Presentation) Temporal Evolution of Kinetic Energy in Two Different Plasma Systems

Abstract

During the last few decades, simulation has emerged as a powerful new tool. Numerous branches of science and engineering have been revolutionized by computer simulations. Through the use of particle-in-cell simulation systems comprising many species, including electrons, ions, neutrals, molecules, dust particles, etc., are studied by the plasma research community. The current work attempts to investigate the kinetic energy behavior in two various electrostatic plasma systems using a 1D PIC simulation. Two homogeneous and non-collisional systems are considered. In the first system, just cold electrons are present. Along with cold electrons, the second system also contains electrons with a thermal velocity of 0.4 ωpe/K . In other words, the second system includes two kinds of electrons (cold and warm electrons). The same initial perturbation is applied to both systems at t=0 s. Ions are assumed to be infinitely massive and only serve as a neutralizing background for electrons.Diagrams of I, II, and III represent the kinetic energy of cold electrons, kinetic energy of electrons with a thermal velocity of 0.4 ωpe/K, and the total kinetic energy, respectively. It is worth noting that kinetic energy of cold electrons is equal to total kinetic energy in the first system. From the comparison of Figs. 1(a) and (b), it can be understood that when there is a cold type of electron in the system, the particles receive energy from the wave, but in a system that contains two types of cold and warms electrons, only warm electrons will receive energy from the wave and the kinetic energy of these warm particles increases. In contrast to Fig. 1(a), cold electrons give energy to the system. Additionally, in both cases, the total kinetic energy increases and as time goes on, the system approximates to stability and fluctuations decline. This result indicates that not only all the initial energy is not absorbed by the environment, but also a portion of it will remain in the medium. Figure 1