Particle In Cell Simulation Of Capacitively Coupled Plasma In The Presence Of Coulomb Collisions And Secondary Electron Emission

We propose a computational method to self-consistently model small angle collisional effects. This method may be added to standard Particle-In-Cell (PIC) plasma simulations to include collisions, or as an alternative to solving the Fokker-Planck (FP) equation using finite difference methods. The distribution function is represented by a large number of particles. The particle velocities change due to the drag force, and the diffusion in velocity is represented by a random process. This is similar to previous Monte-Carlo methods except we calculate the drag force and diffusion tensor self- consistently. The particles are weighted to a grid in velocity space and associated Poisson equations'' are solved for the Rosenbluth potentials. The motivation is to avoid the very time consuming method of Coulomb scattering pair by pair. First the approximation for small angle Coulomb collisions is discussed. Next, the FP-PIC collision method is outlined. Then we show a test of the particle advance modeling an electron beam scattering off a fixed ion background. 4 refs.

Without plasma processing techniques, recent advances in microelectronics fabrication would not have been possible. But beyond simply enabling new capabilities, plasma-based techniques hold the potential to enhance and improve many processes and applications. They are viable over a wide range of size and time scales, and can be used for deposition,

Charged particles in dense matter exhibit strong correlations due to the exchange and Coulomb interactions, and thus make a strongly coupled plasma. Examples in laboratory and astrophysical settings include solid and liquid metals, semiconductors, charged particles in lower dimensions such as those trapped in interfacial states of condensed matter or beams, dense multi-ionic systems such a superionic conductors and inertial-confinement-fusion plasmas . The aim of the conference was to elucidate the various physical processes involved in these dense materials. The subject areas covered include plasma physics, atomic and molecular physics, condensed matter physics and astrophysics.

The first part of this monograph presents theoretical analysis of the thermophysical properties of strongly coupled coulomb systems. A new model is then developed, making it possible to calculate the full set of low temperature, multicomponent, nonideal plasma transport coefficients, based on the kinetic coefficients of strongly coupled coulomb systems and experimental data for the transport coefficients of Dense, Low temperature plasmas. This model can easily be implemented in the form of a set of computer algorithms, and the third part of the book shows how it can be used to solve important problems of high temperature gas dynamics, for example, heat and mass transfer in the shock layer of a space probe, stability of temperature and concentration fields in gas phase nuclear reactors, and critical phenomena in low temperature plasma dynamics.

The Advanced Study Institute on Strongly Coupled Plasmas was held on the campus of the Universite d'Orleans, Orleans-la-Source, France, from July 6th through July 23rd, 1977. 15 invited lecturers and 50 other participants attended the Institute. The present Volume contains the texts of most of the lectures and of some of the numerous seminars presented at the Institute. The topic of strongly coupled coulomb-systems has been an area of vigorous activities over the last few years. Such systems occur in a great variety of physical situations: stellar and planetary interiors, solid and liquid metals, semiconductors, laser compressed plasmas and gas discharges are some of the most important examples. All these systems have the common feature that for one or more of their constituent charged particle liquids the potential energy to kinetic energy ratio is not small, and therefore the application of the traditional plasma perturbation techniques is not feasible. Many ingenious theoretical schemes have been worked out in order to attack both the related equilibrium and nonequilibrium problems, and also various methods have been borrowed from areas where problems not dissimilar to the ones arising in coulomb-systems had already been tackled. At the same time, computer simulations have led to a probably unparalleled accumulation of data on the behavior of an ensemble of classical charged particles. For the first time, the Institute assembled workers from various disciplines who had been involved with diverse aspects of the strongly coupled plasma problem.