Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Particle-In-cell Simulations of Nonlocal and Nonlinear Effects in Inductively Coupled Plasmas
Anomalous and Nonlinear Effects in Inductively Coupled Plasmas
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In this thesis the nonlinear effects and heating are studied in inductively coupled plasma (ICP) in a regime of anomalous skin effect (nonlocal regime). In this regime the thermal motion of plasma electrons plays an important role, significantly influencing the processes associated with the penetration of electromagnetic field into plasma, such as the ponderomotive effect and heating of plasma by the field. We have developed a linear kinetic theory that describes the electron dynamics in ICP taking into account the electron thermal motion and collisions of electrons. This theory yields relatively simple expressions for the electron current in plasma, the ponderomotive force, and plasma heating. It describes correctly the thermal reduction of ponderomotive force in the nonlocal regime, which has been previously observed experimentally. It also describes the collisionless heating of plasma due to resonant interaction between the electromagnetic wave and plasma electrons. There is a good overall agreement of the results of our theory with the experimental data on ponderomotive force and plasma heating. Using our theory, we predicted a new effect of reduction of plasma heating compared to the purely collisional value, occurring at low frequencies. This effect has not been previously reported. The nonlinear effects of the electromagnetic field on the electron distribution function and on plasma heating, that are not accounted for in the linear kinetic theory, have been studied using a quasilinear kinetic theory, also developed in this thesis. Within the quasilinear approximation we have formulated the system of equations describing the slow response of plasma electrons to the fast oscillating electromagnetic field. As an example, these equations have been solved in the simplest case of cold plasma with collisions, and the nonlinear perturbation of the electron distribution function and its effect on the plasma heating have been found. It has been shown that the nonlinear.
Nonlinear Effects in Low Frequency Inductive Plasmas
Author: A. I. SmolyakovPublisher:
ISBN:
Category :
Languages : en
Pages : 2
Book Description
Modern inductively coupled plasma (ICP) sources tend to operate at low frequencies (several MHz and less) that reduces capacitive coupling and transmission line effects and leads to simpler and lower cost rf power sources and matching circuits. Together with a low neutral gas pressure (1-10 mTorr) this creates a unique combination of conditions where two features of inductively coupled plasmas become most prominent: anomalous (non-collisional) heating and nonlinearity due to the Lorentz force. When the electrons are weakly collisional, the collisionless wave particle interaction (Landau damping) replaces real collisions and becomes the main mechanism of the wave absorption and plasma heating 1. In this regime, the electron mean free path exceeds the characteristic plasma length scale so that electrons "sample" the electric field over large distance resulting in the electric current being not a local function of the electric field. This regime is often referred to as nonlocal regime as opposite to the local, or short mean free path, highly collisional regime of the classical skin effect. The related property of the low frequency ICP is due to the fact that the nonlinear Lorentz force can be much larger than the force of the inductive electric field REGIME OF THE ELECTRON Hall magnetohydrodynamics (EMHD). Nonlinear forces in ICP may significantly affect plasma density profile 2, generate higher harmonics of the electric current 3, electrostatic potential 4,5, and modify the skin-effect 6. In this paper we review the experimental data and theoretical models describing these effects.
Nonlinear Effects in Plasmas
Author: Gabor KalmanPublisher:
ISBN:
Category : Nonlinear theories
Languages : en
Pages : 540
Book Description
Nonlinear Effects in Plasma
Author: V. TsytovichPublisher: Springer Science & Business Media
ISBN: 1468417886
Category : Science
Languages : en
Pages : 344
Book Description
For some time now there has been an interest in the nop. linear interaction of electromagnetic waves in plasma [1,2]. But only in the last few years has the theory of nonlinear wave inter action effects undergone such vigorous development as to result in the formulation of clear phYSical concepts regarding the mech anisms of interaction. This development has been engendered by attempts to solve many of the plasma-physical problems accom panying the tremendous growth of experimental research [3]. The importance of nonlinear effects in modern plasma physics is dis cussed in detail in Chap. I. At this point we merely stress the fact that today the analysis of nonlinear effects is a practical ne cessity in any experiment involving plasma instabilities. We should also point out that plasma instabilities can assert them selves extensively in solids (solid state plasma) and play an im portant part in the study of cosmic plasma. Consequently, the problems of nonlinear wave interaction in plasma are of concern to those working in widely different areas of physics. Yet it is difficult to assimilate the results of investigations on nonlinear effects, owing to the complicated way in which the results of orig inal research are presented. In the present book the author hopes in some measure to fill the need for a text on the physics of non linear effects that is accessible to a fairly general audience.
Simulation of Low-pressure Inductively Coupled Plasmas
Author: Badri RamamurthiPublisher:
ISBN:
Category : Plasma spectroscopy
Languages : en
Pages : 386
Book Description
Anomalous and Nonlinear Effects in Inductively Coupled Plasmas
Author: Yuriy Olegovich TyshetskiyPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Anomalous and Nonlinear Effects in Inductively Coupled Plasmas
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In this thesis the nonlinear effects and heating are studied in inductively coupled plasma (ICP) in a regime of anomalous skin effect (nonlocal regime). In this regime the thermal motion of plasma electrons plays an important role, significantly influencing the processes associated with the penetration of electromagnetic field into plasma, such as the ponderomotive effect and heating of plasma by the field. We have developed a linear kinetic theory that describes the electron dynamics in ICP taking into account the electron thermal motion and collisions of electrons. This theory yields relatively simple expressions for the electron current in plasma, the ponderomotive force, and plasma heating. It describes correctly the thermal reduction of ponderomotive force in the nonlocal regime, which has been previously observed experimentally. It also describes the collisionless heating of plasma due to resonant interaction between the electromagnetic wave and plasma electrons. There is a good overall agreement of the results of our theory with the experimental data on ponderomotive force and plasma heating. Using our theory, we predicted a new effect of reduction of plasma heating compared to the purely collisional value, occurring at low frequencies. This effect has not been previously reported. The nonlinear effects of the electromagnetic field on the electron distribution function and on plasma heating, that are not accounted for in the linear kinetic theory, have been studied using a quasilinear kinetic theory, also developed in this thesis. Within the quasilinear approximation we have formulated the system of equations describing the slow response of plasma electrons to the fast oscillating electromagnetic field. As an example, these equations have been solved in the simplest case of cold plasma with collisions, and the nonlinear perturbation of the electron distribution function and its effect on the plasma heating have been found. It has been shown that the nonlinear.
Scientific and Technical Aerospace Reports
Author: Plasma Physics Index
Author: Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 634
Book Description