Related Concept Videos
01:27Electrostatic Boundary Conditions in Dielectrics
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
01:28Magnetostatic Boundary Conditions
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
01:17Steady, Laminar Flow Between Parallel Plates
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
01:16Electrostatic Boundary Conditions
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
01:30The Hall Effect
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
You might also read
Related Articles
Articles linked to this work by shared authors, journal, and citation graph.
Sort by
Same author
Wavelength modulation laser-induced fluorescence for plasma characterization.
The Review of scientific instruments·2024
Same author
Growth of metal nanoparticles in hydrocarbon atmosphere of arc discharge.
Nanotechnology·2024
Same author
A confocal laser-induced fluorescence diagnostic with an annular laser beam.
The Review of scientific instruments·2023
Related Experiment Video
Updated: May 7, 2026
08:10
Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
Published on: May 25, 2021
Sheath-induced instabilities in plasmas with E0×B0 drift.
A I Smolyakov1, W Frias, I D Kaganovich
1Department of Physics and Engineering Physics, University of Saskatchewan 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada.
Physical Review Letters
|October 1, 2013
Summary
Ion acoustic waves in plasmas become unstable due to plasma current closure at chamber walls. This instability enhances conductivity and electron transport, though metal walls partially mitigate its effects.
Area of Science:
- Plasma physics
- Wave-particle interactions
- Condensed matter physics
Background:
- Plasma devices with E0×B0 electron drift are crucial for various applications.
- Understanding near-wall phenomena is essential for plasma confinement and control.
- Ion acoustic waves play a significant role in plasma dynamics.
Purpose of the Study:
- To investigate the instability of ion acoustic waves in plasmas with E0×B0 electron drift.
- To determine the impact of plasma current closure at chamber walls on wave stability.
- To analyze the influence of wall material properties on the instability.
Main Methods:
- Theoretical analysis of plasma wave behavior.
- Modeling of plasma current closure effects.
- Simulation of wave propagation and growth rates.
Main Results:
- Ion acoustic waves become unstable due to plasma current closure at chamber walls.
- Unstable modes enhance near-wall conductivity and turbulent electron transport.
- High dielectric permittivity of walls (e.g., metal) reduces instability growth rate by an order of magnitude but does not eliminate it.
Conclusions:
- Plasma current closure at chamber walls is a key mechanism for ion acoustic wave instability.
- The instability has significant implications for electron transport and conductivity in bounded plasmas.
- Wall material selection can influence, but not completely suppress, this instability, highlighting the importance of material science in plasma device design.