Home  About us  Contact
 

Plasma System (plasma + system)

Distribution by Scientific Domains
Physics and Astronomy80%

Selected Abstracts

Screening Breakdown in a Plasma by Two Laser Fields and Strong DC Magnetic Field

CONTRIBUTIONS TO PLASMA PHYSICS, Issue 1 2005
D. F. Miranda
Abstract The effective static dielectric constant of an electron plasma system in the simultaneous presence of two electromagnetic waves and a strong DC magnetic field is calculated. It is found that as the difference ,, of the two electromagnetic wave frequencies matches the plasma frequency ,, a breakdown in screening occurs thereby increasing the plasma heating rate via the external fields due to inverse Bremmstrahlung. An application is made by considering the typical parameters of a hot plasma. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Counterstreaming magnetized plasmas with kappa distributions , I. Parallel wave propagation

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 1 2008
M. Lazar
ABSTRACT Non-thermal particle distributions of kappa type are frequently encountered in collisionless plasmas from space. The electromagnetic emissions coming from space are believed to originate in the counterstreaming structures of plasmas, which are ubiquitous in many astrophysical systems. Here, we investigate the dispersion properties and the stability of a counterstreaming plasma system with temperature anisotropies modelled by a bi-kappa distribution function. The numerical evaluation of parallel modes shows growth rates lower than those obtained for Maxwellian plasmas, with a strong dependence on the spectral index of the particle distribution function. If all other parameters are known, measuring the instability growth time can provide a possible tool for the determination of the spectral index ,. [source]

Direct observation of Landau damping in a solid state plasma

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2008
M. P. Hasselbeck
Abstract We use ultrafast THz spectroscopy to study Landau damping in a coherent plasma system. A series of InSb-based bulk heterostructures provide increasing spatial confinement that restricts the scattering wave vector in the electron-electron interaction. This results in a dramatic reduction of the plasma contribution to the radiation signal. The experimental results are explained by model calculations. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

The synergetic effect of plasma and catalyst on simultaneous removal of SO2 and NOx

ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 3 2010
Jun Han
Abstract For the requirements of nitric oxide(NOx) and sulfur dioxide(SO2) removal in coal-fired power plant, a new nonthermal plasma system combined with catalyst was developed. Moreover, the effect of parameters such as temperature, atmosphere, residence time and additives (NH3 and methanol) on NOx (NO and NO2) and SO2 conversion rate was also experimentally evaluated. The results indicated that the new system could greatly promote the NOx conversion rate. As for SO2, the new system only had a slight influence. High temperature suppressed the NO oxidization and slightly promoted the SO2 oxidation. The long residence time was beneficial to the NOx and SO2 oxidization. In the absence of water, the additive of NH3 can improve NO, NOx and SO2 oxidization rate due to the reactions between NH3 and NOx or SO2. Contrary to NH3, methanol had a negative effect on NOx and SO2 oxidization. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd. [source]

Light,matter interaction in finite-size plasma systems

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 10 2007
W. Hoyer
Abstract It is well known that electromagnetic waves with frequencies below the plasma frequency cannot propagate inside an electron plasma. For plasmas with infinite extensions, this property can be mathematically described by a Bogoliubov transformation of the photonic operators. More generally, the presence of finite-size electron plasmas such as laser-induced atmospheric light strings or metallic nano structures including metamaterials leads to a modification of the light,matter interaction. It is shown how this geometric property can be fully accounted for with the help of adapted mode functions used for the quantization of the electromagnetic field. In addition to the analytical derivations, numerical results for luminescence spectra out of quasi-two-dimensional, planar plasma sheets are presented. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]