Evolution of linearly polarized electromagnetic pulses in laser plasmas

2008 ◽  
Vol 15 (9) ◽  
pp. 093108 ◽  
Author(s):  
J. Borhanian ◽  
S. Sobhanian ◽  
I. Kourakis ◽  
A. Esfandyari-Kalejahi
Keyword(s):  
Electromagnetic Pulses ◽  
Laser Plasmas ◽  
Linearly Polarized

scholarly journals Decoherent Excitation of Transverse Free Currents in Dielectric Liquids via Inter-Molecular Interactions

2021 ◽  
Vol 9 ◽  
Author(s):  
C. S. DiLoreto ◽  
C. Rangan
Keyword(s):  
Short Duration ◽  
Incident Light ◽  
Optical Scattering ◽  
Lower Field ◽  
Electromagnetic Pulses ◽  
Dielectric Liquids ◽  
Dipole Interactions ◽  
Linearly Polarized ◽  
Two Level Systems ◽  
Dense Cluster

We present a theoretical model for a class of optical scattering experiments in which short-duration, linearly-polarized electromagnetic pulses scatter off dielectric liquids. The pattern of scattering, particularly in the transverse direction, indicates that significant free currents are generated in the direction orthogonal to the polarization of the incident light. Modelling the target as a dense cluster of two-level systems, we show that transverse free currents are produced by short duration, electric-dipole interactions between proximate molecules, and result in scattering patterns similar to those observed in the experiments. Calculations provide a rationale for why these scattering patterns are not observed in the same molecules at lower densities or with lower field intensities. These features make this model a relevant alternative to proposed transverse optical magnetism theories.

Coherently enhanced electromagnetic pulses from midinfrared-driven laser plasmas

2020 ◽  
Author(s):  
Alexander Mitrofanov ◽  
Dmitry Sidorov-Biryukov ◽  
Maxim Nazarov ◽  
Alexander Voronin ◽  
Mikhail Rozhko ◽  
...  
Keyword(s):  
Electromagnetic Pulses ◽  
Laser Plasmas

scholarly journals Stability and evolution of electromagnetic solitons in relativistic degenerate laser plasmas

2020 ◽  
Vol 86 (6) ◽  
Author(s):  
Sima Roy ◽  
A. P. Misra
Keyword(s):  
Soliton Solutions ◽  
Slow Motion ◽  
Intense Laser ◽  
Electron Mass ◽  
Weakly Nonlinear ◽  
Laser Plasmas ◽  
Linearly Polarized ◽  
Motion Approximation ◽  
The Stability ◽  
Degeneracy Parameter

The dynamical behaviours of electromagnetic (EM) solitons formed due to nonlinear interaction of linearly polarized intense laser light and relativistic degenerate plasmas are studied. In the slow-motion approximation of relativistic dynamics, the evolution of weakly nonlinear EM envelope is described by the generalized nonlinear Schrödinger (GNLS) equation with local and nonlocal nonlinearities. Using the Vakhitov–Kolokolov criterion, the stability of an EM soliton solution of the GNLS equation is studied. Different stable and unstable regions are demonstrated with the effects of soliton velocity, soliton eigenfrequency, as well as the degeneracy parameter $R=p_{Fe}/m_ec$ , where $p_{Fe}$ is the Fermi momentum and $m_e$ the electron mass and $c$ is the speed of light in vacuum. It is found that the stability region shifts to an unstable one and is significantly reduced as one enters from the regimes of weakly relativistic $(R\ll 1)$ to ultrarelativistic $(R\gg 1)$ degeneracy of electrons. The analytically predicted results are in good agreement with the simulation results of the GNLS equation. It is shown that the standing EM soliton solutions are stable. However, the moving solitons can be stable or unstable depending on the values of soliton velocity, the eigenfrequency or the degeneracy parameter. The latter with strong degeneracy $(R>1)$ can eventually lead to soliton collapse.

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

Natural ELF Electromagnetic Pulses

1997 ◽  
Vol 51 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Alexander P. Nikolaenko
Keyword(s):  
Electromagnetic Pulses

scholarly journals Feasibility Study on the Development of a Deployable Tactical EMP Tent for a Sustainable Military Facility

2020 ◽  
Vol 13 (1) ◽  
pp. 16
Author(s):  
Kukjoo Kim ◽  
Kyung-Ryeung Min ◽  
Young-Jun Park
Keyword(s):  
Korean Peninsula ◽  
Military Operations ◽  
Shielding Effectiveness ◽  
Electromagnetic Pulses ◽  
Fixed Weight ◽  
Operational Readiness ◽  
The Military ◽  
Transaction Price ◽  
Delphi Analysis ◽  
Weight Structures

The Korean peninsula is under increasing threat of electromagnetic pulses (EMPs) from neighboring countries; EMP protection facilities are an essential means of ensuring the operational readiness of the military. However, existing EMP protection facilities are manufactured as fixed-weight structures, which limit the mobility of military operations and lead to the misconception of EMP protection as something only required for higher command. The current military and official EMP protection standards require only a uniform shielding effectiveness of 80 dB. Therefore, this study aims to differentiate the existing uniform level of shielding effectiveness of 80 dB into 80 dB, 60 dB, 40 dB, etc. Further, it seeks to derive the factors to be considered when applying various methods, such as shielding rooms, shielding racks, site redundancy, spare equipment, and portable lightweight protective tents, for recovery of failure, instead of the existing protection facilities that rely on shielded rooms by the Delphi analysis. Then, the applicability of lightweight EMP protection is determined after selecting lightweight materials to build a facility. The electromagnetic shielding performance of 21 types of materials was measured in the 30 MHz–1.5 GHz frequency band using ASTM-D-4935-10. The results showed the possibility of developing a lightweight EMP shielding facility, which would save approximately 316,386 tons of concrete, reducing the CO2 emissions by approximately 9,972,489 tons. Assuming that the Korean carbon transaction price is USD 50/ton CO2, the savings are equivalent to USD 49,862,435.

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