scholarly journals Particle-in-cell Simulations of Raman Forward Scattering Instability in Low-density Plasmas: A Computational Study

2012 ◽  
Vol 2 (6) ◽  
pp. 215-220
Author(s):  
Alireza Heidari ◽  
Seyedali Vedad Fatemeh Ghorbani ◽  
Mohammadali Ghorbani
Keyword(s):  
Computational Study ◽  
Forward Scattering ◽  
Low Density ◽  
Particle In Cell

Particle-in-cell simulations of Raman forward scattering from short-pulse high-intensity lasers

1994 ◽  
Vol 50 (5) ◽  
pp. R3338-R3341 ◽  
Author(s):  
C. D. Decker ◽  
W. B. Mori ◽  
T. Katsouleas
Keyword(s):  
High Intensity ◽  
Short Pulse ◽  
Forward Scattering ◽  
Particle In Cell

scholarly journals Evolution of a high-density electron beam in the field of a super-intense laser pulse

2008 ◽  
Vol 26 (3) ◽  
pp. 397-409 ◽  
Author(s):  
V.V. Kulagin ◽  
V.A. Cherepenin ◽  
M.S. Hur ◽  
J. Lee ◽  
H. Suk
Keyword(s):  
Electron Beam ◽  
Laser Pulse ◽  
Equations Of Motion ◽  
Thomson Scattering ◽  
High Density ◽  
Intense Laser ◽  
Low Density ◽  
Intense Laser Pulse ◽  
Particle In Cell ◽  
The One

AbstractThe evolution of a high-density electron beam in the field of a super-intense laser pulse is considered. The one-dimensional (1D) theory for the description of interaction, taking into account the space-charge forces of the beam, is developed, and exact solutions for the equations of motion of the electrons are found. It was shown that the length of the high-density electron beam increases slowly in time after initial compression of the beam by the laser pulse as opposed to the low-density electron beam case, where the length is constant on average. Also, for the high-density electron beam, the sharp peak frozen into the density distribution can appear in addition to a microbunching, which is characteristic for a low-density electron beam in a super-intense laser field. Characteristic parameters for the evolution of the electron beam are calculated by an example of a step-like envelope of the laser pulse. Comparison with 1D particle-in-cell simulations shows adequacy of the derived theory. The considered issue is very important for a special two-pulse realization of a Thomson scattering scheme, where one high-intensity laser pulse is used for acceleration, compression and microbunching of the electron beam, and the other probe counter-streaming laser pulse is used for scattering with frequency up-shifting and amplitude enhancement.

scholarly journals Plasma and BIAS Modeling: Self-Consistent Electrostatic Particle-in-Cell with Low-Density Argon Plasma for TiC

2011 ◽  
Vol 2011 ◽  
pp. 1-13
Author(s):  
Jürgen Geiser ◽  
Sven Blankenburg
Keyword(s):  
Physical Vapor Deposition ◽  
Cell Model ◽  
Finite Size ◽  
Argon Plasma ◽  
Thin Film Deposition ◽  
Deposition Process ◽  
Film Deposition ◽  
Low Density ◽  
Particle In Cell ◽  
Self Consistent

We motivate our study by simulating the particle transport of a thin film deposition process done by PVD (physical vapor deposition) processes. In this paper we present a new model taken into account a self-consistent electrostatic-particle in cell model with low density Argon plasma. The collision model are based of Monte Carlo simulations is discussed for DC sputtering in lower pressure regimes. In order to simulate transport phenomena within sputtering processes realistically, a spatial and temporal knowledge of the plasma density and electrostatic field configuration is needed. Due to relatively low plasma densities, continuum fluid equations are not applicable. We propose instead a Particle-in-cell (PIC) method, which allows the study of plasma behavior by computing the trajectories of finite-size particles under the action of an external and self-consistent electric field defined in a grid of points.

A computational study of elongated pore interactions in a low density porous copper

1997 ◽  
Vol 230 (1-2) ◽  
pp. 14-24 ◽  
Author(s):  
Anthony Kee ◽  
Peter Matic ◽  
Jeffrey M. Wolla
Keyword(s):  
Computational Study ◽  
Low Density ◽  
Porous Copper

scholarly journals Diagnostics of peak laser intensity based on the measurement of energy of electrons emitted from laser focal region

2015 ◽  
Vol 33 (3) ◽  
pp. 361-366 ◽  
Author(s):  
M. Kalashnikov ◽  
A. Andreev ◽  
K. Ivanov ◽  
A. Galkin ◽  
V. Korobkin ◽  
...  
Keyword(s):  
Laser Intensity ◽  
Laser Pulses ◽  
Maximum Energy ◽  
Beam Waist ◽  
Focal Region ◽  
Low Density ◽  
Particle In Cell ◽  
Peak Intensity ◽  
Low Density Plasma ◽  
Density Plasma

AbstractA new method to determine the peak intensity of focused relativistic laser pulses is experimentally justified. It is based on the measurement of spectra of electrons, accelerated in the beam waist. The detected electrons were emitted from the plasma, generated by nonlinear ionization of low-density gases (helium, argon, and krypton) in the focal area of a laser beam with the peak intensity >1020 W/cm2. The measurements revealed generation of particles with the maximum energy of a few MeV, observed at a small angle relative to the beam axis. The results are supported by numerical particle-in-cell simulations of a laser–low-density plasma interaction. The peak intensity in the focal region derived from experimental data reaches the value of 2.5 × 1020 W/cm2.

scholarly journals Low-density superhard materials: computational study of Li-inserted B-substituted closo-carboranes LiBC11 and Li2B2C10

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 52695-52699 ◽  
Author(s):  
Xiaolei Feng ◽  
Xinyu Zhang ◽  
Hanyu Liu ◽  
Xin Qu ◽  
Simon A. T. Redfern ◽  
...  
Keyword(s):  
Computational Study ◽  
Low Density ◽  
Superhard Materials ◽  
Carbon Cage

Insertion of Li atoms into a B-substituted carbon cage produces two superhard compounds with relatively low density: LiBC11 and Li2B2C10.

scholarly journals An Experimental and Computational Study of the High-Velocity Impact of Low-Density Aluminum Foam

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1949
Author(s):  
Matej Borovinšek ◽  
Matej Vesenjak ◽  
Kazuyuki Hokamoto ◽  
Zoran Ren
Keyword(s):  
Computer Simulations ◽  
High Velocity ◽  
Aluminum Foam ◽  
Computational Study ◽  
Rigid Wall ◽  
Low Density ◽  
High Velocity Impact ◽  
Foam Sample ◽  
Velocity Impact ◽  
The Impact

The study presents the results of an experimental and computational study of the high-velocity impact of low-density aluminum foam into a rigid wall. It is shown that the aluminum foam samples deformed before hitting the rigid wall because of the high inertial forces during the acceleration. During the impact, the samples deformed only in the region contacting the rigid wall due to the high impact velocity; the inertial effects dominated the deformation process. However, the engineering stress–strain relationship retains its typical plateau shape until the densification strain. The experimental tests were successfully reproduced with parametric computer simulations using the LS-DYNA explicit finite element code. A unique computational lattice-type model was used, which can reproduce the randomness of the irregular, open-cell structure of aluminum foams. Parametric computer simulations of twenty different aluminum foam sample models with randomly generated irregular lattice structures were carried out at different acceleration levels to obtain representative statistical results. The high strain-rate sensitivity of low-density aluminum foam was also observed. A comparison of experimental and computational results during aluminum foam sample impact shows very similar deformation behavior. The computational model correctly represents the real impact conditions of low-density aluminum foam and can be recommended for use in similar high-velocity impact investigations.

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