Radially sheared azimuthal flows and turbulent transport in a cylindrical plasma
A radially sheared azimuthal flow is observed in a cylindrical helicon plasma device without any apparent external sources of angular momentum input. Broadband fluctuations combined with a chain of co...
A radially sheared azimuthal flow is observed in a cylindrical helicon plasma device without any apparent external sources of angular momentum input. Broadband fluctuations combined with a chain of co...
Driven reconnection about a magnetic X point in weakly collisional plasmas
The effect of the Hall term in the process of forced magnetic reconnection for an X point magnetic field configuration, both in the collisionless limit and in the case of weak resistive dissipation, i...
The effect of the Hall term in the process of forced magnetic reconnection for an X point magnetic field configuration, both in the collisionless limit and in the case of weak resistive dissipation, i...
Slowly varying envelope kinetic simulations of pulse amplification by Raman backscattering
Phys. Plasmas 11, 5204 (2004); doi:10.1063/1.1796351
Published 22 October 2004
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A numerical code based on an eikonal formalism has been developed to simulate laser-plasma interactions, specifically Raman backscatter (RBS). In this code, the dominant laser modes are described by their wave envelopes, avoiding the need to resolve the laser frequency; appropriately time-averaged equations describe particle motion. The code is fully kinetic, and thus includes critical physics such as particle trapping and Landau damping which are beyond the scope of the commonly used fluid three-wave equations. The dominant forces on the particles are included: the ponderomotive force resulting from the beat wave of the forward and backscattered laser fields and the self-consistent plasma electric field. The code agrees well, in the appropriate regimes, with the results from three-wave equations and particle-in-cell simulations. The effects of plasma temperature on RBS amplification are studied. It is found that increasing the plasma temperature results in modification to particle trapping and the saturation of RBS, even before the onset of Landau damping of the plasma wave. This results in a reduction in the coupling efficiency compared to predictions based on the three-wave equations.
©2004 American Institute of Physics
| History: | Received 29 April 2004; accepted 28 July 2004; published 22 October 2004 |
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http://link.aip.org/link/?PHPAEN/11/5204/1 |
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KEYWORDS and PACS
plasma simulation,
plasma light propagation,
plasma kinetic theory,
stimulated Raman scattering,
laser modes,
plasma nonlinear processes,
plasma temperature,
plasma waves,
optical pulse generation
- 52.65.Rr
Particle-in-cell method (plasma simulation) - 52.35.Mw
Nonlinear phenomena: plasma waves, wave propagation and other interactions including parametric effects, mode coupling, ponderomotive effects, etc - 52.38.Bv
Rayleigh scattering; stimulated Brillouin and Raman scattering in plasmas - 52.25.Dg
Plasma kinetic equations - 52.25.Os
Emission, absorption, and scattering of electromagnetic radiation from plasmas - YEAR: 2004
RELATED DATABASES
PUBLICATION DATA
1070-664X (print)
1089-7674 (online)
AIP
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