Study of laser-plasma beat wave current drive with an Eulerian Vlasov code

Ghizzo, A.; Bertrand, Pierre; Shoucri, M.; Johnston, T. W.; Fijalkow, E.; Feix, Marc; Demchenko, V. V.

doi:10.1088/0029-5515/32/1/i05

Cited by 13 publications

(12 citation statements)

References 8 publications

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“…13 also assumed slowly varying envelopes of the fields. The envelope equations can be written as (:t +VgO ~)ao= -KBa_aB-KFa+aF' (7) (:t -vg _ ~)a_=KBaoa~, (8) (:r +v g+ ~)a+=KFaoa;,…”

Section: B Simple Envelope Modelmentioning

confidence: 99%

Two-stage electron acceleration by simultaneous stimulated Raman backward and forward scattering

Bertrand¹,

Ghizzo²,

Karttunen

et al. 1995

Physics of Plasmas

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The coexistence of stimulated Raman forward and backward scattering of intense electromagnetic radiation, which can occur, for instance, in laser fusion plasmas, is investigated. The simultaneous Raman forward and backward scattering is shown to create an electrostatic field structure which is exceptionally efficient in producing highly relativistic electrons. The mechanism of the electron acceleration is analyzed both by Vlasov-Maxwell simulations with self-consistent fields and by test particle calculations with prescribed electrostatic fields. The Vlasov-Maxwell simulations reveal that the two plasma waves generated by the backward and forward scattering are spatially separated, and thus form a two-stage electron "accelerator."

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“…13 also assumed slowly varying envelopes of the fields. The envelope equations can be written as (:t +VgO ~)ao= -KBa_aB-KFa+aF' (7) (:t -vg _ ~)a_=KBaoa~, (8) (:r +v g+ ~)a+=KFaoa;,…”

Section: B Simple Envelope Modelmentioning

confidence: 99%

Two-stage electron acceleration by simultaneous stimulated Raman backward and forward scattering

Bertrand¹,

Ghizzo²,

Karttunen

et al. 1995

Physics of Plasmas

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“…The relevant equations for the problem we are studying have been presented previously (see, for instance, Appendix B in Ghizzo et al, 1992 for more details). We rewrite these equations in order to fix the notation.…”

Section: The Relevant Equations Of the Eulerian Vlasov Code And The Nmentioning

confidence: 99%

“…Subsequently, Humphrey et al (2013), studying the same problem, showed that the undesirable noise effects can be reduced by adding the collisions in the PIC simulations, as these damp the effects of thermal noise. This code has been previously successfully applied for instance to the problem of beat-wave current drive (Ghizzo et al, 1992). have also shown the difficulty of studying the SBS problems for laserpulse amplification with PIC codes, because of the intrinsic numerical noise associated with these codes.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of Raman and Brillouin laser-pulse amplification in a magnetized plasma

Shoucri

2016

Laser Part. Beams

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We apply an Eulerian Vlasov code to study the amplification of an ultra-short seed pulse via stimulated Raman and Brillouin backscattering of energy from a long pump pulse, assumed at constant amplitude, in a plasma embedded in an external magnetic field. Detailed analysis of the spectra developed during the amplification process are presented, together with the evolution showing the pump depletion, accompanied by the counter-propagating seed-pulse amplification, compression and increased steepness of the waveform. In addition to the problem of the amplification of ultra-short seed pulses, there is an obvious academic interest in the study of problems of amplification of electromagnetic waves observed in many situations in laboratory plasmas and in the magnetosphere and other geophysical situations, such as in the environments of planets, where important variations in the presence and strength of magnetic fields are observed. The numerical code solves a one-dimensional relativistic Vlasov-Maxwell set of equations for a plasma in a magnetic field for both electrons and ions. We also apply the code to the problem of wakefield acceleration. The absence of noise in the Eulerian Vlasov code allows one to follow the evolution of the system with an accurate representation of the phase-space structures of the distribution functions.

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“…The momentum P 1 satisfies the "fluid" equation (a a )PL=PiXn,-eAle range where the stimulated Raman forward scattering (12) dominates over the backscattering. (13) wave).…”

Section: A Vlasov-maxwell Codementioning

confidence: 99%

Simulations of wave–particle interactions in stimulated Raman forward scattering in a magnetized plasma

Bertrand¹,

Ghizzo²,

Karttunen

et al. 1992

Physics of Fluids B: Plasma Physics

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Stimulated Raman forward scattering in a high-temperature, magnetized plasma is investigated with relativistic Vlasov–Maxwell simulations and with envelope and test particle calculations. The parameters correspond to Raman current drive by free-electron lasers in reactor grade tokamak plasmas. The phase velocity of the Raman excited plasma wave is large, and therefore the Landau damping is initially weak. The electron plasma wave grows to a large amplitude and accelerates electrons to high energies. Simultaneous pump depletion weakens the driving ponderomotive force, which leads to a collapse of the plasma wave if the number of the interacting electrons is large enough. Spatially the wave–particle interaction takes place in a distance of a few wavelengths of the plasma wave. The electron energies can largely exceed the kinetic energy at the phase velocity of the electron plasma wave. Short-wavelength amplitude modulations of the plasma wave appear at high amplitudes. Efficient generation of the nonresonant anti-Stokes wave and of the second Stokes wave are also observed. Analytical growth rates and envelope calculations explain well the early evolution of the Raman process. Later on, nonlinear wave–particle interactions and relativistic effects start to dominate, and the system is not satisfactorily described by simple envelope equations.

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Study of laser-plasma beat wave current drive with an Eulerian Vlasov code

Cited by 13 publications

References 8 publications

Two-stage electron acceleration by simultaneous stimulated Raman backward and forward scattering

Two-stage electron acceleration by simultaneous stimulated Raman backward and forward scattering

Numerical simulation of Raman and Brillouin laser-pulse amplification in a magnetized plasma

Simulations of wave–particle interactions in stimulated Raman forward scattering in a magnetized plasma

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