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Plasma under Power Laser Pulse

#3260


Anomalous Acceleration and Heating of Electrons and Ions by Laser Pulse, Propagating Perpendicular to External Magnetic Field in Plasma Under the Conditions of Double Resonance (Parametric and Phase)

Tech Area / Field

  • PHY-OPL/Optics and Lasers/Physics
  • PHY-PLS/Plasma Physics/Physics

Status
3 Approved without Funding

Registration date
19.04.2005

Leading Institute
Keldysh Institute of Applied Mathematics, Russia, Moscow

Collaborators

  • Princeton University, USA, NJ, Princeton\nUniversity of Nevada / Department of Physics, USA, NV, Reno\nUniversity of California / Department of Physics and Astronomy, USA, CA, Los-Angeles

Project summary

The objective of the "Double resonance" project is conduct by efforts of the collective KIAM applied theoretical and numerical investigations on the problem of plasma acceleration and heating by powerful laser pulse in the presence of an external magnetic field. In particular, it will search for opportunity to increase the effectiveness of laser-plasma interaction under the conditions of double resonance (parametric and phase).

The foundation of this project is an effective new mechanism of transformation of the energy of a laser pulse, propagating perpendicular to the external magnetic field, into the energy of plasma oscillations. The powerful wake-field excitation is connected with decay instability of the extraordinary pump wave (ω0>ωp, ωp is the electron plasma frequency) associated with the laser pulse. This instability leads to excitation of two extraordinary waves (ω1=ω0/2) with the same phase velocities. Therefore the action on plasma electrons of the ponderomotive force connected with a parametrically unstable extraordinary pump wave, strongly enhances a longitudinal component of electric field of the excited extraordinary wave. The excited waves have the frequency ω1<ωp and this results in the rapid heating of plasma electrons. Analytical expressions for the growth rate and instability threshold will be obtained.

The new relativistic PIC code for solution of the two/three-dimensional relativistic Vlasov equation must be realized as a result of the project. We will use this code to corroborate the hydrodynamic theory and to investigate the kinetic stage of instability that accompanies by the transformation of approximately 85% of the energy of the laser pulse into the energy of plasma particles.

Our project makes possible to build up the package of applied programs for study of collective interaction between powerful laser pulse and plasma electrons and ions in the presence of an external magnetic field. This will help guide the development of ultra-intense laser-plasma interaction experiments at the Nevada Terawatt Facility at UNR and the development of laser-plasma technologies using powerful laser beams (like the problems of inertial controlled nuclear fusion and the problems of particle acceleration in plasma) elsewhere.

Lagrangian formulation for the problem of excitation of longitudinal electrostatic field by an intense laser pulse in magnetized plasma has developed by Krasovitskii et al. in paper [17]. Preliminary results of the theory and simulation obtained in self-consistent approximation were presented at the conference [18]. Both the theoretical and numerical results will be used in the project.

Thus, the main Project objectives consist in:

The detail investigation of the effects of a magnetic field on the one-dimensional decay instability (Raman-type instability) in homogeneous plasma using the full set of Maxwell equations in addition to the continuity and the relativistic electron momentum equations. The increasing of efficiency of the laser-plasma interaction under the conditions of double resonance must be taken into account [17,18].

In particular it includes:

  • solving theoretically the set of coupling equations giving an account of decay of the extraordinary wave into two extraordinary waves to obtain analytical expressions for both the growth rate and the threshold of the one-dimensional instability of a laser pulse propagating perpendicular to an external magnetic field;
  • production of special 2D relativistic PIC code to corroborate the hydrodynamic theory and to investigate the kinetic stage of instability that accompanies by the transformation of approximately 85% of the energy of the laser pulse into the energy of plasma electrons;
  • theoretical and numerical investigation of the physical mechanisms of plasma ions acceleration and heating by powerful laser pulse in the presence of an external magnetic field will be fulfilled (for the problems of inertial controlled nuclear fusion and/or the problems of particle acceleration in plasma). The focus is on plasma and laser parameters that are readily accessible experimentally, i.e. 1 MG < B < 100 MG, 1018 W/cm2 < I < 1021 W/cm2 and pulse duration 0.1 – 10 ps (Nevada Terawatt Facility at UNR).


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