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  • Shock Ignition is considered as a relatively robust and efficient approach to inertial confinement fusion. A strong converging shock, which is used to ignite the fuel, is launched by a high power laser pulse with intensity in the range of 1015 - 1016 W/cm2 (at the wavelength of 351 nm). In the lower end of this intensity range the interaction is dominated by collisions while the parametric instabilities are playing a secondary role. This is manifested in a relatively weak reflectivity and efficient electron heating. The interaction is dominated by collective effects at the upper edge of the intensity range. The stimulated Brillouin and Raman scattering (SBS and SRS respectively) take place in a less dense plasma and cavitation provides an efficient collisionless absorption mechanism. The transition from collisional to collisionless absorption in laser plasma interactions at higher intensities is studied here with the help of large scale one-dimensional Particle-in-Cell (PIC) simulations. The relation between the collisional and collisionless processes is manifested in the energy spectrum of electrons transporting the absorbed laser energy and in the spectrum of the reflected laser light.
  • Shock Ignition is considered as a relatively robust and efficient approach to inertial confinement fusion. A strong converging shock, which is used to ignite the fuel, is launched by a high power laser pulse with intensity in the range of 1015 - 1016 W/cm2 (at the wavelength of 351 nm). In the lower end of this intensity range the interaction is dominated by collisions while the parametric instabilities are playing a secondary role. This is manifested in a relatively weak reflectivity and efficient electron heating. The interaction is dominated by collective effects at the upper edge of the intensity range. The stimulated Brillouin and Raman scattering (SBS and SRS respectively) take place in a less dense plasma and cavitation provides an efficient collisionless absorption mechanism. The transition from collisional to collisionless absorption in laser plasma interactions at higher intensities is studied here with the help of large scale one-dimensional Particle-in-Cell (PIC) simulations. The relation between the collisional and collisionless processes is manifested in the energy spectrum of electrons transporting the absorbed laser energy and in the spectrum of the reflected laser light. (en)
Title
  • Laser plasma physics in shock ignition - Transition from collisional to collisionless absorption
  • Laser plasma physics in shock ignition - Transition from collisional to collisionless absorption (en)
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  • Laser plasma physics in shock ignition - Transition from collisional to collisionless absorption
  • Laser plasma physics in shock ignition - Transition from collisional to collisionless absorption (en)
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  • RIV/68407700:21340/13:00213889!RIV14-MSM-21340___
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  • P(GPP205/11/P660), P(LC528), Z(MSM6840770022)
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  • 84346
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  • RIV/68407700:21340/13:00213889
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  • laser plasma interaction; stimulated Raman scattering; stimulated Brillouin scattering; inverse bremsstrahlung (en)
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  • [977EF6044D7F]
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  • Bordeaux
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  • Les Ulis
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  • IFSA 2011 - Seventh International Conference on Inertial Fusion Sciences and Applications
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  • Klimo, Ondřej
  • Limpouch, Jiří
  • Tikhonchuk, V. T.
  • Ribeyre, X.
  • Riconda, C.
  • Schurtz, G.
  • Weber, S.
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issn
  • 2101-6275
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  • 10.1051/epjconf/20135905008
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  • EDP Sciences
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  • 978-2-7598-1077-2
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  • 21340
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