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Hot Electron Generation by Self Focused Quadruple Gaussian Laser Beams During Inertial Confinement Fusion
Theoretical study on the generation of hot electrons by intense laser beams in hot dense plasmas during inertial confinement fusion (ICF) has been presented. In order to obtain uniform heating of the fuel pellet the irradiance over the beam cross-section has been modeled by Quadruple Gaussian (Q.G) prole. Effect of self-focusing of the laser beam on energy gained by the electrons has been investigated in detail. Following variational theory based on Lagrangian formulation and hydrodynamic fluid model of plasma coupled differential equations governing the evolution of beam width of the laser beam and energy of the generated hot electrons have been obtained. It has been observed that the uniformity of the irradiance over the beam cross-section enhances the energy of the hot electrons considerably.