The Study of Scattering and Transport of Electron Beam Into Dense Fuel for Fast-Shock Ignition Approach

The stopping power, penetration and scattering of high energy electrons with different energy distribution functions into dense fuel and hot-spot (fuel core) have been considered for a fast-shock ignition scenario. The analytical calculations indicate that fast electrons with two-temperature energy distribution function penetrate more into the dense fuel, in comparison with the monoenergetic and exponential function, where it is consistent with the MCNPX simulation results. Furthermore, the scattering of energetic electron beams toward the outer surface of the fuel for five various fuel density and two fast ignitor wavelengths of 0.53 and 0.35 micron have been investigated. The results show that for the fuel mass smaller than  2 mg, the scattering of electrons reduce for the electrons with smaller energies and fast ignitor of smaller  wavelengths. Meanwhile, for the electrons with energy of the order ~3.5 MeV, two-temperature and monoenergetic energy distribution function deliver the highest and lowest energy to the main fuel and the central hot-spot, respectively.