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Accurate knowledge of energy deposition of energetic ions and the resulting electron-ion energy partition in dense plasmas is of essential importance for understanding the hot-spot ignition and burning of inertial confinement fusion. In the present work, the energy deposition and the electron-ion energy partition of energetic ions are studied in a wide range of temperatures and densities based on the improved T-matrix model. Compared to the stopping power model based on the assumption of small -angle scattering, the improved T-matrix model can consistently take into account the large-angle Coulomb scattering and the resulting transversal deflection of the energetic ions. We investigate the influence of the effect of transversal deflection on the electron-ion energy partition, and propose a fitting formula for the electron energy partition factor, which is suitable for the application in inertial confinement fusion simulation. It is found that the amount of the relative amount of energy deposited into electrons in plasmas will be reduced at most about 27.5% by the effect of transversal deflection. This conclusion suggests that the transversal deflection of energetic ions, induced by the large-angle Coulomb scattering and its cumulative effect, has to be accounted for in accurately simulating the hot-spot ignition and burning of the fuel in inertial confinement fusion.
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Keywords:
- energy deposition /
- electron-ion energy partition /
- nonideal plasmas /
- inertial confinement fusion
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