Laser Hole Boring into Overdense Plasma and Relativistic Electron Currents for Fast Ignition of ICF Targets

摘要: Laser hole boring and relativistic electron transport into plasma of 10 times critical density is studied by means 2D particle-in-cell simulation. At intensities ${I}_{0}{\ensuremath{\lambda}}^{2}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}10}^{20}\mathrm{W}{\mathrm{cm}}^{\ensuremath{-}2}\ensuremath{\mu}{\mathrm{m}}^{2}$, a channel $12\ensuremath{\lambda}$ deep $3\ensuremath{\lambda}$ in diameter has formed after 200 laser cycles. The driven current carries up to 40% the incident power. When penetrating overdense region, it breaks several filaments at early times, but channeled single magnetized jet later on. These features are essential for fast ignition targets inertial confinement fusion (ICF).