Three-dimensional particle-in-cell simulations of laser channeling in fast ignition

Three-dimensional particle-in-cell simulations with an underdense plasma length up to 540 mu m are presented to show that laser channeling in 3D is qualitatively similar to that shown in previous 2D simulations [Li et al., Phys. Rev. Lett. 100, 125002 (2008)], but quantitative differences exist. Due to a larger laser ponderomotive force resulting from self-focusing and easier channel formation in 3D, the channeling speed in 3D is larger compared to 2D. Laser hosing and channel bending are also observed in 3D. Decoupling of the laser and plasma is observed when the electrons are heated to relativistic temperatures during the channeling process. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3574899]