Electric field dynamics and ion acceleration in the self-channeling of a superintense laser pulse
A. Macchi, F. Ceccherini, F. Cornolti, S. Kar, M. Borghesi
备注：
9 pages, 7 figures, final revised version, to appear on Plasma Phys. Contr. Fus., special issue on "Laser and Plasma Accelerators", scheduled for February, 2009
本文用一维静电有质动力学模型研究了相对论强度的激光脉冲在低密度等离子体中传播时产生电场和离子径向加速的动力学过程，该模型用于解释电场的实验测量[S. Kar等人，New J. Phys. *9*，402（2007）]。离子在空间上聚焦在电荷位移通道的边缘，导致流体动力学破裂，这又导致电子加热和电场中的“回波”效应。在通道的中心区域中的完全电子耗尽的开始导致到“库仑爆炸”制度的平滑过渡和离子加速的饱和。
英文摘要：
The dynamics of electric field generation and radial acceleration of ions by a laser pulse of relativistic intensity propagating in an underdense plasma has been investigated using an one-dimensional electrostatic, ponderomotive model developed to interpret experimental measurements of electric fields [S. Kar et al, New J. Phys. *9*, 402 (2007)]. Ions are spatially focused at the edge of the charge-displacement channel, leading to hydrodynamical breaking, which in turns causes the heating of electrons and an "echo" effect in the electric field. The onset of complete electron depletion in the central region of the channel leads to a smooth transition to a "Coulomb explosion" regime and a saturation of ion acceleration.
Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV elec-trons and gamma-rays
