Filip C V, Narang R, Tochitsky S Ya, Clayton C E, Musumeci P, Yoder R B, Marsh K A, Rosenzweig J B, Pellegrini C, Joshi C
Neptune Laboratory, Department of Electrical Engineering, University of California-Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Feb;69(2 Pt 2):026404. doi: 10.1103/PhysRevE.69.026404. Epub 2004 Feb 17.
The nonresonant beat-wave excitation of relativistic plasma waves is studied in two-dimensional simulations and experiments. It is shown through simulations that, as opposed to the resonant case, the accelerating electric fields associated with the nonresonant plasmons are always in phase with the beat-pattern of the laser pulse. The excitation of such nonresonant relativistic plasma waves is shown to be possible for plasma densities as high as 14 times the resonant density. The density fluctuations and the fields associated with these waves have significant magnitudes, facts confirmed experimentally using collinear Thomson scattering and electron injection, respectively. The applicability of these results towards eventual phase-locked acceleration of prebunched and externally injected electrons is discussed.
在二维模拟和实验中研究了相对论性等离子体波的非共振拍波激发。通过模拟表明，与共振情况相反，与非共振等离子体激元相关的加速电场总是与激光脉冲的拍频模式同相。对于高达共振密度14倍的等离子体密度，这种非共振相对论性等离子体波的激发被证明是可能的。分别使用共线汤姆逊散射和电子注入实验证实，与这些波相关的密度涨落和场具有显著的幅度。讨论了这些结果对预聚束和外部注入电子最终锁相加速的适用性。
