Electron Acceleration by Beating of Two Intense Cross-Focused Hollow Gaussian Laser Beams in Plasma  

作　　者：Saleh T. Mahmoud Rakhi Gauniyal Nafis Ahmad Priyanka Rawat Gunjan Purohit 

机构地区：[1]Department of Physics, College of Science, UAE University [2]Laser Plasma Computational Laboratory, Department of Physics, DAV (PG) College

出　　处：《Communications in Theoretical Physics》2018年第1期86-94,共9页理论物理通讯（英文版）

基　　金：Supported by United Arab Emirates University for Financial under Grant No.UPAR(2014)-31S164

摘　　要：This paper presents propagation of two cross-focused intense hollow Gaussian laser beams(HGBs) in collisionless plasma and its effect on the generation of electron plasma wave(EPW) and electron acceleration process,when relativistic and ponderomotive nonlinearities are simultaneously operative. Nonlinear differential equations have been set up for beamwidth of laser beams, power of generated EPW, and energy gain by electrons using WKB and paraxial approximations. Numerical simulations have been carried out to investigate the effect of typical laser-plasma parameters on the focusing of laser beams in plasmas and further its effect on power of excited EPW and acceleration of electrons. It is observed that focusing of two laser beams in plasma increases for higher order of hollow Gaussian beams,which significantly enhanced the power of generated EPW and energy gain. The amplitude of EPW and energy gain by electrons is found to enhance with an increase in the intensity of laser beams and plasma density. This study will be useful to plasma beat wave accelerator and in other applications requiring multiple laser beams.

关 键 词：hollow Gaussian beams （HGBs） collisionless plasma cross-focusing electron plasma wave particle acceleration 

分 类 号：O53[理学—等离子体物理]