Growth of stimulated Raman instability by a density-modulated electron beam in laser-plasma interactions  

作　　者：Pinki Yadav Devki Nandan Gupta Jyotsna Sharma 

机构地区：[1]Department of Physics and Astrophysics,University of Delhi,Delhi 110007,India [2]Department of Physics,South Asian University,New Delhi 110068,India [3]Department of Physics,Motilal Nehru College,Univeristy of Delhi,Delhi 110021,India

出　　处：《Communications in Theoretical Physics》2025年第1期164-171,共8页理论物理通讯(英文版)

基　　金：financially supported by the Science and Engineering Research Board,Government of India(Grant No.CRG/2022/001989)。

摘　　要：A way to enhance the growth of stimulated Raman instability in laser-plasma interactions was investigated.This relies on the application of density modulation of a co-propagating electron beam in plasmas.In the stimulated Raman scattering process,an electromagnetic pump wave decays into a low-frequency wave and a scattered electromagnetic sideband wave.In this process,the pump wave produces an oscillatory velocity associated with the plasma electrons and the beam electrons.These oscillatory velocities combine with the existing low-frequency mode,producing ponderomotive force that drives high-frequency sideband waves.The sidebands couple to the pump wave,driving the beam-mode.A modulation of the electron beam density enhances the growth rate of the instability.The theoretical calculations show about 40%enhancements in growth of Raman instability at resonance(where the electron beam density modulation parameter approaches to unity)for the plasma density of the order of 10^(18)cm^(-3).

关 键 词：Raman instability fluid dynamics plasma fusion 

分 类 号：O53[理学—等离子体物理]