Competition between stimulated Raman scattering and two-plasmon decay in   inhomogeneous plasma

doi:10.1063/1.4941969

CORC > 北京大学 > 工学院

	Competition between stimulated Raman scattering and two-plasmon decay in inhomogeneous plasma
	Xiao, C. Z. ; Liu, Z. J. ; Zheng, C. Y. ; He, X. T.
刊名	PHYSICS OF PLASMAS
	2016
关键词	INERTIAL CONFINEMENT FUSION PARAMETRIC-INSTABILITIES ELECTROMAGNETIC-WAVES TEMPERATURE BACKSCATTER IGNITION
DOI	10.1063/1.4941969
英文摘要	We demonstrate competitions between stimulated Raman scattering (SRS) and two-plasmon decay (TPD) in the laser polarization plane in inhomogeneous near quarter-critical density plasma by using linear convective gain analysis and two-dimensional (2D) particle-in-cell (PIC) simulations. Linear theoretical analysis implies that convective SRS occurs in a wider and lower density region than absolute SRS and has a shared occurrence region with convective TPD. This convective SRS prefers a parameter space with the laser intensity larger than the order of 10(15)W/cm(2) and the density scale length about several hundreds microns, which may be common in large scale direct-drive scheme, shock ignition scheme, and hybrid-drive scheme. A convective nature and saturation mechanism under these parameter regions are identified to be Langmuir decay instability and strong pump depletion. The significance of this convective SRS is shown in our 2D PIC simulations that hot electrons are reduced through suppressing the electron staged acceleration by TPD in the lower density region due to its high phase velocity. Temperature induced competitions are also studied using a relativistic modification to the Langmuir wave dispersion relation when T-e > 5 keV. Both absolute and convective SRS are observed to be dominant in the simulations when the temperature is as high as 10 keV. (C) 2016 AIP Publishing LLC.; National Natural Science Foundation of China [11575035, 11175029, 11475030, 11175030]; National Basic Research Program of China [2013CB834101]; SCI(E); EI; ARTICLE; zheng_chunyang@iapcm.ac.cn; 2; 23
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437730]
专题	工学院
推荐引用方式 GB/T 7714	Xiao, C. Z.,Liu, Z. J.,Zheng, C. Y.,et al. Competition between stimulated Raman scattering and two-plasmon decay in inhomogeneous plasma[J]. PHYSICS OF PLASMAS,2016.
APA	Xiao, C. Z.,Liu, Z. J.,Zheng, C. Y.,&He, X. T..(2016).Competition between stimulated Raman scattering and two-plasmon decay in inhomogeneous plasma.PHYSICS OF PLASMAS.
MLA	Xiao, C. Z.,et al."Competition between stimulated Raman scattering and two-plasmon decay in inhomogeneous plasma".PHYSICS OF PLASMAS (2016).