THE EFFECT OF INDUCED SPATIAL INCOHERENCE ON THE ABSOLUTE RAMAN INSTABILITY

被引：11

作者：

GUZDAR, PN ^{[1
]}

TAN, W ^{[1
]}

LEE, YC ^{[1
]}

LIU, CS ^{[1
]}

LEHMBERG, RH ^{[1
]}

机构：

[1] USN,RES LAB,WASHINGTON,DC 20375

来源：

PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1991年 / 3卷 / 03期

关键词：

D O I：

10.1063/1.859873

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

A numerical and analytical study of the Raman instability in a homogeneous plasma is presented in which the pump has been modeled to include the effects of broad bandwidth and the induced spatial incoherence (ISI) method of beam smoothing. For a time-averaged homogeneous growth rate gammaBAR0 and a bandwidth sigma, there is a significant reduction in Raman backscattering when sigma greater-than-or-similar-to 2-gamma-0, for gammaBAR0(2) near threshold intensity. However, for gammaBAR0(2) very large compared to the threshold, neither ISI nor bandwidth affects Raman scattering.

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收藏

页码：776 / 780

页数：5

相关论文

共 10 条

[1]

BERGER RL, 1987, B AM PHYS SOC, V32, P1797

[2] PARAMETRIC-INSTABILITIES IN PRESENCE OF SPACE-TIME RANDOM FLUCTUATIONS [J].

LAVAL, G ;

PELLAT, R ;

PESME, D ;

RAMANI, A ;

ROSENBLUTH, MN ;

WILLIAMS, EA .

PHYSICS OF FLUIDS, 1977, 20 (12) :2049-2057

[3] THEORY OF INDUCED SPATIAL INCOHERENCE [J].

LEHMBERG, RH ;

SCHMITT, AJ ;

BODNER, SE .

JOURNAL OF APPLIED PHYSICS, 1987, 62 (07) :2680-2701

[4] USE OF INDUCED SPATIAL INCOHERENCE FOR UNIFORM ILLUMINATION OF LASER FUSION-TARGETS [J].

LEHMBERG, RH ;

OBENSCHAIN, SP .

OPTICS COMMUNICATIONS, 1983, 46 (01) :27-31

[5] BRILLOUIN-SCATTERING MEASUREMENTS FROM PLASMAS IRRADIATED WITH SPATIALLY AND TEMPORALLY INCOHERENT LASER-LIGHT [J].

MOSTOVYCH, AN ;

OBENSCHAIN, SP ;

GARDNER, JH ;

GRUN, J ;

KEARNEY, KJ ;

MANKA, CK ;

MCLEAN, EA ;

PAWLEY, CJ .

PHYSICAL REVIEW LETTERS, 1987, 59 (11) :1193-1196

[6] LASER-TARGET INTERACTION WITH INDUCED SPATIAL INCOHERENCE [J].

OBENSCHAIN, SP ;

GRUN, J ;

HERBST, MJ ;

KEARNEY, KJ ;

MANKA, CK ;

MCLEAN, EA ;

MOSTOVYCH, AN ;

STAMPER, JA ;

WHITLOCK, RR ;

BODNER, SE ;

GARDNER, JH ;

LEHMBERG, RH .

PHYSICAL REVIEW LETTERS, 1986, 56 (26) :2807-2810

[7] REDUCTION OF RAMAN-SCATTERING IN A PLASMA TO CONVECTIVE LEVELS USING INDUCED SPATIAL INCOHERENCE [J].

OBENSCHAIN, SP ;

PAWLEY, CJ ;

MOSTOVYCH, AN ;

STAMPER, JA ;

GARDNER, JH ;

SCHMITT, AJ ;

BODNER, SE .

PHYSICAL REVIEW LETTERS, 1989, 62 (07) :768-771

[8]

PEYSER T, UNPUB PHYS FLUIDS B

[9] EFFECTS OF FINITE-BANDWIDTH DRIVER ON PARAMETRIC-INSTABILITY [J].

THOMSON, JJ ;

KARUSH, JI .

PHYSICS OF FLUIDS, 1974, 17 (08) :1608-1613

[10] FINITE-BANDWIDTH EFFECTS ON PARAMETRIC-INSTABILITY IN AN INHOMOGENEOUS PLASMA [J].

THOMSON, JJ .

NUCLEAR FUSION, 1975, 15 (02) :237-247