INDUCED SPATIAL INCOHERENCE EFFECTS ON THE CONVECTIVE RAMAN INSTABILITY

被引：16

作者：

GUZDAR, PN ^{[1
]}

LIU, CS ^{[1
]}

LEHMBERG, RH ^{[1
]}

机构：

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

来源：

PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1993年 / 5卷 / 03期

关键词：

D O I：

10.1063/1.860941

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：

The effect of the induced spatial incoherence method of laser beam smoothing on the convective Raman instability in an underdense inhomogeneous plasma has been studied. It is found that only for bandwidths comparable to, or greater than, the time-averaged homogeneous growth rate, is there significant smoothing effect resulting in a reduction of the backscattered radiation. However, for narrow bandwidths the backscattered radiation computed in the presence of hot spots created by the echelons, turns out to be significantly less than the levels observed in the Naval Research Laboratory experiments. We argue that a combination of three-dimensional effects and filamentation may account for the observed level of enhanced scattering.

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收藏

页码：910 / 919

页数：10

相关论文

共 23 条

[1] EVIDENCE OF STIMULATED RAMAN-SCATTERING OCCURRING IN LASER FILAMENTS IN LONG-SCALE-LENGTH PLASMAS [J].

AFSHARRAD, T ;

COE, SE ;

WILLI, O ;

DESSELBERGER, M .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1992, 4 (05) :1301-1322

[2] SUPPRESSION OF PARAMETRIC-INSTABILITY BY WEAKLY INCOHERENT LASER-BEAMS [J].

BERGER, RL .

PHYSICAL REVIEW LETTERS, 1990, 65 (10) :1207-1210

[3] BACKSCATTERED SPECTRA FOR STIMULATED RAMAN-SCATTERING IN AN INHOMOGENEOUS-PLASMA [J].

BONNAUD, G ;

PESME, D ;

PELLAT, R .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1992, 4 (02) :423-431

[4] SUPPRESSION OF INSTABILITIES IN A LONG-SCALELENGTH PREFORMED PLASMA [J].

COE, SE ;

AFSHARRAD, T ;

DESSELBERGER, M ;

KHATTAK, F ;

WILLI, O ;

GIULIETTI, A ;

LIN, ZQ ;

YU, W ;

DANSON, C .

EUROPHYSICS LETTERS, 1989, 10 (01) :31-36

[5] MEASUREMENT OF THE RAYLEIGH-TAYLOR INSTABILITY IN TARGETS DRIVEN BY OPTICALLY SMOOTHED LASER-BEAMS [J].

DESSELBERGER, M ;

WILLI, O ;

SAVAGE, M ;

LAMB, MJ .

PHYSICAL REVIEW LETTERS, 1990, 65 (24) :2997-3000

[6] EVIDENCE THAT STIMULATED RAMAN-SCATTERING IN LASER-PRODUCED PLASMAS IS AN ABSOLUTE INSTABILITY [J].

DRAKE, RP ;

WILLIAMS, EA ;

YOUNG, PE ;

ESTABROOK, K ;

KRUER, WL ;

BALDIS, HA ;

JOHNSTON, TW .

PHYSICAL REVIEW LETTERS, 1988, 60 (11) :1018-1021

[7] HYDRODYNAMIC TARGET RESPONSE TO AN INDUCED SPATIAL INCOHERENCE-SMOOTHED LASER-BEAM [J].

EMERY, MH ;

GARDNER, JH ;

LEHMBERG, RH ;

OBENSCHAIN, SP .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1991, 3 (09) :2640-2651

[8] RAYLEIGH-TAYLOR INSTABILITY GROWTH-RATES IN TARGETS ACCELERATED WITH A LASER-BEAM SMOOTHED BY INDUCED SPATIAL INCOHERENCE [J].

GRUN, J ;

EMERY, ME ;

MANKA, CK ;

LEE, TN ;

MCLEAN, EA ;

MOSTOVYCH, A ;

STAMPER, J ;

BODNER, S ;

OBENSCHAIN, SP ;

RIPIN, BH .

PHYSICAL REVIEW LETTERS, 1987, 58 (25) :2672-2675

[9] THE EFFECT OF BANDWIDTH ON THE CONVECTIVE RAMAN INSTABILITY IN INHOMOGENEOUS PLASMAS [J].

GUZDAR, PN ;

LIU, CS ;

LEHMBERG, RH .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1991, 3 (10) :2882-2888

[10] THE EFFECT OF INDUCED SPATIAL INCOHERENCE ON THE ABSOLUTE RAMAN INSTABILITY [J].

GUZDAR, PN ;

TAN, W ;

LEE, YC ;

LIU, CS ;

LEHMBERG, RH .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1991, 3 (03) :776-780