Strong Langmuir turbulence excited by laser near critical surface
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摘要: 为了描绘出激光等离子体临界面处的强朗缪尔湍动,分析了激光等离子体中电磁波、朗缪尔波与离子声波的三波相互作用,采用二维三分量通过快速傅里叶变换方法数值求解萨哈罗夫方程。从图像中可看出,激光与等离子体的相互作用导致横波与朗缪尔波之间出现的能量均分现象和密度空穴。求出了强朗缪尔波的强度和密度空穴的尺度,结果与粒子模拟的预测结果及实验所测数据大致相符。结果表明,数值分析仍是探究强朗缪尔湍动真实物理图像的一个有效途径。Abstract: The collapse behavior of Langmuir waves excited by laser near critical surface is numerically studied.On the basis of Zakharov equations in frame of strong turbulence,it is shown that Langmuir waves excited by transverse pumping plasmons near critical surface may collapse,leading to the formation of density cavity due to ponderomotive force.The interaction will lead to tendency of an equilibration of energy over both of transverse and Langmuir plasmons with the same frequencies near ωp,which is agreement with our numerical analysis.The value of width of the density cavity estimated is similar to the experimental result.
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[1] LI X Q.Turbulent plasma physics[M].Beijing:Beijing Normal University Press,1987.133～140(in Chinese).
[2] Group of the Stratagem Research on the Development of Plasma Physics.Nuclear fusion and low-temperature plasma physics[M].Beijing:Science Press,2004.55～62(in Chinese).
[3] QIANG X W,TU Q F.Parameters analyzing on laser coupling with high Z materials[J].Laser Technology,2000,24(5):306～311(in Chinese).
[4] ROBINSON P A.Nonlinear wave collapse and strong turbulence[J].Revieus of Modern Physics,1997,69(2):507～573.
[5] ZAKHAROV V E.In handbook of plasma physics,collpse and self-focusing of Langmuir waves[M].Amsterdam:North-Holland Physics Publishing,1983.81～122.
[6] ZAKHAROV V E.Collapse of Langmuir waves[J].Soviet Physics Journal of Experimental and Theoretical Physics,1972,35:908.
[7] SHARMA R P,BATRA K,VERGA A D.Nonlinrea evolution of the modulational instability and chaos using one-dimensional Zakharov equations and a simplified model[J].Physics Plasmas,2005,12(2):022311-1.
[8] RRUSSELL D,DUBOIS D F,HARVEY A R.Collapsing-caviton turbulence in one dimension[J].Phys Rev Lett,1986,56(8):838～841.
[9] SANBONMATSU K Y,VU H X,DUBOIS D F et al.Quantitative comparison of reduced-description particle-in-cell and quasilinear-Zakharov models for parametrically excited Langmuir turbulence[J].Physics of Plasmas,2000,7(7):2824～2841.
[10] LI X Q.Collapsing dynamics of plasmons[M].Beijing:Beijing Science and Technology Press,2004.126～148(in Chinese).
[11] ZAKHAROV V E,MASTRIUKOV A F,SYNAKH V S.Dynamics of plasma-wave collapse in a hot plasma[J].Soviet Journal of Plasma Phsics,1975,11:339～343.
[12] GOLDMAN M V,REITER G F,NICKOLSON D R.Radiation from a strongly turbulent plasma:application to electron beam-excited solar emissions[J].Physics of Fluids,1980,23(2):388～401.
[13] NICKOLSON D R,GOLDMAN M V.Cascade and collapse of Langmuir waves in two dimensions[J].Physics of Fluids,1978,21(10):1766～1776.
[14] PELLETIER G.Generation of a high-energy electron tail by strong Langmuir turbulence in a plasma[J].Phys Rev Lett,1982,49(11):782～785.
[15] YONG P E,FOORD M E,HAMMER J H et al.Time-dependent channel formation in a laser-produced plasma[J].Phys Rev Lett,1995,76(6):1082～1085.
[16] YOUNG P E,BALDIS H A,JOHNSTON T W et al.Filamentation and second-harmonic emission in laser-plasma interactions[J].Phys Rev Lett,1989,63(26):2812～2815.
[17] LI X Q,MA Y H.Self-generated magnetic fields by transverse plasmon in celestial bodies[J].Astrnomy and Astrophysics,1993,270:534～542.
[18] RUBENCHIK A M,ZAKHAROV V E.Handbook of plasma physics,physics of laser plasmas[M].New York:Elsevier Science,1991.335～346.
[19] TSYTOVICH V N.Theory of turbulent plasma[M].New York:Consultants Bureau,1977.44.
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