Recent Trident single hot spot experiments: Evidence for kinetic effects, and observation of Langmuir decay instability cascade

Single hot spot experiments offer several unique opportunities for developing a quantitative understanding of laser-plasma instabilities. These include the ability to perform direct numerical simulations of the experiment due to the finite interaction volume, isolation of instabilities due to the nearly ideal laser intensity distribution, and observation of fine structure due to the homogeneous plasma initial conditions. Experiments performed at Trident in the single hot spot regime have focused on the following issues. First, the intensity scaling of stimulated Raman scattering (SRS) for classically large damping regimes (kλD=0.35) was examined, and compared to classical SRS theory. SRS onset was observed at intensities much lower than expected (2×1015 W/cm2), from which nonclassical damping is inferred. Second, Thomson scattering was used to probe plasma waves driven by SRS, and structure was observed in the scattered spectra consistent with multiple steps of the Langmuir decay instability. Finally, sca...

[1]  R. Johnson,et al.  Trident: a versatile high-power Nd:glass laser facility for inertial confinement fusion experiments. , 1995, Applied optics.

[2]  D. Russell,et al.  Observation of stimulated electron-acoustic-wave scattering. , 2001, Physical review letters.

[3]  H. Pécseli,et al.  Formation and Coalescence of Electron Solitary Holes , 1979 .

[4]  J. Moody,et al.  Imaging backscattered and near to backscattered light in ignition scale plasmas (invited) , 1997 .

[5]  R. Berger,et al.  Effect of plasma noise spectrum on stimulated scattering in inhomogeneous plasma , 1989 .

[6]  J. Lindl.  Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain , 1995 .

[7]  M. Lopez,et al.  The spatial location of laser-driven, forward-propagating waves in a National-Ignition-Facility-relevant plasma , 2000 .

[8]  T. M. O'Neil,et al.  The Collisionless Damping of Nonlinear Plasma Oscillations. , 1965 .

[9]  H. Vu.  Three-dimensional particle-in-cell simulations of ion-driven parametric instabilities , 1997 .

[10]  Fuchs,et al.  First observation of ion acoustic waves produced by the langmuir decay instability , 2000, Physical review letters.

[11]  D. Montgomery.  Comment on "First observation of ion acoustic waves produced by the Langmuir decay instability". , 2001, Physical review letters.

[12]  H. Schamel.  Hole equilibria in Vlasov–Poisson systems: A challenge to wave theories of ideal plasmas , 2000 .

[13]  Robert L. Tokar,et al.  The electron‐acoustic mode , 1985 .

[14]  Jovanovic,et al.  Nonlinear model for coherent electric field structures in the magnetosphere , 2000, Physical review letters.

[15]  H. Rose,et al.  Characterization of plasma and laser conditions for single hot spot experiments , 1999 .

[16]  D. Dubois,et al.  Transient enhancement and detuning of laser-driven parametric instabilities by particle trapping. , 2001, Physical review letters.

[17]  Rose,et al.  Laser hot spots and the breakdown of linear instability theory with application to stimulated Brillouin scattering. , 1994, Physical review letters.

[18]  J. Moody,et al.  Evidence of plasma fluctuations and their effect on the growth of stimulated Brillouin and stimulated Raman scattering in laser plasmas , 1998 .

[19]  James F. Drake,et al.  Parametric Instabilities of Electromagnetic Waves in Plasmas , 1974 .

[20]  M. Goldman,et al.  Parametrically Excited Plasma Fluctuations , 1967 .

[21]  C. Labaune,et al.  Time-resolved measurements of secondary Langmuir waves produced by the Langmuir decay instability in a laser-produced plasma , 1998 .

[22]  John Sheffield,et al.  Plasma Scattering of Electromagnetic Radiation , 1975 .

[23]  H. Schamel.  Phase space vortices in unbunched beams in synchrotrons , 1998 .

[24]  J. Moody,et al.  Effects of laser beam smoothing on stimulated Raman scattering in exploding foil plasmas , 1996 .

[25]  Baker,et al.  Detection of ion plasma waves by collective Thomson scattering. , 1995, Physical review letters.

[26]  Rose,et al.  Flow-induced beam steering in a single laser hot spot , 2000, Physical review letters.

[27]  Juan C Fernández,et al.  Observed insensitivity of stimulated Raman scattering on electron density , 2000 .

[28]  S. Depierreux,et al.  Pesme et al. Reply , 2001 .

[29]  Reply: Pesme et al. , 2001 .

[30]  D. F. DuBois,et al.  Nonlinear saturation of stimulated Raman scattering in laser hot spots , 1999 .

[31]  M. Kruskal,et al.  Exact Nonlinear Plasma Oscillations , 1957 .

[32]  D. Russell,et al.  A self-consistent trapping model of driven electron plasma waves and limits on stimulated Raman scatter , 2001 .

[33]  Bedros Afeyan,et al.  Kinetic Theory of Electron-Plasma and Ion-Acoustic Waves in Nonuniformly Heated Laser Plasmas , 1998 .

[34]  Baker,et al.  Thomson Scattering Measurements of the Langmuir Wave Spectra Resulting from Stimulated Raman Scattering. , 1996, Physical Review Letters.

[35]  J. Holloway,et al.  Undamped longitudinal plasma waves , 1989 .

[36]  Rose,et al.  Saturation of stimulated Raman scattering by the excitation of strong Langmuir turbulence. , 1993, Physical review letters.

[37]  C. Franck,et al.  Dynamics of Periodic Ion Holes in a Forced Beam-Plasma Experiment , 2001 .