Measurements of thermal transport in plasmas produced by picosecond laser pulses

In this paper we present measurements of energy transport in hot, high-density plasmas produced by picosecond laser interaction with solid targets. The propagation of the ablative heat wave was studied by using X-ray-ultraviolet (XUV) spectroscopy with picosecond temporal resolution. Measurements show that for laser intensities on target above 10 16 W/cm 2 , strong inhibition of heat flux toward the cold target occurs. A detailed modelling of the experimental data is presented in which heat transport and absorption processes are taken into account self-consistently. Finally the role played by lateral transport and self-induced magnetic fields in our experiment is also discussed.

[1]  B. MacGowan,et al.  The evolution of two-dimensional effects in fast-electron transport from high-intensity laser-plasma interactions , 1982 .

[2]  M. H. Key,et al.  The Physics of Laser Plasma Interactions , 1989 .

[3]  M. Haines Magnetic-field generation in laser fusion and hot-electron transport , 1986 .

[4]  J. A. Stamper,et al.  Faraday rotation measurements of megagauss magnetic fields in laser-produced plasmas. Final report , 1975 .

[5]  Jie Zhang,et al.  Energy transport in plasmas produced by a high brightness krypton fluoride laser focused to a line , 1994 .

[6]  Patrick Chassaing,et al.  Prediction of large‐scale transition features in the wake of a circular cylinder , 1990 .

[7]  K. V. Roberts,et al.  MEDUSA a one-dimensional laser fusion code , 1984 .

[8]  J. Meyer-ter-Vehn,et al.  On the penetration of an ablative heat wave into a solid wall , 1984 .

[9]  Bell,et al.  2D Fokker-Planck simulations of short-pulse laser-plasma interactions. , 1989, Physical review letters.

[10]  L. Spitzer,et al.  TRANSPORT PHENOMENA IN A COMPLETELY IONIZED GAS , 1953 .

[11]  J. Stamper Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements , 1991 .

[12]  A. Bruce Langdon,et al.  Nonlinear Inverse Bremsstrahlung and Heated-Electron Distributions , 1980 .

[13]  T. Harada,et al.  Development of a flat-field grazing-incidence XUV spectrometer and its application in picosecond XUV spectroscopy. , 1984, Applied optics.

[14]  J. D. Kilkenny,et al.  A study of ablation by laser irradiation of plane targets at wavelengths 1.05, 0.53, and 0.35 μm , 1983 .

[15]  Viana,et al.  Absorption of high-contrast 12-ps uv laser pulses by solid targets. , 1993, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[16]  R. Sigel,et al.  Angle-Dependent Reflectance of Laser-Produced Plasmas , 1977 .

[17]  M. Rosen Plasma physics issues in laboratory x‐ray lasers , 1990 .

[18]  Roger W. Falcone,et al.  Generation of efficient ultrafast laser‐plasma x‐ray sources , 1991 .