TITLE

Laser plasma interaction studies in the context of shock ignition-Transition from collisional to collisionless absorption

AUTHOR(S)
Klimo, O.; Tikhonchuk, V. T.; Ribeyre, X.; Schurtz, G.; Riconda, C.; Weber, S.; Limpouch, J.
PUB. DATE
August 2011
SOURCE
Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p082709
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The shock ignition concept implies laser pulse intensities higher than 1015 W/cm2 (at the wavelength of 351 nm), which is the commonly accepted limit where the inverse bremsstruhlung absorption dominates. The transition from collisional to collisionless absorption in laser plasma interactions at higher intensities is studied in the present paper with the help of large scale one-dimensional particle-in-cell simulations. The initial parameters are defined by the hydrodynamic simulations corresponding to recent experiments. The simulations predict that a quasi-steady regime of laser plasma interaction is attained where the total laser energy absorption stays on the level of ∼65% in the laser intensity range 1015-1016 W/cm2. However, the relation between the collisional and collisionless processes changes significantly. This is manifested in the energy spectrum of electrons transporting the absorbed laser energy and in the spectrum of the reflected laser light.
ACCESSION #
65108122

 

Related Articles

  • Eu’s generalized hydrodynamics as the basis of a new computational model for rarefied and microscale gas dynamics. Myong, R. S. // AIP Conference Proceedings;2001, Vol. 585 Issue 1, p305 

    A new computational model based on Eu's generalized hydrodynamics, which has been recently proposed for describing the motion of gases in non-equilibrium state and is shown to be consistent with the second law of thermodynamics, is presented. The general understanding of Eu's generalized...

  • Fast-ignition transport studies: Realistic electron source, integrated particle-in-cell and hydrodynamic modeling, imposed magnetic fields. Strozzi, D. J.; Tabak, M.; Larson, D. J.; Divol, L.; Kemp, A. J.; Bellei, C.; Marinak, M. M.; Key, M. H. // Physics of Plasmas;Jul2012, Vol. 19 Issue 7, p072711 

    Transport modeling of idealized, cone-guided fast ignition targets indicates the severe challenge posed by fast-electron source divergence. The hybrid particle-in-cell (PIC) code Zuma is run in tandem with the radiation-hydrodynamics code Hydra to model fast-electron propagation, fuel heating,...

  • Temporally resolved characterization of shock-heated foam target with Al absorption spectroscopy for fast electron transport study. Yabuuchi, T.; Sawada, H.; Regan, S. P.; Anderson, K.; Wei, M. S.; Betti, R.; Hund, J.; Key, M. H.; Mackinnon, A. J.; McLean, H. S.; Paguio, R. R.; Patel, P. K.; Saito, K. M.; Stephens, R. B.; Wilks, S. C.; Beg, F. N. // Physics of Plasmas;Sep2012, Vol. 19 Issue 9, p092705 

    The CH foam plasma produced by a laser-driven shock wave has been characterized by a temporally resolved Al 1s-2p absorption spectroscopy technique. A 200 mg/cm3 foam target with Al dopant was developed for this experiment, which used an OMEGA EP [D. D. Meyerhofer et al., J. Phys.: Conf. Ser....

  • Measurements of colliding shock wave and supersonic gas flow. Kaganovich, D.; Helle, M. H.; Gordon, D. F.; Ting, A. // Applied Physics Letters;11/8/2010, Vol. 97 Issue 19, p191501 

    The collision between a laser generated shock wave and a supersonic flow from a gas jet was studied using pump-probe Schlieren shadowgraphy. The velocity of a gas escaping into vacuum from a high pressure gas jet nozzle was measured and verified in simulation. Time resolved tracking of the shock...

  • Comparisons of angularly and spectrally resolved Bremsstrahlung measurements to two-dimensional multi-stage simulations of short-pulse laser-plasma interactions. Chen, C. D.; Kemp, A. J.; Pérez, F.; Link, A.; Beg, F. N.; Chawla, S.; Key, M. H.; McLean, H.; Morace, A.; Ping, Y.; Sorokovikova, A.; Stephens, R. B.; Streeter, M.; Westover, B.; Patel, P. K. // Physics of Plasmas;May2013, Vol. 20 Issue 5, p052703 

    A 2-D multi-stage simulation model incorporating realistic laser conditions and a fully resolved electron distribution handoff has been developed and compared to angularly and spectrally resolved Bremsstrahlung measurements from high-Z planar targets. For near-normal incidence and 0.5-1 ×...

  • Laser pulses designed in time by adaptive hydrodynamic modeling for optimizing ultra-fast laser-metal interactions. Colombier, J.; Audouard, E.; Stoian, R. // Applied Physics A: Materials Science & Processing;Feb2013, Vol. 110 Issue 3, p723 

    Determining optimal temporal pulse shapes is an essential aspect for controlling the nature and the energetic characteristics of the ablation products following laser irradiation of materials on ultra-fast scales. In this respect, adaptive feedback loops based on temporal pulse manipulation have...

  • Species separation in inertial confinement fusion fuels. Bellei, C.; Amendt, P. A.; Wilks, S. C.; Haines, M. G.; Casey, D. T.; Li, C. K.; Petrasso, R.; Welch, D. R. // Physics of Plasmas;Jan2013, Vol. 20 Issue 1, p012701 

    It is shown by means of multi-fluid particle-in-cell simulations that convergence of the spherical shock wave that propagates through the inner gas of inertial confinement fusion-relevant experiments is accompanied by a separation of deuterium (D) and tritium (T) ions across the shock front....

  • Direct numerical simulation of impinging shock wave/turbulent boundary layer interaction at M=2.25. Pirozzoli, Sergio; Grasso, Francesco // Physics of Fluids;Jun2006, Vol. 18 Issue 6, p065113 

    The interaction of a spatially developing adiabatic boundary layer flow at M∞=2.25 and Reθ=3725 with an impinging oblique shock wave (β=33.2°) is analyzed by means of direct numerical simulation of the compressible Navier-Stokes equations. Under the selected flow conditions the...

  • Radiation hydrodynamics modeling of the highest compression inertial confinement fusion ignition experiment from the National Ignition Campaign. Clark, D. S.; Marinak, M. M.; Weber, C. R.; Eder, D. C.; Haan, S. W.; Hammel, B. A.; Hinkel, D. E.; Jones, O. S.; Milovich, J. L.; Patel, P. K.; Robey, H. F.; Salmonson, J. D.; Sepke, S. M.; Thomas, C. A. // Physics of Plasmas;2015, Vol. 22 Issue 2, p1 

    The recently completed National Ignition Campaign (NIC) on the National Ignition Facility (NIF) showed significant discrepancies between post-shot simulations of implosion performance and experimentally measured performance, particularly in thermonuclear yield. This discrepancy between...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics