EPJ Web of Conferences
Volume 59, 2013IFSA 2011 – Seventh International Conference on Inertial Fusion Sciences and Applications
|Number of page(s)||5|
|Section||V. Laser and Beam Plasma Interaction|
|Published online||15 November 2013|
Simulations of drastically reduced SBS with laser pulses composed of a Spike Train of Uneven Duration and Delay (STUD pulses)
1 Centre de Physique Théorique, CNRS, Ecole Polytechnique, Palaiseau, France
2 Polymath Research Inc., Pleasanton, CA, USA
a e-mail: email@example.com
Published online: 15 November 2013
By comparing the impact of established laser smoothing techniques like Random Phase Plates (RPP) and Smoothing by Spectral Dispersion (SSD) to the concept of “Spike Trains of Uneven Duration and Delay” (STUD pulses) on the amplification of parametric instabilities in laser-produced plasmas, we show with the help of numerical simulations, that STUD pulses can drastically reduce instability growth by orders of magnitude. The simulation results, obtained with the code Harmony in a nonuniformly flowing mm-size plasma for the Stimulated Brillouin Scattering (SBS) instability, show that the efficiency of the STUD pulse technique is due to the fact that successive re-amplification in space and time of parametrically excited plasma waves inside laser hot spots is minimized. An overall mean fluctuation level of ion acoustic waves at low amplitude is established because of the frequent change of the speckle pattern in successive spikes. This level stays orders of magnitude below the levels of ion acoustic waves excited in hot spots of RPP and SSD laser beams.
© Owned by the authors, published by EDP Sciences, 2013
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