Particle-in-Cell Simulation of Laser Plasma Interactions in Multiple Speckles with Temporal Bandwidth

POSTER

Abstract

The widely used laser-smoothing techniques introduce small-scale structures (speckles) with higher-than-average intensities. The stimulated Raman scattering (SRS) instability is more likely to growth in the intense speckles. On the other hand, if the temporal bandwidth of the laser is comparable to the growth rate of SRS, the SRS may be reduced. To study the interaction of SRS and time-varying laser speckles in kinetic regimes, a general laser antenna has been implemented in particle-in-cell (PIC) code OSIRIS. This antenna is capable of modeling smoothing by spectral dispersion~(SSD), induced spatial incoherence~(ISI), and spike train of uneven duration and delay (STUD) pulse. Preliminary results of SRS affected by different laser-smoothing techniques are discussed. This Work is supported by NSF and DOE.

Authors

  • Han Wen

    • Univ of California - Los Angeles

  • Benjamin Winjum

    • Univ of California - Los Angeles
    • UCLA

  • Frank Tsung

    • Univ of California - Los Angeles
    • University of California, Los Angeles

  • Kyle Miller

    • Univ of California - Los Angeles

  • Adam Tableman

    • Univ of California - Los Angeles
    • UCLA Department of Physics and Astronomy

  • Warren Mori

    • Univ of California - Los Angeles
    • UCLA
    • Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California, USA
    • UCLA, Department of Physics and Astronomy, Los Angeles, CA, USA