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P: Fachverband Plasmaphysik

P 24: Laser Plasmas I

P 24.6: Vortrag

Donnerstag, 20. März 2014, 15:15–15:30, SPA HS202

Numerical simulation of an ensemble of radiating particles — •Christian Herzing, Nina Elkina, and Hartmut Ruhl — Ludwig-Maximilians Universität, München, 80539, Germany

We present a new code for the simulation of finite particle systems interacting with intense laser fields I≥10²⁰ W/cm². Our aim is to calculate time resolved spectra and to study coherency effects at high frequencies (ℏ ω ∼ 10 − 100 KeV). Under such conditions the radiation reaction effects can become substantial. In this work the radiation reaction is taken into account classically by adding the radiation friction term into the equation of particle motion. The inter-particle interactions are treated by means of the Lienard-Wiechert potentials. The set of covariant equations for the dynamics of an ensemble of particles in an arbitrary electromagnetic field is integrated by using an embedded Nyström method of the ordrer 5(6). The code is supplemented with an adaptive time stepping control, which considerably decreases the computational efforts. To prevent an numerical violation of the mass shell condition u_µu^µ=c² a projection onto this shell is applied to the 4-momenta. As a physical application of the newly developed code, we use it to study nonlinear Thompson scattering by a bunch of particles. Since we take inter-particle interactions into account, we can investigate the impact of the Coulomb explotion of the bunch to the scattering. Our results are important for designing high brilliant sources of high frequency radiation.