Topic/Type: 2.3 Hybrid methods, including PIC/DSMC and PIC/Fluid, Poster

Comparison of radiaton cooling models for particle-in-cell simulations

M. Vranic, J. L. Martins, L. O. Silva

GoLP/IPFN, Instituto Superior T?cnico, Lisboa, Portugal

Under extreme acceleration, charged particles can radiate strongly and the corresponding radiation damping/cooling can become important in the plasma energetics and dynamics. In particular, under the presence of ultra high intensity lasers or other intense electro/magnetic fields the motion of particles in the ultrarelativistic regime can be severely limited by radiation damping. The standard Particle-in-Cell (PIC) algorithms do not include radiation damping/cooling effects. Even though this is a well know mechanism, there is not yet a definite algorithm nor a standard technique to include radiation cooling in PIC codes. We have compared several models for the calculation of radiation damping force, with the goal of developing an algorithm for radiation damping in Osiris [1]. We evaluate both the general numerical issues as well as the numerical implementation in the PIC algorithm. The results of the different models are compared with analytical models and standard results, and the relevance/advantages of each model are discussed.

[1] R. A. Fonseca et al. Lect Notes Comput Sc (2002) vol. 2331 pp. 342-351

Work partially supported by FCT (Portugal).