Heidelberg 1999 – wissenschaftliches Programm

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P: Plasmaphysik

P 17: Dichte Plasmen IV

P 17.1: Fachvortrag

Freitag, 19. März 1999, 11:45–12:15, CH 2

3D Smoothed-Particle-Kinetics simulations of femtosecond laser-solid interactions — •Paul Gibbon — Institut für Optik und Quantenoptik, Abteilung Röntgenoptik, Friedrich-Schiller-Universität Jena

Modelling the interaction of high intensity, femtosecond laser pulses with solid density plasmas is best carried out using a kinetic approach such as particle-in-cell (PIC) [1] or Vlasov simulation [2]. However, these methods are restricted in the range of parameters which can be studied by essentially two factors: i) the need to resolve the Debye length on the spatial grid, and ii) the approximations made in the treatment of collisions. A new method is presented here – Smoothed Particle Kinetics (SPK) – which overcomes these limitations by using a gridless N-body approach for computing the internal particle forces. The SPK method combines an electrostatic tree code [3] with finite-size particles and a quasi-periodic geometry suited for laser-plasma interactions. Examples are shown of three-dimensional hole-punching in thin foils and electron transport in dense targets, which demonstrate the potential of this technique for tackling hitherto inaccessible problems in plasma physics.

[1] A. Pukhov, J. Meyer-ter-Vehn, Phys. Rev. Lett.79, 2686 (1997)

[2] H. Ruhl, P. Mulser, Phys. Lett. A 205, 288 (1995)

[3] S. Pfalzner, P. Gibbon, Many Body Tree Methods in Physics, (Cambridge University Press, 1996)