Bonn 2000 – wissenschaftliches Programm

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P: Plasmaphysik

P 1: Theorie/Dichte Plasmen I

P 1.6: Vortrag

Montag, 3. April 2000, 18:00–18:15, HS III

3D simulations of femtosecond laser-solid interactions with Smoothed Particle Kinetics — •Paul Gibbon and Christian Reich — Institut für Optik und Quantenoptik, Abt. Röntgenoptik, Friedrich-Schiller-Universität Jena

Kinetic modelling of ultra-high intensity, femtosecond laser interactions with plasmas is traditionally carried out using particle-in-cell (PIC) [1] or Vlasov simulation [2]. However, at near-solid densities, these methods are seriously limited by two factors: i) the need to resolve the Debye length on a spatial grid, and ii) approximations made in the treatment of collisions. A new method is presented here – Smoothed Particle Kinetics (SPK) – which overcomes these deficiencies by using a fast, 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 to laser-plasma interactions. Tests with this new code are presented, together with preliminary results 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)