Stuttgart 2012 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Poster: Theorie/Modellierung
P 15.12: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.III
Coulomb explosion of uniformly charged spheroids — •Pierfrancesco Di Cintio1, Mickael Grech1, Rachel Nuter2, Alexey Mikaberidze1, Laurent Gremillet2, Eric Lefebvre2, Ulf Saalmann1, Jan Michael Rost1, and Stefan Skupin1,3 — 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany — 2CEA, DAM, DIF, F-91297 Arpajon, France — 3Friedrich Schiller University, Institute of Condensed Matter Theory and Solid State Optics, D-07743 Jena, Germany
We propose a semi-analytical model for non-relativistic Coulomb explosion of a uniformly charged spheroid. The model allows to derive the time-dependent particle energy distributions. Simple expressions are given for the characteristic explosion time and maximum particle energies in the limits of extreme prolate and oblate spheroids as well as for the sphere. Our theoretical predictions are found to be in good agreement with particle (both molecular-dynamics and particle-in-cell) simulations. Our results may give simple design guidelines how to optimize target properties; for example, for inertial fusion applications or for ion acceleration from laser-solid interaction characterized by the emission of short, compact, and highly-charged ion bunches. Propagation of these bunches is strongly affected by space charge effects. By approximating the accelerated ion bunches as uniformly charged spheroids, the results presented here allows to derive the conditions required for limited energy and angular dispersions.