Plasma expansion into a vacuum.
The charge separation effects in the collisionless plasma expansion into a vacuum are studied in great detail. Accurate results are obtained concerning the structure of the ion front, the resultant ion energy spectrum, and more specifically the maximum ion energy. These are of crucial importance for the interpretation of recent experiments, where high-energy ion jets were produced from short pulse interaction with solid targets.
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Centre de Physique Théorique (UMR 7644 du CNRS), Ecole Polytechnique, Palaiseau 91128 Cedex, France.