Journal
LASER AND PARTICLE BEAMS
Volume 22, Issue 2, Pages 175-181Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0263034604222133
Keywords
ion acceleration; laser-plasma interaction; relativistic effects
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We consider ion acceleration at the front surface of overdense plasma by a short laser pulse. In this configuration, the laser ponderomotive pressure pushes the background electrons, and a double layer is produced at the boundary of the overdense region. The ions are accelerated by the electrostatic field of the double layer. If the laser intensity is so large that the plasma becomes relativistically transparent, then ion trapping in the running double layer and acceleration to relativistic energies is possible. We study this physics using one-dimensional particle-in-cell simulations. Ion acceleration in one- and two-component plasmas is considered. It is shown that the proton acceleration is more effective when they represent only a small dope to the heavy background ions.
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