J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 549-551
Control of proton beam divergence in intense-laser foil-plasma interactionS. Kawata, R. Sonobe, S. Miyazaki, K. Sakai and T. Kikuchi
Graduate School of Engineering, Utsunomiya University, 7-1-2 Yohtoh, Utsunomiya 321-8585, Japan
Quality of an ion beam is one of the critical factors in intense-laser ion beam generation. A purpose of this study is suppression of transverse proton divergence by a controlled electron cloud in laser-foil interactions. In this study, the foil target has a hole at the opposite side of the laser illumination. The electrons accelerated by an intense laser are limited in transverse by a neutral plasma at a protuberant part. Therefore the protons are accelerated and also controlled transversely by the electron cloud structure. In our 2.5-dimensional Particle-in-Cell simulations we demonstrate that the transverse shape of the electron cloud is well controlled and the collimated proton beam is generated successfully in the target with the hole.
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