Laser-accelerated ion sources have exceptional properties and could stimulate development of compact ion accelerators. For many applications beam control is an essential requirement. A new and interesting technique to control proton beam characteristics has been recently developed. It consists in using an ultrafast laser-triggered micro-lens, which provides simultaneous energy selection and focusing of the incoming ion beam and is tunable. Particle-in-cell simulations coupled with particle tracing are used to model the focusing and energy selection mechanisms, and to study the symmetry of the expanding plasma inside the micro-lens. The model developed is able to reproduce and explain the experimental results obtained at the Laboratoire pour l'Utilisation des Lasers Intenses in France.
© 2007 Chinese Optics Letters
Emmanuel d'Humieres, Julien Fuchs, Toma Toncian, Patrizio Antici, Patrick Audebert, Marco Borghesi, Erik Brambrink, Carlo Alberto Cecchetti, Erik Lefebvre, Patrick Mora, Ariane Pipahl, Lorenzo Romagnani, Yasuhiko Sentoku, and Oswald Willi, "Generation of quasi-monoenergetic ion beams using short and intense laser pulses," Chin. Opt. Lett. 5, S136-S138 (2007)