Ultrafast laser-driven microlens to focus and energy-select mega-electron volt protons |
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Authors: | Toncian Toma Borghesi Marco Fuchs Julien d'Humières Emmanuel Antici Patrizio Audebert Patrick Brambrink Erik Cecchetti Carlo Alberto Pipahl Ariane Romagnani Lorenzo Willi Oswald |
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Institution: | Heinrich Heine Universit?t Düsseldorf, D-40225 Düsseldorf, Germany. |
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Abstract: | We present a technique for simultaneous focusing and energy selection of high-current, mega-electron volt proton beams with the use of radial, transient electric fields (10(7) to 10(10) volts per meter) triggered on the inner walls of a hollow microcylinder by an intense subpicosecond laser pulse. Because of the transient nature of the focusing fields, the proposed method allows selection of a desired range out of the spectrum of the polyenergetic proton beam. This technique addresses current drawbacks of laser-accelerated proton beams, such as their broad spectrum and divergence at the source. |
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