Control of Energy Spread and Dark Current in Proton and Ion Beams Generated in High-Contrast Laser Solid Interactions

Dollar, F. and Matsuoka, T. and Petrov, G. M. and Thomas, A. G. R. and Bulanov, S. S. and Chvykov, V. and Davis, J. and Kalinchenko, G. and McGuffey, C. and Willingale, L. and Yanovsky, V. and Maksimchuk, A. and Krushelnick, K. (2011) Control of Energy Spread and Dark Current in Proton and Ion Beams Generated in High-Contrast Laser Solid Interactions. Physical review letters, 107 (6). ISSN 1079-7114

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Abstract

By using temporal pulse shaping of high-contrast, short pulse laser interactions with solid density targets at intensities of 2 x 10(21) W cm(-2) at a 45 degrees incident angle, we show that it is possible to reproducibly generate quasimonoenergetic proton and ion energy spectra. The presence of a short pulse prepulse 33 ps prior to the main pulse produced proton spectra with an energy spread between 25% and 60% (Delta E/E) with energy of several MeV, with light ions becoming quasimonoenergetic for 50 nm targets. When the prepulse was removed, the energy spectra was broad. Numerical simulations suggest that expansion of the rear-side contaminant layer allowed for density conditions that prevented the protons from being screened from the sheath field, thus providing a low energy cutoff in the observed spectra normal to the target surface.

Item Type: Journal Article
Journal or Publication Title: Physical review letters
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 79669
Deposited By: ep_importer_pure
Deposited On: 20 May 2016 10:12
Refereed?: Yes
Published?: Published
Last Modified: 01 Jan 2020 09:45
URI: https://eprints.lancs.ac.uk/id/eprint/79669

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