Abstract：
:Laser-driven ion acceleration is often analyzed assuming that ionization reaches a steady state early in the interaction of the laser pulse with the target. This assumption breaks down for materials of high atomic number for which the ionization occurs concurrently with the acceleration process. Using particle-in-cell simulations, we have examined acceleration and simultaneous field ionization of copper ions in ultra-thin targets (20-150 nm thick) irradiated by a laser pulse with intensity 1 × 1021 W/cm2. At this intensity, the laser pulse drives strong electric fields at the rear side of the target that can ionize Cu to charge states with valence L-shell or full K-shell. The highly-charged ions are produced only in a very localized region due to a significant gap between the M- and L-shells' ionization potentials and can be accelerated by strong, forward-directed sections of the field. Such an "ionization injection" leads to well-pronounced bunches of energetic, highly-charged ions. We also find that for the thinnest target (20 nm) a push by the laser further increases the ion energy gain. Thus, the field ionization, concurrent with the acceleration, offers a promising mechanism for the production of energetic, high-charge ion bunches.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Li J,Arefiev AV,Bulanov SS,Kawahito D,Bailly-Grandvaux M,Petrov GM,McGuffey C,Beg FNdoi
10.1038/s41598-018-37085-6subject
Has Abstractpub_date
2019-01-24 00:00:00pages
666issue
1issn
2045-2322pii
10.1038/s41598-018-37085-6journal_volume
9pub_type
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