Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Laser-Ion Lens and Accelerator   Generation of highly collimated monoenergetic relativistic ion beams is one
of the most challenging and promising areas in ultra-intense laser-matter
interactions because of the numerous scientific and technological applications
that require such beams. We address this challenge by introducing the concept
of laser-ion lensing and acceleration (LILA). Using a simple analogy with a
gradient-index lens, we demonstrate that simultaneous focusing and acceleration
of ions is accomplished by illuminating a shaped solid-density target by an
intense laser pulse at ~10^22 W/cm^2 intensity, and using radiation pressure of
the laser to deform/focus the target into a cubic micron spot. We show that the
LILA process can be approximated using a simple deformable mirror model, and
then validate it using three-dimensional particle-in-cell simulations of a
two-species plasma target comprised of electrons and ions. Extensive scans of
the laser and target parameters identify the stable propagation regime where
the Rayleigh-Taylor (RT)-like instability is suppressed. Stable focusing are
found at different laser powers (from few- to multi-petawatt). Focused ion
beams with the focused density of order 10^23 cm^-3, energies in access of
750MeV, and energy density up to 2*10^13 J/cm^3 at the focal point are
predicted for future multi-petawatt laser systems.

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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio