Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: (py)LIon: a package for simulating trapped ion trajectories   The (py)LIon package is a set of tools to simulate the classical trajectories
of ensembles of ions in electrodynamic traps. Molecular dynamics simulations
are performed using LAMMPS, an efficient and feature-rich program. (py)LIon has
been validated by comparison with the analytic theory describing ion trap
dynamics. Notable features include GPU-accelerated force calculations, and
treating collections of ions as rigid bodies to enable investigations of the
rotational dynamics of large, mesoscopic charged particles.

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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph