Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CRPropa - A Toolbox for Cosmic Ray Simulations   The astrophysical interpretation of recent experimental observations of
cosmic rays relies increasingly on Monte Carlo simulations of cosmic ray
propagation and acceleration. Depending on the energy range of interest,
several different propagation effects inside the Milky Way as well as in
extragalactic space have to be taken into account when interpreting the data.
With the CRPropa framework we aim to provide a toolbox for according
simulations. In recent versions of CRPropa, the ballistic single particle
propagation mode aiming primarily at extragalactic cosmic rays has been
complemented by a solver for the differential transport equation to address
propagation of galactic cosmic rays. Additionally, modules have been developed
to address cosmic ray acceleration and many improvements have been added for
simulations of electromagnetic secondaries. In this contribution we will give
an overview of the CRPropa simulation framework with a focus on the latest
improvements and highlight selected features by example applications.

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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph