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### Simulations of cross media showers with CORSIKA 8
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The Corsika 8 project aims to develop a versatile and modern framework for particle shower simulations that meets the new needs of experiments and addresses the caveats of existing codes. One of these is the ability to compute particle showers that pass through two or more different media, of varying density, in a single run within a single code. Corsika 8 overcomes this limitation by using a volume tree that specifies volume containment, allowing one to quickly query to which medium a point belongs. Thanks to this design we are able to construct very specific environments with different geometries and mediums. As an example, we demonstrate this new functionality by running air showers intersecting Antarctic ice. The results obtained from these runs are then validated with simulations of the well-established Corsika 7 and Geant 4 codes. |
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The Corsika 8 project aims to develop a versatile and modern framework for particle shower simulations that meets the new needs of experiments and addresses the caveats of existing codes. One of these is the ability to compute particle showers that pass through two or more different media, of varying density, in a single run within a single code. Corsika 8 overcomes this limitation by using a volume tree that specifies volume containment, allowing one to quickly query to which medium a point belongs. Thanks to this design we are able to construct very specific environments with different geometries and mediums. As an example, we demonstrate this new functionality by running air showers intersecting Antarctic ice. The results obtained from these runs are then validated with simulations of the well-established Corsika 7 and Geant 4 codes.
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## Alexander Sandrock, Jean-Marco Alameddine, and Felix Riehn for the CORSIKA 8 collaboration
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### Validation of Electromagnetic Showers in CORSIKA 8
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The air shower simulation code CORSIKA has served as a key
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part of the simulation chain for numerous astroparticle physics
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experiments over the decades. Due to retirement of the original
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developers and the increasingly difficult maintenance of the monolithic
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Fortran code of CORSIKA, a new air shower simulation framework has been
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developed over the course of the last years in C++, called CORSIKA 8.
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Besides the hadronic and muonic component, the electromagnetic component
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is one of the key constituents of an air shower. The cascade producing
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the electromagnetic component of an air shower is driven by
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bremsstrahlung and photoproduction of electron-positron pairs. At
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ultrahigh energies or large densities, the bremsstrahlung and pair
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production processes are suppressed by the Landau-Pomeranchuk-Migdal
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(LPM) effect, which leads to more elongated showers compared to showers
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without the LPM suppression. Furthermore, photons at higher energies can
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produce muon pairs or interact hadronically with nucleons in the target
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medium, producing a muon component in electromagnetic air showers.
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In this contribution, we compare electromagnetic showers simulated with
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the latest Fortran version of CORSIKA and CORSIKA 8. While earlier
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validations of CORSIKA 8 electromagnetic showers focused on showers of
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lower energy, the recent implementation of the LPM effect, photo pair
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production of muons, and of photohadronic interactions allows now to
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make a physics-complete comparison also at high energies. |
