ICRC2023 author list (preliminary):

As of now identically to the 2021 one, this might change https://gitlab.iap.kit.edu/AirShowerPhysics/corsika/-/wikis/CORSIKA-Talks/ICRC2021-author-list

ICRC2023 talks:

Nikolaos Karastathis

Simulating radio emission from air showers with CORSIKA 8

CORSIKA 8 is a new framework for air shower simulations implemented in modern C++17, based on past experience with existing codes like CORSIKA 7. The flexible and modular structure of the project allows the development of independent modules that can produce a fully customizable air shower simulation. The radio module in particular is designed to treat the signal propagation and electric field calculation to each antenna in an autonomous and flexible way. It provides the possibility to simulate simultaneously the radio emission calculated with two independent time-domain formalisms, the “Endpoint formalism” as implemented in CoREAS and the “ZHS” algorithm as ported from ZHAireS. Future development for the simulation of radio emission from particle showers in complex scenarios, for example cross-media showers penetrating from air into ice, can build on the existing radio module, re-using the established interfaces. In this work, we will present the design and implementation of the radio module in CORSIKA 8, and show a direct comparison of radio emission from air showers simulated with CORSIKA 8, CORSIKA 7 and ZHAireS.

Tim Huege

The particle-shower simulation code CORSIKA 8

https://www.overleaf.com/4758124133nqjdgmcxjwkj

CORSIKA up to version 7 has been the most-used Monte Carlo code for simulating extensive air showers for more than 20 years. Due to its monolithic, Fortran-based software design and hand-optimized code, however, it has become difficult to maintain, adapt to new computing paradigms and extend for more complex simulation needs. These limitations led to the CORSIKA 8 project, which constitutes a complete rewrite of the CORSIKA 7 core functionality in a modern, modular C++ framework. CORSIKA 8 has now reached a state that we consider ``physics-complete''. It already supports the treatment of hadronic interactions with SIBYLL 2.3d, QGSJETII-04, EPOS-LHC and PYTHIA 8.3 and the treatment of the electromagnetic cascade with PROPOSAL 7.6. Particular highlights are multi-interaction-media support, including cross-media particle showers, and an advanced calculation of the radio emission from particle showers. CORSIKA 8 has also reached a stability that already allows experts to engage in development for specific applications. In this contribution, we discuss the design principles of CORSIKA 8, give an overview of the functionality implemented to date, the validation of its simulation results, and the plans for its further development.

Dominik Baack

Comparison and efficiency of GPU accelerated optical light propagation in CORSIKA8

https://www.overleaf.com/read/qpyjpjwstfcy

AI accelerators have proliferated in data centres in recent years and are now almost ubiquitous. In addition, their computational power and, most importantly, their energy efficiency are up to orders of magnitude higher than that of traditional computing. In recent years, various methods and optimisations have been tested to use these hybrid systems for simulations in the context of astroparticle physics.

The main focus of this talk is the propagation of optical, i.e. flourescence and Cherenkov, photons through thin inhomogeneous media. Different techniques used and approximations, e.g. the atmospheric model, tested during the development will be presented. The trade-off between performance and precision allows the experiment to achieve its physical precision limited to the real resolution of the experiment and not invest power and time and vanishing precision gains. The additional comparison of classical CPU-based simulations with the new methods validates these methods and allows evaluation against a known baseline.

Juan Ammerman

Simulations of cross media showers with CORSIKA 8

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.

Alexander Sandrock, Jean-Marco Alameddine, and Felix Riehn for the CORSIKA 8 collaboration

Validation of Electromagnetic Showers in CORSIKA 8

The air shower simulation code CORSIKA has served as a key part of the simulation chain for numerous astroparticle physics experiments over the decades. Due to retirement of the original developers and the increasingly difficult maintenance of the monolithic Fortran code of CORSIKA, a new air shower simulation framework has been developed over the course of the last years in C++, called CORSIKA 8.

Besides the hadronic and muonic component, the electromagnetic component is one of the key constituents of an air shower. The cascade producing the electromagnetic component of an air shower is driven by bremsstrahlung and photoproduction of electron-positron pairs. At ultrahigh energies or large densities, the bremsstrahlung and pair production processes are suppressed by the Landau-Pomeranchuk-Migdal (LPM) effect, which leads to more elongated showers compared to showers without the LPM suppression. Furthermore, photons at higher energies can produce muon pairs or interact hadronically with nucleons in the target medium, producing a muon component in electromagnetic air showers.

In this contribution, we compare electromagnetic showers simulated with the latest Fortran version of CORSIKA and CORSIKA 8. While earlier validations of CORSIKA 8 electromagnetic showers focused on showers of lower energy, the recent implementation of the LPM effect, photo pair production of muons, and of photohadronic interactions allows now to make a physics-complete comparison also at high energies.