ShowerModel: A Python package for modelling cosmic-rayshowers, their light production and their detection

Morcuende, Daniel; Rosado, Jaime

doi:10.48550/arxiv.2103.00578

Cited by 1 publication

(1 citation statement)

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“…Commonly used analytical functions for the longitudinal number of charged particles in an EAS are the Greisen [7] or Gaisser-Hillas [8] function and for the lateral distribution the Nishimura-Kamata-Greisen function [9]. The former mentioned functions together with parametrizations of fluorescence and Cherenkov light emission [10] have been used in ShowerModel [11,12] to simulate the light emission in EAS and its detection by IACTs. While parametrizations tend to miss the fluctuations in the shower development, this is less of a problem at higher primary particle energies.…”

Section: Jinst 18 P08018mentioning

confidence: 99%

EASpy: fast simulation of fluorescence and Cherenkov light from extended air showers at large zenith angles

Baktash,

Horns

2023

J. Inst.

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The detailed simulation of extended air showers (EAS) and their emission of Cherenkov and fluorescence light requires increasing computation time and storage volume with increasing energy of the primary particle. Given these limitations, it is currently challenging to optimize configurations of imaging air Cherenkov telescopes at photon energies beyond approximately 100 TeV. Additionally, the existing simulation frameworks are not capable of capturing the interplay of Cherenkov and fluorescence light emission at large zenith angle distances (≳ 70°), where the collection area of Cherenkov telescopes considerably increases. Here, we present EASpy, a framework for the simulation of EAS at large zenith angles using parametrizations for electron-positron distributions. Our proposed approach for the emission of fluorescence and Cherenkov light and the subsequent imaging of these components by Imaging Atmospheric Cherenkov Telescopes (IACTs) aims to provide flexibility and accuracy while at the same time it reduces the computation time considerably compared to full Monte Carlo simulations. We find excellent agreement of the resulting Cherenkov images when comparing results obtained from EASpy with the de-facto standard simulation tool CORSIKA and sim_telarray. In the process of verifying our approach, we have found that air shower images appear wider and longer with increasing impact distance at large zenith angles, an effect that has previously not been noted. We also investigate the distribution of light on the ground for fluorescence and Cherenkov emission and highlight their key differences to distributions at moderate zenith angles.

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