\chapter*{ABSTRACT}
The Earth is continuously exposed to high-energy charged particles, so-called \acfp{GCR}. When these particles hit the Earth's atmosphere, they create a cascade of secondary particles. The \ac{CHAOS} uses a new detector design developed by a team of students at the Department of Extraterrestrial Physics at Kiel University to measure the different particle species of the primary \acp{GCR} above the so-called Regener-Pfotzer Maximum. To perform these measurements a combination of multiple \acp{SSD} and a \ac{BGO} scintillator is used to measure the energy depositions of the particles. The use of an additional Cherenkov aerogel scintillator allows to separate between light and heavy particles, such as electrons and ions. Because electrons are much lighter than ions, electrons with energies above $\sim$\,1.1\,MeV will trigger the Cherenkov detector whereas ions with the same energy are much slower and will not trigger the Cherenkov detector. More information about \ac{CHAOS} can be found at our website \url{https://www.bexus.org/}.

% \color{red} The Cherenkov detector is triggered by particles moving faster than light in the medium, just like electrons with energies above $\sim$\,1.1\,MeV. Heavier ions of the same energy will move slower and won't trigger the detector.

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