Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 3: Near-Earth Space I

EP 3.6: Vortrag

Dienstag, 1. April 2025, 15:30–15:45, ZHG005

Simulations of the CHerenkov Atmospheric Observation System (CHAOS) — •Pierre Bornfleth, Hannes Ebeling, and Ava Pohley — Christian-Albrechts-Universität zu Kiel

The Earth is continuously exposed to high-energy charged particles, so-called Galactic Cosmic Rays (GCRs). When these particles hit the Earth’s atmosphere, they create a cascade of secondary particles. CHAOS uses a new detector design developed at the Department of Extraterrestrial Physics at Kiel University by a team of students to measure the different particle species of the primary GCRs above the so-called Regener-Pfotzer Maximum. To perform these measurements a combination of multiple solid state detectors and a bismuth germanium oxide (BGO) scintillator is used to measure the energy depositions of the particles. The use of an additional Cherenkov aerogel scintillator allows to separate between electrons and protons. Because electrons are much lighter than ions, electrons with energies above ∼ 1.1 MeV will trigger the Cherenkov detector whereas ions with the same energy are much slower and will not trigger the Cherenkov detector. CHAOS flew on a stratospheric balloon as part of the BEXUS program in early Oktober 2024. In this talk I present a comparison between simulations of the detector and the measurements of the flight to identify which particles were measured and what energy they had.

Keywords: Simulation; Particle Telescope; BEXUS; Galactic Cosmic Rays