Speaker
Description
The CHerenkov Atmospheric Observation System (CHAOS) is a student-developed particle detector flown aboard the BEXUS 35 balloon mission as part of the REXUS/BEXUS programme to test alternative concepts in near-relativistic ion detection. The instrument combines energy-loss measurements (dE/dx–dE/dx) with a velocity threshold from an aerogel-based Cherenkov detector, enabling clean measurements of the energy spectra from a few 10-s MeV to above 1 GeV for protons and helium. During its successful flight on BEXUS 35 in 2024, CHAOS took data above the Regener–Pfotzer maximum and demonstrated its ability to resolve the charged particle spectrum in the stratosphere. This shows that such a compact instrument can characterise the energetic particle environment.
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