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Krijn de Vries, Vrije Universiteit Brussel, Belgium
In this seminar, the radar echo technique to probe high-energy particle cascades is discussed. Starting with a historical overview of early efforts to probe cosmic-ray air showers, we shift to the detection of particle cascades in more dense media with a focus on in-ice cascades. The radar scattering process and expected signal features are introduced, after which we focus on recent and upcoming experimental efforts to detect particle cascades in dense media. We discuss the positive detection of a radar signal at the SLAC T-576 experiment, which lead to the formation of the Radar Echo Telescope (RET) collaboration. Within this collaboration the RET-CR experiment aims to show the in-situ proof-of-principle of the radar echo method by detecting the in-ice core of a high-energy cosmic-ray air shower penetrating a high-altitude ice sheet. Its current status and foreseen deployment will be presented. Finally we discuss the radar method to probe cosmic neutrinos in the > PeV energy range, which will be the main target of the RET-N experiment.