The Cherenkov Array at Themis (CAT) was an imaging atmospheric Cherenkov telescope (IACT) for detection of very-high-energy gamma rays (~200 GeV to a few tens of TeV). The project started operation in Autumn 1996 on the site of the former solar plant Thémis, France.
References
External links Cherenkov Array at Themis (CAT) on the internet Télescope de l'expérience CAT (Cerenkov array at Themis) sur le site de la centrale solaire THEMIS — photo of CAT CAT at INSPIRE-HEP database