CAST - A CERN Experiment to Search for Solar Axions

The CAST experiment at CERN is the only running solar axion telescope. The first results obtained so far with CAST — PHASE I is presented, which compete with the best astrophysically derived limits of the axion‐to‐photon coupling. The ongoing PHASE II of the experiment as well as the scheduled upgrades, which improve the axion discovery potential of CAST, are discussed.