ATLAS Software Architecture
The Large Hadron Collider will create almost a billion proton-proton collisions per second at an energy of 14 trillion electron volts. These collisions will take place at four points around a 27-kilometer ring, where the
four main LHC experiments‚ ALICE, ATLAS, CMS and LHCb‚Äîare located. ATLAS is one of two general-purpose experiments designed to cover the largest possible range of LHC physics. The largest-volume detector
ever constructed, ATLAS is 148 feet long, 82 feet wide and 82 feet high, and weighs about 7,700 tons. ATLAS will generate ~5 PetaBytes of raw, processed, and simulated data per year over a lifetime of ~20
years. LBNL has leadership responsibility for ATLAS software architecture, core software, and in particular, the Athena framework. Athena is a component software framework based on the Gaudi architecture which
enables ATLAS researchers to cooperatively analyze the torrent of data expected while maintaining analysis flexibility critical to maximizing scientific discovery.