Geant4 is a toolkit for the simulation of particles passing through and interacting with matter. Its areas of application include high energy, nuclear and accelerator physics, as well as studies in medical and space science. Geant4 is developed and maintained by the international Geant4 Collaboration. Members of the SLAC Geant4 team have been actively participating in the Geant4 collaboration since its beginning, and currently take leading roles in several key areas of the collaboration. SLAC Geant4 members made significant contributions in simulation development for the BaBar experiment at SLAC, which pioneered the use of Geant4 in the simulation of high energy physics experiments. Currently Geant4 is extensively used by SLAC experiments including:

• ATLAS
• BaBar
• Cryogenic Dark Matter Search (CDMS)
• Enriched Xenon Observatory (EXO)
• Fermi Gamma-ray Space Telescope
• International Linear Collider
• Large Synoptic Survey Telescope (LSST)
• Channeling Studies of High-Energy Electrons in Crystals (T-513)

Since October 2019, as DOE Office of High Energy Physics stopped funding SLAC for Geant4 general development and user-support, all of our user support is offered in contract basis. Please contact us for any needs.