The major application areas of Geant4 in NASA space missions include apparatus simulation (pre-launch design, post-launch analysis) for platforms such as Fermi LAT (Large Areas Telescope) and Cassini LEMMS (Low Energy Magnetospheric Measurement System); planetary scale simulation (radiation spectra) for missions such as THEMIS, LADEE and MAVEN; and micro-dosimetry simulation (single event effects). Other beneficiaries include Large-Scale Numerical Simulations that require control dependent loops.
Non-NASA users for a Geant4 SIMD DSL come from a range of diverse fields including Nuclear Physics, High-Energy Physics (e.g., BaBar, ATLAS, CMSSW/OSCAR, GAUSS, ALICE), and Medical (GAMOS, GATE, G4EMU, G4MED, G4NAMU). Medical applications include simulations for Radiology (CT/Proton, CT) and Radiotherapy (e.g., treatment plan verification, dose distribution calculations, and facilities planning).
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