HF GFlash

We have developed HF GFlash, a very fast simulation of electromagnetic showers using parameterizations of the profiles in Hadronic Forward Calorimeter. HF GFlash has good agreement to 7 TeV Collision Data and previous Test Beam results. In addition to good agreement to Data and previous Test Beam results, HF GFlash can simulate about 10000 times faster than Geant4.