  Electromagnetic processes of charged particles interaction with oriented
crystals provide a wide variety of innovative applications such as beam
steering, crystal-based extraction/collimation of leptons and hadrons in an
accelerator, a fixed-target experiment on magnetic and electric dipole moment
measurement, X-ray and gamma radiation source for radiotherapy and nuclear
physics and a positron source for lepton and muon colliders, a compact
crystalline calorimeter as well as plasma acceleration in the crystal media.
One of the main challenges is to develop an up-to-date, universal and fast
simulation tool to simulate these applications.
  We present a new simulation model of electromagnetic processes in oriented
crystals implemented into Geant4, which is a toolkit for the simulation of the
passage of particles through matter. We validate the model with the
experimental data as well as discuss the advantages and perspectives of this
model for the applications of oriented crystals mentioned above.
