Simulation of the channeling effect and its application for the LHC collimation system

The paper is devoted to simulation studies of single passage of protons at the LHC energy through the crystal. The two different codes are compared CRYAPR and CRYSTALchanneling. The differences of them for the simulation of channeling, dechanneling, volume reflection, volume capture, coulomb and nuclear scattering, miscut angle, ionization and diffractive energy losses are analyzed as far as the possible influence to the LHC collimation efficiency.