Study on the efficiency of particle turn in bended monocrystals

The paper deals with particle movement (particularly, protons) in bended crystals. It is shown that for effective direction bend of the ultrarelativistic particle movement to a large angle it is necessary to provide rigid requirements of beam monochromaticity and crystal parameters. The most essential results of the conducted consideration are as follows: a) it is shown that the barrier penetration differing from zero created by a crystallographical plane results in essential increase of the minimal radius of the crystal bend at which the particle is captured in the channel and increase of particle angular spread at the crystal outlet; b) the probability of the beam movement direction bend to a certain angle depending on the degree of monochromaticity of the incident beam and the crystal bend radius is revealed; c) it is shown that scattering on the defects appearing during the crystal bend results in dechanneling and essential decrease of the probability of the bend at a certain angle