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Abstract
The characteristics of particle radiation in different undulators are qualitatively compared. Features peculiar to particle radiation in crystals (natural undulators) are discussed. The effects of particle energy and initial entry conditions on particle oscillation frequency are considered. The effect of radiation friction and multiple scattering on the radiation parameters is investigated. The accuracy of a description of channelled electron emission by means of the averaged potential is checked. A criterion is suggested for checking the applicability of classic electrodynamics to a particle radiating in a crystal.