Crystalline wigglers

It is proposed to use a stack of thin crystalline plates the crystallographic planes of which make the “periodical channels” necessary for oscillatory motion of the channeled positively charged relativistic particles. Coming out from the previous plate the particles can be bent and captured into channeling mode in the next one or in a few plates. The channeled particles besides the harder channeling radiation in the plates generate wiggler radiation. Compared with the magnetic wigglers the proposed small crystalline wigglers have smaller curvature radius due to the much stronger crystalline fields. Compared with the existing or proposed crystalline undulators the proposed devices have much simpler construction and larger acceptances.