Comparative analysis of radiation during channeling and in micro- and macroundulators

The comparison is made of the intensity of relativistic particles channeling radiation with that of the radiation in magnetic multidomain structures (microundulators) and in conventional macroundulators. The radiation in microundulators is shown to be negligible as compared both with channeling radiation and accompanying bremsstrahlung. It is also shown that in the ultraviolet range of frequencies microundulators are the most efficient sources of radiation. In the X-ray region of frequencies the radiation intensities in macroundulators and during the channeling are comparable, whereas in the harder region of frequencies the channeling radiation remains unrivaled. (author)