Abstract
The experimentally measured yields of X-rays generated by 500-MeV electrons (the X-ray energies are ω ∼ γωp) in oriented tungsten single crystals are analyzed. A series of experiments have been performed at the Tomsk synchrotron with the use of crystal-diffraction spectrometers based on mosaic pyrolytic graphite crystals. The measured results are shown to be explained by competition between parametric X-radiation and bremsstrahlung diffraction in mosaic crystals of the aα class. The characteristic sizes of microblocks of refractory metal crystals are discussed from the standpoint of their influence on the positron yield in designed positron sources. A method for determining the characteristic sizes of microblocks in mosaic crystals of the aα class is proposed.
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