  In this work we have observed x-ray emission from x-ray waveguide radiator
excited by relativistic electrons. The experiment carried out at Tomsk betatron
B-35. Such new type stratified target was mounted on goniometer head inside the
betatron toroid. The target is consisted of the W-C-W layers placed on Si
substrate. The photographs of the angular distributions of the radiation
generated in the target by 20-33 MeV electrons have shown the waveguide effect
of the three-layer structure on x-rays generated in the target. The effect
proved in an angular distribution of radiation as an additional narrow peak of
guided x-rays intensity inside a wide cone of usual Bremsstrahlung.
