Generation of X-rays by 850 MeV electrons in a novel periodic multicrystalstructure on a GaAs plate surface

A novel type of a periodical crystalline target for the generation of coher ent X-rays by relativistic electrons is described. The target has been done on the surface of a GaAs crystal plate by means of microlitography. The et ched microstructure is a system of about 300 stripes 14 mu m thick, 100 mu m high and the gaps between the stripes are 29 mu m. The measured spectra a nd orientational dependences of the X-rays emitted at an angle of 19 degree s to the 850 MeV electron beam of the Tomsk synchrotron are discussed. The generated 63 keV radiation consists of parametric X-ray radiation (PXR) and diffracted X-ray transition radiation (DTR). It has been shown that the in tensity of the DTR component of the generated X-rays is much more great tha n that of the PXR. (C) 2000 Elsevier Science B.V. All rights reserved.