Polycapillary X-ray Microbeams

As known, Kumakhov optics, or polycapillary optics, is based on the effective passage of X-ray radiation through the bundles of monocapillaries of various configurations; the latter takes place due to the phenomenon of total external reflection of X-rays from the inner capillary walls. In our work the basic characteristics of intense quasi-parallel X-ray polycapillary microbeams from a laboratory source in a scheme of microfocus X-ray tube/polycapillary structure, are investigated theoretically as well as experimentally. Experimental studies are carried out by means of a special automated stand. The received experimental data are compared with the results of computer statistical modeling. Modeling includes of the several theoretical models for various types of deviations of a reflection surface from ideal such as the roughness, waviness and bending. The effect of decrease of full divergence of microbeams near the exit end face of polycapillary system (quasi-decrease of divergence) is found out. But, unlike the observable effects of decrease of local divergence, proposed and discovered in works of Dabagov et al. and described on the base of surface channeling, the given effect can be well enough described within the lit-nits of geometrical optics. Now oil the base of Kumakhov optics at the Institute for Roentgen Optics the new generation of devices is developed and created: "daboratory synchrotron", fluorescent spectrometers, reflectometers, diffractometers, X-ray microscopes and combinations of several devices in one.