FIELD: engineering physics; radiation focusing lenses. SUBSTANCE: radiation is, essentially, beam of charged particles, gamma- or X-ray photons, neutrons, ultraviolet or infrared rays. Lens has set of radiation transport channels using total repeated outer reflection. Channels are curved over generating line of barrel-shaped surfaces and positioned so that input ends of each of them can capture radiation of source being used. Proportion between cross- sectional areas and curvature radius is chosen proceeding from condition that rays partially fill up cross-sectional area of their output ends. The latter are oriented to single point with ten lines lying in center between extreme points of portions of their cross-sectional area filled with rays. Points are located on symmetry axis of these portions. Radiation transport channels are located only in part of lens cross-sectional area. This part is peripheral relative to optical axis of lens. Lens part adjacent to optical axis is impermeable for mentioned radiation. EFFECT: reduced size of lens-formed focal spot and of lens, reduced aberrations involving longitudinal smearing of focal spot. 5 dwg
