FIELD: accelerators, in particular, gathering information about characteristics of particles in beams. SUBSTANCE: device has coaxial slot aperture and aperture with multiple holes. Apertures are connected to rotation drives and fixers of angular position. In addition device has shutter of central hole, which may be shaped as Geneva wheel and is designed for periodic opening and closing central hole in aperture with multiple hole which axes are located with equal step along Archimedean spiral. Second aperture has ridges. EFFECT: increased functional capabilities. 2 cl, 4 dwg
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