[en] A qualitative picture is considered and approximated formulas are obtained to evaluate the degree of magnetic field pulsation attenuation in deflecting magnets of charged particle accelerators. Typical dipole magnets, used in high-energy particle transport channels are investigated. On the basis of nUmerical solution of the problem it is shown that at the 50-300 Hz frequencies the eddy currents in the magnetic circuits can attenuate field pulsations in the magnet apertures from 2-3 to several dozens times depending on parameters and operation regime of the magnets. The main contribution to pulsation suppression is made by the effect of magnetic flux replacement from the magnetic circuit at the portion beyond the poles. 1.5 to 2-flold attenuation is ensured by exponential drop in the variable field from the gap edges to the centre. It is possible to attain a higher suppression of pulsations, using a short-circuited conducting loop of nonferromagnetic material, enveloping the working gap. A good suppression of field pulsations in the aperture is attained in the case when irs,.ead of placing the loop in the gap the winding is enclosed into a screen completely. Comparison of the eval uations obtained with the results of measurements of magnetic field culsation coefficient under different conditions has shown their good agreement

[en] Capillar roentgenoptical systems, developed at the IAEh after I.V. Kurchatov, enabling ordered control of X-ray radiation propagation, is described. Good agreement of calculational and real losses by beam transport within the range of 0.5-40 keV is indicated. Polycapillar X-ray guides with regulatory short-wave boundary are proposed

[en] A possibility is studied to ensure high field stability in magneto-optical elements of charged particle accelerator channels using special shields. In particular, special conducting ionguides situated in the aperture may serve as such shields. The effects to be considered in requirements to be met by the power sources of magneto-optical systems are analyzed. The qualitative picture of the process is considered, and approximate formular for estimation of the field pulsation attenuation degree in beam bending magnets are derived. The conducted comparison of these estimations with the esperiment shows their good agreement. It is shown that at 450-300 Hz the eddy currents in the magnetic circuits attenuate field pulsations in the magneto-optic element apetures from 2-3 times to several dosens times depending on the parameters and operation conditions of particular devices. Utilization of the simplest conducting shields provides for attenuation of field pulsations as much as hundreds and thousands times

[en] Multifiber polycapillary optics have been used for guiding and focusing neutron beams based on the principle of total external reflection. A recent development involving the miniaturization of such neutron focusing lenses has produced monolithic bundles of tapered capillaries with higher fractional open area and smaller focal spot size compared to the previous generations of devices containing many polycapillary fibers. This paper presents experimental characterizations of two monolithic lenses using a cold neutron beam from a research reactor. (author)

[en] A method for focusing X-rays by means of internal reflection inside hollow glass capillaries has also been shown to be capable of guiding a neutron beam, and now a neutron lens using this principle has been demonstrated. Here we study the properties of multiple capillary fibre bundles by measuring the transmission efficiency as a function of bending radius. The fibres used are shown to bend a neutron beam through 20^o in a distance of 130 mm, with a transmission of 50%. A simple device made of a few fibres is used to demonstrate the focusing of cold neutrons (wavelength 0.2-0.9 nm) down to a 1-mm² spot size. These investigations will form the basis for the design of a neutron lens for use in materials research, or a beam bender capable of dividing and directing a neutron beam towards several experimental stations. (Author)