No abstract available

[en] A device for measuring the profile and position of a charged particle beam, comprising an ionization chamber with parallel measuring and high-voltage electrodes, is suggested. The purpose of the invention is to improve the spatial resolution of the device. This purpose is attained in that the measuring electrode is in the form of a filament movable in the plane normal to the beam. Behind the filament, in the direction of the beam and parallel to the chamber electrodes, an additional electrode is placed whose potential should be close to that of the measuring electrode. The suggested device enables one to obtain non-discrete data on the beam

[en] To increase the acceptance of accelerating focusing channel of the LU-2 GeV linear accelerator, magnetic quadrupole lense with the aperture of 150 mm is prepared. This aperture permits to establish the lense in any place of accelerator, as well as directly on the case of accelerating section. The design is described, technical characteristics of the lense are given. Magnetic characteristics and harmonic composition of magnetic field of the lense are measured. The gradient of the magnetic field remains stable in the limits of 0.7 radius of the aperture and constitutes 0.9 Tl/m. The effective lense length is 356/nm with the geometrical length of 310 mm. The contribution of harmonics of higher orders in the limits of really used aperture part proves to be insignificant. The discrepance of magnetic and geometrical axes does not increase 0.5 mm

[en] Main factors which affect the lateral dimensions of an electron beam with an energy of 300 MeV focussed by a quadrupole lenses doublet are analyzed. Basic requirements for focusing system parameters are stated. It is shown that under these conditions a beam with a cross-section area of 4 mm² can be produced. Results of an experimental investigation of the system during which a beam with a density of 36 μA/mm² current has been produced are presented. Some aspects of measuring the profile of a high-density beam are considered

No abstract available

No abstract available

[en] The EMITRA-program for simulation of electron (positron) beam dynamics in linear accelerators and transport systems is described. The program is written in FORTRAN for BESM-6 computer, the graphic program complex GRAFOR is used. The program algorithm is considered. The simulation is based on trajectory method. The interconnection between particle energy and phase is taken into account, which is due to nonisochronous character of particle trajectory as well as its slippage relative to the accelerating wave. Calculation results may be printed out in the form of tables or graphs. The instruction on usage and a simulation example for the channel containing specific elements of the linear accelerator: drift graphs, quadrupole lenses, accelerating sections with and without solenoid are given

[en] The origination of texture in molubdenum layers produced by inclined molecular beams upon the substrates of Al₂O₃ and Mo₂C has been investigated. It has been shown that the high intensity of the confined texture in the coating arises form a crystallographic rotation of its plane. We have proven experimentally an essentially new mechanism of formation of the confined textures, the ''seeding-out'' mechanism, that is, the formation of confined textures by rejecting all orientations but one

No abstract available

[en] Some up-dated features of the 2 GeV linac systems, changes in beam parameters and new operating modes are described. The beam absorber design and biological shielding are modernized; a new injector with a removable source is installed; the synchronization system allowing to realize the operating mode at two frequencies of 100 and 50 Hz simultaneoUsly is up-dated; the waveguide line seals are replaced. Using the modernized units the 53 mA pulse current is obtained at the accelerator output at 1450 MeV energy and 1.6 μs pulse duration. In view of expanding the scope of experiments on physics of crystals a new mode with low divergence and intensity Up to (1-2)x10^-10 A is worked out. The reliability facrors and effective accelerator time are presented