[en] A method to determine the direction of gamma-quanta beam at E_γ >100 MeV by detecting electron-positron pairs formed by gamma-quanta in the working substance is described. To increase the determination accuracy of gamma-quanta beam direction monocrystal is used as the working substance. The method suggested comprises the following procedures: determination of angular dependence of monocrystal detecting efficiency, scanning of monocrystal crystallographic axis in the given range of angles, measurement of the dependence of counting rate of electron-positron pairs on crystallographic axis position. The direction of gamma-beams is determined by comparing the counting rate dependence with angular dependence of monocrystal detecting efficiency and by establishing the shift of one dependence as to the other

[en] Method of tungsten monocrystal target orientation in a beam of labelled γ-quanta of electron synchrotron is described. Using Laue method the necessary crystal axis in X-ray beam was ''fixed'' to geomerical axis perpendicular to target surface, that in its turn by laser or self-collimation theodolite, orienting γ-quanta beam, made the necessary angles with a beam. The method accuracy is approximately 10' and is mainly due to accuracy of crystal orientation in X-ray facility

No abstract available

No abstract available

[en] A program of investigations into the quantum electrodynamics processes in the intense fields of oriented crystals is realized at the IHEP experimental 'Kaskad' facility. An orientation effect which can have a very interesting application and be, in particular, applied for determining the position of γ-quanta source in space is detected in crystals when studying the mechanism of electromagnetic shower development in crystals. A gamma-telescope design with crystalline converter is proposed. The estimations performed show that with 0.25 m² dimensions and about 300 kg mass the telescope should have an angular resolution which is by about an order better than in the existing gamma-telescopes. 2 refs

No abstract available

No abstract available

[en] The position of a source of γ-quanta with energies approx-gt 1 GeV can be determined using a crystal converter by recording the charged component of the shower that develops in a crystal. The method can be applied in gamma astronomy to produce crystal gamma telescopes

[en] A beam of polarized γ-quanta is produced and its polarization degree is measured. The experiment is conducted using an electron beam of the Serpukhov accelerator at the 'Kaskad' facility. 28 GeV energy electrons are recorded in a proportional chamber after which they enter a 15 mm thickness silicon crystal. After passing the second proportional chamber the electrons get into complete absorption spectrometer where their energy is measured, and the emitted gamma quanta get to 30 mm thickness silicon crystal. E⁺e^--pair coordinates are measured in the third proportional chamber. Gamma-quantum polarization value of 0.3±0.1 is obtained. 1 ref.; 1 fig