[en] A system for generating and injecting solid-hydrogen pellets is described and was used to generate solid-hydrogen pellets in a three-barrel injector. The injector is based on using a free-flow heat-exchanger. The authors obtained stable thermal operation which generates hydrogen pellets with uniform physical properties. The system produces a train of three pellets each of which contains (2-5) x 10¹⁹ hydrogen molecules and travels at 700-900 m/sec

[en] Short communication

[en] System for formation and injection of solid-state hydrogen pellets for thermonuclear facilities is described. Results of formation of hydrogen pellets in the three-barrel injector which operation is based on application of flow-type heat exchanger are presented. The stable thermal conditions for formation of hydrogen pellets with homogeneous physical properties are obtained. The system allows to carry out cosecutive injection of three pellets with (2-5)x10¹⁹ hydrogen molecule content at 700-900 m/s rate

[en] The discharge parameters and vacuum regimes of the two-stage gas-metal plasma source are presented for three configurations of magnetic field. Distributions of deposited flows, current and voltage characteristics of the discharge, current characteristics for reflective electrodes and target are presented. Discharge voltage is 30...150 V, discharge current is up to 25 A. The gas discharge is initiated on air. Vapors of copper were used for discharges in metal. The evaporation rates of copper are obtained at the level of 20...30 g/h. The results of study have shown that mass distribution of flows deposited on the vacuum chamber walls significant deviated from Knudsen-Lamberg law described of evaporation in vacuum.

[en] This scientific paper deals with the project related to the gas-metal plasma source design. It describes the structure and electric power supply circuit. The consideration has been given to a possibility of the use of this source for the separation technology, in particular for the reprocessing of spent nuclear fuel (SNF). The requirements set to the source and parameters of the generated plasma have been devised. The efficiency of magnetoplasma reprocessing of SNF has been evaluated and the selection of metals and their oxides as the simulation media for the experiments carried out to reprocess spent nuclear fuel have been substantiated.

[en] The results of experimental studies of plasma formed at electric arc impact on a powder of CaCO₃ (natural and purified oxides). It was shown that the presence of impurities in natural CaCO₃ leads to an increase in the discharge currents necessary to produce Ca⁺ ions more than twice. The analysis of the plasma emission spectrum for purified CaCO₃ showed at discharge power increasing the increase of plasma ionization degree and increase in the concentration of single-charged calcium ions due to the dissociation and ionization of molecular components.

[en] The results of the researches of cylindrical plasma, rotated in the crossed electric and magnetic fields are considered. Calculations and experiments have showed that at certain correlations of the electric and magnetic fields heating and separation of ions of different sorts is possible due to power supply of radial electric-field system.

[en] An experimental study of the influence of HF power and configuration of the magnetic field on the plasma parameters of the gas source with incandescent cathode was carried out. It is shown that the application HF power into discharge results in reduction of electron temperature. For discharge in decreasing magnetic field the radial distribution of the plasma density in the axial region is more uniform compared with increasing magnetic field.

[en] Possible composition of spent nuclear fuel (SNF) before and after the thermal separation stage is shown. The possibility of SNF purification from fission products (FP) at the ionization stage is analyzed. Trajectories of charged particles - molecular ions, FP and nuclear fuel, remained in SNF, at magnetoplasma separation stage are calculated

[en] At present the recycling of nuclear fuel (NF), i.e. its reuse, is implemented by using Purex-process. However, it leads to increase of liquid radioactive waste (RW) volume, while the alternative methods of physical reprocessing, in particular plasma ones, do not require chemical reagents but use only electrical power. In NSC KIPT it is offered the magnetoplasma reprocessing of spent nuclear fuel (SNF), which includes three stages (heating, ionization, magnetoplasma separation in rotating plasma), on which fission products (FP) are consistently separated from NF. Herewith the simulation of SNF separation should carry out in multicomponent molecular medium. The problems connected with possible presence of complex compounds in SNF and possible ways of their solving are presented.